/usr/share/doc/zsh-common/html/Completion-System.html is in zsh-doc 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Created by GNU Texinfo 6.0, http://www.gnu.org/software/texinfo/ -->
<head>
<title>zsh: 20 Completion System</title>
<meta name="description" content="zsh: 20 Completion System">
<meta name="keywords" content="zsh: 20 Completion System">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="texi2any">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smalllisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nocodebreak {white-space: nowrap}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: serif; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>
</head>
<body lang="en">
<a name="Completion-System"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="Completion-Widgets.html#Completion-Widgets" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Widgets.html#Completion-Widget-Example" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Description-3" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Completion-System-1"></a>
<h1 class="chapter">20 Completion System</h1>
<a name="index-completion-system"></a>
<a name="index-completion_002c-programmable-1"></a>
<a name="index-completion_002c-controlling-1"></a>
<hr>
<a name="Description-3"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Initialization" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<h2 class="section">20.1 Description</h2>
<p>This describes the shell code for the ‘new’ completion system, referred
to as <tt>compsys</tt>. It is written in shell functions based on the
features described in
the previous chapter, <a href="Completion-Widgets.html#Completion-Widgets">Completion Widgets</a>.
</p>
<p>The features are contextual, sensitive to the point at which completion is
started. Many completions are already provided.
For this reason, a user can perform a great many tasks without
knowing any details beyond how to initialize the system, which is
described
in <a href="#Initialization">Initialization</a>.
</p>
<p>The context that decides what completion is to be performed may be
</p><ul>
<li> an argument or option position: these describe the position on the
command line at which completion is requested. For example ‘first argument
to rmdir, the word being completed names a directory’;
</li><li> a special context, denoting an element in the shell’s syntax. For example
‘a word in command position’ or ‘an array subscript’.
</li></ul>
<p>A full context specification contains other elements, as we shall describe.
</p>
<p>Besides commands names and contexts, the system employs two more
concepts, <em>styles</em> and <em>tags</em>. These provide ways for the user
to configure the system’s behaviour.
</p>
<p>Tags play a dual role. They serve as a classification system for
the matches, typically indicating a class of object that the user
may need to distinguish. For example, when completing arguments of the
<tt>ls</tt> command the user may prefer to try <tt>files</tt> before <tt>directories</tt>,
so both of these are tags. They also appear as the rightmost
element in a context specification.
</p>
<p>Styles modify various operations of the completion system, such as
output formatting, but also what kinds of completers are used (and in
what order), or which tags are examined. Styles may accept arguments
and are manipulated using the <tt>zstyle</tt> command described in
<a href="Zsh-Modules.html#The-zsh_002fzutil-Module">The zsh/zutil Module</a>.
</p>
<p>In summary, tags describe <em>what</em> the completion objects are, and style
<tt>how</tt> they are to be completed. At various points of execution, the
completion system checks what styles and/or tags are defined for the
current context, and uses that to modify its behavior. The full
description of context handling, which determines how tags and other
elements of the context influence the behaviour of styles, is described
in <a href="#Completion-System-Configuration">Completion System Configuration</a>.
</p>
<p>When a completion is requested, a dispatcher function is called;
see the description of <tt>_main_complete</tt> in the list of control functions
below. This dispatcher decides which function should
be called to produce the completions, and calls it. The result is
passed to one or more <em>completers</em>, functions that implement
individual completion strategies: simple completion, error correction,
completion with error correction, menu selection, etc.
</p>
<p>More generally, the shell functions contained in the completion system are
of two types:
</p><ul>
<li> those beginning ‘<tt>comp</tt>’ are to be called directly; there are only
a few of these;
</li><li> those beginning ‘<tt>_</tt>’ are called by the
completion code. The shell functions of this set, which implement
completion behaviour and may be bound to keystrokes, are referred to
as ‘widgets’. These proliferate as new completions are required.
</li></ul>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#Initialization">20.2 Initialization</a></td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Completion-System-Configuration">20.3 Completion System Configuration</a></td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Control-Functions">20.4 Control Functions</a></td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Bindable-Commands">20.5 Bindable Commands</a></td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Completion-Functions">20.6 Utility Functions</a></td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Completion-Directories">20.7 Completion Directories</a></td><td> </td><td align="left" valign="top">
</td></tr>
</table>
<hr>
<a name="Initialization"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Description-3" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Use-of-compinit" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Initialization-1"></a>
<h2 class="section">20.2 Initialization</h2>
<a name="index-compinstall"></a>
<a name="index-completion-system_002c-installing"></a>
<p>If the system was installed completely, it should be enough to
call the shell function <tt>compinit</tt> from your initialization file; see the
next section. However, the function <tt>compinstall</tt> can be run by a user
to configure various aspects of the completion system.
</p>
<p>Usually, <tt>compinstall</tt> will insert code into <tt>.zshrc</tt>, although if
that is not writable it will save it in another file and tell you that
file’s location. Note that it is up to you to make sure that the lines
added to <tt>.zshrc</tt> are actually run; you may, for example, need to move
them to an earlier place in the file if <tt>.zshrc</tt> usually returns early.
So long as you keep them all together (including the comment lines at the
start and finish), you can rerun <tt>compinstall</tt> and it will correctly
locate and modify these lines. Note, however, that any code you add to
this section by hand is likely to be lost if you rerun <tt>compinstall</tt>,
although lines using the command ‘<tt>zstyle</tt>’ should be gracefully handled.
</p>
<p>The new code will take effect next time you start the shell, or run
<tt>.zshrc</tt> by hand; there is also an option to make them take effect
immediately. However, if <tt>compinstall</tt> has removed definitions, you will
need to restart the shell to see the changes.
</p>
<p>To run <tt>compinstall</tt> you will need to make sure it is in a directory
mentioned in your <tt>fpath</tt> parameter, which should already be the case if
zsh was properly configured as long as your startup files do not remove the
appropriate directories from <tt>fpath</tt>. Then it must be autoloaded
(‘<tt>autoload -U compinstall</tt>’ is recommended). You can abort the
installation any time you are being prompted for information, and your
<tt>.zshrc</tt> will not be altered at all; changes only take place right at the
end, where you are specifically asked for confirmation.
</p>
<hr>
<a name="Use-of-compinit"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Initialization" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Initialization" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Autoloaded-files" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<h3 class="subsection">20.2.1 Use of compinit</h3>
<a name="index-compinit"></a>
<a name="index-completion-system_002c-initializing"></a>
<p>This section describes the use of <tt>compinit</tt> to initialize completion for
the current session when called directly; if you have run
<tt>compinstall</tt> it will be called automatically from your <tt>.zshrc</tt>.
</p>
<p>To initialize the system, the function <tt>compinit</tt> should be in a
directory mentioned in the <tt>fpath</tt> parameter, and should be autoloaded
(‘<tt>autoload -U compinit</tt>’ is recommended), and then run simply as
‘<tt>compinit</tt>’. This will define a
few utility functions, arrange for all the necessary shell functions to be
autoloaded, and will then re-define all widgets that do completion to use the
new system. If you use the <tt>menu-select</tt> widget, which is part of the
<tt>zsh/complist</tt> module, you should make sure that that module is loaded
before the call to <tt>compinit</tt> so that that widget is also
re-defined. If completion styles (see below) are set up to perform
expansion as well as completion by default, and the TAB key is bound to
<tt>expand-or-complete</tt>, <tt>compinit</tt> will rebind it to <tt>complete-word</tt>;
this is necessary to use the correct form of expansion.
</p>
<p>Should you need to use the original completion commands, you can still
bind keys to the old widgets by putting a ‘<tt>.</tt>’ in front of the
widget name, e.g. ‘<tt>.expand-or-complete</tt>’.
</p>
<p>To speed up the running of <tt>compinit</tt>, it can be made to produce a dumped
configuration that will be read in on future invocations; this is the
default, but can be turned off by calling <tt>compinit</tt> with the
option <tt>-D</tt>. The dumped file is <tt>.zcompdump</tt> in the same
directory as the startup files (i.e. <tt>$ZDOTDIR</tt> or <tt>$HOME</tt>);
alternatively, an explicit file name can be given by ‘<tt>compinit -d</tt>
<var>dumpfile</var>’. The next invocation of <tt>compinit</tt> will read the dumped
file instead of performing a full initialization.
</p>
<p>If the number of completion files changes, <tt>compinit</tt> will recognise this
and produce a new dump file. However, if the name of a function or the
arguments in the first line of a <tt>#compdef</tt> function (as described below)
change, it is easiest to delete the dump file by hand so that
<tt>compinit</tt> will re-create it the next time it is run. The check
performed to see if there are new functions can be omitted by giving
the option <tt>-C</tt>. In this case the dump file will only be created if
there isn’t one already.
</p>
<p>The dumping is actually done by another function, <tt>compdump</tt>, but you
will only need to run this yourself if you change the configuration
(e.g. using <tt>compdef</tt>) and then want to dump the new one. The name of
the old dumped file will be remembered for this purpose.
</p>
<p>If the parameter <tt>_compdir</tt> is set, <tt>compinit</tt> uses it as a directory
where completion functions can be found; this is only necessary if they are
not already in the function search path.
</p>
<p>For security reasons <tt>compinit</tt> also checks if the completion system
would use files not owned by root or by the current user, or files in
directories that are world- or group-writable or that are not owned by
root or by the current user. If such files or directories are found,
<tt>compinit</tt> will ask if the completion system should really be used. To
avoid these tests and make all files found be used without asking, use the
option <tt>-u</tt>, and to make <tt>compinit</tt> silently ignore all insecure files
and directories use the option <tt>-i</tt>. This security check is skipped
entirely when the <tt>-C</tt> option is given.
</p>
<a name="index-compaudit"></a>
<p>The security check can be retried at any time by running the function
<tt>compaudit</tt>. This is the same check used by <tt>compinit</tt>, but when it
is executed directly any changes to <tt>fpath</tt> are made local to the
function so they do not persist. The directories to be checked may be
passed as arguments; if none are given, <tt>compaudit</tt> uses <tt>fpath</tt> and
<tt>_compdir</tt> to find completion system directories, adding missing ones
to <tt>fpath</tt> as necessary. To force a check of exactly the directories
currently named in <tt>fpath</tt>, set <tt>_compdir</tt> to an empty string before
calling <tt>compaudit</tt> or <tt>compinit</tt>.
</p>
<a name="index-bashcompinit"></a>
<p>The function <tt>bashcompinit</tt> provides compatibility with bash’s programmable
completion system. When run it will define the functions, <tt>compgen</tt> and
<tt>complete</tt> which correspond to the bash builtins with the same names.
It will then be possible to use completion specifications and functions
written for bash.
</p>
<hr>
<a name="Autoloaded-files"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Use-of-compinit" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Initialization" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Functions-2" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<h3 class="subsection">20.2.2 Autoloaded files</h3>
<a name="index-completion-system_002c-autoloaded-functions"></a>
<p>The convention for autoloaded functions used in completion is that they
start with an underscore; as already mentioned, the <tt>fpath/FPATH</tt>
parameter must contain the directory in which they are stored. If <tt>zsh</tt>
was properly installed on your system, then <tt>fpath/FPATH</tt> automatically
contains the required directories for the standard functions.
</p>
<p>For incomplete installations, if <tt>compinit</tt> does not find enough files
beginning with an underscore (fewer than twenty) in the search path, it
will try to find more by adding the directory <tt>_compdir</tt> to the search
path. If that directory has a subdirectory named <tt>Base</tt>, all
subdirectories will be added to the path. Furthermore, if the subdirectory
<tt>Base</tt> has a subdirectory named <tt>Core</tt>, <tt>compinit</tt> will add all
subdirectories of the subdirectories to the path: this allows
the functions to be in the same format as in the <tt>zsh</tt> source
distribution.
</p>
<a name="index-compdef_002c-use-of-by-compinit"></a>
<p>When <tt>compinit</tt> is run, it searches all such files accessible via
<tt>fpath/FPATH</tt> and reads the first line of each of them. This line should
contain one of the tags described below. Files whose first line does not
start with one of these tags are not considered to be part of the
completion system and will not be treated specially.
</p>
<p>The tags are:
</p>
<dl compact="compact">
<dt><tt>#compdef</tt> <var>name</var> ... [ <tt>-</tt>{<tt>p</tt>|<tt>P</tt>} <var>pattern</var> ... [ <tt>-N</tt> <var>name</var> ... ] ]</dt>
<dd><p>The file will be made autoloadable and the function defined
in it will be called when completing <var>name</var>s, each of which is
either the name of a command whose arguments are to be completed or one of
a number of special contexts in the form <tt>-</tt><var>context</var><tt>-</tt> described
below.
</p>
<p>Each <var>name</var> may also be of the form ‘<var>cmd</var><tt>=</tt><var>service</var>’.
When completing the command <var>cmd</var>, the function typically behaves as
if the command (or special context) <var>service</var> was being completed
instead. This provides a way of altering the behaviour of functions
that can perform many different completions. It is implemented
by setting the parameter <tt>$service</tt> when calling the function;
the function may choose to interpret this how it wishes, and simpler
functions will probably ignore it.
</p>
<p>If the <tt>#compdef</tt> line contains one of the options <tt>-p</tt> or <tt>-P</tt>,
the words following are taken to be patterns. The function will be
called when completion is attempted for a command or context that matches
one of the patterns. The options <tt>-p</tt> and <tt>-P</tt> are used to specify
patterns to be tried before or after other completions respectively.
Hence <tt>-P</tt> may be used to specify default actions.
</p>
<p>The option <tt>-N</tt> is used after a list following <tt>-p</tt> or <tt>-P</tt>; it
specifies that remaining words no longer define patterns. It is
possible to toggle between the three options as many times as necessary.
</p>
</dd>
<dt><tt>#compdef -k</tt> <var>style key-sequence</var> ...</dt>
<dd><p>This option creates a widget behaving like the
builtin widget <var>style</var> and binds it to the given <var>key-sequence</var>s,
if any. The <var>style</var> must be one of the builtin widgets that perform
completion, namely <tt>complete-word</tt>, <tt>delete-char-or-list</tt>,
<tt>expand-or-complete</tt>, <tt>expand-or-complete-prefix</tt>, <tt>list-choices</tt>,
<tt>menu-complete</tt>, <tt>menu-expand-or-complete</tt>, or
<tt>reverse-menu-complete</tt>. If the <tt>zsh/complist</tt> module is loaded (see
<a href="Zsh-Modules.html#The-zsh_002fcomplist-Module">The zsh/complist Module</a>) the widget <tt>menu-select</tt> is also available.
</p>
<p>When one of the <var>key-sequence</var>s is typed, the function in the file will
be invoked to generate the matches. Note that a key will not be re-bound
if it already was (that is, was bound to something other than
<tt>undefined-key</tt>). The widget created has the same name as the file and
can be bound to any other keys using <tt>bindkey</tt> as usual.
</p>
</dd>
<dt><tt>#compdef -K</tt> <var>widget-name</var> <var>style</var> <var>key-sequence</var> [ <var>name</var> <var>style</var> <var>seq</var> ... ]</dt>
<dd><p>This is similar to <tt>-k</tt> except that only one <var>key-sequence</var>
argument may be given for each <var>widget-name</var> <var>style</var> pair.
However, the entire set of three arguments may be repeated with a
different set of arguments. Note in particular that the
<var>widget-name</var> must be distinct in each set. If it does not begin with
‘<tt>_</tt>’ this will be added. The <var>widget-name</var> should not clash with
the name of any existing widget: names based on the name of the function
are most useful. For example,
</p>
<div class="example">
<pre class="example">#compdef -K _foo_complete complete-word "^X^C" \
_foo_list list-choices "^X^D"
</pre></div>
<p>(all on one line) defines a widget <tt>_foo_complete</tt> for completion, bound
to ‘<tt>^X^C</tt>’, and a widget <tt>_foo_list</tt> for listing, bound to ‘<tt>^X^D</tt>’.
</p>
</dd>
<dt><tt>#autoload</tt> [ <var>options</var> ]</dt>
<dd><p>Functions with the <tt>#autoload</tt> tag are marked for autoloading but
are not otherwise treated specially. Typically they are to be called
from within one of the completion functions. Any <var>options</var> supplied
will be passed to the <tt>autoload</tt> builtin; a typical use is <tt>+X</tt> to
force the function to be loaded immediately. Note that the <tt>-U</tt> and
<tt>-z</tt> flags are always added implicitly.
</p>
</dd>
</dl>
<p>The <tt>#</tt> is part of the tag name and no white space is allowed after it.
The <tt>#compdef</tt> tags use the <tt>compdef</tt> function described below; the
main difference is that the name of the function is supplied implicitly.
</p>
<p>The special contexts for which completion functions can be defined are:
</p>
<dl compact="compact">
<dd><a name="index-_002darray_002dvalue_002d_002c-completion-context"></a>
</dd>
<dt><tt>-array-value-</tt></dt>
<dd><p>The right hand side of an array-assignment
(‘<var>name</var><tt>=(</tt><var>...</var><tt>)</tt>’)
</p>
<a name="index-_002dbrace_002dparameter_002d_002c-completion-context"></a>
</dd>
<dt><tt>-brace-parameter-</tt></dt>
<dd><p>The name of a parameter expansion within braces (‘<tt>${</tt><var>...</var><tt>}</tt>’)
</p>
<a name="index-_002dassign_002dparameter_002d_002c-completion-context"></a>
</dd>
<dt><tt>-assign-parameter-</tt></dt>
<dd><p>The name of a parameter in an assignment, i.e. on the left hand side of
an ‘<tt>=</tt>’
</p>
<a name="index-_002dcommand_002d_002c-completion-context"></a>
</dd>
<dt><tt>-command-</tt></dt>
<dd><p>A word in command position
</p>
<a name="index-_002dcondition_002d_002c-completion-context"></a>
</dd>
<dt><tt>-condition-</tt></dt>
<dd><p>A word inside a condition (‘<tt>[[</tt><var>...</var><tt>]]</tt>’)
</p>
<a name="index-_002ddefault_002d_002c-completion-context"></a>
</dd>
<dt><tt>-default-</tt></dt>
<dd><p>Any word for which no other completion is defined
</p>
<a name="index-_002dequal_002d_002c-completion-context"></a>
</dd>
<dt><tt>-equal-</tt></dt>
<dd><p>A word beginning with an equals sign
</p>
<a name="index-_002dfirst_002d_002c-completion-context"></a>
</dd>
<dt><tt>-first-</tt></dt>
<dd><p>This is tried before any other completion function. The function called
may set the <tt>_compskip</tt> parameter to one of various values:
<tt>all</tt>: no further completion is attempted; a string
containing the substring <tt>patterns</tt>: no pattern completion functions
will be called; a string containing <tt>default</tt>: the
function for the ‘<tt>-default-</tt>’ context will not be called, but
functions defined for commands will be.
</p>
<a name="index-_002dmath_002d_002c-completion-context"></a>
</dd>
<dt><tt>-math-</tt></dt>
<dd><p>Inside mathematical contexts, such as
‘<tt>((</tt><var>...</var><tt>))</tt>’
</p>
<a name="index-_002dparameter_002d_002c-completion-context"></a>
</dd>
<dt><tt>-parameter-</tt></dt>
<dd><p>The name of a parameter expansion (‘<tt>$</tt><var>...</var>’)
</p>
<a name="index-_002dredirect_002d_002c-completion-context"></a>
</dd>
<dt><tt>-redirect-</tt></dt>
<dd><p>The word after a redirection operator.
</p>
<a name="index-_002dsubscript_002d_002c-completion-context"></a>
</dd>
<dt><tt>-subscript-</tt></dt>
<dd><p>The contents of a parameter subscript.
</p>
<a name="index-_002dtilde_002d_002c-completion-context"></a>
</dd>
<dt><tt>-tilde-</tt></dt>
<dd><p>After an initial tilde (‘<tt>~</tt>’), but before the first slash
in the word.
</p>
<a name="index-_002dvalue_002d_002c-completion-context"></a>
</dd>
<dt><tt>-value-</tt></dt>
<dd><p>On the right hand side of an assignment.
</p>
</dd>
</dl>
<p>Default implementations are supplied for each of these
contexts. In most cases the context <tt>-</tt><var>context</var><tt>-</tt> is
implemented by a corresponding function <tt>_</tt><var>context</var>, for example
the context ‘<tt>-tilde-</tt>’ and the function ‘<tt>_tilde</tt>’).
</p>
<p>The contexts <tt>-redirect-</tt> and <tt>-value-</tt> allow extra context-specific
information. (Internally, this is handled by the functions for each
context calling the function <tt>_dispatch</tt>.) The extra
information is added separated by commas.
</p>
<p>For the <tt>-redirect-</tt> context, the extra information is in the form
‘<tt>-redirect-,</tt><var>op</var><tt>,</tt><var>command</var>’, where <var>op</var> is the
redirection operator and <var>command</var> is the name of the command on
the line. If there is no command on the line yet, the <var>command</var>
field will be empty.
</p>
<p>For the <tt>-value-</tt> context, the form is
‘<tt>-value-,</tt><var>name</var><tt>,</tt><var>command</var>’, where <var>name</var> is the name of
the parameter on the left hand side of the assignment.
In the case of elements of an associative array, for
example ‘<tt>assoc=(key <TAB></tt>’, <var>name</var> is expanded to
‘<var>name</var><tt>-</tt><var>key</var>’. In certain special contexts, such as
completing after ‘<tt>make CFLAGS=</tt>’, the <var>command</var> part gives the
name of the command, here <tt>make</tt>; otherwise it is empty.
</p>
<p>It is not necessary to define fully specific completions as the
functions provided will try to generate completions by progressively
replacing the elements with ‘<tt>-default-</tt>’. For example, when
completing after ‘<tt>foo=<TAB></tt>’, <tt>_value</tt> will try the names
‘<tt>-value-,foo,</tt>’ (note the empty <var>command</var> part),
‘<tt>-value-,foo,-default-</tt>’ and‘<tt>-value-,-default-,-default-</tt>’, in
that order, until it finds a function to handle the context.
</p>
<p>As an example:
</p>
<div class="example">
<pre class="example">compdef '_files -g "*.log"' '-redirect-,2>,-default-'
</pre></div>
<p>completes files matching ‘<tt>*.log</tt>’ after ‘<tt>2> <TAB></tt>’ for any
command with no more specific handler defined.
</p>
<p>Also:
</p>
<div class="example">
<pre class="example">compdef _foo -value-,-default-,-default-
</pre></div>
<p>specifies that <tt>_foo</tt> provides completions for the values of
parameters for which no special function has been defined. This is
usually handled by the function <tt>_value</tt> itself.
</p>
<p>The same lookup rules are used when looking up styles (as described
below); for example
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:-redirect-,2>,*:*' file-patterns '*.log'
</pre></div>
<p>is another way to make completion after ‘<tt>2> <TAB></tt>’ complete files
matching ‘<tt>*.log</tt>’.
</p>
<hr>
<a name="Functions-2"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Autoloaded-files" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Initialization" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System-Configuration" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<h3 class="subsection">20.2.3 Functions</h3>
<p>The following function is defined by <tt>compinit</tt> and may be called
directly.
</p>
<a name="index-compdef"></a>
<a name="index-completion-system_002c-adding-definitions"></a>
<dl compact="compact">
<dt><tt>compdef</tt> [ <tt>-ane</tt> ] <var>function name</var> ... [ <tt>-</tt>{<tt>p</tt>|<tt>P</tt>} <var>pattern</var> ... [ <tt>-N</tt> <var>name</var> ...]]</dt>
<dt><tt>compdef -d</tt> <var>name</var> ...</dt>
<dt><tt>compdef -k</tt> [ <tt>-an</tt> ] <var>function style key-sequence</var> [ <var>key-sequence</var> ... ]</dt>
<dt><tt>compdef -K</tt> [ <tt>-an</tt> ] <var>function name style key-seq</var> [ <var>name style seq</var> ... ]</dt>
<dd><p>The first form defines the <var>function</var> to call for completion in the
given contexts as described for the <tt>#compdef</tt> tag above.
</p>
<p>Alternatively, all the arguments may have the form
‘<var>cmd</var><tt>=</tt><var>service</var>’. Here <var>service</var> should already have been
defined by ‘<var>cmd1</var><tt>=</tt><var>service</var>’ lines in <tt>#compdef</tt> files, as
described above. The argument for <var>cmd</var> will be completed in the
same way as <var>service</var>.
</p>
<p>The <var>function</var> argument may alternatively be a string containing
almost any shell code. If the string contains an equal sign, the above
will take precedence. The option <tt>-e</tt> may be used to specify the first
argument is to be evaluated as shell code even if it contains an equal
sign. The string will be executed using the <tt>eval</tt> builtin command to
generate completions. This provides a way of avoiding having to define
a new completion function. For example, to complete files ending in
‘<tt>.h</tt>’ as arguments to the command <tt>foo</tt>:
</p>
<div class="example">
<pre class="example">compdef '_files -g "*.h"' foo
</pre></div>
<p>The option <tt>-n</tt> prevents any completions already defined for the
command or context from being overwritten.
</p>
<p>The option <tt>-d</tt> deletes any completion defined for the command or
contexts listed.
</p>
<p>The <var>name</var>s may also contain <tt>-p</tt>, <tt>-P</tt> and <tt>-N</tt> options as
described for the <tt>#compdef</tt> tag. The effect on the argument list is
identical, switching between definitions of patterns tried initially,
patterns tried finally, and normal commands and contexts.
</p>
<p>The parameter <tt>$_compskip</tt> may be set by any function defined for a
pattern context. If it is set to a value containing the substring
‘<tt>patterns</tt>’ none of the pattern-functions will be called; if it is
set to a value containing the substring ‘<tt>all</tt>’, no other function
will be called.
</p>
<p>The form with <tt>-k</tt> defines a widget with the same name as the <var>function</var>
that will be called for each of the <var>key-sequence</var>s; this is like the
<tt>#compdef -k</tt> tag. The function should generate the completions needed
and will otherwise behave like the builtin widget whose name is given as
the <var>style</var> argument. The widgets usable for this are:
<tt>complete-word</tt>, <tt>delete-char-or-list</tt>, <tt>expand-or-complete</tt>,
<tt>expand-or-complete-prefix</tt>, <tt>list-choices</tt>, <tt>menu-complete</tt>,
<tt>menu-expand-or-complete</tt>, and <tt>reverse-menu-complete</tt>, as well as
<tt>menu-select</tt> if the <tt>zsh/complist</tt> module is loaded. The option <tt>-n</tt>
prevents the key being bound if it is already to bound to something other
than <tt>undefined-key</tt>.
</p>
<p>The form with <tt>-K</tt> is similar and defines multiple widgets based on the
same <var>function</var>, each of which requires the set of three arguments
<var>name</var>, <var>style</var> and <var>key-seq</var>uence, where the latter two are as
for <tt>-k</tt> and the first must be a unique widget name beginning with an
underscore.
</p>
<p>Wherever applicable, the <tt>-a</tt> option makes the <var>function</var>
autoloadable, equivalent to <tt>autoload -U </tt><var>function</var>.
</p>
</dd>
</dl>
<p>The function <tt>compdef</tt> can be used to associate existing completion
functions with new commands. For example,
</p>
<div class="example">
<pre class="example">compdef _pids foo
</pre></div>
<p>uses the function <tt>_pids</tt> to complete process IDs for the command <tt>foo</tt>.
</p>
<p>Note also the <tt>_gnu_generic</tt> function described below, which can be
used to complete options for commands that understand the
‘<tt>-</tt><tt>-help</tt>’ option.
</p>
<hr>
<a name="Completion-System-Configuration"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Functions-2" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Overview-2" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Completion-System-Configuration-1"></a>
<h2 class="section">20.3 Completion System Configuration</h2>
<a name="index-completion-system_002c-configuration"></a>
<p>This section gives a short overview of how the completion system works,
and then more detail on how users can configure how and when matches are
generated.
</p>
<hr>
<a name="Overview-2"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System-Configuration" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System-Configuration" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Standard-Tags" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<h3 class="subsection">20.3.1 Overview</h3>
<p>When completion is attempted somewhere on the command line the
completion system begins building the context. The context represents
everything that the shell knows about the meaning of the command line
and the significance of the cursor position. This takes account of a
number of things including the command word (such as ‘<tt>grep</tt>’ or
‘<tt>zsh</tt>’) and options to which the current word may be an argument
(such as the ‘<tt>-o</tt>’ option to <tt>zsh</tt> which takes a shell option as an
argument).
</p>
<p>The context starts out very generic ("we are beginning a completion")
and becomes more specific as more is learned ("the current word is in a
position that is usually a command name" or "the current word might be a
variable name" and so on). Therefore the context will vary during the
same call to the completion system.
</p>
<p>This context information is condensed into a string consisting of multiple
fields separated by colons, referred to simply as ‘the context’ in the
remainder of the documentation. Note that a user of the completion system
rarely needs to compose a context string, unless for example a new
function is being written to perform completion for a new command. What a
user may need to do is compose a <em>style</em> pattern, which is matched
against a context when needed to look up context-sensitive options that
configure the completion system.
</p>
<p>The next few paragraphs explain how a context is composed within the
completion function suite. Following that is discussion of how <em>styles</em>
are defined. Styles determine such things as how the matches are
generated, similarly to shell options but with much more control. They
are defined with the <tt>zstyle</tt> builtin command (<a href="Zsh-Modules.html#The-zsh_002fzutil-Module">The zsh/zutil Module</a>).
</p>
<p>The context string always consists of a fixed set of fields, separated
by colons and with a leading colon before the first. Fields which are
not yet known are left empty, but the surrounding colons appear anyway.
The fields are always in the order
<tt>:completion:</tt><var>function</var><tt>:</tt><var>completer</var><tt>:</tt><var>command</var><tt>:</tt><var>argument</var><tt>:</tt><var>tag</var>. These have the following meaning:
</p>
<ul>
<li> The literal string <tt>completion</tt>, saying that this style is used by
the completion system. This distinguishes the context from those used
by, for example, zle widgets and ZFTP functions.
</li><li> The <var>function</var>, if completion is called from a named widget rather
than through the normal completion system. Typically this is blank, but
it is set by special widgets such as <tt>predict-on</tt> and the various
functions in the <tt>Widget</tt> directory of the distribution to the name of
that function, often in an abbreviated form.
</li><li> The <var>completer</var> currently active, the name of the function without the
leading underscore and with other underscores converted to hyphens. A
‘completer’ is in overall control of how completion is to be performed;
‘<tt>complete</tt>’ is the simplest, but other completers exist to perform
related tasks such as correction, or to modify the behaviour of a later
completer. See
<a href="#Control-Functions">Control Functions</a>
for more information.
</li><li> The <var>command</var> or a special <tt>-</tt><var>context</var><tt>-</tt>, just at it appears
following the <tt>#compdef</tt> tag or the <tt>compdef</tt> function. Completion
functions for commands that have sub-commands usually modify this field
to contain the name of the command followed by a minus sign and the
sub-command. For example, the completion function for the <tt>cvs</tt>
command sets this field to <tt>cvs-add</tt> when completing arguments to
the <tt>add</tt> subcommand.
</li><li> The <var>argument</var>; this indicates which command line or option argument
we are completing. For command arguments this generally takes the form
<tt>argument-</tt><var>n</var>, where <var>n</var> is the number of the argument,
and for arguments to options the form <tt>option-</tt><var>opt</var><tt>-</tt><var>n</var>
where <var>n</var> is the number of the argument to option <var>opt</var>. However,
this is only the case if the command line is parsed with standard
UNIX-style options and arguments, so many completions do not set this.
</li><li> The <var>tag</var>. As described previously, tags are used to discriminate between
the types of matches a completion function can generate in a certain context.
Any completion function may use any tag name it likes, but a list of the
more common ones is given below.
</li></ul>
<p>The context is gradually put together as the functions are executed, starting
with the main entry point, which adds <tt>:completion:</tt> and the <var>function</var>
element if necessary. The completer then adds the <var>completer</var> element.
The contextual completion adds the <var>command</var> and <var>argument</var> options.
Finally, the <var>tag</var> is added when the types of completion are known.
For example, the context name
</p>
<div class="example">
<pre class="example"><tt>:completion::complete:dvips:option-o-1:files</tt>
</pre></div>
<p>says that normal completion was attempted as the first argument to the
option <tt>-o</tt> of the command <tt>dvips</tt>:
</p>
<div class="example">
<pre class="example"><tt>dvips -o ...</tt>
</pre></div>
<p>and the completion function will generate filenames.
</p>
<p>Usually completion will be tried for all possible tags in an order given
by the completion function. However, this can be altered by using the
<tt>tag-order</tt> style. Completion is then restricted to the list of given
tags in the given order.
</p>
<p>The <tt>_complete_help</tt> bindable command shows all the contexts and tags
available for completion at a particular point. This provides an easy
way of finding information for <tt>tag-order</tt> and other styles. It is
described in
<a href="#Bindable-Commands">Bindable Commands</a>.
</p>
<p>When looking up styles the completion system uses full context names,
including the tag. Looking up the value of a style therefore consists of
two things: the context, which is matched to the most specific (best
fitting) style pattern, and the name of the style itself, which must be
matched exactly. The following examples demonstrate that style patterns
may be loosely defined for styles that apply broadly, or as tightly
defined as desired for styles that apply in narrower circumstances.
</p>
<p>For example, many completion functions can generate matches in a
simple and a verbose form and use the <tt>verbose</tt> style to decide
which form should be used. To make all such functions use the verbose form,
put
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' verbose yes
</pre></div>
<p>in a startup file (probably <tt>.zshrc</tt>).
This gives the <tt>verbose</tt> style the value <tt>yes</tt> in every
context inside the completion system, unless that context has a more
specific definition. It is best to avoid giving the context as ‘<tt>*</tt>’
in case the style has some meaning outside the completion system.
</p>
<p>Many such general purpose styles can be configured simply by using the
<tt>compinstall</tt> function.
</p>
<p>A more specific example of the use of the <tt>verbose</tt> style is by the
completion for the <tt>kill</tt> builtin. If the style is set, the builtin
lists full job texts and process command lines; otherwise it shows the
bare job numbers and PIDs. To turn the style off for this use only:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:kill:*:*' verbose no
</pre></div>
<p>For even more control, the style can use one of the tags ‘<tt>jobs</tt>’ or
‘<tt>processes</tt>’. To turn off verbose display only for jobs:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:kill:*:jobs' verbose no
</pre></div>
<p>The <tt>-e</tt> option to <tt>zstyle</tt> even allows completion function code to
appear as the argument to a style; this requires some understanding of
the internals of completion functions (see
<a href="Completion-Widgets.html#Completion-Widgets">Completion Widgets</a>)). For example,
</p>
<div class="example">
<pre class="example"><tt>zstyle -e ':completion:*' hosts 'reply=($myhosts)'</tt>
</pre></div>
<p>This forces the value of the <tt>hosts</tt> style to be read from the
variable <tt>myhosts</tt> each time a host name is needed; this is useful
if the value of <tt>myhosts</tt> can change dynamically.
For another useful example, see the example in the description of the
<tt>file-list</tt> style below. This form can be
slow and should be avoided for commonly examined styles such
as <tt>menu</tt> and <tt>list-rows-first</tt>.
</p>
<p>Note that the order in which styles are <em>defined</em> does not matter; the
style mechanism uses the most specific possible match for a particular
style to determine the set of values. More precisely, strings are
preferred over patterns (for example, ‘<tt>:completion::complete:::foo</tt>’ is
more specific than ‘<tt>:completion::complete:::*'</tt>), and longer patterns are
preferred over shorter patterns.
</p>
<p>A good rule of thumb is that any completion style pattern that needs to
include more than one wildcard (<tt>*</tt>) and that does not end in a tag
name, should include all six colons (<tt>:</tt>), possibly surrounding
additional wildcards.
</p>
<p>Style names like those of tags are arbitrary and depend on the completion
function. However, the following two sections list some of the most
common tags and styles.
</p>
<hr>
<a name="Standard-Tags"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Overview-2" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System-Configuration" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Standard-Styles" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<h3 class="subsection">20.3.2 Standard Tags</h3>
<a name="index-completion-system_002c-tags"></a>
<p>Some of the following are only used when looking up particular styles
and do not refer to a type of match.
</p>
<dl compact="compact">
<dd><a name="index-accounts_002c-completion-tag"></a>
</dd>
<dt><tt>accounts</tt></dt>
<dd><p>used to look up the <tt>users-hosts</tt> style
</p>
<a name="index-all_002dexpansions_002c-completion-tag"></a>
</dd>
<dt><tt>all-expansions</tt></dt>
<dd><p>used by the <tt>_expand</tt> completer when adding the single string containing
all possible expansions
</p>
<a name="index-all_002dfiles_002c-completion-tag"></a>
</dd>
<dt><tt>all-files</tt></dt>
<dd><p>for the names of all files (as distinct from a particular subset, see the
<tt>globbed-files</tt> tag).
</p>
<a name="index-arguments_002c-completion-tag"></a>
</dd>
<dt><tt>arguments</tt></dt>
<dd><p>for arguments to a command
</p>
<a name="index-arrays_002c-completion-tag"></a>
</dd>
<dt><tt>arrays</tt></dt>
<dd><p>for names of array parameters
</p>
<a name="index-association_002dkeys_002c-completion-tag"></a>
</dd>
<dt><tt>association-keys</tt></dt>
<dd><p>for keys of associative arrays; used when completing inside a
subscript to a parameter of this type
</p>
<a name="index-bookmarks_002c-completion-tag"></a>
</dd>
<dt><tt>bookmarks</tt></dt>
<dd><p>when completing bookmarks (e.g. for URLs and the <tt>zftp</tt> function suite)
</p>
<a name="index-builtins_002c-completion-tag"></a>
</dd>
<dt><tt>builtins</tt></dt>
<dd><p>for names of builtin commands
</p>
<a name="index-characters_002c-completion-tag"></a>
</dd>
<dt><tt>characters</tt></dt>
<dd><p>for single characters in arguments of commands such as <tt>stty</tt>. Also used
when completing character classes after an opening bracket
</p>
<a name="index-colormapids_002c-completion-tag"></a>
</dd>
<dt><tt>colormapids</tt></dt>
<dd><p>for X colormap ids
</p>
<a name="index-colors_002c-completion-tag"></a>
</dd>
<dt><tt>colors</tt></dt>
<dd><p>for color names
</p>
<a name="index-commands_002c-completion-tag"></a>
</dd>
<dt><tt>commands</tt></dt>
<dd><p>for names of external commands. Also used by complex commands such as
<tt>cvs</tt> when completing names subcommands.
</p>
<a name="index-contexts_002c-completion-tag"></a>
</dd>
<dt><tt>contexts</tt></dt>
<dd><p>for contexts in arguments to the <tt>zstyle</tt> builtin command
</p>
<a name="index-corrections_002c-completion-tag"></a>
</dd>
<dt><tt>corrections</tt></dt>
<dd><p>used by the <tt>_approximate</tt> and <tt>_correct</tt> completers for possible
corrections
</p>
<a name="index-cursors_002c-completion-tag"></a>
</dd>
<dt><tt>cursors</tt></dt>
<dd><p>for cursor names used by X programs
</p>
<a name="index-default_002c-completion-tag"></a>
</dd>
<dt><tt>default</tt></dt>
<dd><p>used in some contexts to provide a way of supplying a default when more
specific tags are also valid. Note that this tag is
used when only the <var>function</var> field of the context name is set
</p>
<a name="index-descriptions_002c-completion-tag"></a>
</dd>
<dt><tt>descriptions</tt></dt>
<dd><p>used when looking up the value of the <tt>format</tt> style to generate
descriptions for types of matches
</p>
<a name="index-devices_002c-completion-tag"></a>
</dd>
<dt><tt>devices</tt></dt>
<dd><p>for names of device special files
</p>
<a name="index-directories_002c-completion-tag"></a>
</dd>
<dt><tt>directories</tt></dt>
<dd><p>for names of directories — <tt>local-directories</tt> is used instead
when completing arguments of <tt>cd</tt> and related builtin commands when
the <tt>cdpath</tt> array is set
</p>
<a name="index-directory_002dstack_002c-completion-tag"></a>
</dd>
<dt><tt>directory-stack</tt></dt>
<dd><p>for entries in the directory stack
</p>
<a name="index-displays_002c-completion-tag"></a>
</dd>
<dt><tt>displays</tt></dt>
<dd><p>for X display names
</p>
<a name="index-domains_002c-completion-tag"></a>
</dd>
<dt><tt>domains</tt></dt>
<dd><p>for network domains
</p>
<a name="index-expansions_002c-completion-tag"></a>
</dd>
<dt><tt>expansions</tt></dt>
<dd><p>used by the <tt>_expand</tt> completer for individual words (as opposed to
the complete set of expansions) resulting from the expansion of a word
on the command line
</p>
<a name="index-extensions_002c-completion-tag"></a>
</dd>
<dt><tt>extensions</tt></dt>
<dd><p>for X server extensions
</p>
<a name="index-file_002ddescriptors_002c-completion-tag"></a>
</dd>
<dt><tt>file-descriptors</tt></dt>
<dd><p>for numbers of open file descriptors
</p>
<a name="index-files_002c-completion-tag"></a>
</dd>
<dt><tt>files</tt></dt>
<dd><p>the generic file-matching tag used by functions completing filenames
</p>
<a name="index-fonts_002c-completion-tag"></a>
</dd>
<dt><tt>fonts</tt></dt>
<dd><p>for X font names
</p>
<a name="index-fstypes_002c-completion-tag"></a>
</dd>
<dt><tt>fstypes</tt></dt>
<dd><p>for file system types (e.g. for the <tt>mount</tt> command)
</p>
<a name="index-functions_002c-completion-tag"></a>
</dd>
<dt><tt>functions</tt></dt>
<dd><p>names of functions — normally shell functions, although certain
commands may understand other kinds of function
</p>
<a name="index-globbed_002dfiles_002c-completion-tag"></a>
</dd>
<dt><tt>globbed-files</tt></dt>
<dd><p>for filenames when the name has been generated by pattern matching
</p>
<a name="index-groups_002c-completion-tag"></a>
</dd>
<dt><tt>groups</tt></dt>
<dd><p>for names of user groups
</p>
<a name="index-history_002dwords_002c-completion-tag"></a>
</dd>
<dt><tt>history-words</tt></dt>
<dd><p>for words from the history
</p>
<a name="index-hosts_002c-completion-tag"></a>
</dd>
<dt><tt>hosts</tt></dt>
<dd><p>for hostnames
</p>
<a name="index-indexes_002c-completion-tag"></a>
</dd>
<dt><tt>indexes</tt></dt>
<dd><p>for array indexes
</p>
<a name="index-jobs_002c-completion-tag"></a>
</dd>
<dt><tt>jobs</tt></dt>
<dd><p>for jobs (as listed by the ‘<tt>jobs</tt>’ builtin)
</p>
<a name="index-interfaces_002c-completion-tag"></a>
</dd>
<dt><tt>interfaces</tt></dt>
<dd><p>for network interfaces
</p>
<a name="index-keymaps_002c-completion-tag"></a>
</dd>
<dt><tt>keymaps</tt></dt>
<dd><p>for names of zsh keymaps
</p>
<a name="index-keysyms_002c-completion-tag"></a>
</dd>
<dt><tt>keysyms</tt></dt>
<dd><p>for names of X keysyms
</p>
<a name="index-libraries_002c-completion-tag"></a>
</dd>
<dt><tt>libraries</tt></dt>
<dd><p>for names of system libraries
</p>
<a name="index-limits_002c-completion-tag"></a>
</dd>
<dt><tt>limits</tt></dt>
<dd><p>for system limits
</p>
<a name="index-local_002ddirectories_002c-completion-tag"></a>
</dd>
<dt><tt>local-directories</tt></dt>
<dd><p>for names of directories that are subdirectories of the current working
directory when completing arguments of <tt>cd</tt> and related builtin
commands (compare <tt>path-directories</tt>) — when the <tt>cdpath</tt>
array is unset, <tt>directories</tt> is used instead
</p>
<a name="index-manuals_002c-completion-tag"></a>
</dd>
<dt><tt>manuals</tt></dt>
<dd><p>for names of manual pages
</p>
<a name="index-mailboxes_002c-completion-tag"></a>
</dd>
<dt><tt>mailboxes</tt></dt>
<dd><p>for e-mail folders
</p>
<a name="index-maps_002c-completion-tag"></a>
</dd>
<dt><tt>maps</tt></dt>
<dd><p>for map names (e.g. NIS maps)
</p>
<a name="index-messages_002c-completion-tag"></a>
</dd>
<dt><tt>messages</tt></dt>
<dd><p>used to look up the <tt>format</tt> style for messages
</p>
<a name="index-modifiers_002c-completion-tag"></a>
</dd>
<dt><tt>modifiers</tt></dt>
<dd><p>for names of X modifiers
</p>
<a name="index-modules_002c-completion-tag"></a>
</dd>
<dt><tt>modules</tt></dt>
<dd><p>for modules (e.g. <tt>zsh</tt> modules)
</p>
<a name="index-my_002daccounts_002c-completion-tag"></a>
</dd>
<dt><tt>my-accounts</tt></dt>
<dd><p>used to look up the <tt>users-hosts</tt> style
</p>
<a name="index-named_002ddirectories_002c-completion-tag"></a>
</dd>
<dt><tt>named-directories</tt></dt>
<dd><p>for named directories (you wouldn’t have guessed that, would you?)
</p>
<a name="index-names_002c-completion-tag"></a>
</dd>
<dt><tt>names</tt></dt>
<dd><p>for all kinds of names
</p>
<a name="index-newsgroups_002c-completion-tag"></a>
</dd>
<dt><tt>newsgroups</tt></dt>
<dd><p>for USENET groups
</p>
<a name="index-nicknames_002c-completion-tag"></a>
</dd>
<dt><tt>nicknames</tt></dt>
<dd><p>for nicknames of NIS maps
</p>
<a name="index-options_002c-completion-tag"></a>
</dd>
<dt><tt>options</tt></dt>
<dd><p>for command options
</p>
<a name="index-original_002c-completion-tag"></a>
</dd>
<dt><tt>original</tt></dt>
<dd><p>used by the <tt>_approximate</tt>, <tt>_correct</tt> and <tt>_expand</tt> completers when
offering the original string as a match
</p>
<a name="index-other_002daccounts_002c-completion-tag"></a>
</dd>
<dt><tt>other-accounts</tt></dt>
<dd><p>used to look up the <tt>users-hosts</tt> style
</p>
<a name="index-other_002dfiles_002c-completion-tag"></a>
</dd>
<dt><tt>other-files</tt></dt>
<dd><p>for the names of any non-directory files. This is used instead
of <tt>all-files</tt> when the <tt>list-dirs-first</tt> style is in effect.
</p>
<a name="index-packages_002c-completion-tag"></a>
</dd>
<dt><tt>packages</tt></dt>
<dd><p>for packages (e.g. <tt>rpm</tt> or installed <tt>Debian</tt> packages)
</p>
<a name="index-parameters_002c-completion-tag"></a>
</dd>
<dt><tt>parameters</tt></dt>
<dd><p>for names of parameters
</p>
<a name="index-path_002ddirectories_002c-completion-tag"></a>
</dd>
<dt><tt>path-directories</tt></dt>
<dd><p>for names of directories found by searching the <tt>cdpath</tt> array when
completing arguments of <tt>cd</tt> and related builtin commands (compare
<tt>local-directories</tt>)
</p>
<a name="index-paths_002c-completion-tag"></a>
</dd>
<dt><tt>paths</tt></dt>
<dd><p>used to look up the values of the <tt>expand</tt>, <tt>ambiguous</tt> and
<tt>special-dirs</tt> styles
</p>
<a name="index-pods_002c-completion-tag"></a>
</dd>
<dt><tt>pods</tt></dt>
<dd><p>for perl pods (documentation files)
</p>
<a name="index-ports_002c-completion-tag"></a>
</dd>
<dt><tt>ports</tt></dt>
<dd><p>for communication ports
</p>
<a name="index-prefixes_002c-completion-tag"></a>
</dd>
<dt><tt>prefixes</tt></dt>
<dd><p>for prefixes (like those of a URL)
</p>
<a name="index-printers_002c-completion-tag"></a>
</dd>
<dt><tt>printers</tt></dt>
<dd><p>for print queue names
</p>
<a name="index-processes_002c-completion-tag"></a>
</dd>
<dt><tt>processes</tt></dt>
<dd><p>for process identifiers
</p>
<a name="index-processes_002dnames_002c-completion-tag"></a>
</dd>
<dt><tt>processes-names</tt></dt>
<dd><p>used to look up the <tt>command</tt> style when generating the names of
processes for <tt>killall</tt>
</p>
<a name="index-sequences_002c-completion-tag"></a>
</dd>
<dt><tt>sequences</tt></dt>
<dd><p>for sequences (e.g. <tt>mh</tt> sequences)
</p>
<a name="index-sessions_002c-completion-tag"></a>
</dd>
<dt><tt>sessions</tt></dt>
<dd><p>for sessions in the <tt>zftp</tt> function suite
</p>
<a name="index-signals_002c-completion-tag"></a>
</dd>
<dt><tt>signals</tt></dt>
<dd><p>for signal names
</p>
<a name="index-strings_002c-completion-tag"></a>
</dd>
<dt><tt>strings</tt></dt>
<dd><p>for strings (e.g. the replacement strings for the <tt>cd</tt> builtin
command)
</p>
<a name="index-styles_002c-completion-tag"></a>
</dd>
<dt><tt>styles</tt></dt>
<dd><p>for styles used by the zstyle builtin command
</p>
<a name="index-suffixes_002c-completion-tag"></a>
</dd>
<dt><tt>suffixes</tt></dt>
<dd><p>for filename extensions
</p>
<a name="index-tags_002c-completion-tag"></a>
</dd>
<dt><tt>tags</tt></dt>
<dd><p>for tags (e.g. <tt>rpm</tt> tags)
</p>
<a name="index-targets_002c-completion-tag"></a>
</dd>
<dt><tt>targets</tt></dt>
<dd><p>for makefile targets
</p>
<a name="index-time_002dzones_002c-completion-tag"></a>
</dd>
<dt><tt>time-zones</tt></dt>
<dd><p>for time zones (e.g. when setting the <tt>TZ</tt> parameter)
</p>
<a name="index-types_002c-completion-tag"></a>
</dd>
<dt><tt>types</tt></dt>
<dd><p>for types of whatever (e.g. address types for the <tt>xhost</tt> command)
</p>
<a name="index-urls_002c-completion-tag"></a>
</dd>
<dt><tt>urls</tt></dt>
<dd><p>used to look up the <tt>urls</tt> and <tt>local</tt> styles when completing URLs
</p>
<a name="index-users_002c-completion-tag"></a>
</dd>
<dt><tt>users</tt></dt>
<dd><p>for usernames
</p>
<a name="index-values_002c-completion-tag"></a>
</dd>
<dt><tt>values</tt></dt>
<dd><p>for one of a set of values in certain lists
</p>
<a name="index-variant_002c-completion-tag"></a>
</dd>
<dt><tt>variant</tt></dt>
<dd><p>used by <tt>_pick_variant</tt> to look up the command to run when determining
what program is installed for a particular command name.
</p>
<a name="index-visuals_002c-completion-tag"></a>
</dd>
<dt><tt>visuals</tt></dt>
<dd><p>for X visuals
</p>
<a name="index-warnings_002c-completion-tag"></a>
</dd>
<dt><tt>warnings</tt></dt>
<dd><p>used to look up the <tt>format</tt> style for warnings
</p>
<a name="index-widgets_002c-completion-tag"></a>
</dd>
<dt><tt>widgets</tt></dt>
<dd><p>for zsh widget names
</p>
<a name="index-windows_002c-completion-tag"></a>
</dd>
<dt><tt>windows</tt></dt>
<dd><p>for IDs of X windows
</p>
<a name="index-zsh_002doptions_002c-completion-tag"></a>
</dd>
<dt><tt>zsh-options</tt></dt>
<dd><p>for shell options
</p>
</dd>
</dl>
<hr>
<a name="Standard-Styles"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Standard-Tags" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System-Configuration" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Control-Functions" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<h3 class="subsection">20.3.3 Standard Styles</h3>
<a name="index-completion-system_002c-styles"></a>
<p>Note that the values of several of these styles represent boolean
values. Any of the strings ‘<tt>true</tt>’, ‘<tt>on</tt>’,
‘<tt>yes</tt>’, and ‘<tt>1</tt>’ can be used for the value ‘true’ and
any of the strings ‘<tt>false</tt>’, ‘<tt>off</tt>’, ‘<tt>no</tt>’, and ‘<tt>0</tt>’ for
the value ‘false’. The behavior for any other value is undefined
except where explicitly mentioned. The default value may
be either ‘true’ or ‘false’ if the style is not set.
</p>
<p>Some of these styles are tested first for every possible tag
corresponding to a type of match, and if no style was found, for the
<tt>default</tt> tag. The most notable styles of this type are <tt>menu</tt>,
<tt>list-colors</tt> and styles controlling completion listing such as
<tt>list-packed</tt> and <tt>last-prompt</tt>. When tested for the <tt>default</tt>
tag, only the <var>function</var> field of the context will be set so that
a style using the default tag will normally be defined along the lines of:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:default' menu ...
</pre></div>
<dl compact="compact">
<dd><a name="index-accept_002dexact_002c-completion-style"></a>
</dd>
<dt><tt>accept-exact</tt></dt>
<dd><p>This is tested for the default tag in addition to the tags valid for
the current context. If it is set to ‘true’ and any of the trial
matches is the same as the string on the command line, this match will
immediately be accepted (even if it would otherwise be considered
ambiguous).
</p>
<p>When completing pathnames (where the tag used is ‘<tt>paths</tt>’)
this style accepts any number of patterns as the value in addition to
the boolean values. Pathnames matching one of these
patterns will be accepted immediately even if the command line contains
some more partially typed pathname components and these match no file
under the directory accepted.
</p>
<p>This style is also used by the <tt>_expand</tt> completer to decide if
words beginning with a tilde or parameter expansion should be
expanded. For example, if there are parameters
<tt>foo</tt> and <tt>foobar</tt>, the string ‘<tt>$foo</tt>’ will only be expanded if
<tt>accept-exact</tt> is set to ‘true’; otherwise the completion system will
be allowed to complete <tt>$foo</tt> to <tt>$foobar</tt>. If the style is set to
‘<tt>continue</tt>’, <tt>_expand</tt> will add the expansion as a match and the completion
system will also be allowed to continue.
</p>
<a name="index-accept_002dexact_002ddirs_002c-completion-style"></a>
</dd>
<dt><tt>accept-exact-dirs</tt></dt>
<dd><p>This is used by filename completion. Unlike <tt>accept-exact</tt> it is
a boolean. By default, filename completion examines all components
of a path to see if there are completions of that component, even if
the component matches an existing directory. For example, when
completion after <tt>/usr/bin/</tt>, the function examines possible
completions to <tt>/usr</tt>.
</p>
<p>When this style is ‘true’, any prefix of a path that matches an existing
directory is accepted without any attempt to complete it further.
Hence, in the given example, the path <tt>/usr/bin/</tt> is accepted
immediately and completion tried in that directory.
</p>
<p>If you wish to inhibit this behaviour entirely, set the <tt>path-completion</tt>
style (see below) to ‘false’.
</p>
<a name="index-add_002dspace_002c-completion-style"></a>
</dd>
<dt><tt>add-space</tt></dt>
<dd><p>This style is used by the <tt>_expand</tt> completer. If it is ‘true’ (the
default), a space will be inserted after all words resulting from the
expansion, or a slash in the case of directory names. If the value
is ‘<tt>file</tt>’, the completer will only add a space
to names of existing files. Either a boolean ‘true’ or the value
‘<tt>file</tt>’ may be combined with ‘<tt>subst</tt>’, in which case the completer
will not add a space to words generated from the expansion of a
substitution of the form ‘<tt>$(</tt><var>...</var><tt>)</tt>’ or ‘<tt>${</tt><var>...</var><tt>}</tt>’.
</p>
<p>The <tt>_prefix</tt> completer uses this style as a simple boolean value
to decide if a space should be inserted before the suffix.
</p>
<a name="index-ambiguous_002c-completion-style"></a>
</dd>
<dt><tt>ambiguous</tt></dt>
<dd><p>This applies when completing non-final components of filename paths, in
other words those with a trailing slash. If it is set, the cursor is
left after the first ambiguous component, even if menu completion is in
use. The style is always tested with the <tt>paths</tt> tag.
</p>
<a name="index-assign_002dlist_002c-completion-style"></a>
</dd>
<dt><tt>assign-list</tt></dt>
<dd><p>When completing after an equals sign that is being treated as an
assignment, the completion system normally completes only one filename.
In some cases the value may be a list of filenames separated by colons,
as with <tt>PATH</tt> and similar parameters. This style can be set to a
list of patterns matching the names of such parameters.
</p>
<p>The default is to complete lists when the word on the line already
contains a colon.
</p>
<a name="index-auto_002ddescription_002c-completion-style"></a>
</dd>
<dt><tt>auto-description</tt></dt>
<dd><p>If set, this style’s value will be used as the description for options that
are not described by the completion functions, but that have exactly
one argument. The sequence ‘<tt>%d</tt>’ in the value will be replaced by
the description for this argument. Depending on personal preferences,
it may be useful to set this style to something like ‘<tt>specify: %d</tt>’.
Note that this may not work for some commands.
</p>
<a name="index-avoid_002dcompleter_002c-completion-style"></a>
</dd>
<dt><tt>avoid-completer</tt></dt>
<dd><p>This is used by the <tt>_all_matches</tt> completer to decide if the string
consisting of all matches should be added to the list currently being
generated. Its value is a list of names of completers. If any of
these is the name of the completer that generated the matches in this
completion, the string will not be added.
</p>
<p>The default value for this style is ‘<tt>_expand _old_list _correct
_approximate</tt>’, i.e. it contains the completers for which a string
with all matches will almost never be wanted.
</p>
<a name="index-cache_002dpath_002c-completion-style"></a>
</dd>
<dt><tt>cache-path</tt></dt>
<dd><p>This style defines the path where any cache files containing dumped
completion data are stored. It defaults to ‘<tt>$ZDOTDIR/.zcompcache</tt>’, or
‘<tt>$HOME/.zcompcache</tt>’ if <tt>$ZDOTDIR</tt> is not defined. The completion
cache will not be used unless the <tt>use-cache</tt> style is set.
</p>
<a name="index-cache_002dpolicy_002c-completion-style"></a>
</dd>
<dt><tt>cache-policy</tt></dt>
<dd><p>This style defines the function that will be used to determine whether
a cache needs rebuilding. See the section on the <tt>_cache_invalid</tt>
function below.
</p>
<a name="index-call_002dcommand_002c-completion-style"></a>
</dd>
<dt><tt>call-command</tt></dt>
<dd><p>This style is used in the function for commands such as <tt>make</tt> and
<tt>ant</tt> where calling the command directly to generate matches suffers
problems such as being slow or, as in the case of <tt>make</tt> can
potentially cause actions in the makefile to be executed. If it is set
to ‘true’ the command is called to generate matches. The default value
of this style is ‘false’.
</p>
<a name="index-command_002c-completion-style"></a>
</dd>
<dt><tt>command</tt></dt>
<dd><p>In many places, completion functions need to call external commands to
generate the list of completions. This style can be used to override the
command that is called in some such cases. The elements of the value are
joined with spaces to form a command line to execute. The value can also
start with a hyphen, in which case the usual command will be added to the
end; this is most useful for putting ‘<tt>builtin</tt>’ or ‘<tt>command</tt>’ in
front to make sure the appropriate version of a command is called, for
example to avoid calling a shell function with the same name as an external
command.
</p>
<p>As an example, the completion function for process IDs uses this
style with the <tt>processes</tt> tag to generate the IDs to complete and
the list of processes to display (if the <tt>verbose</tt> style is ‘true’).
The list produced by the command should look like the output of the
<tt>ps</tt> command. The first line is not displayed, but is searched for
the string ‘<tt>PID</tt>’ (or ‘<tt>pid</tt>’) to find the position of the
process IDs in the following lines. If the line does not contain
‘<tt>PID</tt>’, the first numbers in each of the other lines are taken as the
process IDs to complete.
</p>
<p>Note that the completion function generally has to call the specified
command for each attempt to generate the completion list. Hence
care should be taken to specify only commands that take a short
time to run, and in particular to avoid any that may never terminate.
</p>
<a name="index-command_002dpath_002c-completion-style"></a>
</dd>
<dt><tt>command-path</tt></dt>
<dd><p>This is a list of directories to search for commands to complete. The
default for this style is the value of the special parameter <tt>path</tt>.
</p>
<a name="index-commands_002c-completion-style"></a>
</dd>
<dt><tt>commands</tt></dt>
<dd><p>This is used by the function completing sub-commands for the system
initialisation scripts (residing in <tt>/etc/init.d</tt> or somewhere not
too far away from that). Its values give the default commands to
complete for those commands for which the completion function isn’t
able to find them out automatically. The default for this style are
the two strings ‘<tt>start</tt>’ and ‘<tt>stop</tt>’.
</p>
<a name="index-complete_002c-completion-style"></a>
</dd>
<dt><tt>complete</tt></dt>
<dd><p>This is used by the <tt>_expand_alias</tt> function when invoked as a
bindable command. If set to ‘true’ and the word on the command
line is not the name of an alias, matching alias names will be
completed.
</p>
<a name="index-complete_002doptions_002c-completion-style"></a>
</dd>
<dt><tt>complete-options</tt></dt>
<dd><p>This is used by the completer for <tt>cd</tt>, <tt>chdir</tt> and <tt>pushd</tt>.
For these commands a <tt>-</tt> is used to introduce a directory stack entry
and completion of these is far more common than completing options.
Hence unless the value of this style is ‘true’ options will not be
completed, even after an initial <tt>-</tt>. If it is ‘true’, options will
be completed after an initial <tt>-</tt> unless there is a preceding
<tt>-</tt><tt>-</tt> on the command line.
</p>
<a name="index-completer_002c-completion-style"></a>
</dd>
<dt><tt>completer</tt></dt>
<dd><p>The strings given as the value of this style provide the names of the
completer functions to use. The available completer functions are
described in
<a href="#Control-Functions">Control Functions</a>.
</p>
<p>Each string may be either the name of a completer function or a string
of the form ‘<var>function</var><tt>:</tt><var>name</var>’. In the first case the
<var>completer</var> field of the context will contain the name of the
completer without the leading underscore and with all other
underscores replaced by hyphens. In the second case the
<var>function</var> is the name of the completer to call, but the context
will contain the user-defined <var>name</var> in the <var>completer</var> field of
the context. If the <var>name</var> starts with a hyphen, the string for the
context will be build from the name of the completer function as in
the first case with the <var>name</var> appended to it. For example:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' completer _complete _complete:-foo
</pre></div>
<p>Here, completion will call the <tt>_complete</tt> completer twice, once
using ‘<tt>complete</tt>’ and once using ‘<tt>complete-foo</tt>’ in the
<var>completer</var> field of the context. Normally, using the same
completer more than once only makes sense when used with the
‘<var>functions</var><tt>:</tt><var>name</var>’ form, because otherwise the context
name will be the same in all calls to the completer; possible
exceptions to this rule are the <tt>_ignored</tt> and <tt>_prefix</tt>
completers.
</p>
<p>The default value for this style is ‘<tt>_complete _ignored</tt>’:
only completion will be done, first using the <tt>ignored-patterns</tt> style
and the <tt>$fignore</tt> array and then without ignoring matches.
</p>
<a name="index-condition_002c-completion-style"></a>
</dd>
<dt><tt>condition</tt></dt>
<dd><p>This style is used by the <tt>_list</tt> completer function to decide if
insertion of matches should be delayed unconditionally. The default is
‘true’.
</p>
<a name="index-delimiters_002c-completion-style"></a>
</dd>
<dt><tt>delimiters</tt></dt>
<dd><p>This style is used when adding a delimiter for use with history
modifiers or glob qualifiers that have delimited arguments. It is
an array of preferred delimiters to add. Non-special characters are
preferred as the completion system may otherwise become confused.
The default list is <tt>:</tt>, <tt>+</tt>, <tt>/</tt>, <tt>-</tt>, <tt>%</tt>. The list
may be empty to force a delimiter to be typed.
</p>
<a name="index-disabled_002c-completion-style"></a>
</dd>
<dt><tt>disabled</tt></dt>
<dd><p>If this is set to ‘true’, the <tt>_expand_alias</tt> completer and bindable
command will try to expand disabled aliases, too. The default is
‘false’.
</p>
<a name="index-domains_002c-completion-style"></a>
</dd>
<dt><tt>domains</tt></dt>
<dd><p>A list of names of network domains for completion.
If this is not set, domain names will be taken from
the file <tt>/etc/resolv.conf</tt>.
</p>
<a name="index-environ_002c-completion-style"></a>
</dd>
<dt><tt>environ</tt></dt>
<dd><p>The environ style is used when completing for ‘<tt>sudo</tt>’. It is set to an
array of ‘<var>VAR</var><tt>=</tt><var>value</var>’ assignments to be exported into the
local environment before the completion for the target command is invoked.
</p><div class="example">
<pre class="example">zstyle ':completion:*:sudo::' environ \
PATH="/sbin:/usr/sbin:$PATH" HOME="/root"
</pre></div>
<a name="index-expand_002c-completion-style"></a>
</dd>
<dt><tt>expand</tt></dt>
<dd><p>This style is used when completing strings consisting of multiple
parts, such as path names.
</p>
<p>If one of its values is the string ‘<tt>prefix</tt>’, the partially typed
word from the line will be expanded as far as possible even if trailing
parts cannot be completed.
</p>
<p>If one of its values is the string ‘<tt>suffix</tt>’, matching names for
components after the first ambiguous one will also be added. This means
that the resulting string is the longest unambiguous string possible.
However, menu completion can be used to cycle through all matches.
</p>
<a name="index-fake_002c-completion-style"></a>
</dd>
<dt><tt>fake</tt></dt>
<dd><p>This style may be set for any completion context. It
specifies additional strings that will always be completed in that
context. The form of each string is ‘<var>value</var><tt>:</tt><var>description</var>’;
the colon and description may be omitted, but any literal colons in
<var>value</var> must be quoted with a backslash. Any <var>description</var>
provided is shown alongside the value in completion listings.
</p>
<p>It is important to use a sufficiently restrictive context when specifying
fake strings. Note that the styles <tt>fake-files</tt> and <tt>fake-parameters</tt>
provide additional features when completing files or parameters.
</p>
<a name="index-fake_002dalways_002c-completion-style"></a>
</dd>
<dt><tt>fake-always</tt></dt>
<dd><p>This works identically to the <tt>fake</tt> style except that
the <tt>ignored-patterns</tt> style is not applied to it. This makes it
possible to override a set of matches completely by setting the
ignored patterns to ‘<tt>*</tt>’.
</p>
<p>The following shows a way of supplementing any tag with arbitrary data, but
having it behave for display purposes like a separate tag. In this example
we use the features of the <tt>tag-order</tt> style to divide the
<tt>named-directories</tt> tag into two when performing completion with
the standard completer <tt>complete</tt> for arguments of <tt>cd</tt>. The tag
<tt>named-directories-normal</tt> behaves as normal, but the tag
<tt>named-directories-mine</tt> contains a fixed set of directories.
This has the effect of adding the match group ‘<tt>extra directories</tt>’ with
the given completions.
</p>
<div class="example">
<pre class="example">zstyle ':completion::complete:cd:*' tag-order \
'named-directories:-mine:extra\ directories
named-directories:-normal:named\ directories *'
zstyle ':completion::complete:cd:*:named-directories-mine' \
fake-always mydir1 mydir2
zstyle ':completion::complete:cd:*:named-directories-mine' \
ignored-patterns '*'
</pre></div>
<a name="index-fake_002dfiles_002c-completion-style"></a>
</dd>
<dt><tt>fake-files</tt></dt>
<dd><p>This style is used when completing files and looked up
without a tag. Its values are of the form
‘<var>dir</var><tt>:</tt><var>names...</var>’. This will add the <var>names</var> (strings
separated by spaces) as
possible matches when completing in the directory <var>dir</var>, even if no
such files really exist. The dir may be a pattern; pattern characters
or colons in <var>dir</var> should be quoted with a backslash to be treated
literally.
</p>
<p>This can be useful on systems that support special file systems whose
top-level pathnames can not be listed or generated with glob patterns.
It can also be used for directories for which one does not have read
permission.
</p>
<p>The pattern form can be used to add a certain ‘magic’ entry
to all directories on a particular file system.
</p>
<a name="index-fake_002dparameters_002c-completion-style"></a>
</dd>
<dt><tt>fake-parameters</tt></dt>
<dd><p>This is used by the completion function for parameter names.
Its values are names of parameters that might not yet be
set but should be completed nonetheless. Each name may also be
followed by a colon and a string specifying the type of the parameter
(like ‘<tt>scalar</tt>’, ‘<tt>array</tt>’ or ‘<tt>integer</tt>’). If the type is
given, the name will only be completed if parameters of that type are
required in the particular context. Names for which no type is
specified will always be completed.
</p>
<a name="index-file_002dlist_002c-completion-style"></a>
</dd>
<dt><tt>file-list</tt></dt>
<dd><p>This style controls whether files completed using the standard builtin
mechanism are to be listed with a long list similar to <tt>ls -l</tt>.
Note that this feature uses the shell module
<tt>zsh/stat</tt> for file information; this loads the builtin <tt>stat</tt>
which will replace any external <tt>stat</tt> executable. To avoid
this the following code can be included in an initialization file:
</p>
<div class="example">
<pre class="example">zmodload -i zsh/stat
disable stat
</pre></div>
<p>The style may either be set to a ‘true’ value (or ‘<tt>all</tt>’), or
one of the values ‘<tt>insert</tt>’ or ‘<tt>list</tt>’, indicating that files
are to be listed in long format in all circumstances, or when
attempting to insert a file name, or when listing file names
without attempting to insert one.
</p>
<p>More generally, the value may be an array of any of the above values,
optionally followed by <tt>=</tt><var>num</var>. If <var>num</var> is present it
gives the maximum number of matches for which long listing style
will be used. For example,
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' file-list list=20 insert=10
</pre></div>
<p>specifies that long format will be used when listing up to 20 files
or inserting a file with up to 10 matches (assuming a listing
is to be shown at all, for example on an ambiguous completion), else short
format will be used.
</p>
<div class="example">
<pre class="example">zstyle -e ':completion:*' file-list \
'(( ${+NUMERIC} )) && reply=(true)'
</pre></div>
<p>specifies that long format will be used any time a numeric argument is
supplied, else short format.
</p>
<a name="index-file_002dpatterns_002c-completion-style"></a>
</dd>
<dt><tt>file-patterns</tt></dt>
<dd><p>This is used by the standard function for completing filenames,
<tt>_files</tt>. If the style is unset up to three tags are offered,
‘<tt>globbed-files</tt>’,‘<tt>directories</tt>’ and ‘<tt>all-files</tt>’, depending on
the types of files expected by the caller of <tt>_files</tt>. The first two
(‘<tt>globbed-files</tt>’ and ‘<tt>directories</tt>’) are normally offered
together to make it easier to complete files in sub-directories.
</p>
<p>The <tt>file-patterns</tt> style provides alternatives to the default tags,
which are not used. Its value consists of elements of the form
‘<var>pattern</var><tt>:</tt><var>tag</var>’; each string may contain any number of
such specifications separated by spaces.
</p>
<p>The <var>pattern</var> is a pattern that is to be used to generate filenames.
Any occurrence of the sequence ‘<tt>%p</tt>’ is replaced by any
pattern(s)
passed by the function calling <tt>_files</tt>. Colons in the pattern must
be preceded by a backslash to make them distinguishable from the colon
before the <var>tag</var>. If more than one pattern is needed, the patterns
can be given inside braces, separated by commas.
</p>
<p>The <var>tag</var>s of all strings in the value will be offered by <tt>_files</tt>
and used when looking up other styles. Any <var>tag</var>s in the same
word will be offered at the same time and before later words.
If no ‘<tt>:</tt><var>tag</var>’ is given the ‘<tt>files</tt>’ tag will be used.
</p>
<p>The <var>tag</var> may also be followed by an optional second colon and a
description, which will be used for the ‘<tt>%d</tt>’ in the value of
the <tt>format</tt> style (if that is set) instead of the default
description supplied by the completion function. If the description
given here contains itself a ‘<tt>%d</tt>’, that is replaced with the
description supplied by the completion function.
</p>
<p>For example, to make the <tt>rm</tt> command first complete only names of
object files and then the names of all files if there is no matching
object file:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:rm:*:*' file-patterns \
'*.o:object-files' '%p:all-files'
</pre></div>
<p>To alter the default behaviour of file completion — offer files
matching a pattern and directories on the first attempt, then all files
— to offer only matching files on the first attempt, then directories,
and finally all files:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' file-patterns \
'%p:globbed-files' '*(-/):directories' '*:all-files'
</pre></div>
<p>This works even where there is no special pattern: <tt>_files</tt> matches
all files using the pattern ‘<tt>*</tt>’ at the first step and stops when it
sees this pattern. Note also it will never try a pattern more than once
for a single completion attempt.
</p>
<p>During the execution of completion functions, the <tt>EXTENDED_GLOB</tt>
option is in effect, so the characters ‘<tt>#</tt>’, ‘<tt>~</tt>’ and ‘<tt>^</tt>’ have
special meanings in the patterns.
</p>
<a name="index-file_002dsort_002c-completion-style"></a>
</dd>
<dt><tt>file-sort</tt></dt>
<dd><p>The standard filename completion function uses this style without a tag
to determine in which order the names should be listed; menu completion
will cycle through them in the same order. The possible
values are: ‘<tt>size</tt>’ to sort by the size of the file;
‘<tt>links</tt>’ to sort by the number of links to the file;
‘<tt>modification</tt>’ (or ‘<tt>time</tt>’ or ‘<tt>date</tt>’) to sort by the last
modification time; ‘<tt>access</tt>’ to sort by the last access time; and
‘<tt>inode</tt>’ (or ‘<tt>change</tt>’) to sort by the last inode change
time. If the style is set to any other value, or is unset, files will be
sorted alphabetically by name. If the value contains the string
‘<tt>reverse</tt>’, sorting is done in the opposite order. If the value
contains the string ‘<tt>follow</tt>’, timestamps are associated with the
targets of symbolic links; the default is to use the timestamps
of the links themselves.
</p>
<a name="index-filter_002c-completion-style"></a>
</dd>
<dt><tt>filter</tt></dt>
<dd><p>This is used by the LDAP plugin for e-mail address completion to specify
the attributes to match against when filtering entries. So for example, if
the style is set to ‘<tt>sn</tt>’, matching is done against surnames. Standard
LDAP filtering is used so normal completion matching is bypassed. If this
style is not set, the LDAP plugin is skipped. You may also need to set the
<tt>command</tt> style to specify how to connect to your LDAP server.
</p>
<a name="index-force_002dlist_002c-completion-style"></a>
</dd>
<dt><tt>force-list</tt></dt>
<dd><p>This forces a list of completions to be shown at any point where listing is
done, even in cases where the list would usually be suppressed.
For example, normally the list is only shown if
there are at least two different matches. By setting this style to
‘<tt>always</tt>’, the list will always be shown, even if there is only a
single match that will immediately be accepted. The style may also
be set to a number. In this case the list will be shown if there are
at least that many matches, even if they would all insert the same
string.
</p>
<p>This style is tested for the default tag as well as for each tag valid
for the current completion. Hence the listing can be forced only for
certain types of match.
</p>
<a name="index-format_002c-completion-style"></a>
</dd>
<dt><tt>format</tt></dt>
<dd><p>If this is set for the <tt>descriptions</tt> tag, its value is used as a
string to display above matches in completion lists. The sequence
‘<tt>%d</tt>’ in this string will be replaced with a short description of
what these matches are. This string may also contain the following
sequences to specify output attributes
(see <a href="Prompt-Expansion.html#Prompt-Expansion">Prompt Expansion</a>):
‘<tt>%B</tt>’, ‘<tt>%S</tt>’, ‘<tt>%U</tt>’, ‘<tt>%F</tt>’, ‘<tt>%K</tt>’ and their lower case
counterparts, as well as ‘<tt>%{</tt>...<tt>%}</tt>’. ‘<tt>%F</tt>’, ‘<tt>%K</tt>’ and
‘<tt>%{</tt>...<tt>%}</tt>’ take arguments in the same form as prompt
expansion. Note that the sequence ‘<tt>%G</tt>’ is not available; an argument
to ‘<tt>%{</tt>’ should be used instead.
</p>
<p>The style is tested with each tag valid for the current completion
before it is tested for the <tt>descriptions</tt> tag. Hence different format
strings can be defined for different types of match.
</p>
<p>Note also that some completer functions define additional
‘<tt>%</tt>’-sequences. These are described for the completer functions that
make use of them.
</p>
<p>Some completion functions display messages that may be customised by
setting this style for the <tt>messages</tt> tag. Here, the ‘<tt>%d</tt>’ is
replaced with a message given by the completion function.
</p>
<p>Finally, the format string is looked up with the <tt>warnings</tt> tag,
for use when no matches could be generated at all. In this case the
‘<tt>%d</tt>’ is replaced with the descriptions for the matches that were
expected separated by spaces. The sequence ‘<tt>%D</tt>’ is replaced with
the same descriptions separated by newlines.
</p>
<p>It is possible to use printf-style field width specifiers with ‘<tt>%d</tt>’
and similar escape sequences. This is handled by the <tt>zformat</tt>
builtin command from the <tt>zsh/zutil</tt> module, see
<a href="Zsh-Modules.html#The-zsh_002fzutil-Module">The zsh/zutil Module</a>.
</p>
<a name="index-glob_002c-completion-style"></a>
</dd>
<dt><tt>glob</tt></dt>
<dd><p>This is used by the <tt>_expand</tt> completer. If
it is set to ‘true’ (the default), globbing will be attempted on the
words resulting from a previous substitution (see the <tt>substitute</tt>
style) or else the original string from the line.
</p>
<a name="index-global_002c-completion-style"></a>
</dd>
<dt><tt>global</tt></dt>
<dd><p>If this is set to ‘true’ (the default), the <tt>_expand_alias</tt>
completer and bindable command will try to expand global aliases.
</p>
<a name="index-group_002dname_002c-completion-style"></a>
</dd>
<dt><tt>group-name</tt></dt>
<dd><p>The completion system can group different types of matches, which appear
in separate lists. This style can be used to give the names of groups
for particular tags. For example, in command position the completion
system generates names of builtin and external commands, names of
aliases, shell functions and parameters and reserved words as possible
completions. To have the external commands and shell functions listed
separately:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:-command-:*:commands' \
group-name commands
zstyle ':completion:*:*:-command-:*:functions' \
group-name functions
</pre></div>
<p>As a consequence, any match with the same tag will be displayed in the
same group.
</p>
<p>If the name given is the empty string the name of the tag for
the matches will be used as the name of the group. So, to have all
different types of matches displayed separately, one can just set:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' group-name ''
</pre></div>
<p>All matches for which no group name is defined will be put in a group
named <tt>-default-</tt>.
</p>
<a name="index-group_002dorder_002c-completion-style"></a>
</dd>
<dt><tt>group-order</tt></dt>
<dd><p>This style is additional to the <tt>group-name</tt> style to specify the
order for display of the groups defined by that style (compare <tt>tag-order</tt>,
which determines which completions appear at all). The groups named
are shown in the given order; any other groups
are shown in the order defined by the completion function.
</p>
<p>For example, to have names of builtin commands, shell functions and
external commands appear in that order when completing in command
position:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:-command-:*:*' group-order \
builtins functions commands
</pre></div>
<a name="index-groups_002c-completion-style"></a>
</dd>
<dt><tt>groups</tt></dt>
<dd><p>A list of names of UNIX groups. If this is not set,
group names are taken from the YP database or the file ‘<tt>/etc/group</tt>’.
</p>
<a name="index-hidden_002c-completion-style"></a>
</dd>
<dt><tt>hidden</tt></dt>
<dd><p>If this is set to ‘true’, matches for the given context
will not be listed, although
any description for the matches set with the <tt>format</tt> style will be
shown. If it is set to ‘<tt>all</tt>’, not even the description will be
displayed.
</p>
<p>Note that the matches will still be completed; they are just not shown
in the list. To avoid having matches considered as possible
completions at all, the <tt>tag-order</tt> style can be modified as described
below.
</p>
<a name="index-hosts_002c-completion-style"></a>
</dd>
<dt><tt>hosts</tt></dt>
<dd><p>A list of names of hosts that should be completed. If this is not set,
hostnames are taken from the file ‘<tt>/etc/hosts</tt>’.
</p>
<a name="index-hosts_002dports_002c-completion-style"></a>
</dd>
<dt><tt>hosts-ports</tt></dt>
<dd><p>This style is used by commands that need or accept hostnames and
network ports. The strings in the value should be of the form
‘<var>host</var><tt>:</tt><var>port</var>’. Valid ports are determined by the presence
of hostnames; multiple ports for the same host may appear.
</p>
<a name="index-ignore_002dline_002c-completion-style"></a>
</dd>
<dt><tt>ignore-line</tt></dt>
<dd><p>This is tested for each tag valid for the current completion. If
it is set to ‘true’, none of the words that are already on the line
will be considered as possible completions. If it is set to
‘<tt>current</tt>’, the word the cursor is on will not be considered as a
possible completion. The value ‘<tt>current-shown</tt>’ is similar but only
applies if the list of completions is currently shown on the screen.
Finally, if the style is set to ‘<tt>other</tt>’, all words on the line except
for the current one will be excluded from the possible completions.
</p>
<p>The values ‘<tt>current</tt>’ and ‘<tt>current-shown</tt>’ are a bit like the
opposite of the <tt>accept-exact</tt> style: only strings with
missing characters will be completed.
</p>
<p>Note that you almost certainly don’t want to set this to ‘true’ or
‘<tt>other</tt>’ for a general
context such as ‘<tt>:completion:*</tt>’. This is because it would disallow
completion of, for example, options multiple times even if the command
in question accepts the option more than once.
</p>
<a name="index-ignore_002dparents_002c-completion-style"></a>
</dd>
<dt><tt>ignore-parents</tt></dt>
<dd><p>The style is tested without a tag by the function completing pathnames
in order to determine whether to ignore
the names of directories already mentioned in the current word, or the
name of the current working directory. The value must include one or both
of the following strings:
</p>
<dl compact="compact">
<dt><tt>parent</tt></dt>
<dd><p>The name of any directory whose path is already contained in the word on
the line is ignored. For example, when completing after <tt>foo/../</tt>, the
directory <tt>foo</tt> will not be considered a valid completion.
</p>
</dd>
<dt><tt>pwd</tt></dt>
<dd><p>The name of the current working directory will not be completed; hence,
for example, completion after <tt>../</tt> will not use the name of the current
directory.
</p>
</dd>
</dl>
<p>In addition, the value may include one or both of:
</p>
<dl compact="compact">
<dt><tt>..</tt></dt>
<dd><p>Ignore the specified directories only when the word on the line contains
the substring ‘<tt>../</tt>’.
</p>
</dd>
<dt><tt>directory</tt></dt>
<dd><p>Ignore the specified directories only when names of directories are
completed, not when completing names of files.
</p>
</dd>
</dl>
<p>Excluded values act in a similar fashion to values of the
<tt>ignored-patterns</tt> style, so they can be restored to consideration by
the <tt>_ignored</tt> completer.
</p>
<a name="index-extra_002dverbose_002c-completion-style"></a>
</dd>
<dt><tt>extra-verbose</tt></dt>
<dd><p>If set, the completion listing is more verbose at the cost of
a probable decrease in completion speed. Completion performance
will suffer if this style is set to ‘true’.
</p>
<a name="index-ignored_002dpatterns_002c-completion-style"></a>
</dd>
<dt><tt>ignored-patterns</tt></dt>
<dd><p>A list of patterns; any trial completion matching one of the patterns
will be excluded from consideration. The
<tt>_ignored</tt> completer can appear in the list of completers to
restore the ignored matches. This is a more configurable
version of the shell parameter <tt>$fignore</tt>.
</p>
<p>Note that the
<tt>EXTENDED_GLOB</tt> option is set during the execution of completion
functions, so the characters ‘<tt>#</tt>’, ‘<tt>~</tt>’ and ‘<tt>^</tt>’ have special
meanings in the patterns.
</p>
<a name="index-insert_002c-completion-style"></a>
</dd>
<dt><tt>insert</tt></dt>
<dd><p>This style is used by the <tt>_all_matches</tt> completer to decide whether to
insert the list of all matches unconditionally instead of adding the
list as another match.
</p>
<a name="index-insert_002dids_002c-completion-style"></a>
</dd>
<dt><tt>insert-ids</tt></dt>
<dd><p>When completing process IDs, for example as arguments to the <tt>kill</tt> and
<tt>wait</tt> builtins the name of a
command may be converted to the appropriate process ID. A problem
arises when the process name typed is not unique. By default (or if this
style is set explicitly to ‘<tt>menu</tt>’) the name will be converted
immediately to a set of possible IDs, and menu completion will be started
to cycle through them.
</p>
<p>If the value of the style is ‘<tt>single</tt>’,
the shell will wait until the user has typed enough to make the command
unique before converting the name to an ID; attempts at completion will
be unsuccessful until that point. If the value is any other
string, menu completion will be started when the string typed by the
user is longer than the common prefix to the corresponding IDs.
</p>
<a name="index-insert_002dtab_002c-completion-style"></a>
</dd>
<dt><tt>insert-tab</tt></dt>
<dd><p>If this is set to ‘true’, the completion system will
insert a TAB character (assuming that was used to start completion) instead
of performing completion when there is no non-blank character to the left
of the cursor. If it is set to ‘false’, completion will be done even there.
</p>
<p>The value may also contain the substrings ‘<tt>pending</tt>’ or
‘<tt>pending=</tt><var>val</var>’. In this case, the typed character will be
inserted instead of starting completion when there is unprocessed input
pending. If a <var>val</var> is given, completion will not be done if there
are at least that many characters of unprocessed input. This is often
useful when pasting characters into a terminal. Note
however, that it relies on the <tt>$PENDING</tt> special parameter from the
<tt>zsh/zle</tt> module being set properly which is not guaranteed on all
platforms.
</p>
<p>The default value of this style is ‘true’ except for completion within
<tt>vared</tt> builtin command where it is ‘false’.
</p>
<a name="index-insert_002dunambiguous_002c-completion-style"></a>
</dd>
<dt><tt>insert-unambiguous</tt></dt>
<dd><p>This is used by the <tt>_match</tt> and <tt>_approximate</tt> completers.
These completers are often used with menu completion since the word typed
may bear little resemblance to the final completion.
However, if this style is ‘true’, the completer will start menu
completion only if it could find no unambiguous initial string at
least as long as the original string typed by the user.
</p>
<p>In the case of the <tt>_approximate</tt> completer, the completer
field in the context will already have been set to one of
<tt>correct-</tt><var>num</var> or <tt>approximate-</tt><var>num</var>, where <var>num</var> is the
number of errors that were accepted.
</p>
<p>In the case of the <tt>_match</tt> completer, the style may also be set to
the string ‘<tt>pattern</tt>’. Then the pattern on the line is left
unchanged if it does not match unambiguously.
</p>
<a name="index-keep_002dprefix_002c-completion-style"></a>
</dd>
<dt><tt>keep-prefix</tt></dt>
<dd><p>This style is used by the <tt>_expand</tt> completer. If it is ‘true’, the
completer will try to keep a prefix containing a tilde or parameter
expansion. Hence, for example, the string ‘<tt>~/f*</tt>’ would be expanded to
‘<tt>~/foo</tt>’ instead of ‘<tt>/home/user/foo</tt>’. If the style is set to
‘<tt>changed</tt>’ (the default), the prefix will only be left unchanged if
there were other changes between the expanded words and the original
word from the command line. Any other value forces the prefix to be
expanded unconditionally.
</p>
<p>The behaviour of <tt>_expand</tt> when this style is ‘true’ is to cause <tt>_expand</tt>
to give up when a single expansion with the restored prefix is the same
as the original; hence any remaining completers may be called.
</p>
<a name="index-last_002dprompt_002c-completion-style"></a>
</dd>
<dt><tt>last-prompt</tt></dt>
<dd><p>This is a more flexible form of the <tt>ALWAYS_LAST_PROMPT</tt> option.
If it is ‘true’, the completion system will try to return the cursor to
the previous command line after displaying a completion list. It is
tested for all tags valid for the current completion, then the
<tt>default</tt> tag. The cursor will be moved back to the
previous line if this style is ‘true’ for all types of match. Note
that unlike the <tt>ALWAYS_LAST_PROMPT</tt> option this is independent of the
numeric argument.
</p>
<a name="index-known_002dhosts_002dfiles"></a>
</dd>
<dt><tt>known-hosts-files</tt></dt>
<dd><p>This style should contain a list of files to search for host names and
(if the <tt>use-ip</tt> style is set) IP addresses in a format compatible with
ssh <tt>known_hosts</tt> files. If it is not set, the files
<tt>/etc/ssh/ssh_known_hosts</tt> and <tt>~/.ssh/known_hosts</tt> are used.
</p>
<a name="index-list_002c-completion-style"></a>
</dd>
<dt><tt>list</tt></dt>
<dd><p>This style is used by the <tt>_history_complete_word</tt> bindable command.
If it is set to ‘true’ it has no effect. If it is set to ‘false’
matches will not be listed. This overrides the setting of the options
controlling listing behaviour, in particular <tt>AUTO_LIST</tt>. The context
always starts with ‘<tt>:completion:history-words</tt>’.
</p>
<a name="index-list_002dcolors_002c-completion-style"></a>
</dd>
<dt><tt>list-colors</tt></dt>
<dd><p>If the <tt>zsh/complist</tt> module is loaded, this style can be used to set
color specifications. This mechanism replaces the use of the
<tt>ZLS_COLORS</tt> and <tt>ZLS_COLOURS</tt> parameters described in
<a href="Zsh-Modules.html#The-zsh_002fcomplist-Module">The zsh/complist Module</a>, but the syntax is the same.
</p>
<p>If this style is set for the <tt>default</tt> tag, the strings in the value
are taken as specifications that are to be used everywhere. If it is
set for other tags, the specifications are used only for matches of
the type described by the tag. For this to work best, the <tt>group-name</tt>
style must be set to an empty string.
</p>
<p>In addition to setting styles for specific tags, it is also possible to
use group names specified explicitly by the <tt>group-name</tt> tag together
with the ‘<tt>(group)</tt>’ syntax allowed by the <tt>ZLS_COLORS</tt> and
<tt>ZLS_COLOURS</tt> parameters and simply using the <tt>default</tt> tag.
</p>
<p>It is possible to use any color specifications already set up for the GNU
version of the <tt>ls</tt> command:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:default' list-colors \
${(s.:.)LS_COLORS}
</pre></div>
<p>The default colors are the same as for the GNU <tt>ls</tt> command and can be
obtained by setting the style to an empty string (i.e. <tt>''</tt>).
</p>
<a name="index-list_002ddirs_002dfirst_002c-completion-style"></a>
</dd>
<dt><tt>list-dirs-first</tt></dt>
<dd><p>This is used by file completion. If set, directories to be completed
are listed separately from and before completion for other files,
regardless of tag ordering. In addition, the tag <tt>other-files</tt>
is used in place of <tt>all-files</tt> for the remaining files, to indicate
that no directories are presented with that tag.
</p>
<a name="index-list_002dgrouped_002c-completion-style"></a>
</dd>
<dt><tt>list-grouped</tt></dt>
<dd><p>If this style is ‘true’ (the default), the completion system will try to
make certain completion listings more compact by grouping matches.
For example, options for commands that have the same description (shown
when the <tt>verbose</tt> style is set to ‘true’) will appear as a single
entry. However, menu selection can be used to cycle through all the
matches.
</p>
<a name="index-list_002dpacked_002c-completion-style"></a>
</dd>
<dt><tt>list-packed</tt></dt>
<dd><p>This is tested for each tag valid in the current context as well as the
<tt>default</tt> tag. If it is set to ‘true’, the corresponding matches
appear in listings as if the <tt>LIST_PACKED</tt> option were set. If it is
set to ‘false’, they are listed normally.
</p>
<a name="index-list_002dprompt_002c-completion-style"></a>
</dd>
<dt><tt>list-prompt</tt></dt>
<dd><p>If this style is set for the <tt>default</tt> tag,
completion lists that don’t fit on the screen can be scrolled (see
<a href="Zsh-Modules.html#The-zsh_002fcomplist-Module">The zsh/complist Module</a>). The value, if not the empty string, will be displayed after every
screenful and the shell will prompt for a key press; if the style is
set to the empty string,
a default prompt will be used.
</p>
<p>The value may contain the escape sequences:
‘<tt>%l</tt>’ or ‘<tt>%L</tt>’, which will be replaced by the number of the last line
displayed and the total number of lines; ‘<tt>%m</tt>’ or ‘<tt>%M</tt>’,
the number of the last match shown and the total number of
matches; and ‘<tt>%p</tt>’ and ‘<tt>%P</tt>’, ‘<tt>Top</tt>’
when at the beginning of the list, ‘<tt>Bottom</tt>’ when at the end and the
position shown as a percentage of the total length otherwise. In each
case the form with the uppercase letter will be replaced by a string of fixed
width, padded to the right with spaces, while the lowercase form will
be replaced by a variable width string. As in other prompt strings, the
escape sequences ‘<tt>%S</tt>’, ‘<tt>%s</tt>’, ‘<tt>%B</tt>’, ‘<tt>%b</tt>’, ‘<tt>%U</tt>’,
‘<tt>%u</tt>’ for entering and leaving the display modes
standout, bold and underline, and ‘<tt>%F</tt>’, ‘<tt>%f</tt>’, ‘<tt>%K</tt>’, ‘<tt>%k</tt>’ for
changing the foreground background colour, are also available, as is the form
‘<tt>%{</tt>...<tt>%}</tt>’ for enclosing escape sequences which display with zero
(or, with a numeric argument, some other) width.
</p>
<p>After deleting this prompt the variable <tt>LISTPROMPT</tt> should be unset for
the removal to take effect.
</p>
<a name="index-list_002drows_002dfirst_002c-completion-style"></a>
</dd>
<dt><tt>list-rows-first</tt></dt>
<dd><p>This style is tested in the same way as the <tt>list-packed</tt> style and
determines whether matches are to be listed in a rows-first fashion as
if the <tt>LIST_ROWS_FIRST</tt> option were set.
</p>
<a name="index-list_002dsuffixes_002c-completion-style"></a>
</dd>
<dt><tt>list-suffixes</tt></dt>
<dd><p>This style is used by the function that completes filenames. If it is
‘true’, and completion is attempted on a string containing multiple partially
typed pathname components, all ambiguous components will be shown.
Otherwise, completion stops at the first ambiguous component.
</p>
<a name="index-list_002dseparator_002c-completion-style"></a>
</dd>
<dt><tt>list-separator</tt></dt>
<dd><p>The value of this style is used in completion listing to separate the
string to complete from a description when possible (e.g. when
completing options). It defaults to ‘<tt>-</tt><tt>-</tt>’ (two hyphens).
</p>
<a name="index-local_002c-completion-style"></a>
</dd>
<dt><tt>local</tt></dt>
<dd><p>This is for use with functions that complete URLs for which the
corresponding files are available directly from the file system.
Its value should consist of three strings: a
hostname, the path to the default web pages for the server, and the
directory name used by a user placing web pages within their home
area.
</p>
<p>For example:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' local toast \
/var/http/public/toast public_html
</pre></div>
<p>Completion after ‘<tt>http://toast/stuff/</tt>’ will look for files in the
directory <tt>/var/http/public/toast/stuff</tt>, while completion after
‘<tt>http://toast/~yousir/</tt>’ will look for files in the directory
<tt>~yousir/public_html</tt>.
</p>
<a name="index-mail_002ddirectory_002c-completion-style"></a>
</dd>
<dt><tt>mail-directory</tt></dt>
<dd><p>If set, zsh will assume that mailbox files can be found in
the directory specified. It defaults to ‘<tt>~/Mail</tt>’.
</p>
<a name="index-match_002doriginal_002c-completion-style"></a>
</dd>
<dt><tt>match-original</tt></dt>
<dd><p>This is used by the <tt>_match</tt> completer. If it is set to
<tt>only</tt>, <tt>_match</tt> will try to generate matches without inserting a
‘<tt>*</tt>’ at the cursor position. If set to any other non-empty value,
it will first try to generate matches without inserting the ‘<tt>*</tt>’
and if that yields no matches, it will try again with the ‘<tt>*</tt>’
inserted. If it is unset or set to the empty string, matching will
only be performed with the ‘<tt>*</tt>’ inserted.
</p>
<a name="index-matcher_002c-completion-style"></a>
</dd>
<dt><tt>matcher</tt></dt>
<dd><p>This style is tested separately for each tag valid in the current
context. Its value is tried before any match specifications given by the
<tt>matcher-list</tt> style. It should be in the form described in
<a href="Completion-Widgets.html#Completion-Matching-Control">Completion Matching Control</a>. For examples of this, see the description of the <tt>tag-order</tt> style.
</p>
<a name="index-matcher_002dlist_002c-completion-style"></a>
</dd>
<dt><tt>matcher-list</tt></dt>
<dd><p>This style can be set to a list of match specifications that are to
be applied everywhere. Match specifications are described in
<a href="Completion-Widgets.html#Completion-Matching-Control">Completion Matching Control</a>.
The completion system will try them one after another for each completer
selected. For example, to try first simple completion and, if that
generates no matches, case-insensitive completion:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' matcher-list '' 'm:{a-zA-Z}={A-Za-z}'
</pre></div>
<p>By default each specification replaces the previous one; however, if a
specification is prefixed with <tt>+</tt>, it is added to the existing list.
Hence it is possible to create increasingly general specifications
without repetition:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' matcher-list \
'' '+m:{a-z}={A-Z}' '+m:{A-Z}={a-z}'
</pre></div>
<p>It is possible to create match specifications valid for particular
completers by using the third field of the context. This applies only
to completers that override the global matcher-list, which as of this
writing includes only <tt>_prefix</tt> and <tt>_ignored</tt>. For example, to
use the completers <tt>_complete</tt> and <tt>_prefix</tt> but allow
case-insensitive completion only with <tt>_complete</tt>:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' completer _complete _prefix
zstyle ':completion:*:complete:*:*:*' matcher-list \
'' 'm:{a-zA-Z}={A-Za-z}'
</pre></div>
<p>User-defined names, as explained for the <tt>completer</tt> style, are
available. This makes it possible to try the same completer more than
once with different match specifications each time. For example, to try
normal completion without a match specification, then normal completion
with case-insensitive matching, then correction, and finally
partial-word completion:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' completer \
_complete _correct _complete:foo
zstyle ':completion:*:complete:*:*:*' matcher-list \
'' 'm:{a-zA-Z}={A-Za-z}'
zstyle ':completion:*:foo:*:*:*' matcher-list \
'm:{a-zA-Z}={A-Za-z} r:|[-_./]=* r:|=*'
</pre></div>
<p>If the style is unset in any context no match specification is applied.
Note also that some completers such as <tt>_correct</tt> and <tt>_approximate</tt>
do not use the match specifications at all, though these completers will
only ever be called once even if the <tt>matcher-list</tt> contains more than
one element.
</p>
<p>Where multiple specifications are useful, note that the <em>entire</em>
completion is done for each element of <tt>matcher-list</tt>, which can
quickly reduce the shell’s performance. As a rough rule of thumb,
one to three strings will give acceptable performance. On the other
hand, putting multiple space-separated values into the same string does
not have an appreciable impact on performance.
</p>
<p>If there is no current matcher or it is empty, and the option
<tt>NO_CASE_GLOB</tt> is in effect, the matching for files is performed
case-insensitively in any case. However, any matcher must
explicitly specify case-insensitive matching if that is required.
</p>
<a name="index-max_002derrors_002c-completion-style"></a>
</dd>
<dt><tt>max-errors</tt></dt>
<dd><p>This is used by the <tt>_approximate</tt> and <tt>_correct</tt> completer functions
to determine the maximum number of errors to allow. The completer will try
to generate completions by first allowing one error, then two errors, and
so on, until either a match or matches were found or the maximum number of
errors given by this style has been reached.
</p>
<p>If the value for this style contains the string ‘<tt>numeric</tt>’, the
completer function will take any numeric argument as the
maximum number of errors allowed. For example, with
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:approximate:::' max-errors 2 numeric
</pre></div>
<p>two errors are allowed if no numeric argument is given, but with
a numeric argument of six (as in ‘<tt>ESC-6 TAB</tt>’), up to six
errors are accepted. Hence with a value of ‘<tt>0 numeric</tt>’, no correcting
completion will be attempted unless a numeric argument is given.
</p>
<p>If the value contains the string ‘<tt>not-numeric</tt>’, the completer
will <em>not</em> try to generate corrected
completions when given a numeric argument, so in this case the number given
should be greater than zero. For example, ‘<tt>2 not-numeric</tt>’ specifies that
correcting completion with two errors will usually be performed, but if a
numeric argument is given, correcting completion will not be
performed.
</p>
<p>The default value for this style is ‘<tt>2 numeric</tt>’.
</p>
<a name="index-max_002dmatches_002dwidth_002c-completion-style"></a>
</dd>
<dt><tt>max-matches-width</tt></dt>
<dd><p>This style is used to determine the trade off between the width of the
display used for matches and the width used for their descriptions when
the <tt>verbose</tt> style is in effect. The value gives the number of
display columns to reserve for the matches. The default is half the
width of the screen.
</p>
<p>This has the most impact when several matches have the
same description and so will be grouped together. Increasing the style
will allow more matches to be grouped together; decreasing it will allow
more of the description to be visible.
</p>
<a name="index-menu_002c-completion-style"></a>
</dd>
<dt><tt>menu</tt></dt>
<dd><p>If this is ‘true’ in the context of any of the tags defined
for the current completion menu completion will be used. The value for
a specific tag will take precedence over that for the ‘<tt>default</tt>’ tag.
</p>
<p>If none of the values found in this way is ‘true’ but at least
one is set to ‘<tt>auto</tt>’, the shell behaves as if the <tt>AUTO_MENU</tt>
option is set.
</p>
<p>If one of the values is explicitly set to ‘false’, menu
completion will be explicitly turned off, overriding the
<tt>MENU_COMPLETE</tt> option and other settings.
</p>
<p>In the form ‘<tt>yes=</tt><var>num</var>’, where ‘<tt>yes</tt>’ may be any of the
‘true’ values (‘<tt>yes</tt>’, ‘<tt>true</tt>’, ‘<tt>on</tt>’ and ‘<tt>1</tt>’),
menu completion will be turned on if there are at least <var>num</var> matches.
In the form ‘<tt>yes=long</tt>’, menu completion will be turned on
if the list does not fit on the screen. This does not activate menu
completion if the widget normally only lists completions, but menu
completion can be activated in that case with the value ‘<tt>yes=long-list</tt>’
(Typically, the value ‘<tt>select=long-list</tt>’ described later is more
useful as it provides control over scrolling.)
</p>
<p>Similarly, with any of the ‘false’ values (as in ‘<tt>no=10</tt>’), menu
completion will <em>not</em> be used if there are <var>num</var> or more matches.
</p>
<p>The value of this widget also controls menu selection, as implemented by
the <tt>zsh/complist</tt> module. The following values may appear either
alongside or instead of the values above.
</p>
<p>If the value contains the string ‘<tt>select</tt>’, menu selection
will be started unconditionally.
</p>
<p>In the form ‘<tt>select=</tt><var>num</var>’, menu selection will only be started if
there are at least <var>num</var> matches. If the values for more than one
tag provide a number, the smallest number is taken.
</p>
<p>Menu selection can be turned off explicitly by defining a value
containing the string‘<tt>no-select</tt>’.
</p>
<p>It is also possible to start menu selection only if the list of
matches does not fit on the screen by using the value
‘<tt>select=long</tt>’. To start menu selection even if the current widget
only performs listing, use the value ‘<tt>select=long-list</tt>’.
</p>
<p>To turn on menu completion or menu selection when a there are a certain
number of matches <em>or</em> the list of matches does not fit on the
screen, both of ‘<tt>yes=</tt>’ and ‘<tt>select=</tt>’ may be given twice, once
with a number and once with ‘<tt>long</tt>’ or ‘<tt>long-list</tt>’.
</p>
<p>Finally, it is possible to activate two special modes of menu selection.
The word ‘<tt>interactive</tt>’ in the value causes interactive mode
to be entered immediately when menu selection is started; see
<a href="Zsh-Modules.html#The-zsh_002fcomplist-Module">The zsh/complist Module</a>
for a description of interactive mode. Including the string
‘<tt>search</tt>’ does the same for incremental search mode. To select backward
incremental search, include the string ‘<tt>search-backward</tt>’.
</p>
<a name="index-muttrc_002c-completion-style"></a>
</dd>
<dt><tt>muttrc</tt></dt>
<dd><p>If set, gives the location of the mutt configuration file. It defaults
to ‘<tt>~/.muttrc</tt>’.
</p>
<a name="index-numbers_002c-completion-style"></a>
</dd>
<dt><tt>numbers</tt></dt>
<dd><p>This is used with the <tt>jobs</tt> tag. If it is ‘true’, the shell will
complete job numbers instead of the shortest unambiguous prefix
of the job command text. If the value is a number, job numbers will
only be used if that many words from the job descriptions are required to
resolve ambiguities. For example, if the value is ‘<tt>1</tt>’, strings will
only be used if all jobs differ in the first word on their command lines.
</p>
<a name="index-old_002dlist_002c-completion-style"></a>
</dd>
<dt><tt>old-list</tt></dt>
<dd><p>This is used by the <tt>_oldlist</tt> completer. If it is set to ‘<tt>always</tt>’,
then standard widgets which perform listing will retain the current list of
matches, however they were generated; this can be turned off explicitly
with the value ‘<tt>never</tt>’, giving the behaviour without the <tt>_oldlist</tt>
completer. If the style is unset, or any other value, then the existing
list of completions is displayed if it is not already; otherwise, the
standard completion list is generated; this is the default behaviour of
<tt>_oldlist</tt>. However, if there is an old list and this style contains
the name of the completer function that generated the list, then the
old list will be used even if it was generated by a widget which does
not do listing.
</p>
<p>For example, suppose you type <tt>^Xc</tt> to use the <tt>_correct_word</tt>
widget, which generates a list of corrections for the word under the
cursor. Usually, typing <tt>^D</tt> would generate a standard list of
completions for the word on the command line, and show that. With
<tt>_oldlist</tt>, it will instead show the list of corrections already
generated.
</p>
<p>As another example consider the <tt>_match</tt> completer: with the
<tt>insert-unambiguous</tt> style set to ‘true’ it inserts only a common prefix
string, if there is any. However, this may remove parts of the original
pattern, so that further completion could produce more matches than on the
first attempt. By using the <tt>_oldlist</tt> completer and setting this style
to <tt>_match</tt>, the list of matches generated on the first attempt will be
used again.
</p>
<a name="index-old_002dmatches_002c-completion-style"></a>
</dd>
<dt><tt>old-matches</tt></dt>
<dd><p>This is used by the <tt>_all_matches</tt> completer to decide if an old
list of matches should be used if one exists. This is selected by one of
the ‘true’ values or by the string ‘<tt>only</tt>’. If
the value is ‘<tt>only</tt>’, <tt>_all_matches</tt> will only use an old list
and won’t have any effect on the list of matches currently being
generated.
</p>
<p>If this style is set it is generally unwise to call the <tt>_all_matches</tt>
completer unconditionally. One possible use is for either this style or
the <tt>completer</tt> style to be defined with the <tt>-e</tt> option to
<tt>zstyle</tt> to make the style conditional.
</p>
<a name="index-old_002dmenu_002c-completion-style"></a>
</dd>
<dt><tt>old-menu</tt></dt>
<dd><p>This is used by the <tt>_oldlist</tt> completer. It controls how menu
completion behaves when a completion has already been inserted and the
user types a standard completion key such as <tt>TAB</tt>. The default
behaviour of <tt>_oldlist</tt> is that menu completion always continues
with the existing list of completions. If this style is set to
‘false’, however, a new completion is started if the old list was
generated by a different completion command; this is the behaviour without
the <tt>_oldlist</tt> completer.
</p>
<p>For example, suppose you type <tt>^Xc</tt> to generate a list of corrections,
and menu completion is started in one of the usual ways. Usually, or with
this style set to ‘false’, typing <tt>TAB</tt> at this point would start
trying to complete the line as it now appears. With <tt>_oldlist</tt>, it
instead continues to cycle through the list of corrections.
</p>
<a name="index-original_002c-completion-style"></a>
</dd>
<dt><tt>original</tt></dt>
<dd><p>This is used by the <tt>_approximate</tt> and <tt>_correct</tt>
completers to decide if the original string should be added as
a possible completion. Normally, this is done only if there are
at least two possible corrections, but if this style is set to ‘true’, it
is always added. Note that the style will be examined with the
completer field in the context name set to <tt>correct-</tt><var>num</var> or
<tt>approximate-</tt><var>num</var>, where <var>num</var> is the number of errors that
were accepted.
</p>
<a name="index-packageset_002c-completion-style"></a>
</dd>
<dt><tt>packageset</tt></dt>
<dd><p>This style is used when completing arguments of the Debian ‘<tt>dpkg</tt>’
program. It contains an override for the default package set
for a given context. For example,
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:complete:dpkg:option--status-1:*' \
packageset avail
</pre></div>
<p>causes available packages, rather than only installed packages,
to be completed for ‘<tt>dpkg -</tt><tt>-status</tt>’.
</p>
<a name="index-path_002c-completion-style"></a>
</dd>
<dt><tt>path</tt></dt>
<dd><p>The function that completes color names uses this style with the
<tt>colors</tt> tag. The value should be the pathname of a file
containing color names in the format of an X11 <tt>rgb.txt</tt> file. If
the style is not set but this file is found in one of various standard
locations it will be used as the default.
</p>
<a name="index-path_002dcompletion_002c-completion-style"></a>
</dd>
<dt><tt>path-completion</tt></dt>
<dd><p>This is used by filename completion. By default, filename completion
examines all components of a path to see if there are completions of
that component. For example, <tt>/u/b/z</tt> can be completed to
<tt>/usr/bin/zsh</tt>. Explicitly setting this style to ‘false’ inhibits this
behaviour for path components up to the <tt>/</tt> before the cursor; this
overrides the setting of <tt>accept-exact-dirs</tt>.
</p>
<p>Even with the style set to ‘false’, it is still possible to complete
multiple paths by setting the option <tt>COMPLETE_IN_WORD</tt> and moving the
cursor back to the first component in the path to be completed. For
example, <tt>/u/b/z</tt> can be completed to <tt>/usr/bin/zsh</tt> if the cursor is
after the <tt>/u</tt>.
</p>
<a name="index-pine_002ddirectory_002c-completion-style"></a>
</dd>
<dt><tt>pine-directory</tt></dt>
<dd><p>If set, specifies the directory containing PINE mailbox files. There
is no default, since recursively searching this directory is inconvenient
for anyone who doesn’t use PINE.
</p>
<a name="index-ports_002c-completion-style"></a>
</dd>
<dt><tt>ports</tt></dt>
<dd><p>A list of Internet service names (network ports) to complete. If this is
not set, service names are taken from the file ‘<tt>/etc/services</tt>’.
</p>
<a name="index-prefix_002dhidden_002c-completion-style"></a>
</dd>
<dt><tt>prefix-hidden</tt></dt>
<dd><p>This is used for certain completions which share a common prefix, for
example command options beginning with dashes. If it is ‘true’, the
prefix will not be shown in the list of matches.
</p>
<p>The default value for this style is ‘false’.
</p>
<a name="index-prefix_002dneeded_002c-completion-style"></a>
</dd>
<dt><tt>prefix-needed</tt></dt>
<dd><p>This style is also relevant for matches with a common prefix. If it is
set to ‘true’ this common prefix must be typed by the user to generate
the matches.
</p>
<p>The style is applicable to the <tt>options</tt>, <tt>signals</tt>, <tt>jobs</tt>,
<tt>functions</tt>, and <tt>parameters</tt> completion tags.
</p>
<p>For command options, this means that the initial ‘<tt>-</tt>’, ‘<tt>+</tt>’, or
‘<tt>-</tt><tt>-</tt>’ must be typed explicitly before option names will be
completed.
</p>
<p>For signals, an initial ‘<tt>-</tt>’ is required before signal names will
be completed.
</p>
<p>For jobs, an initial ‘<tt>%</tt>’ is required before job names will be
completed.
</p>
<p>For function and parameter names, an initial ‘<tt>_</tt>’ or ‘<tt>.</tt>’ is
required before function or parameter names starting with those
characters will be completed.
</p>
<p>The default value for this style is ‘false’ for <tt>function</tt> and
<tt>parameter</tt> completions, and ‘true’ otherwise.
</p>
<a name="index-preserve_002dprefix_002c-completion-style"></a>
</dd>
<dt><tt>preserve-prefix</tt></dt>
<dd><p>This style is used when completing path names. Its value should be a
pattern matching an initial prefix of the word to complete that should
be left unchanged under all circumstances. For example, on some Unices
an initial ‘<tt>//</tt>’ (double slash) has a special meaning; setting
this style to the string ‘<tt>//</tt>’ will preserve it. As another example,
setting this style to ‘<tt>?:/</tt>’ under Cygwin would allow completion
after ‘<tt>a:/...</tt>’ and so on.
</p>
<a name="index-range_002c-completion-style"></a>
</dd>
<dt><tt>range</tt></dt>
<dd><p>This is used by the <tt>_history</tt> completer and the
<tt>_history_complete_word</tt> bindable command to decide which words
should be completed.
</p>
<p>If it is a single number, only the last <var>N</var> words from the history
will be completed.
</p>
<p>If it is a range of the form ‘<var>max</var><tt>:</tt><var>slice</var>’,
the last <var>slice</var> words will be completed; then if that
yields no matches, the <var>slice</var> words before those will be tried and
so on. This process stops either when at least one match has been
found, or <var>max</var> words have been tried.
</p>
<p>The default is to complete all words from the history at once.
</p>
<a name="index-recursive_002dfiles_002c-completion-style"></a>
</dd>
<dt><tt>recursive-files</tt></dt>
<dd><p>If this style is set, its value is an array of patterns to be
tested against ‘<tt>$PWD/</tt>’: note the trailing slash, which allows
directories in the pattern to be delimited unambiguously by including
slashes on both sides. If an ordinary file completion fails
and the word on the command line does not yet have a directory part to its
name, the style is retrieved using the same tag as for the completion
just attempted, then the elements tested against <tt>$PWD/</tt> in turn.
If one matches, then the shell reattempts completion by prepending the word
on the command line with each directory in the expansion of <tt>**/*(/)</tt>
in turn. Typically the elements of the style will be set to restrict
the number of directories beneath the current one to a manageable
number, for example ‘<tt>*/.git/*</tt>’.
</p>
<p>For example,
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' recursive-files '*/zsh/*'
</pre></div>
<p>If the current directory is <tt>/home/pws/zsh/Src</tt>, then
<tt>zle_tr</tt><em>TAB</em> can be completed to <tt>Zle/zle_tricky.c</tt>.
</p>
<a name="index-regular_002c-completion-style"></a>
</dd>
<dt><tt>regular</tt></dt>
<dd><p>This style is used by the <tt>_expand_alias</tt> completer and bindable
command. If set to ‘true’ (the default), regular aliases will be
expanded but only in command position. If it is set to ‘false’,
regular aliases will never be expanded. If it is set to ‘<tt>always</tt>’,
regular aliases will be expanded even if not in command position.
</p>
<a name="index-rehash_002c-completion-style"></a>
</dd>
<dt><tt>rehash</tt></dt>
<dd><p>If this is set when completing external commands, the internal
list (hash) of commands will be updated for each search by issuing
the <tt>rehash</tt> command. There is a speed penalty for this which
is only likely to be noticeable when directories in the path have
slow file access.
</p>
<a name="index-remote_002daccess_002c-completion-style"></a>
</dd>
<dt><tt>remote-access</tt></dt>
<dd><p>If set to ‘false’, certain commands will be prevented from making
Internet connections to retrieve remote information. This includes the
completion for the <tt>CVS</tt> command.
</p>
<p>It is not always possible to know if connections are in fact to a remote
site, so some may be prevented unnecessarily.
</p>
<a name="index-remove_002dall_002ddups_002c-completion-style"></a>
</dd>
<dt><tt>remove-all-dups</tt></dt>
<dd><p>The <tt>_history_complete_word</tt> bindable command and the <tt>_history</tt>
completer use this to decide if all duplicate matches should be
removed, rather than just consecutive duplicates.
</p>
<a name="index-select_002dprompt_002c-completion-style"></a>
</dd>
<dt><tt>select-prompt</tt></dt>
<dd><p>If this is set for the <tt>default</tt> tag, its
value will be displayed during menu selection (see the <tt>menu</tt> style
above) when the completion list does not fit on the screen as a
whole. The same escapes as for the <tt>list-prompt</tt> style are
understood, except that the numbers refer to the match or line the mark is
on. A default prompt is used when the value is the empty string.
</p>
<a name="index-select_002dscroll_002c-completion-style"></a>
</dd>
<dt><tt>select-scroll</tt></dt>
<dd><p>This style is tested for the <tt>default</tt> tag and determines how a
completion list is scrolled during a menu selection (see the <tt>menu</tt>
style above) when the completion list does not fit on the screen as a
whole. If the value is ‘<tt>0</tt>’ (zero), the list is scrolled by
half-screenfuls; if it is a positive integer, the list is scrolled by the
given number of lines; if it is a negative number, the list is scrolled by a
screenful minus the absolute value of the given number of lines.
The default is to scroll by single lines.
</p>
<a name="index-separate_002dsections_002c-completion-style"></a>
</dd>
<dt><tt>separate-sections</tt></dt>
<dd><p>This style is used with the <tt>manuals</tt> tag when completing names of
manual pages. If it is ‘true’, entries for different sections are
added separately using tag names of the form ‘<tt>manual.</tt><var>X</var>’,
where <var>X</var> is the section number. When the <tt>group-name</tt> style is
also in effect, pages from different sections will appear separately.
This style is also used similarly with the <tt>words</tt> style when
completing words for the dict command. It allows words from different
dictionary databases to be added separately.
The default for this style is ‘false’.
</p>
<a name="index-show_002dambiguity_002c-completion-style"></a>
</dd>
<dt><tt>show-ambiguity</tt></dt>
<dd><p>If the <tt>zsh/complist</tt> module is loaded, this style can be used to
highlight the first ambiguous character in completion lists. The
value is either a color indication such as those supported by the
<tt>list-colors</tt> style or, with a value of ‘true’, a default of
underlining is selected. The highlighting is only applied if the
completion display strings correspond to the actual matches.
</p>
<a name="index-show_002dcompleter_002c-completion-style"></a>
</dd>
<dt><tt>show-completer</tt></dt>
<dd><p>Tested whenever a new completer is tried. If it is ‘true’, the completion
system outputs a progress message in the listing area showing what
completer is being tried. The message will be overwritten by any output
when completions are found and is removed after completion is finished.
</p>
<a name="index-single_002dignored_002c-completion-style"></a>
</dd>
<dt><tt>single-ignored</tt></dt>
<dd><p>This is used by the <tt>_ignored</tt> completer when there is only one match.
If its value is ‘<tt>show</tt>’, the single match will be
displayed but not inserted. If the value is ‘<tt>menu</tt>’, then the single
match and the original string are both added as matches and menu completion
is started, making it easy to select either of them.
</p>
<a name="index-sort_002c-completion-style"></a>
</dd>
<dt><tt>sort</tt></dt>
<dd><p>Many completion widgets call <tt>_description</tt> at some point which
decides whether the matches are added sorted or unsorted (often
indirectly via <tt>_wanted</tt> or <tt>_requested</tt>). This style can be set
explicitly to one of the usual ‘true’ or ‘false’ values as an override.
If it is not set for the context, the standard behaviour of the
calling widget is used.
</p>
<p>The style is tested first against the full context including the tag, and
if that fails to produce a value against the context without the tag.
</p>
<p>If the calling widget explicitly requests unsorted matches, this is usually
honoured. However, the default (unsorted) behaviour of completion
for the command history may be overridden by setting the style to
‘true’.
</p>
<p>In the <tt>_expand</tt> completer, if it is set to
‘true’, the expansions generated will always be sorted. If it is set
to ‘<tt>menu</tt>’, then the expansions are only sorted when they are offered
as single strings but not in the string containing all possible
expansions.
</p>
<a name="index-special_002ddirs_002c-completion-style"></a>
</dd>
<dt><tt>special-dirs</tt></dt>
<dd><p>Normally, the completion code will not produce the directory names
‘<tt>.</tt>’ and ‘<tt>..</tt>’ as possible completions. If this style is set to
‘true’, it will add both ‘<tt>.</tt>’ and ‘<tt>..</tt>’ as possible completions;
if it is set to ‘<tt>..</tt>’, only ‘<tt>..</tt>’ will be added.
</p>
<p>The following example sets <tt>special-dirs</tt> to ‘<tt>..</tt>’ when the
current prefix is empty, is a single ‘<tt>.</tt>’, or consists only of a path
beginning with ‘<tt>../</tt>’. Otherwise the value is ‘false’.
</p>
<div class="example">
<pre class="example">zstyle -e ':completion:*' special-dirs \
'[[ $PREFIX = (../)#(|.|..) ]] && reply=(..)'
</pre></div>
<a name="index-squeeze_002dslashes_002c-completion-style"></a>
</dd>
<dt><tt>squeeze-slashes</tt></dt>
<dd><p>If set to ‘true’, sequences of slashes in filename paths (for example in
‘<tt>foo//bar</tt>’) will be treated as a single slash. This is the usual
behaviour of UNIX paths. However, by default the file completion
function behaves as if there were a ‘<tt>*</tt>’ between the slashes.
</p>
<a name="index-stop_002c-completion-style"></a>
</dd>
<dt><tt>stop</tt></dt>
<dd><p>If set to ‘true’, the <tt>_history_complete_word</tt> bindable
command will stop once when reaching the beginning or end of the
history. Invoking <tt>_history_complete_word</tt> will then wrap around to
the opposite end of the history. If this style is set to ‘false’ (the
default), <tt>_history_complete_word</tt> will loop immediately as in a
menu completion.
</p>
<a name="index-strip_002dcomments_002c-completion-style"></a>
</dd>
<dt><tt>strip-comments</tt></dt>
<dd><p>If set to ‘true’, this style causes non-essential comment text to be
removed from completion matches. Currently it is only used when
completing e-mail addresses where it removes any display name from the
addresses, cutting them down to plain <var>user@host</var> form.
</p>
<a name="index-subst_002dglobs_002donly_002c-completion-style"></a>
</dd>
<dt><tt>subst-globs-only</tt></dt>
<dd><p>This is used by the <tt>_expand</tt> completer. If it is set to ‘true’,
the expansion will only be used if it resulted from globbing; hence,
if expansions resulted from the use of the <tt>substitute</tt> style
described below, but these were not further changed by globbing, the
expansions will be rejected.
</p>
<p>The default for this style is ‘false’.
</p>
<a name="index-substitute_002c-completion-style"></a>
</dd>
<dt><tt>substitute</tt></dt>
<dd><p>This boolean style controls whether the <tt>_expand</tt> completer will
first try to expand all substitutions in the string (such as
‘<tt>$(</tt><var>...</var><tt>)</tt>’ and ‘<tt>${</tt><var>...</var><tt>}</tt>’).
</p>
<p>The default is ‘true’.
</p>
<a name="index-suffix_002c-completion-style"></a>
</dd>
<dt><tt>suffix</tt></dt>
<dd><p>This is used by the <tt>_expand</tt> completer if the word starts with a
tilde or contains a parameter expansion. If it is set to ‘true’, the
word will only be expanded if it doesn’t have a suffix, i.e. if it is
something like ‘<tt>~foo</tt>’ or ‘<tt>$foo</tt>’ rather than ‘<tt>~foo/</tt>’ or
‘<tt>$foo/bar</tt>’, unless that suffix itself contains characters eligible
for expansion. The default for this style is ‘true’.
</p>
<a name="index-tag_002dorder_002c-completion-style"></a>
</dd>
<dt><tt>tag-order</tt></dt>
<dd><p>This provides a mechanism for sorting how the tags available in a
particular context will be used.
</p>
<p>The values for the style are sets of space-separated lists of tags.
The tags in each value will be tried at the same time; if no match is
found, the next value is used. (See the <tt>file-patterns</tt> style for
an exception to this behavior.)
</p>
<p>For example:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:complete:-command-:*:*' tag-order \
'commands functions'
</pre></div>
<p>specifies that completion in command position first offers
external commands and shell functions. Remaining tags will be tried if
no completions are found.
</p>
<p>In addition to tag names, each string in the value may take one of the
following forms:
</p>
<dl compact="compact">
<dt><tt>-</tt></dt>
<dd><p>If any value consists of only a hyphen,
then <em>only</em> the tags specified in the other values are
generated. Normally all tags not explicitly selected are tried last
if the specified tags fail to generate any matches. This means
that a single value consisting only of a single hyphen
turns off completion.
</p>
</dd>
<dt><tt>!</tt> <var>tags</var>...</dt>
<dd><p>A string starting with an exclamation mark
specifies names of tags that are <em>not</em> to be used. The effect is
the same as if all other possible tags for the context had been
listed.
</p>
</dd>
<dt><var>tag</var><tt>:</tt><var>label</var> ...</dt>
<dd><p>Here, <var>tag</var> is one of the standard tags and <var>label</var> is an
arbitrary name. Matches are generated as normal but the name <var>label</var>
is used in contexts instead of <var>tag</var>. This is not useful in words
starting with <tt>!</tt>.
</p>
<p>If the <var>label</var> starts with a hyphen, the <var>tag</var> is prepended to the
<var>label</var> to form the name used for lookup. This can be
used to make the completion system try a certain tag more than once,
supplying different style settings for each attempt; see below for an
example.
</p>
</dd>
<dt><var>tag</var><tt>:</tt><var>label</var><tt>:</tt><var>description</var></dt>
<dd><p>As before, but <tt>description</tt> will replace the ‘<tt>%d</tt>’ in
the value of the <tt>format</tt> style instead of the default description
supplied by the completion function. Spaces in the description must
be quoted with a backslash. A ‘<tt>%d</tt>’ appearing
in <var>description</var> is replaced with the description given by the
completion function.
</p>
</dd>
</dl>
<p>In any of the forms above the tag may be a pattern or several
patterns in the form ‘<tt>{</tt><var>pat1</var><tt>,</tt><var>pat2...</var><tt>}</tt>’. In this
case all matching tags will be used except
for any given explicitly in the same string.
</p>
<p>One use of these features is to try
one tag more than once, setting other styles differently on
each attempt, but still to use all the other tags without having to
repeat them all. For example, to make completion of function names in
command position ignore all the completion functions starting with an
underscore the first time completion is tried:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:-command-:*:*' tag-order \
'functions:-non-comp *' functions
zstyle ':completion:*:functions-non-comp' \
ignored-patterns '_*'
</pre></div>
<p>On the first attempt, all tags will be offered but the <tt>functions</tt> tag
will be replaced by <tt>functions-non-comp</tt>. The <tt>ignored-patterns</tt> style
is set for this tag to exclude functions starting with an underscore.
If there are no matches, the second value of the
<tt>tag-order</tt> style is used which completes functions using the default
tag, this time presumably including all function names.
</p>
<p>The matches for one tag can be split into different groups. For example:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' tag-order \
'options:-long:long\ options
options:-short:short\ options
options:-single-letter:single\ letter\ options'
zstyle ':completion:*:options-long' \
ignored-patterns '[-+](|-|[^-]*)'
zstyle ':completion:*:options-short' \
ignored-patterns '--*' '[-+]?'
zstyle ':completion:*:options-single-letter' \
ignored-patterns '???*'
</pre></div>
<p>With the <tt>group-names</tt> style set, options beginning with
‘<tt>-</tt><tt>-</tt>’, options beginning with a single ‘<tt>-</tt>’ or ‘<tt>+</tt>’ but
containing multiple characters, and single-letter options will be
displayed in separate groups with different descriptions.
</p>
<p>Another use of patterns is to
try multiple match specifications one after another. The
<tt>matcher-list</tt> style offers something similar, but it is tested very
early in the completion system and hence can’t be set for single
commands nor for more specific contexts. Here is how to
try normal completion without any match specification and, if that
generates no matches, try again with case-insensitive matching, restricting
the effect to arguments of the command <tt>foo</tt>:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*:*:foo:*:*' tag-order '*' '*:-case'
zstyle ':completion:*-case' matcher 'm:{a-z}={A-Z}'
</pre></div>
<p>First, all the tags offered when completing after <tt>foo</tt> are tried using
the normal tag name. If that generates no matches, the second value of
<tt>tag-order</tt> is used, which tries all tags again except that this time
each has <tt>-case</tt> appended to its name for lookup of styles. Hence this
time the value for the <tt>matcher</tt> style from the second call to <tt>zstyle</tt>
in the example is used to make completion case-insensitive.
</p>
<p>It is possible to use the <tt>-e</tt> option of the <tt>zstyle</tt> builtin
command to specify conditions for the use of particular tags. For
example:
</p>
<div class="example">
<pre class="example">zstyle -e '*:-command-:*' tag-order '
if [[ -n $PREFIX$SUFFIX ]]; then
reply=( )
else
reply=( - )
fi'
</pre></div>
<p>Completion in command position will be attempted only if the string
typed so far is not empty. This is tested using the <tt>PREFIX</tt>
special parameter; see
<a href="Completion-Widgets.html#Completion-Widgets">Completion Widgets</a>
for a description of parameters which are special inside completion widgets.
Setting <tt>reply</tt> to an empty array provides the default
behaviour of trying all tags at once; setting it to an
array containing only a hyphen disables the use of all tags and hence of
all completions.
</p>
<p>If no <tt>tag-order</tt> style has been defined for a context, the strings
‘<tt>(|*-)argument-* (|*-)option-* values</tt>’ and ‘<tt>options</tt>’ plus all
tags offered by the completion function will be used to provide a
sensible default behavior that causes arguments (whether normal command
arguments or arguments of options) to be completed before option names for
most commands.
</p>
<a name="index-urls_002c-completion-style"></a>
</dd>
<dt><tt>urls</tt></dt>
<dd><p>This is used together with the <tt>urls</tt> tag by
functions completing URLs.
</p>
<p>If the value consists of more than one string, or if the only string
does not name a file or directory, the strings are used as the URLs to
complete.
</p>
<p>If the value contains only one string which is the name of a normal
file the URLs are taken from that file (where the URLs may be
separated by white space or newlines).
</p>
<p>Finally, if the only string in the value names a directory, the
directory hierarchy rooted at this directory gives the completions. The
top level directory should be the file access method, such as
‘<tt>http</tt>’, ‘<tt>ftp</tt>’, ‘<tt>bookmark</tt>’ and so on. In many cases the next
level of directories will be a filename. The directory hierarchy can
descend as deep as necessary.
</p>
<p>For example,
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' urls ~/.urls
mkdir -p ~/.urls/ftp/ftp.zsh.org/pub
</pre></div>
<p>allows completion of all the components of the URL
<tt>ftp://ftp.zsh.org/pub</tt> after suitable commands such as
‘<tt>netscape</tt>’ or ‘<tt>lynx</tt>’. Note, however, that access methods and
files are completed separately, so if the <tt>hosts</tt> style is set hosts
can be completed without reference to the <tt>urls</tt> style.
</p>
<p>See the description in the function <tt>_urls</tt> itself
for more information (e.g. ‘<tt>more $^fpath/_urls(N)</tt>’).
</p>
<a name="index-use_002dcache_002c-completion-style"></a>
</dd>
<dt><tt>use-cache</tt></dt>
<dd><p>If this is set, the completion caching layer is activated for any completions
which use it (via the <tt>_store_cache</tt>, <tt>_retrieve_cache</tt>, and
<tt>_cache_invalid</tt> functions). The directory containing the cache
files can be changed with the <tt>cache-path</tt> style.
</p>
<a name="index-use_002dcompctl_002c-completion-style"></a>
</dd>
<dt><tt>use-compctl</tt></dt>
<dd><p>If this style is set to a string <em>not</em> equal to <tt>false</tt>, <tt>0</tt>,
<tt>no</tt>, and <tt>off</tt>, the completion system may use any completion
specifications defined with the <tt>compctl</tt> builtin command. If the
style is unset, this is done only if the <tt>zsh/compctl</tt> module
is loaded. The string may also contain the substring ‘<tt>first</tt>’ to
use completions defined with ‘<tt>compctl -T</tt>’, and the substring
‘<tt>default</tt>’ to use the completion defined with ‘<tt>compctl -D</tt>’.
</p>
<p>Note that this is only intended to smooth the transition from
<tt>compctl</tt> to the new completion system and may disappear in the
future.
</p>
<p>Note also that the definitions from <tt>compctl</tt> will only be used if
there is no specific completion function for the command in question. For
example, if there is a function <tt>_foo</tt> to complete arguments to the
command <tt>foo</tt>, <tt>compctl</tt> will never be invoked for <tt>foo</tt>.
However, the <tt>compctl</tt> version will be tried if <tt>foo</tt> only uses
default completion.
</p>
<a name="index-use_002dip_002c-completion-style"></a>
</dd>
<dt><tt>use-ip</tt></dt>
<dd><p>By default, the function <tt>_hosts</tt> that completes host names strips
IP addresses from entries read from host databases such as NIS and
ssh files. If this style is ‘true’, the corresponding IP addresses
can be completed as well. This style is not use in any context
where the <tt>hosts</tt> style is set; note also it must be set before
the cache of host names is generated (typically the first completion
attempt).
</p>
<a name="index-users_002c-completion-style"></a>
</dd>
<dt><tt>users</tt></dt>
<dd><p>This may be set to a list of usernames to be completed.
If it is not set all usernames will be completed.
Note that if it is set only that list of users will be completed;
this is because on some systems querying all users can take
a prohibitive amount of time.
</p>
<a name="index-users_002dhosts_002c-completion-style"></a>
</dd>
<dt><tt>users-hosts</tt></dt>
<dd><p>The values of this style should be of the form
‘<var>user</var><tt>@</tt><var>host</var>’ or ‘<var>user</var><tt>:</tt><var>host</var>’. It is used for
commands that need pairs of
user- and hostnames. These commands will complete usernames from this
style (only), and will restrict subsequent hostname completion to hosts
paired with that user in one of the values of the style.
</p>
<p>It is possible to group values for sets of commands which allow a remote
login, such as <tt>rlogin</tt> and <tt>ssh</tt>, by using the <tt>my-accounts</tt> tag.
Similarly, values for sets of commands which usually refer to the
accounts of other people, such as <tt>talk</tt> and <tt>finger</tt>, can be
grouped by using the <tt>other-accounts</tt> tag. More ambivalent commands
may use the <tt>accounts</tt> tag.
</p>
<a name="index-users_002dhosts_002dports_002c-completion-style"></a>
</dd>
<dt><tt>users-hosts-ports</tt></dt>
<dd><p>Like <tt>users-hosts</tt> but used for commands like <tt>telnet</tt> and
containing strings of the form ‘<var>user</var><tt>@</tt><var>host</var><tt>:</tt><var>port</var>’.
</p>
<a name="index-verbose_002c-completion-style"></a>
</dd>
<dt><tt>verbose</tt></dt>
<dd><p>If set, as it is by default, the completion listing is more verbose.
In particular many commands show descriptions for options if this
style is ‘true’.
</p>
<a name="index-word_002c-completion-style"></a>
</dd>
<dt><tt>word</tt></dt>
<dd><p>This is used by the <tt>_list</tt> completer, which prevents the insertion of
completions until a second completion attempt when the line has not
changed. The normal way of finding out if the line has changed is to
compare its entire contents between the two occasions. If this style is
‘true’, the comparison is instead performed only on the current word.
Hence if completion is performed on another word with the same contents,
completion will not be delayed.
</p>
</dd>
</dl>
<hr>
<a name="Control-Functions"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Standard-Styles" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Bindable-Commands" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Control-Functions-1"></a>
<h2 class="section">20.4 Control Functions</h2>
<a name="index-completion-system_002c-choosing-completers"></a>
<p>The initialization script <tt>compinit</tt> redefines all the widgets
which perform completion to call the supplied widget function
<tt>_main_complete</tt>. This function acts as a wrapper calling the
so-called ‘completer’ functions that generate matches. If
<tt>_main_complete</tt> is called with arguments, these are taken as the
names of completer functions to be called in the order given. If no
arguments are given, the set of functions to try is taken from the
<tt>completer</tt> style. For example, to use normal completion and
correction if that doesn’t generate any matches:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' completer _complete _correct
</pre></div>
<p>after calling <tt>compinit</tt>. The default value for this style is
‘<tt>_complete _ignored</tt>’, i.e. normally only ordinary completion is tried,
first with the effect of the <tt>ignored-patterns</tt> style and then without
it. The <tt>_main_complete</tt> function uses the return status of the completer
functions to decide if other completers should be called. If the return
status is zero, no other completers are tried and the <tt>_main_complete</tt>
function returns.
</p>
<p>If the first argument to <tt>_main_complete</tt> is a single hyphen, the
arguments will not be taken as names of completers. Instead, the
second argument gives a name to use in the <var>completer</var> field of the
context and the other arguments give a command name and arguments to
call to generate the matches.
</p>
<p>The following completer functions are contained in the distribution,
although users may write their own. Note that in contexts the leading
underscore is stripped, for example basic completion is performed in the
context ‘<tt>:completion::complete:</tt><var>...</var>’.
</p>
<a name="index-completion-system_002c-completers"></a>
<dl compact="compact">
<dd><a name="index-_005fall_005fmatches"></a>
</dd>
<dt><tt>_all_matches</tt></dt>
<dd><p>This completer can be used to add a string consisting of all other
matches. As it influences later completers it must appear as the first
completer in the list. The list of all matches is affected by the
<tt>avoid-completer</tt> and <tt>old-matches</tt> styles described above.
</p>
<p>It may be useful to use the <tt>_generic</tt> function described below
to bind <tt>_all_matches</tt> to its own keystroke, for example:
</p>
<div class="example">
<pre class="example">zle -C all-matches complete-word _generic
bindkey '^Xa' all-matches
zstyle ':completion:all-matches:*' old-matches only
zstyle ':completion:all-matches::::' completer _all_matches
</pre></div>
<p>Note that this does not generate completions by itself: first use
any of the standard ways of generating a list of completions,
then use <tt>^Xa</tt> to show all matches. It is possible instead to
add a standard completer to the list and request that the
list of all matches should be directly inserted:
</p>
<div class="example">
<pre class="example">zstyle ':completion:all-matches::::' completer \
_all_matches _complete
zstyle ':completion:all-matches:*' insert true
</pre></div>
<p>In this case the <tt>old-matches</tt> style should not be set.
</p>
<a name="index-_005fapproximate"></a>
</dd>
<dt><tt>_approximate</tt></dt>
<dd><p>This is similar to the basic <tt>_complete</tt> completer but allows the
completions to undergo corrections. The maximum number of errors can be
specified by the <tt>max-errors</tt> style; see the description of
approximate matching in
<a href="Expansion.html#Filename-Generation">Filename Generation</a>
for how errors are counted. Normally this completer will only be tried
after the normal <tt>_complete</tt> completer:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' completer _complete _approximate
</pre></div>
<p>This will give correcting completion if and only if
normal completion yields no possible completions. When
corrected completions are found, the completer will normally start
menu completion allowing you to cycle through these strings.
</p>
<p>This completer uses the tags <tt>corrections</tt> and <tt>original</tt> when
generating the possible corrections and the original string. The
<tt>format</tt> style for the former may contain the additional sequences
‘<tt>%e</tt>’ and ‘<tt>%o</tt>’ which will be replaced by the number of errors
accepted to generate the corrections and the original string,
respectively.
</p>
<p>The completer progressively increases the number of errors allowed up to
the limit by the <tt>max-errors</tt> style, hence if a completion is found
with one error, no completions with two errors will be shown, and so on.
It modifies the completer name in the context to indicate the number of
errors being tried: on the first try the completer field contains
‘<tt>approximate-1</tt>’, on the second try ‘<tt>approximate-2</tt>’, and so on.
</p>
<p>When <tt>_approximate</tt> is called from another function, the number of
errors to accept may be passed with the <tt>-a</tt> option. The argument
is in the same format as the <tt>max-errors</tt> style, all in one string.
</p>
<p>Note that this completer (and the <tt>_correct</tt> completer mentioned
below) can be quite expensive to call, especially when a large number
of errors are allowed. One way to avoid this is to set up the
<tt>completer</tt> style using the <tt>-e</tt> option to zstyle so that some
completers are only used when completion is attempted a second time on
the same string, e.g.:
</p>
<div class="example">
<pre class="example">zstyle -e ':completion:*' completer '
if [[ $_last_try != "$HISTNO$BUFFER$CURSOR" ]]; then
_last_try="$HISTNO$BUFFER$CURSOR"
reply=(_complete _match _prefix)
else
reply=(_ignored _correct _approximate)
fi'
</pre></div>
<p>This uses the <tt>HISTNO</tt> parameter and the <tt>BUFFER</tt> and <tt>CURSOR</tt>
special parameters that are available inside zle and completion
widgets to find out if the command line hasn’t changed since the last
time completion was tried. Only then are the <tt>_ignored</tt>,
<tt>_correct</tt> and <tt>_approximate</tt> completers called.
</p>
<a name="index-_005fcomplete"></a>
</dd>
<dt><tt>_complete</tt></dt>
<dd><p>This completer generates all possible completions in a context-sensitive
manner, i.e. using the settings defined with the <tt>compdef</tt> function
explained above and the current settings of all special parameters.
This gives the normal completion behaviour.
</p>
<p>To complete arguments of commands, <tt>_complete</tt> uses the utility function
<tt>_normal</tt>, which is in turn responsible for finding the particular
function; it is described below. Various contexts of the form
<tt>-</tt><var>context</var><tt>-</tt> are handled specifically. These are all
mentioned above as possible arguments to the <tt>#compdef</tt> tag.
</p>
<p>Before trying to find a function for a specific context, <tt>_complete</tt>
checks if the parameter ‘<tt>compcontext</tt>’ is set. Setting
‘<tt>compcontext</tt>’ allows the usual completion dispatching to be
overridden which is useful in places such as a function that uses
<tt>vared</tt> for input. If it is set to an array, the elements are taken
to be the possible matches which will be completed using the tag
‘<tt>values</tt>’ and the description ‘<tt>value</tt>’. If it is set to an
associative array, the keys are used as the possible completions and
the values (if non-empty) are used as descriptions for the matches. If
‘<tt>compcontext</tt>’ is set to a string containing colons, it should be of
the form ‘<var>tag</var><tt>:</tt><var>descr</var><tt>:</tt><var>action</var>’. In this case the
<var>tag</var> and <var>descr</var> give the tag and description to use and the
<var>action</var> indicates what should be completed in one of the forms
accepted by the <tt>_arguments</tt> utility function described below.
</p>
<p>Finally, if ‘<tt>compcontext</tt>’ is set to a string without colons, the
value is taken as the name of the context to use and the function
defined for that context will be called. For this purpose, there is a
special context named <tt>-command-line-</tt> that completes whole command
lines (commands and their arguments). This is not used by the completion
system itself but is nonetheless handled when explicitly called.
</p>
<a name="index-_005fcorrect"></a>
</dd>
<dt><tt>_correct</tt></dt>
<dd><p>Generate corrections, but not completions, for the current word; this is
similar to <tt>_approximate</tt> but will not allow any number of extra
characters at the cursor as that completer does. The effect is
similar to spell-checking. It is based on <tt>_approximate</tt>, but the
completer field in the context name is <tt>correct</tt>.
</p>
<p>For example, with:
</p>
<div class="example">
<pre class="example">zstyle ':completion:::::' completer \
_complete _correct _approximate
zstyle ':completion:*:correct:::' max-errors 2 not-numeric
zstyle ':completion:*:approximate:::' max-errors 3 numeric
</pre></div>
<p>correction will accept up to two errors. If a numeric argument is
given, correction will not be performed, but correcting completion
will be, and will accept as many errors as given by the numeric
argument. Without a numeric argument, first correction and then
correcting completion will be tried, with the first one accepting two
errors and the second one accepting three errors.
</p>
<p>When <tt>_correct</tt> is called as a function, the number of errors to accept
may be given following the <tt>-a</tt> option. The argument is in the same
form a values to the <tt>accept</tt> style, all in one string.
</p>
<p>This completer function is intended to be used without the
<tt>_approximate</tt> completer or, as in the example, just before
it. Using it after the <tt>_approximate</tt> completer is useless since
<tt>_approximate</tt> will at least generate the corrected strings
generated by the <tt>_correct</tt> completer — and probably more.
</p>
<a name="index-_005fexpand"></a>
</dd>
<dt><tt>_expand</tt></dt>
<dd><p>This completer function does not really perform completion, but instead
checks if the word on the command line is eligible for expansion and,
if it is, gives detailed control over how this expansion is done. For
this to happen, the completion system needs to be invoked with
<tt>complete-word</tt>, not <tt>expand-or-complete</tt> (the default binding for
<tt>TAB</tt>), as otherwise the string will be expanded by the shell’s
internal mechanism before the completion system is started.
Note also this completer should be called before the <tt>_complete</tt>
completer function.
</p>
<p>The tags used when generating expansions are <tt>all-expansions</tt> for the
string containing all possible expansions, <tt>expansions</tt> when adding
the possible expansions as single matches and <tt>original</tt> when adding
the original string from the line. The order in which these strings are
generated, if at all, can be controlled by the <tt>group-order</tt> and
<tt>tag-order</tt> styles, as usual.
</p>
<p>The format string for <tt>all-expansions</tt> and for <tt>expansions</tt> may
contain the sequence ‘<tt>%o</tt>’ which will be replaced by the original
string from the line.
</p>
<p>The kind of expansion to be tried is controlled by the <tt>substitute</tt>,
<tt>glob</tt> and <tt>subst-globs-only</tt> styles.
</p>
<p>It is also possible to call <tt>_expand</tt> as a function, in which case the
different modes may be selected with options: <tt>-s</tt> for
<tt>substitute</tt>, <tt>-g</tt> for <tt>glob</tt> and <tt>-o</tt> for <tt>subst-globs-only</tt>.
</p>
<a name="index-_005fexpand_005falias"></a>
</dd>
<dt><tt>_expand_alias</tt></dt>
<dd><p>If the word the cursor is on is an alias, it is expanded and no other
completers are called. The types of aliases which are to be expanded can
be controlled with the styles <tt>regular</tt>, <tt>global</tt> and <tt>disabled</tt>.
</p>
<p>This function is also a bindable command, see
<a href="#Bindable-Commands">Bindable Commands</a>.
</p>
<a name="index-_005fextensions"></a>
</dd>
<dt><tt>_extensions</tt></dt>
<dd><p>If the cursor follows the string ‘<tt>*.</tt>’, filename extensions are
completed. The extensions are taken from files in current directory or a
directory specified at the beginning of the current word. For exact matches,
completion continues to allow other completers such as <tt>_expand</tt> to
expand the pattern. The standard <tt>add-space</tt> and <tt>prefix-hidden</tt>
styles are observed.
</p>
<a name="index-_005fhistory"></a>
</dd>
<dt><tt>_history</tt></dt>
<dd><p>Complete words from the shell’s command history. This completer
can be controlled by the <tt>remove-all-dups</tt>, and <tt>sort</tt> styles as for the
<tt>_history_complete_word</tt> bindable command, see
<a href="#Bindable-Commands">Bindable Commands</a>
and
<a href="#Completion-System-Configuration">Completion System Configuration</a>.
</p>
<a name="index-_005fignored"></a>
</dd>
<dt><tt>_ignored</tt></dt>
<dd><p>The <tt>ignored-patterns</tt> style can be set to a list of patterns which are
compared against possible completions; matching ones are removed.
With this completer those matches can be reinstated, as
if no <tt>ignored-patterns</tt> style were set. The completer actually
generates its own list of matches; which completers are invoked
is determined in the same way as for the <tt>_prefix</tt> completer.
The <tt>single-ignored</tt> style is also available as described above.
</p>
<a name="index-_005flist"></a>
</dd>
<dt><tt>_list</tt></dt>
<dd><p>This completer allows the insertion of matches to be delayed until
completion is attempted a second time without the word on the line
being changed. On the first attempt, only the list of matches will be
shown. It is affected by the styles <tt>condition</tt> and <tt>word</tt>, see
<a href="#Completion-System-Configuration">Completion System Configuration</a>.
</p>
<a name="index-_005fmatch"></a>
</dd>
<dt><tt>_match</tt></dt>
<dd><p>This completer is intended to be used after the <tt>_complete</tt>
completer. It behaves similarly but the string on the command line may
be a pattern to match against trial completions. This gives the effect
of the <tt>GLOB_COMPLETE</tt> option.
</p>
<p>Normally completion will be performed by taking the pattern from the line,
inserting a ‘<tt>*</tt>’ at the cursor position and comparing the resulting
pattern with the possible completions generated. This can be modified
with the <tt>match-original</tt> style described above.
</p>
<p>The generated matches will be offered in a menu completion unless the
<tt>insert-unambiguous</tt> style is set to ‘true’; see the description above
for other options for this style.
</p>
<p>Note that matcher specifications defined globally or used by the
completion functions (the styles <tt>matcher-list</tt> and <tt>matcher</tt>) will
not be used.
</p>
<a name="index-_005fmenu"></a>
</dd>
<dt><tt>_menu</tt></dt>
<dd><p>This completer was written as simple example function to show how menu
completion can be enabled in shell code. However, it has the notable
effect of disabling menu selection which can be useful with
<tt>_generic</tt> based widgets. It should be used as the first completer in
the list. Note that this is independent of the setting of the
<tt>MENU_COMPLETE</tt> option and does not work with the other menu
completion widgets such as <tt>reverse-menu-complete</tt>, or
<tt>accept-and-menu-complete</tt>.
</p>
<a name="index-_005foldlist"></a>
</dd>
<dt><tt>_oldlist</tt></dt>
<dd><p>This completer controls how the standard completion widgets behave
when there is an existing list of completions which may have been
generated by a special completion (i.e. a separately-bound completion
command). It allows the ordinary completion keys to continue to use the
list of completions thus generated, instead of producing a new list of
ordinary contextual completions.
It should appear in the list of completers before any of
the widgets which generate matches. It uses two styles: <tt>old-list</tt> and
<tt>old-menu</tt>, see
<a href="#Completion-System-Configuration">Completion System Configuration</a>.
</p>
<a name="index-_005fprefix"></a>
</dd>
<dt><tt>_prefix</tt></dt>
<dd><p>This completer can be used to try completion with the suffix (everything
after the cursor) ignored. In other words, the suffix will not be
considered to be part of the word to complete. The effect is similar
to the <tt>expand-or-complete-prefix</tt> command.
</p>
<p>The <tt>completer</tt> style is used to decide which other completers are to
be called to generate matches. If this style is unset, the list of
completers set for the current context is used — except, of course, the
<tt>_prefix</tt> completer itself. Furthermore, if this completer appears
more than once in the list of completers only those completers not
already tried by the last invocation of <tt>_prefix</tt> will be called.
</p>
<p>For example, consider this global <tt>completer</tt> style:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' completer \
_complete _prefix _correct _prefix:foo
</pre></div>
<p>Here, the <tt>_prefix</tt> completer tries normal completion but ignoring the
suffix. If that doesn’t generate any matches, and neither does
the call to the <tt>_correct</tt> completer after it, <tt>_prefix</tt> will
be called a second time and, now only trying correction with the
suffix ignored. On the second invocation the completer part of the
context appears as ‘<tt>foo</tt>’.
</p>
<p>To use <tt>_prefix</tt> as the last resort and try only normal completion
when it is invoked:
</p>
<div class="example">
<pre class="example">zstyle ':completion:*' completer _complete ... _prefix
zstyle ':completion::prefix:*' completer _complete
</pre></div>
<p>The <tt>add-space</tt> style is also respected. If it is set to ‘true’ then
<tt>_prefix</tt> will insert a space between the matches generated (if any)
and the suffix.
</p>
<p>Note that this completer is only useful if the
<tt>COMPLETE_IN_WORD</tt> option is set; otherwise, the cursor will
be moved to the end of the current word before the completion code is
called and hence there will be no suffix.
</p>
<a name="index-_005fuser_005fexpand"></a>
</dd>
<dt><tt>_user_expand</tt></dt>
<dd><p>This completer behaves similarly to the <tt>_expand</tt> completer but
instead performs expansions defined by users. The styles <tt>add-space</tt> and
<tt>sort</tt> styles specific to the <tt>_expand</tt> completer are usable with
<tt>_user_expand</tt> in addition to other styles handled more generally by
the completion system. The tag <tt>all-expansions</tt> is also available.
</p>
<p>The expansion depends on the array style <tt>user-expand</tt> being defined
for the current context; remember that the context for completers is less
specific than that for contextual completion as the full context has not
yet been determined. Elements of the array may have one of the following
forms:
</p><dl compact="compact">
<dt><tt>$</tt><var>hash</var></dt>
<dd>
<p><var>hash</var> is the name of an associative array. Note this is not a full
parameter expression, merely a <tt>$</tt>, suitably quoted to prevent immediate
expansion, followed by the name of an associative array. If the trial
expansion word matches a key in <var>hash</var>, the resulting expansion is the
corresponding value.
</p>
</dd>
<dt><var>_func</var></dt>
<dd>
<p><var>_func</var> is the name of a shell function whose name must begin with
<tt>_</tt> but is not otherwise special to the completion system. The function
is called with the trial word as an argument. If the word is to be
expanded, the function should set the array <tt>reply</tt> to a list of
expansions. Optionally, it can set <tt>REPLY</tt> to a word that will
be used as a description for the set of expansions.
The return status of the function is irrelevant.
</p>
</dd>
</dl>
</dd>
</dl>
<hr>
<a name="Bindable-Commands"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Control-Functions" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-Functions" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Bindable-Commands-1"></a>
<h2 class="section">20.5 Bindable Commands</h2>
<a name="index-completion-system_002c-bindable-commands"></a>
<p>In addition to the context-dependent completions provided, which are
expected to work in an intuitively obvious way, there are a few widgets
implementing special behaviour which can be bound separately to keys. The
following is a list of these and their default bindings.
</p>
<dl compact="compact">
<dd><a name="index-_005fbash_005fcompletions"></a>
</dd>
<dt><tt>_bash_completions</tt></dt>
<dd><p>This function is used by two widgets, <tt>_bash_complete-word</tt> and
<tt>_bash_list-choices</tt>. It exists to provide compatibility with
completion bindings in bash. The last character of the binding determines
what is completed: ‘<tt>!</tt>’, command names; ‘<tt>$</tt>’, environment variables;
‘<tt>@</tt>’, host names; ‘<tt>/</tt>’, file names; ‘<tt>~</tt>’ user names. In bash, the
binding preceded by ‘<tt>\e</tt>’ gives completion, and preceded by ‘<tt>^X</tt>’
lists options. As some of these bindings clash with standard zsh
bindings, only ‘<tt>\e~</tt>’ and ‘<tt>^X~</tt>’ are bound by default. To add the
rest, the following should be added to <tt>.zshrc</tt> after <tt>compinit</tt> has
been run:
</p>
<div class="example">
<pre class="example">for key in '!' '$' '@' '/' '~'; do
bindkey "\e$key" _bash_complete-word
bindkey "^X$key" _bash_list-choices
done
</pre></div>
<p>This includes the bindings for ‘<tt>~</tt>’ in case they were already bound to
something else; the completion code does not override user bindings.
</p>
<a name="index-_005fcorrect_005ffilename-_0028_005eXC_0029"></a>
</dd>
<dt><tt>_correct_filename</tt> (<tt>^XC</tt>)</dt>
<dd><p>Correct the filename path at the cursor position. Allows up to six errors
in the name. Can also be called with an argument to correct
a filename path, independently of zle; the correction is printed on
standard output.
</p>
<a name="index-_005fcorrect_005fword-_0028_005eXc_0029"></a>
</dd>
<dt><tt>_correct_word</tt> (<tt>^Xc</tt>)</dt>
<dd><p>Performs correction of the current argument using the usual contextual
completions as possible choices. This stores the string
‘<tt>correct-word</tt>’ in the <var>function</var> field of the context name and
then calls the <tt>_correct</tt> completer.
</p>
<a name="index-_005fexpand_005falias-_0028_005eXa_0029"></a>
</dd>
<dt><tt>_expand_alias</tt> (<tt>^Xa</tt>)</dt>
<dd><p>This function can be used as a completer and as a bindable command.
It expands the word the cursor is on if it is an alias. The types of
alias expanded can be controlled with the styles <tt>regular</tt>, <tt>global</tt>
and <tt>disabled</tt>.
</p>
<p>When used as a bindable command there is one additional feature that
can be selected by setting the <tt>complete</tt> style to ‘true’. In this
case, if the word is not the name of an alias, <tt>_expand_alias</tt> tries
to complete the word to a full alias name without expanding it. It
leaves the cursor directly after the completed word so that invoking
<tt>_expand_alias</tt> once more will expand the now-complete alias name.
</p>
<a name="index-_005fexpand_005fword-_0028_005eXe_0029"></a>
</dd>
<dt><tt>_expand_word</tt> (<tt>^Xe</tt>)</dt>
<dd><p>Performs expansion on the current word: equivalent to the standard
<tt>expand-word</tt> command, but using the <tt>_expand</tt> completer. Before
calling it, the <var>function</var> field of the context is set to
‘<tt>expand-word</tt>’.
</p>
<a name="index-_005fgeneric"></a>
</dd>
<dt><tt>_generic</tt></dt>
<dd><p>This function is not defined as a widget and not bound by
default. However, it can be used to define a widget and will then
store the name of the widget in the <var>function</var> field of the context
and call the completion system. This allows custom completion widgets
with their own set of style settings to be defined easily. For example,
to define a widget that performs normal completion and starts
menu selection:
</p>
<div class="example">
<pre class="example">zle -C foo complete-word _generic
bindkey '...' foo
zstyle ':completion:foo:*' menu yes select=1
</pre></div>
<p>Note in particular that the <tt>completer</tt> style may be set for the context
in order to change the set of functions used to generate possible matches.
If <tt>_generic</tt> is called with arguments, those are passed through to
<tt>_main_complete</tt> as the list of completers in place of those defined by
the <tt>completer</tt> style.
</p>
<a name="index-_005fhistory_005fcomplete_005fword-_0028_005ce_002f_0029"></a>
</dd>
<dt><tt>_history_complete_word</tt> (<tt>\e/</tt>)</dt>
<dd><p>Complete words from the shell’s command history. This uses the
<tt>list</tt>, <tt>remove-all-dups</tt>, <tt>sort</tt>, and <tt>stop</tt> styles.
</p>
<a name="index-_005fmost_005frecent_005ffile-_0028_005eXm_0029"></a>
</dd>
<dt><tt>_most_recent_file</tt> (<tt>^Xm</tt>)</dt>
<dd><p>Complete the name of the most recently modified file matching the pattern
on the command line (which may be blank). If given a numeric argument
<var>N</var>, complete the <var>N</var>th most recently modified file. Note the
completion, if any, is always unique.
</p>
<a name="index-_005fnext_005ftags-_0028_005eXn_0029"></a>
</dd>
<dt><tt>_next_tags</tt> (<tt>^Xn</tt>)</dt>
<dd><p>This command alters the set of matches used to that for the next tag, or
set of tags, either as given by the <tt>tag-order</tt> style or as set by
default; these matches would otherwise not be available.
Successive invocations of the command cycle through all possible sets of
tags.
</p>
<a name="index-_005fread_005fcomp-_0028_005eX_005eR_0029"></a>
</dd>
<dt><tt>_read_comp</tt> (<tt>^X^R</tt>)</dt>
<dd><p>Prompt the user for a string, and use that to perform completion on the
current word. There are two possibilities for the string. First, it can
be a set of words beginning ‘<tt>_</tt>’, for example ‘<tt>_files -/</tt>’, in which
case the function with any arguments will be called to generate the
completions. Unambiguous parts of the function name will be completed
automatically (normal completion is not available at this point) until a
space is typed.
</p>
<p>Second, any other string will be passed as a set of arguments to
<tt>compadd</tt> and should hence be an expression specifying what should
be completed.
</p>
<p>A very restricted set of editing commands is available when reading the
string: ‘<tt>DEL</tt>’ and ‘<tt>^H</tt>’ delete the last character; ‘<tt>^U</tt>’ deletes
the line, and ‘<tt>^C</tt>’ and ‘<tt>^G</tt>’ abort the function, while ‘<tt>RET</tt>’
accepts the completion. Note the string is used verbatim as a command
line, so arguments must be quoted in accordance with standard shell rules.
</p>
<p>Once a string has been read, the next call to <tt>_read_comp</tt> will use the
existing string instead of reading a new one. To force a new string to be
read, call <tt>_read_comp</tt> with a numeric argument.
</p>
<a name="index-_005fcomplete_005fdebug-_0028_005eX_003f_0029"></a>
</dd>
<dt><tt>_complete_debug</tt> (<tt>^X?</tt>)</dt>
<dd><p>This widget performs ordinary completion, but captures in a temporary file
a trace of the shell commands executed by the completion system. Each
completion attempt gets its own file. A command to view each of these
files is pushed onto the editor buffer stack.
</p>
<a name="index-_005fcomplete_005fhelp-_0028_005eXh_0029"></a>
</dd>
<dt><tt>_complete_help</tt> (<tt>^Xh</tt>)</dt>
<dd><p>This widget displays information about the context names,
the tags, and the completion functions used
when completing at the current cursor position. If given a numeric
argument other than <tt>1</tt> (as in ‘<tt>ESC-2 ^Xh</tt>’), then the styles
used and the contexts for which they are used will be shown, too.
</p>
<p>Note that the information about styles may be incomplete; it depends on the
information available from the completion functions called, which in turn
is determined by the user’s own styles and other settings.
</p>
<a name="index-_005fcomplete_005fhelp_005fgeneric"></a>
</dd>
<dt><tt>_complete_help_generic</tt></dt>
<dd><p>Unlike other commands listed here, this must be created as a normal ZLE
widget rather than a completion widget (i.e. with <tt>zle -N</tt>). It
is used for generating help with a widget bound to the <tt>_generic</tt>
widget that is described above.
</p>
<p>If this widget is created using the name of the function, as it is by
default, then when executed it will read a key sequence. This is expected
to be bound to a call to a completion function that uses the <tt>_generic</tt>
widget. That widget will be executed, and information provided in
the same format that the <tt>_complete_help</tt> widget displays for
contextual completion.
</p>
<p>If the widget’s name contains <tt>debug</tt>, for example if it is created
as ‘<tt>zle -N _complete_debug_generic _complete_help_generic</tt>’, it
will read and execute the keystring for a generic widget as before,
but then generate debugging information as done by <tt>_complete_debug</tt>
for contextual completion.
</p>
<p>If the widget’s name contains <tt>noread</tt>, it will not read a keystring
but instead arrange that the next use of a generic widget run in
the same shell will have the effect as described above.
</p>
<p>The widget works by setting the shell parameter
<tt>ZSH_TRACE_GENERIC_WIDGET</tt> which is read by <tt>_generic</tt>. Unsetting
the parameter cancels any pending effect of the <tt>noread</tt> form.
</p>
<p>For example, after executing the following:
</p>
<div class="example">
<pre class="example">zle -N _complete_debug_generic _complete_help_generic
bindkey '^x:' _complete_debug_generic
</pre></div>
<p>typing ‘<tt>C-x :</tt>’ followed by the key sequence for a generic widget
will cause trace output for that widget to be saved to a file.
</p>
<a name="index-_005fcomplete_005ftag-_0028_005eXt_0029"></a>
</dd>
<dt><tt>_complete_tag</tt> (<tt>^Xt</tt>)</dt>
<dd><p>This widget completes symbol tags created by the <tt>etags</tt> or <tt>ctags</tt>
programmes (note there is no connection with the completion system’s tags)
stored in a file <tt>TAGS</tt>, in the format used by <tt>etags</tt>, or <tt>tags</tt>, in the
format created by <tt>ctags</tt>. It will look back up the path hierarchy for
the first occurrence of either file; if both exist, the file <tt>TAGS</tt> is
preferred. You can specify the full path to a <tt>TAGS</tt> or <tt>tags</tt> file by
setting the parameter <tt>$TAGSFILE</tt> or <tt>$tagsfile</tt> respectively.
The corresponding completion tags used are <tt>etags</tt> and <tt>vtags</tt>, after
emacs and vi respectively.
</p>
</dd>
</dl>
<hr>
<a name="Completion-Functions"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Bindable-Commands" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-Directories" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Utility-Functions"></a>
<h2 class="section">20.6 Utility Functions</h2>
<a name="index-completion-system_002c-utility-functions"></a>
<p>Descriptions follow for utility functions that may be
useful when writing completion functions. If functions are installed in
subdirectories, most of these reside in the
<tt>Base</tt> subdirectory. Like the example
functions for commands in the distribution, the utility functions
generating matches all follow the convention of returning status zero if they
generated completions and non-zero if no matching completions could be
added.
</p>
<p>Two more features are offered by the <tt>_main_complete</tt> function. The
arrays <tt>compprefuncs</tt> and <tt>comppostfuncs</tt> may contain
names of functions that are to be called immediately before or after
completion has been tried. A function will only be called once unless
it explicitly reinserts itself into the array.
</p>
<dl compact="compact">
<dd><a name="index-_005fall_005flabels"></a>
</dd>
<dt><tt>_all_labels</tt> [ <tt>-x</tt> ] [ <tt>-12VJ</tt> ] <var>tag</var> <var>name</var> <var>descr</var> [ <var>command</var> <var>arg</var> ... ]</dt>
<dd><p>This is a convenient interface to the <tt>_next_label</tt> function below,
implementing the loop shown in the <tt>_next_label</tt> example. The
<var>command</var> and its arguments are called to generate the matches. The
options stored in the parameter <var>name</var> will automatically be inserted
into the <var>arg</var>s passed to the <var>command</var>. Normally, they are put
directly after the <var>command</var>, but if one of the <var>arg</var>s is a single
hyphen, they are inserted directly before that. If the hyphen is the last
argument, it will be removed from the argument list before the
<var>command</var> is called. This allows <tt>_all_labels</tt> to be used in almost all
cases where the matches can be generated by a single call to the
<tt>compadd</tt> builtin command or by a call to one of the utility functions.
</p>
<p>For example:
</p>
<div class="example">
<pre class="example">local expl
...
if _requested foo; then
...
_all_labels foo expl '...' compadd ... - $matches
fi
</pre></div>
<p>Will complete the strings from the <tt>matches</tt> parameter, using
<tt>compadd</tt> with additional options which will take precedence over
those generated by <tt>_all_labels</tt>.
</p>
<a name="index-_005falternative"></a>
</dd>
<dt><tt>_alternative</tt> [ <tt>-O</tt> <var>name</var> ] [ <tt>-C</tt> <var>name</var> ] <var>spec</var> ...</dt>
<dd><p>This function is useful in simple cases where multiple tags are available.
Essentially it implements a loop like the one described for the <tt>_tags</tt>
function below.
</p>
<p>The tags to use and the action to perform if a tag is requested are
described using the <var>spec</var>s which are of the form:
‘<var>tag</var><tt>:</tt><var>descr</var><tt>:</tt><var>action</var>’. The <var>tag</var>s are offered using
<tt>_tags</tt> and if the tag is requested, the <var>action</var> is executed with the
given description <var>descr</var>. The <var>action</var>s are those accepted
by the <tt>_arguments</tt> function (described below), excluding the
‘<tt>-></tt><var>state</var>’ and ‘<tt>=</tt><var>...</var>’ forms.
</p>
<p>For example, the <var>action</var> may be a simple function call:
</p>
<div class="example">
<pre class="example">_alternative \
'users:user:_users' \
'hosts:host:_hosts'
</pre></div>
<p>offers usernames and hostnames as possible matches,
generated by the <tt>_users</tt> and <tt>_hosts</tt> functions respectively.
</p>
<p>Like <tt>_arguments</tt>, this function uses <tt>_all_labels</tt> to execute
the actions, which will loop over all sets of tags. Special handling is
only required if there is an additional valid tag, for example inside a
function called from <tt>_alternative</tt>.
</p>
<p>The option ‘<tt>-O</tt> <var>name</var>’ is used in the same way as by the
<tt>_arguments</tt> function. In other words, the elements of the <var>name</var>
array will be passed to <tt>compadd</tt> when executing an action.
</p>
<p>Like <tt>_tags</tt> this function supports the <tt>-C</tt> option to give a
different name for the argument context field.
</p>
<a name="index-_005farguments"></a>
</dd>
<dt><tt>_arguments </tt>[ <tt>-nswWCRS</tt> ] [ <tt>-A</tt> <var>pat</var> ] [ <tt>-O</tt> <var>name</var> ] [ <tt>-M</tt> <var>matchspec</var> ]</dt>
<dt><tt> </tt>[ <tt>:</tt> ] <var>spec</var> ...</dt>
<dt><tt>_arguments</tt> [ <var>opt</var> ... ] <tt>-</tt><tt>-</tt> [ <tt>-i</tt> <var>pats</var> ] [ <tt>-s</tt> <var>pair</var> ] [ <var>helpspec</var> ... ]</dt>
<dd><p>This function can be used to give a complete specification for completion
for a command whose arguments follow standard UNIX option and argument
conventions.
</p>
<p><em>Options overview</em>
</p>
<p>Options to <tt>_arguments</tt> itself must be in separate words, i.e. <tt>-s -w</tt>,
not <tt>-sw</tt>. The options are followed by <var>spec</var>s that describe options and
arguments of the analyzed command. <var>spec</var>s that describe option flags must
precede <var>spec</var>s that describe non-option ("positional" or "normal")
arguments of the analyzed line. To avoid ambiguity, all
options to <tt>_arguments</tt> itself may be separated from the <var>spec</var> forms
by a single colon.
</p>
<p>The ‘<tt>-</tt><tt>-</tt>’
form is used to intuit <var>spec</var> forms from the help output of the command
being analyzed, and is described in detail below. The <var>opts</var> for the
‘<tt>-</tt><tt>-</tt>’ form are otherwise the same options as the first form. Note
that ‘<tt>-s</tt>’ following ‘<tt>-</tt><tt>-</tt>’ has a distinct meaning from ‘<tt>-s</tt>’
preceding ‘<tt>-</tt><tt>-</tt>’, and both may appear.
</p>
<p>The option switches <tt>-s</tt>, <tt>-S</tt>, <tt>-A</tt>, <tt>-w</tt>, and <tt>-W</tt> affect how
<tt>_arguments</tt> parses the analyzed command line’s options. These switches are
useful for commands with standard argument parsing.
</p>
<p>The options of <tt>_arguments</tt> have the following meanings:
</p>
<dl compact="compact">
<dt><tt>-n</tt></dt>
<dd><p>With this option, <tt>_arguments</tt> sets the parameter <tt>NORMARG</tt>
to the position of the first normal argument in the <tt>$words</tt> array,
i.e. the position after the end of the options. If that argument
has not been reached, <tt>NORMARG</tt> is set to <tt>-1</tt>. The caller
should declare ‘<tt>integer NORMARG</tt>’ if the <tt>-n</tt> option is passed;
otherwise the parameter is not used.
</p>
</dd>
<dt><tt>-s</tt></dt>
<dd><p>Enable <em>option stacking</em> for single-letter options, whereby multiple
single-letter options may be combined into a single word. For example,
the two options ‘<tt>-x</tt>’ and ‘<tt>-y</tt>’ may be combined into
a single word ‘<tt>-xy</tt>’. By default, every word corresponds to a single
option name (‘<tt>-xy</tt>’ is a single option named ‘<tt>xy</tt>’).
</p>
<p>Options beginning with a single hyphen or plus sign are eligible for stacking;
words beginning with two hyphens are not.
</p>
<p>Note that <tt>-s</tt> after <tt>-</tt><tt>-</tt> has a different meaning, which is documented
in the segment entitled ‘Deriving <var>spec</var> forms from the help output’.
</p>
</dd>
<dt><tt>-w</tt></dt>
<dd><p>In combination with <tt>-s</tt>, allow option stacking
even if one or more of the options take
arguments. For example, if <tt>-x</tt> takes an argument, with no
<tt>-s</tt>, ‘<tt>-xy</tt>’ is considered as a single (unhandled) option; with
<tt>-s</tt>, <tt>-xy</tt> is an option with the argument ‘<tt>y</tt>’; with both <tt>-s</tt>
and <tt>-w</tt>, <tt>-xy</tt> may be the option <tt>-x</tt> and the option <tt>-y</tt> with
arguments still to come.
</p>
</dd>
<dt><tt>-W</tt></dt>
<dd><p>This option takes <tt>-w</tt> a stage further: it is possible to
complete single-letter options even after an argument that occurs in the
same word. However, it depends on the action performed whether options
will really be completed at this point. For more control, use a
utility function like <tt>_guard</tt> as part of the action.
</p>
</dd>
<dt><tt>-C</tt></dt>
<dd><p>Modify the <tt>curcontext</tt> parameter for an action of the form ‘<tt>-></tt><var>state</var>’.
This is discussed in detail below.
</p>
</dd>
<dt><tt>-R</tt></dt>
<dd><p>Return status 300 instead of zero when a <tt>$state</tt> is to
be handled, in the ‘<tt>-></tt><var>string</var>’ syntax.
</p>
</dd>
<dt><tt>-S</tt></dt>
<dd><p>Do not complete options after a ‘<tt>-</tt><tt>-</tt>’ appearing on the line,
and ignore the ‘<tt>-</tt><tt>-</tt>’. For example, with <tt>-S</tt>, in the line
</p>
<div class="example">
<pre class="example">foobar -x -- -y
</pre></div>
<p>the ‘<tt>-x</tt>’ is considered an option, the ‘<tt>-y</tt>’ is considered an
argument, and the ‘<tt>-</tt><tt>-</tt>’ is considered to be neither.
</p>
</dd>
<dt><tt>-A</tt> <var>pat</var></dt>
<dd><p>Do not complete options after the first non-option
argument on the line. <var>pat</var> is a pattern matching
all strings which are not to be taken as arguments. For example, to make
<tt>_arguments</tt> stop completing options after the first normal argument, but
ignoring all strings starting with a hyphen even if they are not described
by one of the <var>optspec</var>s, the form is ‘<tt>-A "-*"</tt>’.
</p>
</dd>
<dt><tt>-O</tt> <var>name</var></dt>
<dd><p>Pass the elements of the array <var>name</var> as arguments to functions called to
execute <var>action</var>s.
This is discussed in detail below.
</p>
</dd>
<dt><tt>-M</tt> <var>matchspec</var></dt>
<dd><p>Use the match specification <var>matchspec</var> for completing option names and values.
The default <var>matchspec</var> allows partial word completion after ‘<tt>_</tt>’ and
‘<tt>-</tt>’, such as completing ‘<tt>-f-b</tt>’ to ‘<tt>-foo-bar</tt>’. The default
<var>matchspec</var> is:
</p><div class="example">
<pre class="example"><tt>r:|[_-]=* r:|=*</tt>
</pre></div>
</dd>
</dl>
<p><em><var>spec</var>s: overview</em>
</p>
<p>Each of the following forms is a <var>spec</var> describing individual sets of
options or arguments on the command line being analyzed.
</p>
<dl compact="compact">
<dt><var>n</var><tt>:</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dt><var>n</var><tt>::</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dd><p>This describes the <var>n</var>’th normal argument. The <var>message</var> will be
printed above the matches generated and the <var>action</var> indicates what can
be completed in this position (see below). If there are two colons
before the <var>message</var> the argument is optional. If the
<var>message</var> contains only white space, nothing will be printed above
the matches unless the action adds an explanation string itself.
</p>
</dd>
<dt><tt>:</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dt><tt>::</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dd><p>Similar, but describes the <em>next</em> argument, whatever number that
happens to be. If all arguments are specified in this form in the
correct order the numbers are unnecessary.
</p>
</dd>
<dt><tt>*:</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dt><tt>*::</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dt><tt>*:::</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dd><p>This describes how arguments (usually non-option arguments, those not
beginning with <tt>-</tt> or <tt>+</tt>) are to be completed when neither
of the first two forms was provided. Any number of arguments can
be completed in this fashion.
</p>
<p>With two colons before the <var>message</var>, the <tt>words</tt> special array and
the <tt>CURRENT</tt> special parameter are modified to refer only to the
normal arguments when the <var>action</var> is executed or evaluated. With
three colons before the <var>message</var> they are modified to refer only to
the normal arguments covered by this description.
</p>
</dd>
<dt><var>optspec</var></dt>
<dt><var>optspec</var><tt>:</tt><var>...</var></dt>
<dd><p>This describes an option. The colon indicates handling for one or more
arguments to the option; if it is not present, the option is assumed to
take no arguments.
</p>
<p>The following forms are available for the initial <var>optspec</var>, whether
or not the option has arguments.
</p>
<dl compact="compact">
<dt><tt>*</tt><var>optspec</var></dt>
<dd><p>Here <var>optspec</var> is one of the remaining forms below. This indicates
the following <var>optspec</var> may be repeated. Otherwise if the
corresponding option is already present on the command line to the left
of the cursor it will not be offered again.
</p>
</dd>
<dt><tt>-</tt><var>optname</var></dt>
<dt><tt>+</tt><var>optname</var></dt>
<dd><p>In the simplest form the <var>optspec</var> is just the option name beginning
with a minus or a plus sign, such as ‘<tt>-foo</tt>’. The first argument for
the option (if any) must follow as a <em>separate</em> word directly after the
option.
</p>
<p>Either of ‘<tt>-+</tt><var>optname</var>’ and ‘<tt>+-</tt><var>optname</var>’ can be used to
specify that <tt>-</tt><var>optname</var> and <tt>+</tt><var>optname</var> are both valid.
</p>
<p>In all the remaining forms, the leading ‘<tt>-</tt>’ may be replaced by or
paired with ‘<tt>+</tt>’ in this way.
</p>
</dd>
<dt><tt>-</tt><var>optname</var><tt>-</tt></dt>
<dd><p>The first argument of the option must come directly after the option name
<em>in the same word</em>. For example, ‘<tt>-foo-:</tt><var>...</var>’ specifies that
the completed option and argument will look like ‘<tt>-foo</tt><var>arg</var>’.
</p>
</dd>
<dt><tt>-</tt><var>optname</var><tt>+</tt></dt>
<dd><p>The first argument may appear immediately after <var>optname</var> in the same
word, or may appear as a separate word after the option. For example,
‘<tt>-foo+:</tt><var>...</var>’ specifies that the completed option and argument
will look like either ‘<tt>-foo</tt><var>arg</var>’ or ‘<tt>-foo</tt> <var>arg</var>’.
</p>
</dd>
<dt><tt>-</tt><var>optname</var><tt>=</tt></dt>
<dd><p>The argument may appear as the next word, or in same word as the option
name provided that it is separated from it by an equals sign, for
example ‘<tt>-foo=</tt><var>arg</var>’ or ‘<tt>-foo</tt> <var>arg</var>’.
</p>
</dd>
<dt><tt>-</tt><var>optname</var><tt>=-</tt></dt>
<dd><p>The argument to the option must appear after an equals sign in the same
word, and may not be given in the next argument.
</p>
</dd>
<dt><var>optspec</var><tt>[</tt><var>explanation</var><tt>]</tt></dt>
<dd><p>An explanation string may be appended to any of the preceding forms of
<var>optspec</var> by enclosing it in brackets, as in ‘<tt>-q[query operation]</tt>’.
</p>
<p>The <tt>verbose</tt> style is used to decide whether the explanation strings
are displayed with the option in a completion listing.
</p>
<p>If no bracketed explanation string is given but the <tt>auto-description</tt>
style is set and only one argument is described for this <var>optspec</var>, the
value of the style is displayed, with any appearance of the sequence
‘<tt>%d</tt>’ in it replaced by the <var>message</var> of the first <var>optarg</var>
that follows the <var>optspec</var>; see below.
</p>
</dd>
</dl>
<p>It is possible for options with a literal ‘<tt>+</tt>’ or ‘<tt>=</tt>’ to
appear, but that character must be quoted, for example ‘<tt>-\+</tt>’.
</p>
<p>Each <var>optarg</var> following an <var>optspec</var> must take one of the
following forms:
</p>
<dl compact="compact">
<dt><tt>:</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dt><tt>::</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dd><p>An argument to the option; <var>message</var> and <var>action</var> are treated as
for ordinary arguments. In the first form, the argument is mandatory,
and in the second form it is optional.
</p>
<p>This group may be repeated for options which take multiple arguments.
In other words,
<tt>:</tt><var>message1</var><tt>:</tt><var>action1</var><tt>:</tt><var>message2</var><tt>:</tt><var>action2</var>
specifies that the option takes two arguments.
</p>
</dd>
<dt><tt>:*</tt><var>pattern</var><tt>:</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dt><tt>:*</tt><var>pattern</var><tt>::</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dt><tt>:*</tt><var>pattern</var><tt>:::</tt><var>message</var><tt>:</tt><var>action</var></dt>
<dd><p>This describes multiple arguments. Only the last <var>optarg</var> for
an option taking multiple arguments may be
given in this form. If the <var>pattern</var> is empty (i.e. <tt>:*:</tt>), all
the remaining words on the line are to be completed as described by the
<var>action</var>; otherwise, all the words up to and including a word matching
the <var>pattern</var> are to be completed using the <var>action</var>.
</p>
<p>Multiple colons are treated as for the ‘<tt>*:</tt><var>...</var>’ forms for
ordinary arguments: when the <var>message</var> is preceded by two colons,
the <tt>words</tt> special array and the <tt>CURRENT</tt> special parameter are
modified during the execution or evaluation of the <var>action</var> to refer
only to the words after the option. When preceded by three colons, they
are modified to refer only to the words covered by this description.
</p>
</dd>
</dl>
</dd>
</dl>
<p>Any literal colon in an <var>optname</var>, <var>message</var>, or <var>action</var>
must be preceded by a backslash, ‘<tt>\:</tt>’.
</p>
<p>Each of the forms above may be preceded by a list in parentheses
of option names and argument numbers. If the given option is on
the command line, the options and arguments indicated in parentheses
will not be offered. For example,
‘<tt>(-two -three 1)-one:</tt><var>...</var>’ completes the option ‘<tt>-one</tt>’; if this
appears on the command line, the options <tt>-two</tt> and <tt>-three</tt> and the
first ordinary argument will not be completed after it.
‘<tt>(-foo):</tt><var>...</var>’ specifies an ordinary argument completion;
<tt>-foo</tt> will not be completed if that argument is already present.
</p>
<p>Other items may appear in the list of excluded options to indicate
various other items that should not be applied when the current
specification is matched: a single star (<tt>*</tt>) for the rest arguments
(i.e. a specification of the form ‘<tt>*:</tt><var>...</var>’); a colon (<tt>:</tt>)
for all normal (non-option-) arguments; and a hyphen (<tt>-</tt>) for all
options. For example, if ‘<tt>(*)</tt>’ appears before an option and the
option appears on the command line, the list of remaining arguments
(those shown in the above table beginning with ‘<tt>*:</tt>’) will not be
completed.
</p>
<p>To aid in reuse of specifications, it is possible to precede any of the
forms above with ‘<tt>!</tt>’; then the form will no longer be completed,
although if the option or argument appears on the command line they will
be skipped as normal. The main use for this is when the arguments are
given by an array, and <tt>_arguments</tt> is called repeatedly for more
specific contexts: on the first call ‘<tt>_arguments $global_options</tt>’ is
used, and on subsequent calls ‘<tt>_arguments !$^global_options</tt>’.
</p>
<p><em><var>spec</var>s: actions</em>
</p>
<p>In each of the forms above the <var>action</var> determines how
completions should be generated. Except for the ‘<tt>-></tt><var>string</var>’
form below, the <var>action</var> will be executed by calling the
<tt>_all_labels</tt> function to process all tag labels. No special handling
of tags is needed unless a function call introduces a new one.
</p>
<p>The functions called to execute <var>action</var>s will be called with the the
elements of the array named by the ‘<tt>-O</tt> <var>name</var>’ option as arguments.
This can be used, for example, to pass the same set of options for the
<tt>compadd</tt> builtin to all <var>action</var>s.
</p>
<p>The forms for <var>action</var> are as follows.
</p>
<dl compact="compact">
<dt><tt> </tt>(single unquoted space)</dt>
<dd><p>This is useful where an argument is required but it is not possible or
desirable to generate matches for it. The
<var>message</var> will be displayed but no completions listed. Note
that even in this case the colon at the end of the <var>message</var> is
needed; it may only be omitted when neither a <var>message</var>
nor an <var>action</var> is given.
</p>
</dd>
<dt><tt>(</tt><var>item1</var> <var>item2</var> <var>...</var><tt>)</tt></dt>
<dd><p>One of a list of possible matches, for example:
</p>
<div class="example">
<pre class="example"><tt>:foo:(foo bar baz</tt><tt>)</tt>
</pre></div>
</dd>
<dt><tt>((<var>item1</var>\:<var>desc1</var> <var>...</var>))</tt></dt>
<dd><p>Similar to the above, but with descriptions for each possible match.
Note the backslash before the colon. For example,
</p>
<div class="example">
<pre class="example"><tt>:foo:((a\:bar b\:baz</tt><tt>))</tt>
</pre></div>
<p>The matches will be listed together with their descriptions if the
<tt>description</tt> style is set with the <tt>values</tt> tag in the context.
</p>
</dd>
<dt><tt>-></tt><var>string</var></dt>
<dd><a name="index-context_002c-use-of"></a>
<a name="index-line_002c-use-of"></a>
<a name="index-opt_005fargs_002c-use-of"></a>
<p>In this form, <tt>_arguments</tt> processes the arguments and options and then
returns control to the calling function with parameters set to indicate the
state of processing; the calling function then makes its own arrangements
for generating completions. For example, functions that implement a state
machine can use this type of action.
</p>
<p>Where <tt>_arguments</tt> encounters <var>action</var> in the ‘<tt>-></tt><var>string</var>’
format, it will strip all leading and trailing whitespace from <var>string</var>
and set the array <tt>state</tt> to the set of all <var>string</var>s for which an
action is to be performed. The elements of the array <tt>state_descr</tt> are
assigned the corresponding <var>message</var> field from each <var>optarg</var>
containing such an <var>action</var>.
</p>
<p>By default and in common with all other well behaved completion
functions, _arguments returns status zero if it was able to add matches and
non-zero otherwise. However, if the <tt>-R</tt> option is given,
<tt>_arguments</tt> will instead return a status of 300 to indicate that
<tt>$state</tt> is to be handled.
</p>
<p>In addition to <tt>$state</tt> and <tt>$state_descr</tt>, <tt>_arguments</tt> also
sets the global
parameters ‘<tt>context</tt>’, ‘<tt>line</tt>’ and ‘<tt>opt_args</tt>’ as described
below, and does not reset any changes made to the special parameters
such as <tt>PREFIX</tt> and <tt>words</tt>. This gives the calling function the
choice of resetting these parameters or propagating changes in them.
</p>
<p>A function calling <tt>_arguments</tt> with at least
one action containing a ‘<tt>-></tt><var>string</var>’ must therefore declare
appropriate local parameters:
</p>
<div class="example">
<pre class="example">local context state state_descr line
typeset -A opt_args
</pre></div>
<p>to prevent <tt>_arguments</tt> from altering the global environment.
</p>
</dd>
<dt><tt>{</tt><var>eval-string</var><tt>}</tt></dt>
<dd><a name="index-expl_002c-use-of"></a>
<p>A string in braces is evaluated as shell code to generate matches. If the
<var>eval-string</var> itself does not begin with an opening parenthesis or
brace it is split into separate words before execution.
</p>
</dd>
<dt><tt>= </tt><var>action</var></dt>
<dd><p>If the <var>action</var> starts with ‘<tt>= </tt>’ (an equals sign followed by a
space), <tt>_arguments</tt> will insert the contents of the <var>argument</var>
field of the current context as the new first element in the <tt>words</tt>
special array and increment the value of the <tt>CURRENT</tt> special
parameter. This has the effect of inserting a dummy word onto the
completion command line while not changing the point at which completion is
taking place.
</p>
<p>This is most useful with one of the specifiers that restrict the words on
the command line on which the <var>action</var> is to operate (the two- and
three-colon forms above). One particular use is when an <var>action</var> itself
causes <tt>_arguments</tt> on a restricted range; it is necessary to use this
trick to insert an appropriate command name into the range for the second
call to <tt>_arguments</tt> to be able to parse the line.
</p>
</dd>
<dt><var><tt> </tt>word...</var></dt>
<dt><var>word...</var></dt>
<dd><p>This covers all forms other than those above. If the <var>action</var>
starts with a space, the remaining list of words will be invoked unchanged.
</p>
<p>Otherwise it will be invoked with some extra strings placed after the
first word; these are to be passed down as options to the <tt>compadd</tt>
builtin. They ensure that the state specified by <tt>_arguments</tt>, in
particular the descriptions of options and arguments, is correctly passed
to the completion command. These additional arguments
are taken from the array parameter ‘<tt>expl</tt>’; this will be set up
before executing the <var>action</var> and hence may be referred to inside it,
typically in an expansion of the form ‘<tt>$expl[@]</tt>’ which preserves empty
elements of the array.
</p>
</dd>
</dl>
<p>During the performance of the action the array ‘<tt>line</tt>’ will be set to
the normal arguments from the command line, i.e. the words from the
command line after the command name excluding all options and their
arguments. Options are stored in the associative array
‘<tt>opt_args</tt>’ with option names as keys and their arguments as
the values. For options that have more than one argument these are
given as one string, separated by colons. All colons in the original
arguments are preceded with backslashes.
</p>
<p>The parameter ‘<tt>context</tt>’ is set when returning to the calling function
to perform an action of the form ‘<tt>-></tt><var>string</var>’. It is set to an
array of elements corresponding to the elements of <tt>$state</tt>. Each
element is a suitable name for the argument field of the context: either a
string of the form ‘<tt>option</tt><var>-opt</var><tt>-</tt><var>n</var>’ for the <var>n</var>’th
argument of the option <var>-opt</var>, or a string of the form
‘<tt>argument-</tt><var>n</var>’ for the <var>n</var>’th argument. For ‘rest’ arguments,
that is those in the list at the end not handled by position, <var>n</var> is the
string ‘<tt>rest</tt>’. For example, when completing the argument of the <tt>-o</tt>
option, the name is ‘<tt>option-o-1</tt>’, while for the second normal
(non-option-) argument it is ‘<tt>argument-2</tt>’.
</p>
<p>Furthermore, during the evaluation of the <var>action</var> the context name in
the <tt>curcontext</tt> parameter is altered to append the same string that is
stored in the <tt>context</tt> parameter.
</p>
<p>The option <tt>-C</tt> tells <tt>_arguments</tt> to modify the <tt>curcontext</tt>
parameter for an action of the form ‘<tt>-></tt><var>state</var>’. This is the
standard parameter used to keep track of the current context. Here it
(and not the <tt>context</tt> array) should be made local to the calling
function to avoid passing back the modified value and should be
initialised to the current value at the start of the function:
</p>
<div class="example">
<pre class="example">local curcontext="$curcontext"
</pre></div>
<p>This is useful where it is not possible for multiple states to be valid
together.
</p>
<p><em>Specifying multiple sets of options</em>
</p>
<p>It is possible to specify multiple sets of options and
arguments with the sets separated by single hyphens. The specifications
before the first hyphen (if any) are shared by all the remaining sets.
The first word in every other set provides a name for the
set which may appear in exclusion lists in specifications,
either alone or before one of the possible values described above.
In the second case a ‘<tt>-</tt>’ should appear between this name and the
remainder.
</p>
<p>For example:
</p>
<div class="example">
<pre class="example">_arguments \
-a \
- set1 \
-c \
- set2 \
-d \
':arg:(x2 y2)'
</pre></div>
<p>This defines two sets. When the command line contains the option
‘<tt>-c</tt>’, the ‘<tt>-d</tt>’ option and the argument will not be considered
possible completions. When it contains ‘<tt>-d</tt>’ or an argument, the
option ‘<tt>-c</tt>’ will not be considered. However, after ‘<tt>-a</tt>’
both sets will still be considered valid.
</p>
<p>If the name given for one of the mutually exclusive sets is of the form
‘<tt>(</tt><var>name</var><tt>)</tt>’ then only one value from each set will ever
be completed; more formally, all specifications are mutually
exclusive to all other specifications in the same set. This is
useful for defining multiple sets of options which are mutually
exclusive and in which the options are aliases for each other. For
example:
</p>
<div class="example">
<pre class="example">_arguments \
-a -b \
- '(compress)' \
{-c,--compress}'[compress]' \
- '(uncompress)' \
{-d,--decompress}'[decompress]'
</pre></div>
<p>As the completion code has to parse the command line separately for each
set this form of argument is slow and should only be used when necessary.
A useful alternative is often an option specification with rest-arguments
(as in ‘<tt>-foo:*:...</tt>’); here the option <tt>-foo</tt> swallows up all
remaining arguments as described by the <var>optarg</var> definitions.
</p>
<p><em>Deriving <var>spec</var> forms from the help output</em>
</p>
<p>The option ‘<tt>-</tt><tt>-</tt>’ allows <tt>_arguments</tt> to work out the names of long
options that support the ‘<tt>-</tt><tt>-help</tt>’ option which is standard in many
GNU commands. The command word is called with the argument
‘<tt>-</tt><tt>-help</tt>’ and the output examined for option names. Clearly, it can
be dangerous to pass this to commands which may not support this option as
the behaviour of the command is unspecified.
</p>
<p>In addition to options, ‘<tt>_arguments -</tt><tt>-</tt>’ will try to deduce the
types of arguments available for options when the form
‘<tt>-</tt><tt>-</tt><var>opt</var><tt>=</tt><var>val</var>’ is valid. It is also possible to provide
hints by examining the help text of the command and adding <var>helpspec</var> of
the form ‘<var>pattern</var><tt>:</tt><var>message</var><tt>:</tt><var>action</var>’; note that other
<tt>_arguments</tt> <var>spec</var> forms are not used. The <var>pattern</var> is matched
against the help text for an option, and if it matches the <var>message</var> and
<var>action</var> are used as for other argument specifiers. The special case
of ‘<tt>*:</tt>’ means both <var>message</var> and <var>action</var> are empty, which has
the effect of causing options having no description in the help output to
be ordered in listings ahead of options that have a description.
</p>
<p>For example:
</p>
<div class="example">
<pre class="example">_arguments -- '*\*:toggle:(yes no)' \
'*=FILE*:file:_files' \
'*=DIR*:directory:_files -/' \
'*=PATH*:directory:_files -/'
</pre></div>
<p>Here, ‘<tt>yes</tt>’ and ‘<tt>no</tt>’ will be completed as the argument of
options whose description ends in a star; file names will be completed for
options that contain the substring ‘<tt>=FILE</tt>’ in the description; and
directories will be completed for options whose description contains
‘<tt>=DIR</tt>’ or ‘<tt>=PATH</tt>’. The last three are in fact the default and so
need not be given explicitly, although it is possible to override the use
of these patterns. A typical help text which uses this feature is:
</p>
<div class="example">
<pre class="example"> -C, --directory=DIR change to directory DIR
</pre></div>
<p>so that the above specifications will cause directories to be completed
after ‘<tt>-</tt><tt>-directory</tt>’, though not after ‘<tt>-C</tt>’.
</p>
<p>Note also that <tt>_arguments</tt> tries to find out automatically if the
argument for an option is optional. This can be specified explicitly by
doubling the colon before the <var>message</var>.
</p>
<p>If the <var>pattern</var> ends in ‘<tt>(-)</tt>’, this will be removed from the
pattern and the <var>action</var> will be used only directly after the
‘<tt>=</tt>’, not in the next word. This is the behaviour of a normal
specification defined with the form ‘<tt>=-</tt>’.
</p>
<p>The ‘<tt>_arguments -</tt><tt>-</tt>’ can be followed by the option ‘<tt>-i</tt>
<var>patterns</var>’ to give patterns for options which are not to be
completed. The patterns can be given as the name of an array parameter
or as a literal list in parentheses. For example,
</p>
<div class="example">
<pre class="example">_arguments -- -i \
"(--(en|dis)able-FEATURE*)"
</pre></div>
<p>will cause completion to ignore the options
‘<tt>-</tt><tt>-enable-FEATURE</tt>’ and ‘<tt>-</tt><tt>-disable-FEATURE</tt>’ (this example is
useful with GNU <tt>configure</tt>).
</p>
<p>The ‘<tt>_arguments -</tt><tt>-</tt>’ form can also be followed by the option ‘<tt>-s</tt>
<var>pair</var>’ to describe option aliases. The <var>pair</var> consists of a list
of alternating patterns and corresponding replacements, enclosed in parens
and quoted so that it forms a single argument word in the <tt>_arguments</tt>
call.
</p>
<p>For example, some <tt>configure</tt>-script help output describes options only
as ‘<tt>-</tt><tt>-enable-foo</tt>’, but the script also accepts the negated form
‘<tt>-</tt><tt>-disable-foo</tt>’. To allow completion of the second form:
</p>
<div class="example">
<pre class="example">_arguments -- -s "((#s)--enable- --disable-)"
</pre></div>
<p><em>Miscellaneous notes</em>
</p>
<p>Finally, note that <tt>_arguments</tt> generally expects to be the primary
function handling any completion for which it is used. It may have side
effects which change the treatment of any matches added by other functions
called after it. To combine <tt>_arguments</tt> with other functions, those
functions should be called either before <tt>_arguments</tt>, as an <var>action</var>
within a <var>spec</var>, or in handlers for ‘<tt>-></tt><var>state</var>’ actions.
</p>
<p>Here is a more general example of the use of <tt>_arguments</tt>:
</p>
<div class="example">
<pre class="example">_arguments '-l+:left border:' \
'-format:paper size:(letter A4)' \
'*-copy:output file:_files::resolution:(300 600)' \
':postscript file:_files -g \*.\(ps\|eps\)' \
'*:page number:'
</pre></div>
<p>This describes three options: ‘<tt>-l</tt>’, ‘<tt>-format</tt>’, and
‘<tt>-copy</tt>’. The first takes one argument described as ‘<var>left
border</var>’ for which no completion will be offered because of the empty
action. Its argument may come directly after the ‘<tt>-l</tt>’ or it may be
given as the next word on the line.
</p>
<p>The ‘<tt>-format</tt>’ option takes one
argument in the next word, described as ‘<var>paper size</var>’ for which
only the strings ‘<tt>letter</tt>’ and ‘<tt>A4</tt>’ will be completed.
</p>
<p>The ‘<tt>-copy</tt>’ option may appear more than once on the command line and
takes two arguments. The first is mandatory and will be completed as a
filename. The second is optional (because of the second colon before
the description ‘<var>resolution</var>’) and will be completed from the strings
‘<tt>300</tt>’ and ‘<tt>600</tt>’.
</p>
<p>The last two descriptions say what should be completed as
arguments. The first describes the first argument as a
‘<var>postscript file</var>’ and makes files ending in ‘<tt>ps</tt>’ or ‘<tt>eps</tt>’
be completed. The last description gives all other arguments the
description ‘<var>page numbers</var>’ but does not offer completions.
</p>
<a name="index-_005fcache_005finvalid"></a>
</dd>
<dt><tt>_cache_invalid</tt> <var>cache_identifier</var></dt>
<dd><p>This function returns status zero if the completions cache corresponding to
the given cache identifier needs rebuilding. It determines this by
looking up the <tt>cache-policy</tt> style for the current context.
This should provide a function name which is run with the full path to the
relevant cache file as the only argument.
</p>
<p>Example:
</p>
<div class="example">
<pre class="example">_example_caching_policy () {
# rebuild if cache is more than a week old
local -a oldp
oldp=( "$1"(Nm+7) )
(( $#oldp ))
}
</pre></div>
<a name="index-_005fcall_005ffunction"></a>
</dd>
<dt><tt>_call_function</tt> <var>return</var> <var>name</var> [ <var>arg</var> ... ]</dt>
<dd><p>If a function <var>name</var> exists, it is called with the arguments
<var>arg</var>s. The <var>return</var> argument gives the name of a parameter in which
the return status from the function <var>name</var> should be stored; if <var>return</var>
is empty or a single hyphen it is ignored.
</p>
<p>The return status of <tt>_call_function</tt> itself is zero if the function
<var>name</var> exists and was called and non-zero otherwise.
</p>
<a name="index-_005fcall_005fprogram"></a>
</dd>
<dt><tt>_call_program</tt> <var>tag</var> <var>string</var> ...</dt>
<dd><p>This function provides a mechanism for the user to override the use of an
external command. It looks up the <tt>command</tt> style with the supplied
<var>tag</var>. If the style is set, its value is used as the command to
execute. The <var>string</var>s from the call to <tt>_call_program</tt>, or from the
style if set, are concatenated with spaces between them and the resulting
string is evaluated. The return status is the return status of the command
called.
</p>
<a name="index-_005fcombination"></a>
</dd>
<dt><tt>_combination</tt> [ <tt>-s</tt> <var>pattern</var> ] <var>tag</var> <var>style</var> <var>spec</var> ... <var>field</var> <var>opts</var> ...</dt>
<dd><p>This function is used to complete combinations of values, for example
pairs of hostnames and usernames. The <var>style</var> argument gives the style
which defines the pairs; it is looked up in a context with the <var>tag</var>
specified.
</p>
<p>The style name consists of field names separated by hyphens, for example
‘<tt>users-hosts-ports</tt>’. For each field for a value is already known, a
<var>spec</var> of the form ‘<var>field</var><tt>=</tt><var>pattern</var>’ is given. For example,
if the command line so far specifies a user ‘<tt>pws</tt>’, the argument
‘<tt>users=pws</tt>’ should appear.
</p>
<p>The next argument with no equals sign is taken as the name of the field
for which completions should be generated (presumably not one of the
<var>field</var>s for which the value is known).
</p>
<p>The matches generated will be taken from the value of the style. These
should contain the possible values for the combinations in the appropriate
order (users, hosts, ports in the example above). The different fields
the values for the different fields are separated by colons. This
can be altered with the option <tt>-s</tt> to <tt>_combination</tt> which specifies a
pattern. Typically this is a character class, as for example
‘<tt>-s "[:@]"</tt>’ in the case of the <tt>users-hosts</tt> style. Each
‘<var>field</var><tt>=</tt><var>pattern</var>’ specification restricts the
completions which apply to elements of the style with appropriately
matching fields.
</p>
<p>If no style with the given name is defined for the given tag,
or if none of the strings in style’s value match, but a
function name of the required field preceded by an
underscore is defined, that function will be called to generate the
matches. For example, if there is no ‘<tt>users-hosts-ports</tt>’ or no
matching hostname when a host is required, the function ‘<tt>_hosts</tt>’ will
automatically be called.
</p>
<p>If the same name is used for more than one field, in both the
‘<var>field</var><tt>=</tt><var>pattern</var>’ and the argument that gives the name of the
field to be completed, the number of the field (starting with one) may
be given after the fieldname, separated from it by a colon.
</p>
<p>All arguments after the required field name are passed to
<tt>compadd</tt> when generating matches from the style value, or to
the functions for the fields if they are called.
</p>
<a name="index-_005fdescribe"></a>
</dd>
<dt><tt>_describe </tt>[<tt>-12JVx</tt>] [ <tt>-oO</tt> | <tt>-t</tt> <var>tag</var> ] <var>descr</var> <var>name1</var> [ <var>name2</var> ] [ <var>opt</var> ... ]</dt>
<dt><tt> </tt>[ <tt>-</tt><tt>-</tt> <var>name1</var> [ <var>name2</var> ] [ <var>opt</var> ... ] ... ]</dt>
<dd><p>This function associates completions with descriptions.
Multiple groups separated by <tt>-</tt><tt>-</tt> can be supplied, potentially with
different completion options <var>opt</var>s.
</p>
<p>The <var>descr</var> is taken as a string to display above the matches if the
<tt>format</tt> style for the <tt>descriptions</tt> tag is set. This is followed by
one or two names of arrays followed by options to pass to <tt>compadd</tt>. The
first array contains the possible completions with their descriptions in
the form ‘<var>completion</var><tt>:</tt><var>description</var>’. Any literal colons in
<var>completion</var> must be quoted with a backslash. If a second array is
given, it should have the same number of elements as the first; in this
case the corresponding elements are added as possible completions instead
of the <var>completion</var> strings from the first array. The completion list
will retain the descriptions from the first array. Finally, a set of
completion options can appear.
</p>
<p>If the option ‘<tt>-o</tt>’ appears before the first argument, the matches added
will be treated as names of command options (N.B. not shell options),
typically following a ‘<tt>-</tt>’, ‘<tt>-</tt><tt>-</tt>’ or ‘<tt>+</tt>’ on the command
line. In this case <tt>_describe</tt> uses the <tt>prefix-hidden</tt>,
<tt>prefix-needed</tt> and <tt>verbose</tt> styles to find out if the strings should
be added as completions and if the descriptions should be shown. Without
the ‘<tt>-o</tt>’ option, only the <tt>verbose</tt> style is used to decide how
descriptions are shown. If ‘<tt>-O</tt>’ is used instead of ‘<tt>-o</tt>’, command
options are completed as above but <tt>_describe</tt> will not handle the
<tt>prefix-needed</tt> style.
</p>
<p>With the <tt>-t</tt> option a <var>tag</var> can be specified. The default is
‘<tt>values</tt>’ or, if the <tt>-o</tt> option is given, ‘<tt>options</tt>’.
</p>
<p>The options <tt>-1</tt>, <tt>-2</tt>, <tt>-J</tt>, <tt>-V</tt>, <tt>-x</tt> are passed to
<tt>_next_label</tt>.
</p>
<p>If selected by the <tt>list-grouped</tt> style, strings with the same
description will appear together in the list.
</p>
<p><tt>_describe</tt> uses the <tt>_all_labels</tt> function to generate the matches, so
it does not need to appear inside a loop over tag labels.
</p>
<a name="index-_005fdescription"></a>
</dd>
<dt><tt>_description</tt> [ <tt>-x</tt> ] [ <tt>-12VJ</tt> ] <var>tag</var> <var>name</var> <var>descr</var> [ <var>spec</var> ... ]</dt>
<dd><p>This function is not to be confused with the previous one; it is used as
a helper function for creating options to <tt>compadd</tt>. It is buried
inside many of the higher level completion functions and so often does
not need to be called directly.
</p>
<p>The styles listed below are tested in the current context using the
given <var>tag</var>. The resulting options for <tt>compadd</tt> are put into the
array named <var>name</var> (this is traditionally ‘<tt>expl</tt>’, but this
convention is not enforced). The description for the corresponding set
of matches is passed to the function in <var>descr</var>.
</p>
<p>The styles tested are: <tt>format</tt>, <tt>hidden</tt>, <tt>matcher</tt>,
<tt>ignored-patterns</tt> and <tt>group-name</tt>. The <tt>format</tt> style is first
tested for the given <var>tag</var> and then for the <tt>descriptions</tt> tag if
no value was found, while the remainder are only tested for the tag
given as the first argument. The function also calls <tt>_setup</tt>
which tests some more styles.
</p>
<p>The string returned by the <tt>format</tt> style (if any) will be modified so
that the sequence ‘<tt>%d</tt>’ is replaced by the <var>descr</var> given as the third
argument without any leading or trailing white space. If, after
removing the white space, the <var>descr</var> is the empty string, the format
style will not be used and the options put into the <var>name</var> array will
not contain an explanation string to be displayed above the matches.
</p>
<p>If <tt>_description</tt> is called with more than three arguments,
the additional <var>spec</var>s should be of the form ‘<var>char</var><tt>:</tt><var>str</var>’.
These supply escape sequence replacements for the <tt>format</tt> style:
every appearance of ‘<tt>%</tt><var>char</var>’ will be
replaced by <var>string</var>.
</p>
<p>If the <tt>-x</tt> option is given, the description will be passed to
<tt>compadd</tt> using the <tt>-x</tt> option instead of the default <tt>-X</tt>. This
means that the description will be displayed even if there are no
corresponding matches.
</p>
<p>The options placed in the array <var>name</var> take account of the
<tt>group-name</tt> style, so matches are placed in a separate group where
necessary. The group normally has its elements sorted (by passing the
option <tt>-J</tt> to <tt>compadd</tt>), but if an option starting with ‘<tt>-V</tt>’,
‘<tt>-J</tt>’, ‘<tt>-1</tt>’, or ‘<tt>-2</tt>’ is passed to <tt>_description</tt>, that
option will be included in the array. Hence it is possible for the
completion group to be unsorted by giving the option ‘<tt>-V</tt>’,
‘<tt>-1V</tt>’, or ‘<tt>-2V</tt>’.
</p>
<p>In most cases, the function will be used like this:
</p>
<div class="example">
<pre class="example">local expl
_description files expl file
compadd "$expl[@]" - "$files[@]"
</pre></div>
<p>Note the use of the parameter <tt>expl</tt>, the hyphen, and the list of
matches. Almost all calls to <tt>compadd</tt> within the completion system use
a similar format; this ensures that user-specified styles are correctly
passed down to the builtins which implement the internals of completion.
</p>
<a name="index-_005fdispatch"></a>
</dd>
<dt><tt>_dispatch</tt> <var>context string</var> ...</dt>
<dd><p>This sets the current context to <var>context</var> and looks for completion
functions to handle this context by hunting through the list of command
names or special contexts (as described above for <tt>compdef</tt>)
given as <var>string</var>s. The first completion function to be defined
for one of the contexts in the list is used to generate matches.
Typically, the last <var>string</var> is <tt>-default-</tt> to cause the function
for default completion to be used as a fallback.
</p>
<p>The function sets the parameter
<tt>$service</tt> to the <var>string</var> being tried, and sets
the <var>context/command</var> field (the fourth) of the <tt>$curcontext</tt>
parameter to the <var>context</var> given as the first argument.
</p>
<a name="index-_005ffiles"></a>
</dd>
<dt><tt>_files</tt></dt>
<dd><p>The function <tt>_files</tt> calls <tt>_path_files</tt> with all the arguments it
was passed except for <tt>-g</tt> and <tt>-/</tt>. The use of these two options
depends on the setting of the <tt>file-patterns</tt> style.
</p>
<p>This function accepts the full set of options allowed by
<tt>_path_files</tt>, described below.
</p>
<a name="index-_005fgnu_005fgeneric"></a>
</dd>
<dt><tt>_gnu_generic</tt></dt>
<dd><p>This function is a simple wrapper around the <tt>_arguments</tt> function
described above. It can be used to determine automatically the long
options understood by commands that produce a list when passed the
option ‘<tt>-</tt><tt>-help</tt>’. It is intended to be used as a top-level
completion function in its own right. For example, to enable option
completion for the commands <tt>foo</tt> and <tt>bar</tt>, use
</p>
<div class="example">
<pre class="example">compdef _gnu_generic foo bar
</pre></div>
<p>after the call to <tt>compinit</tt>.
</p>
<p>The completion system as supplied is conservative in its use of this
function, since it is important to be sure the command understands the
option ‘<tt>-</tt><tt>-help</tt>’.
</p>
<a name="index-_005fguard"></a>
</dd>
<dt><tt>_guard</tt> [ <var>options</var> ] <var>pattern descr</var></dt>
<dd><p>This function displays <var>descr</var> if <var>pattern</var> matches the string to
be completed. It is intended to be used in the <var>action</var> for the
specifications passed to <tt>_arguments</tt> and similar functions.
</p>
<p>The return status is zero if the message was displayed and the word to
complete is not empty, and non-zero otherwise.
</p>
<p>The <var>pattern</var> may be preceded by any of the options understood by
<tt>compadd</tt> that are passed down from <tt>_description</tt>, namely <tt>-M</tt>,
<tt>-J</tt>, <tt>-V</tt>, <tt>-1</tt>, <tt>-2</tt>, <tt>-n</tt>, <tt>-F</tt> and <tt>-X</tt>. All of these
options will be ignored. This fits in conveniently with the
argument-passing conventions of actions for <tt>_arguments</tt>.
</p>
<p>As an example, consider a command taking the options <tt>-n</tt> and
<tt>-none</tt>, where <tt>-n</tt> must be followed by a numeric value in the
same word. By using:
</p>
<div class="example">
<pre class="example">_arguments '-n-: :_guard "[0-9]#" "numeric value"' '-none'
</pre></div>
<p><tt>_arguments</tt> can be made to both display the message ‘<tt>numeric
value</tt>’ and complete options after ‘<tt>-n<TAB></tt>’. If the ‘<tt>-n</tt>’ is
already followed by one or more digits (the pattern passed to
<tt>_guard</tt>) only the message will be displayed; if the ‘<tt>-n</tt>’ is
followed by another character, only options are completed.
</p>
<a name="index-_005fmessage"></a>
</dd>
<dt><tt>_message</tt> [ <tt>-r12</tt> ] [ <tt>-VJ</tt> <var>group</var> ] <var>descr</var></dt>
<dt><tt>_message -e</tt> [ <var>tag</var> ] <var>descr</var></dt>
<dd><p>The <var>descr</var> is used in the same way as the third
argument to the <tt>_description</tt> function, except that the resulting
string will always be shown whether or not matches were
generated. This is useful for displaying a help message in places where
no completions can be generated.
</p>
<p>The <tt>format</tt> style is examined with the <tt>messages</tt> tag to find a
message; the usual tag, <tt>descriptions</tt>, is used only if the style is
not set with the former.
</p>
<p>If the <tt>-r</tt> option is given, no style is used; the <var>descr</var> is
taken literally as the string to display. This is most useful
when the <var>descr</var> comes from a pre-processed argument list
which already contains an expanded description.
</p>
<p>The <tt>-12VJ</tt> options and the <var>group</var> are passed to <tt>compadd</tt> and
hence determine the group the message string is added to.
</p>
<p>The second <tt>-e</tt> form gives a description for completions with the tag
<var>tag</var> to be shown even if there are no matches for that tag. This form
is called by <tt>_arguments</tt> in the event that there is no action for an
option specification. The tag can be omitted and if so the tag is taken
from the parameter <tt>$curtag</tt>; this is maintained by the completion
system and so is usually correct. Note that if there are no matches at
the time this function is called, <tt>compstate[insert]</tt> is cleared, so
additional matches generated later are not inserted on the command line.
</p>
<a name="index-_005fmulti_005fparts"></a>
</dd>
<dt><tt>_multi_parts</tt> <var>sep</var> <var>array</var></dt>
<dd><p>The argument <var>sep</var> is a separator character.
The <var>array</var> may be either the
name of an array parameter or a literal array in the form
‘<tt>(foo bar</tt><tt>)</tt>’, a parenthesised list of words separated
by whitespace. The possible completions are the
strings from the array. However, each chunk delimited by <var>sep</var> will be
completed separately. For example, the <tt>_tar</tt> function uses
‘<tt>_multi_parts</tt> <tt>/</tt> <var>patharray</var>’ to complete partial file paths
from the given array of complete file paths.
</p>
<p>The <tt>-i</tt> option causes <tt>_multi_parts</tt> to insert a unique match even
if that requires multiple separators to be inserted. This is not usually
the expected behaviour with filenames, but certain other types of
completion, for example those with a fixed set of possibilities, may be
more suited to this form.
</p>
<p>Like other utility functions, this function accepts the ‘<tt>-V</tt>’,
‘<tt>-J</tt>’, ‘<tt>-1</tt>’, ‘<tt>-2</tt>’, ‘<tt>-n</tt>’, ‘<tt>-f</tt>’, ‘<tt>-X</tt>’, ‘<tt>-M</tt>’,
‘<tt>-P</tt>’, ‘<tt>-S</tt>’, ‘<tt>-r</tt>’, ‘<tt>-R</tt>’, and ‘<tt>-q</tt>’ options and passes
them to the <tt>compadd</tt> builtin.
</p>
<a name="index-_005fnext_005flabel"></a>
</dd>
<dt><tt>_next_label</tt> [ <tt>-x</tt> ] [ <tt>-12VJ</tt> ] <var>tag</var> <var>name</var> <var>descr</var> [ <var>option</var> ... ]</dt>
<dd><p>This function is used to implement the loop over different tag
labels for a particular tag as described above for the <tt>tag-order</tt>
style. On each call it checks to see if there are any more tag labels; if
there is it returns status zero, otherwise non-zero.
As this function requires a current tag to be set, it must always follow
a call to <tt>_tags</tt> or <tt>_requested</tt>.
</p>
<p>The <tt>-x12VJ</tt> options and the first three arguments are passed to the
<tt>_description</tt> function. Where appropriate the <var>tag</var> will be
replaced by a tag label in this call. Any description given in
the <tt>tag-order</tt> style is preferred to the <var>descr</var> passed to
<tt>_next_label</tt>.
</p>
<p>The <var>option</var>s given after the <var>descr</var>
are set in the parameter given by <var>name</var>, and hence are to be passed
to <tt>compadd</tt> or whatever function is called to add the matches.
</p>
<p>Here is a typical use of this function for the tag <tt>foo</tt>. The call to
<tt>_requested</tt> determines if tag <tt>foo</tt> is required at all; the loop
over <tt>_next_label</tt> handles any labels defined for the tag in the
<tt>tag-order</tt> style.
</p>
<div class="example">
<pre class="example">local expl ret=1
...
if _requested foo; then
...
while _next_label foo expl '...'; do
compadd "$expl[@]" ... && ret=0
done
...
fi
return ret
</pre></div>
<a name="index-_005fnormal"></a>
</dd>
<dt><tt>_normal</tt></dt>
<dd><p>This is the standard function called to handle completion outside
any special <tt>-</tt><var>context</var><tt>-</tt>. It is called both to complete the command
word and also the arguments for a command. In the second case,
<tt>_normal</tt> looks for a special completion for that command, and if
there is none it uses the completion for the <tt>-default-</tt> context.
</p>
<p>A second use is to reexamine the command line specified by the <tt>$words</tt>
array and the <tt>$CURRENT</tt> parameter after those have been modified.
For example, the function <tt>_precommand</tt>, which
completes after pre-command specifiers such as <tt>nohup</tt>, removes the
first word from the <tt>words</tt> array, decrements the <tt>CURRENT</tt> parameter,
then calls <tt>_normal</tt> again. The effect is that ‘<tt>nohup</tt> <var>cmd ...</var>’
is treated in the same way as ‘<var>cmd ...</var>’.
</p>
<p>If the command name matches one of the patterns given by one of the
options <tt>-p</tt> or <tt>-P</tt> to <tt>compdef</tt>, the corresponding completion
function is called and then the parameter <tt>_compskip</tt> is
checked. If it is set completion is terminated at that point even if
no matches have been found. This is the same effect as in the
<tt>-first-</tt> context.
</p>
<a name="index-_005foptions"></a>
</dd>
<dt><tt>_options</tt></dt>
<dd><p>This can be used to complete the names of shell options. It provides a
matcher specification that ignores a leading ‘<tt>no</tt>’, ignores
underscores and allows upper-case letters to
match their lower-case counterparts (for example, ‘<tt>glob</tt>’,
‘<tt>noglob</tt>’, ‘<tt>NO_GLOB</tt>’ are all completed). Any arguments
are propagated to the <tt>compadd</tt> builtin.
</p>
<a name="index-_005foptions_005fset"></a>
<a name="index-_005foptions_005funset"></a>
</dd>
<dt><tt>_options_set</tt> and <tt>_options_unset</tt></dt>
<dd><p>These functions complete only set or unset options, with the same
matching specification used in the <tt>_options</tt> function.
</p>
<p>Note that you need to uncomment a few lines in the <tt>_main_complete</tt>
function for these functions to work properly. The lines in question
are used to store the option settings in effect before the completion
widget locally sets the options it needs. Hence these functions are not
generally used by the completion system.
</p>
<a name="index-_005fparameters"></a>
</dd>
<dt><tt>_parameters</tt></dt>
<dd><p>This is used to complete the names of shell parameters.
</p>
<p>The option ‘<tt>-g</tt> <var>pattern</var>’ limits the completion to parameters
whose type matches the <var>pattern</var>. The type of a parameter is that
shown by ‘<tt>print ${(t)</tt><var>param</var><tt>}</tt>’, hence judicious use of
‘<tt>*</tt>’ in <var>pattern</var> is probably necessary.
</p>
<p>All other arguments are passed to the <tt>compadd</tt> builtin.
</p>
<a name="index-_005fpath_005ffiles"></a>
</dd>
<dt><tt>_path_files</tt></dt>
<dd><p>This function is used throughout the completion system
to complete filenames. It allows completion of partial paths. For
example, the string ‘<tt>/u/i/s/sig</tt>’ may be completed to
‘<tt>/usr/include/sys/signal.h</tt>’.
</p>
<p>The options accepted by both <tt>_path_files</tt> and <tt>_files</tt> are:
</p>
<dl compact="compact">
<dt><tt>-f</tt></dt>
<dd><p>Complete all filenames. This is the default.
</p>
</dd>
<dt><tt>-/</tt></dt>
<dd><p>Specifies that only directories should be completed.
</p>
</dd>
<dt><tt>-g</tt> <var>pattern</var></dt>
<dd><p>Specifies that only files matching the <var>pattern</var> should be completed.
</p>
</dd>
<dt><tt>-W</tt> <var>paths</var></dt>
<dd><p>Specifies path prefixes that are to be prepended to the string from the
command line to generate the filenames but that should not be inserted
as completions nor shown in completion listings. Here, <var>paths</var> may be
the name of an array parameter, a literal list of paths enclosed in
parentheses or an absolute pathname.
</p>
</dd>
<dt><tt>-F</tt> <var>ignored-files</var></dt>
<dd><p>This behaves as for the corresponding option to the <tt>compadd</tt> builtin.
It gives direct control over which
filenames should be ignored. If the option is not present, the
<tt>ignored-patterns</tt> style is used.
</p>
</dd>
</dl>
<p>Both <tt>_path_files</tt> and <tt>_files</tt> also accept the following options
which are passed to <tt>compadd</tt>: ‘<tt>-J</tt>’, ‘<tt>-V</tt>’,
‘<tt>-1</tt>’, ‘<tt>-2</tt>’, ‘<tt>-n</tt>’, ‘<tt>-X</tt>’, ‘<tt>-M</tt>’, ‘<tt>-P</tt>’, ‘<tt>-S</tt>’,
‘<tt>-q</tt>’, ‘<tt>-r</tt>’, and ‘<tt>-R</tt>’.
</p>
<p>Finally, the <tt>_path_files</tt> function uses the styles <tt>expand</tt>,
<tt>ambiguous</tt>, <tt>special-dirs</tt>, <tt>list-suffixes</tt> and <tt>file-sort</tt>
described above.
</p>
<a name="index-_005fpick_005fvariant"></a>
</dd>
<dt><tt>_pick_variant </tt>[ <tt>-b</tt> <var>builtin-label</var> ] [ <tt>-c</tt> <var>command</var> ] [ <tt>-r</tt> <var>name</var> ]</dt>
<dt><tt> </tt><var>label</var><tt>=</tt><var>pattern</var> ... <var>label</var> [ <var>arg</var> ... ]</dt>
<dd><p>This function is used to resolve situations where a single command name
requires more than one type of handling, either because it
has more than one variant or because there is a name clash between two
different commands.
</p>
<p>The command to run is taken from the first element of the array
<tt>words</tt> unless this is overridden by the option <tt>-c</tt>. This command
is run and its output is compared with a series of patterns. Arguments
to be passed to the command can be specified at the end after all the
other arguments. The patterns to try in order are given by the arguments
<var>label</var><tt>=</tt><var>pattern</var>; if the output of ‘<var>command</var> <var>arg</var>
...’ contains <var>pattern</var>, then <var>label</var> is selected as the label
for the command variant. If none of the patterns match, the final
command label is selected and status 1 is returned.
</p>
<p>If the ‘<tt>-b</tt> <var>builtin-label</var>’ is given, the command is tested to
see if it is provided as a shell builtin, possibly autoloaded; if so,
the label <var>builtin-label</var> is selected as the label for the variant.
</p>
<p>If the ‘<tt>-r</tt> <var>name</var>’ is given, the <var>label</var> picked is stored in
the parameter named <var>name</var>.
</p>
<p>The results are also cached in the <tt>_cmd_variant</tt> associative array
indexed by the name of the command run.
</p>
<a name="index-_005fregex_005farguments"></a>
</dd>
<dt><tt>_regex_arguments</tt> <var>name</var> <var>spec</var> ...</dt>
<dd><p>This function generates a completion function <var>name</var> which matches
the specifications <var>spec</var>s, a set of regular expressions as
described below. After running <tt>_regex_arguments</tt>, the function
<var>name</var> should be called as a normal completion function.
The pattern to be matched is given by the contents of
the <tt>words</tt> array up to the current cursor position joined together
with null characters; no quotation is applied.
</p>
<p>The arguments are grouped as sets of alternatives separated by ‘<tt>|</tt>’,
which are tried one after the other until one matches. Each alternative
consists of a one or more specifications which are tried left to right,
with each pattern matched being stripped in turn from the command line
being tested, until all of the group succeeds or until one fails; in the
latter case, the next alternative is tried. This structure can be
repeated to arbitrary depth by using parentheses; matching proceeds from
inside to outside.
</p>
<p>A special procedure is applied if no test succeeds but the remaining
command line string contains no null character (implying the remaining
word is the one for which completions are to be generated). The
completion target is restricted to the remaining word and any
<var>action</var>s for the corresponding patterns are executed. In this case,
nothing is stripped from the command line string. The order of
evaluation of the <var>action</var>s can be determined by the <tt>tag-order</tt>
style; the various formats supported by <tt>_alternative</tt> can be used
in <var>action</var>. The <var>descr</var> is used for setting up the array
parameter <tt>expl</tt>.
</p>
<p>Specification arguments take one of following forms, in which
metacharacters such as ‘<tt>(</tt>’, ‘<tt>)</tt>’, ‘<tt>#</tt>’ and ‘<tt>|</tt>’
should be quoted.
</p>
<dl compact="compact">
<dt><tt>/</tt><var>pattern</var><tt>/</tt> [<tt>%</tt><var>lookahead</var><tt>%</tt>] [<tt>-</tt><var>guard</var>] [<tt>:</tt><var>tag</var><tt>:</tt><var>descr</var><tt>:</tt><var>action</var>]</dt>
<dd><p>This is a single primitive component.
The function tests whether the combined pattern
‘<tt>(#b)((#B)</tt><var>pattern</var><tt>)</tt><var>lookahead</var><tt>*</tt>’ matches
the command line string. If so, ‘<var>guard</var>’ is evaluated and
its return status is examined to determine if the test has succeeded.
The <var>pattern</var> string ‘<tt>[]</tt>’ is guaranteed never to match.
The <var>lookahead</var> is not stripped from the command line before the next
pattern is examined.
</p>
<p>The argument starting with <tt>:</tt> is used in the same manner as an argument to
<tt>_alternative</tt>.
</p>
<p>A component is used as follows: <var>pattern</var> is tested to
see if the component already exists on the command line. If
it does, any following specifications are examined to find something to
complete. If a component is reached but no such pattern exists yet on the
command line, the string containing the <var>action</var> is used to generate
matches to insert at that point.
</p>
</dd>
<dt><tt>/</tt><var>pattern</var><tt>/+</tt> [<tt>%</tt><var>lookahead</var><tt>%</tt>] [<tt>-</tt><var>guard</var>] [<tt>:</tt><var>tag</var><tt>:</tt><var>descr</var><tt>:</tt><var>action</var>]</dt>
<dd><p>This is similar to ‘<tt>/</tt><var>pattern</var><tt>/</tt> ...’ but the left part of the
command line string (i.e. the part already matched by previous patterns)
is also considered part of the completion target.
</p>
</dd>
<dt><tt>/</tt><var>pattern</var><tt>/-</tt> [<tt>%</tt><var>lookahead</var><tt>%</tt>] [<tt>-</tt><var>guard</var>] [<tt>:</tt><var>tag</var><tt>:</tt><var>descr</var><tt>:</tt><var>action</var>]</dt>
<dd><p>This is similar to ‘<tt>/</tt><var>pattern</var><tt>/</tt> ...’ but the <var>action</var>s of the
current and previously matched patterns are ignored even if the
following ‘<var>pattern</var>’ matches the empty string.
</p>
</dd>
<dt><tt>(</tt> <var>spec</var> <tt>)</tt></dt>
<dd><p>Parentheses may be used to groups <var>spec</var>s; note each parenthesis
is a single argument to <tt>_regex_arguments</tt>.
</p>
</dd>
<dt><var>spec</var> <tt>#</tt></dt>
<dd><p>This allows any number of repetitions of <var>spec</var>.
</p>
</dd>
<dt><var>spec</var> <var>spec</var></dt>
<dd><p>The two <var>spec</var>s are to be matched one after the other as described
above.
</p>
</dd>
<dt><var>spec</var> <tt>|</tt> <var>spec</var></dt>
<dd><p>Either of the two <var>spec</var>s can be matched.
</p>
</dd>
</dl>
<p>The function <tt>_regex_words</tt> can be used as a helper function to
generate matches for a set of alternative words possibly with
their own arguments as a command line argument.
</p>
<p>Examples:
</p>
<div class="example">
<pre class="example">_regex_arguments _tst /$'[^\0]#\0'/ \
/$'[^\0]#\0'/ :'compadd aaa'
</pre></div>
<p>This generates a function <tt>_tst</tt> that completes <tt>aaa</tt> as its only
argument. The <var>tag</var> and <var>description</var> for the action have been
omitted for brevity (this works but is not recommended in normal use).
The first component matches the command word, which is arbitrary; the
second matches any argument. As the argument is also arbitrary, any
following component would not depend on <tt>aaa</tt> being present.
</p>
<div class="example">
<pre class="example">_regex_arguments _tst /$'[^\0]#\0'/ \
/$'aaa\0'/ :'compadd aaa'
</pre></div>
<p>This is a more typical use; it is similar, but any following patterns
would only match if <tt>aaa</tt> was present as the first argument.
</p>
<div class="example">
<pre class="example">_regex_arguments _tst /$'[^\0]#\0'/ \( \
/$'aaa\0'/ :'compadd aaa' \
/$'bbb\0'/ :'compadd bbb' \) \#
</pre></div>
<p>In this example, an indefinite number of command arguments may be
completed. Odd arguments are completed as <tt>aaa</tt> and even arguments
as <tt>bbb</tt>. Completion fails unless the set of <tt>aaa</tt> and <tt>bbb</tt>
arguments before the current one is matched correctly.
</p>
<div class="example">
<pre class="example">_regex_arguments _tst /$'[^\0]#\0'/ \
\( /$'aaa\0'/ :'compadd aaa' \| \
/$'bbb\0'/ :'compadd bbb' \) \#
</pre></div>
<p>This is similar, but either <tt>aaa</tt> or <tt>bbb</tt> may be completed for
any argument. In this case <tt>_regex_words</tt> could be used to generate
a suitable expression for the arguments.
</p>
<a name="index-_005fregex_005fwords-_005b-_002dt-term-_005d"></a>
</dd>
<dt><tt>_regex_words</tt> <var>tag</var> <var>description</var> <var>spec</var> ...</dt>
<dd><p>This function can be used to generate arguments for the
<tt>_regex_arguments</tt> command which may be inserted at any point where
a set of rules is expected. The <var>tag</var> and <var>description</var> give a
standard tag and description pertaining to the current context. Each
<var>spec</var> contains two or three arguments separated by a colon: note
that there is no leading colon in this case.
</p>
<p>Each <var>spec</var> gives one of a set of words that may be completed at
this point, together with arguments. It is thus roughly equivalent to
the <tt>_arguments</tt> function when used in normal (non-regex) completion.
</p>
<p>The part of the <var>spec</var> before the first colon is the word to be
completed. This may contain a <tt>*</tt>; the entire word, before and after
the <tt>*</tt> is completed, but only the text before the <tt>*</tt> is required
for the context to be matched, so that further arguments may be
completed after the abbreviated form.
</p>
<p>The second part of <var>spec</var> is a description for the word being
completed.
</p>
<p>The optional third part of the <var>spec</var> describes how words following
the one being completed are themselves to be completed. It will be
evaluated in order to avoid problems with quoting. This means that
typically it contains a reference to an array containing previously
generated regex arguments.
</p>
<p>The option <tt>-t</tt> <var>term</var> specifies a terminator for the word
instead of the usual space. This is handled as an auto-removable suffix
in the manner of the option <tt>-s</tt> <var>sep</var> to <tt>_values</tt>.
</p>
<p>The result of the processing by <tt>_regex_words</tt> is placed in the array
<tt>reply</tt>, which should be made local to the calling function.
If the set of words and arguments may be matched repeatedly, a <tt>#</tt>
should be appended to the generated array at that point.
</p>
<p>For example:
</p>
<div class="example">
<pre class="example">local -a reply
_regex_words mydb-commands 'mydb commands' \
'add:add an entry to mydb:$mydb_add_cmds' \
'show:show entries in mydb'
_regex_arguments _mydb "$reply[@]"
_mydb "$@"
</pre></div>
<p>This shows a completion function for a command <tt>mydb</tt> which takes
two command arguments, <tt>add</tt> and <tt>show</tt>. <tt>show</tt> takes no arguments,
while the arguments for <tt>add</tt> have already been prepared in an
array <tt>mydb_add_cmds</tt>, quite possibly by a previous call to
<tt>_regex_words</tt>.
</p>
<a name="index-_005frequested"></a>
</dd>
<dt><tt>_requested</tt> [ <tt>-x</tt> ] [ <tt>-12VJ</tt> ] <var>tag</var> [ <var>name</var> <var>descr</var> [ <var>command</var> [ <var>arg</var> ... ] ]</dt>
<dd><p>This function is called to decide whether a tag already registered by a
call to <tt>_tags</tt> (see below) has been requested by the user and hence
completion should be performed for it. It returns status zero if the
tag is requested and non-zero otherwise. The function is typically used
as part of a loop over different tags as follows:
</p>
<div class="example">
<pre class="example">_tags foo bar baz
while _tags; do
if _requested foo; then
... # perform completion for foo
fi
... # test the tags bar and baz in the same way
... # exit loop if matches were generated
done
</pre></div>
<p>Note that the test for whether matches were generated is not performed
until the end of the <tt>_tags</tt> loop. This is so that the user can set
the <tt>tag-order</tt> style to specify a set of tags to be completed at the
same time.
</p>
<p>If <var>name</var> and <var>descr</var> are given, <tt>_requested</tt> calls the
<tt>_description</tt> function with these arguments together with the options
passed to <tt>_requested</tt>.
</p>
<p>If <var>command</var> is given, the <tt>_all_labels</tt> function will be called
immediately with the same arguments. In simple cases this makes it
possible to perform the test for the tag and the matching in one go.
For example:
</p>
<div class="example">
<pre class="example">local expl ret=1
_tags foo bar baz
while _tags; do
_requested foo expl 'description' \
compadd foobar foobaz && ret=0
...
(( ret )) || break
done
</pre></div>
<p>If the <var>command</var> is not <tt>compadd</tt>, it must nevertheless be prepared
to handle the same options.
</p>
<a name="index-_005fretrieve_005fcache"></a>
</dd>
<dt><tt>_retrieve_cache</tt> <var>cache_identifier</var></dt>
<dd><p>This function retrieves completion information from the file given by
<var>cache_identifier</var>, stored in a directory specified by the
<tt>cache-path</tt> style which defaults to <tt>~/.zcompcache</tt>. The return status
is zero if retrieval was successful. It will only attempt retrieval
if the <tt>use-cache</tt> style is set, so you can call this function
without worrying about whether the user wanted to use the caching
layer.
</p>
<p>See <tt>_store_cache</tt> below for more details.
</p>
<a name="index-_005fsep_005fparts"></a>
</dd>
<dt><tt>_sep_parts</tt></dt>
<dd><p>This function is passed alternating arrays and separators as arguments.
The arrays specify completions for parts of strings to be separated by the
separators. The arrays may be the names of array parameters or
a quoted list of words in parentheses. For example, with the array
‘<tt>hosts=(ftp news)</tt>’ the call ‘<tt>_sep_parts '(foo bar)' @ hosts</tt>’ will
complete the string ‘<tt>f</tt>’ to ‘<tt>foo</tt>’ and the string ‘<tt>b@n</tt>’ to
‘<tt>bar@news</tt>’.
</p>
<p>This function accepts the <tt>compadd</tt> options ‘<tt>-V</tt>’, ‘<tt>-J</tt>’,
‘<tt>-1</tt>’, ‘<tt>-2</tt>’, ‘<tt>-n</tt>’, ‘<tt>-X</tt>’, ‘<tt>-M</tt>’, ‘<tt>-P</tt>’, ‘<tt>-S</tt>’,
‘<tt>-r</tt>’, ‘<tt>-R</tt>’, and ‘<tt>-q</tt>’ and passes them on to the <tt>compadd</tt>
builtin used to add the matches.
</p>
<a name="index-_005fsequence"></a>
</dd>
<dt><tt>_sequence</tt> [ <tt>-s</tt> <var>sep</var> ] [ <tt>-n</tt> <var>max</var> ] [ <tt>-d</tt> ] <var>function</var> [ <tt>-</tt> ] ...</dt>
<dd><p>This function is a wrapper to other functions for completing items in a
separated list. The same function is used to complete each item in the
list. The separator is specified with the <tt>-s</tt> option. If <tt>-s</tt> is
omitted it will use ‘<tt>,</tt>’. Duplicate values are not matched unless
<tt>-d</tt> is specified. If there is a fixed or maximum number of items in
the list, this can be specified with the <tt>-n</tt> option.
</p>
<p>Common <tt>compadd</tt> options are passed on to the function. It is possible
to use <tt>compadd</tt> directly with <tt>_sequence</tt>, though <tt>_values</tt> may
be more appropriate in this situation.
</p>
<a name="index-_005fsetup"></a>
</dd>
<dt><tt>_setup</tt> <var>tag</var> [ <var>group</var> ]</dt>
<dd><p>This function sets up the special
parameters used by the completion system appropriately for the <var>tag</var>
given as the first argument. It uses the styles <tt>list-colors</tt>,
<tt>list-packed</tt>, <tt>list-rows-first</tt>, <tt>last-prompt</tt>, <tt>accept-exact</tt>,
<tt>menu</tt> and <tt>force-list</tt>.
</p>
<p>The optional <var>group</var> supplies the name of the group in which the
matches will be placed. If it is not given, the <var>tag</var> is used as
the group name.
</p>
<p>This function is called automatically from <tt>_description</tt>
and hence is not normally called explicitly.
</p>
<a name="index-_005fstore_005fcache"></a>
</dd>
<dt><tt>_store_cache</tt> <var>cache_identifier</var> <var>param</var> ...</dt>
<dd><p>This function, together with <tt>_retrieve_cache</tt> and
<tt>_cache_invalid</tt>, implements a caching layer which can be used
in any completion function. Data obtained by
costly operations are stored in parameters;
this function then dumps the values of those parameters to a file. The
data can then be retrieved quickly from that file via <tt>_retrieve_cache</tt>,
even in different instances of the shell.
</p>
<p>The <var>cache_identifier</var> specifies the file which the data should be
dumped to. The file is stored in a directory specified by the
<tt>cache-path</tt> style which defaults to <tt>~/.zcompcache</tt>. The remaining
<var>param</var>s arguments are the parameters to dump to the file.
</p>
<p>The return status is zero if storage was successful. The function will
only attempt storage if the <tt>use-cache</tt> style is set, so you can
call this function without worrying about whether the user wanted to
use the caching layer.
</p>
<p>The completion function may avoid calling <tt>_retrieve_cache</tt> when it
already has the completion data available as parameters.
However, in that case it should
call <tt>_cache_invalid</tt> to check whether the data in the parameters and
in the cache are still valid.
</p>
<p>See the _perl_modules completion function for a simple example of
the usage of the caching layer.
</p>
<a name="index-_005ftags"></a>
</dd>
<dt><tt>_tags</tt> [ [ <tt>-C</tt> <var>name</var> ] <var>tag</var> ... ]</dt>
<dd><p>If called with arguments, these are taken to be the names of tags
valid for completions in the current context. These tags are stored
internally and sorted by using the <tt>tag-order</tt> style.
</p>
<p>Next, <tt>_tags</tt> is called repeatedly without arguments from the same
completion function. This successively selects the first, second,
etc. set of tags requested by the user. The return status is zero if at
least one of the tags is requested and non-zero otherwise. To test if a
particular tag is to be tried, the <tt>_requested</tt> function should be
called (see above).
</p>
<p>If ‘<tt>-C</tt> <var>name</var>’ is given, <var>name</var> is temporarily stored in the
argument field (the fifth) of the context in the <tt>curcontext</tt> parameter
during the call to <tt>_tags</tt>; the field is restored on exit. This
allows <tt>_tags</tt> to use a more
specific context without having to change and reset the
<tt>curcontext</tt> parameter (which has the same effect).
</p>
<a name="index-_005fvalues"></a>
</dd>
<dt><tt>_values</tt> [ <tt>-O</tt> <var>name</var> ] [ <tt>-s</tt> <var>sep</var> ] [ <tt>-S</tt> <var>sep</var> ] [ <tt>-wC</tt> ] <var>desc</var> <var>spec</var> ...</dt>
<dd><p>This is used to complete arbitrary keywords (values) and their arguments,
or lists of such combinations.
</p>
<p>If the first argument is the option ‘<tt>-O</tt> <var>name</var>’, it will be used
in the same way as by the <tt>_arguments</tt> function. In other words, the
elements of the <var>name</var> array will be passed to <tt>compadd</tt>
when executing an action.
</p>
<p>If the first argument (or the first argument after ‘<tt>-O</tt> <var>name</var>’)
is ‘<tt>-s</tt>’, the next argument is used as the character that separates
multiple values. This character is automatically added after each value
in an auto-removable fashion (see below); all values completed by
‘<tt>_values -s</tt>’ appear in the same word on the command line, unlike
completion using <tt>_arguments</tt>. If this option is not present, only a
single value will be completed per word.
</p>
<p>Normally, <tt>_values</tt> will only use the current word to determine
which values are already present on the command line and hence are not
to be completed again. If the <tt>-w</tt> option is given, other arguments
are examined as well.
</p>
<p>The first non-option argument is used as a string to print as a
description before listing the values.
</p>
<p>All other arguments describe the possible values and their
arguments in the same format used for the description of options by
the <tt>_arguments</tt> function (see above). The only differences are that
no minus or plus sign is required at the beginning,
values can have only one argument, and the forms of action
beginning with an equal sign are not supported.
</p>
<p>The character separating a value from its argument can be set using the
option <tt>-S</tt> (like <tt>-s</tt>, followed by the character to use as the
separator in the next argument). By default the equals
sign will be used as the separator between values and arguments.
</p>
<p>Example:
</p>
<div class="example">
<pre class="example">_values -s , 'description' \
'*foo[bar]' \
'(two)*one[number]:first count:' \
'two[another number]::second count:(1 2 3)'
</pre></div>
<p>This describes three possible values: ‘<tt>foo</tt>’, ‘<tt>one</tt>’, and
‘<tt>two</tt>’. The first is described as ‘<tt>bar</tt>’, takes no argument
and may appear more than once. The second is described as
‘<tt>number</tt>’, may appear more than once, and takes one mandatory
argument described as ‘<tt>first count</tt>’; no action is
specified, so it will not be completed. The
‘<tt>(two)</tt>’ at the beginning says that if the value ‘<tt>one</tt>’ is on
the line, the value ‘<tt>two</tt>’ will no longer be considered a possible
completion. Finally, the last value (‘<tt>two</tt>’) is described
as ‘<tt>another number</tt>’ and takes an optional argument described as
‘<tt>second count</tt>’ for which the completions (to appear after an
‘<tt>=</tt>’) are ‘<tt>1</tt>’, ‘<tt>2</tt>’, and ‘<tt>3</tt>’. The <tt>_values</tt> function
will complete lists of these values separated by commas.
</p>
<p>Like <tt>_arguments</tt>, this function temporarily adds another context name
component to the arguments element (the fifth) of the current context
while executing the <var>action</var>. Here this name is just the name of the
value for which the argument is completed.
</p>
<p>The style <tt>verbose</tt> is used to decide if the descriptions for the
values (but not those for the arguments) should be printed.
</p>
<p>The associative array <tt>val_args</tt> is used to report values and their
arguments; this works similarly to the <tt>opt_args</tt> associative array
used by <tt>_arguments</tt>. Hence the function calling <tt>_values</tt> should
declare the local parameters <tt>state</tt>, <tt>state_descr</tt>, <tt>line</tt>,
<tt>context</tt> and <tt>val_args</tt>:
</p>
<div class="example">
<pre class="example">local context state state_descr line
typeset -A val_args
</pre></div>
<p>when using an action of the form ‘<tt>-></tt><var>string</var>’. With this
function the <tt>context</tt> parameter will be set to the name of the
value whose argument is to be completed. Note that for <tt>_values</tt>,
the <tt>state</tt> and <tt>state_descr</tt> are scalars rather than arrays.
Only a single matching state is returned.
</p>
<p>Note also that <tt>_values</tt> normally adds the character used as the
separator between values as an auto-removable suffix (similar to a
‘<tt>/</tt>’ after a directory). However, this is not possible for a
‘<tt>-></tt><var>string</var>’ action as the matches for the argument are
generated by the calling function. To get the usual behaviour,
the calling function can add the separator <var>x</var> as a suffix by
passing the options ‘<tt>-qS</tt> <var>x</var>’ either directly or indirectly to
<tt>compadd</tt>.
</p>
<p>The option <tt>-C</tt> is treated in the same way as it is by <tt>_arguments</tt>.
In that case the parameter <tt>curcontext</tt> should be made local instead
of <tt>context</tt> (as described above).
</p>
<a name="index-_005fwanted"></a>
</dd>
<dt><tt>_wanted</tt> [ <tt>-x</tt> ] [ <tt>-C</tt> <var>name</var> ] [ <tt>-12VJ</tt> ] <var>tag</var> <var>name</var> <var>descr</var> <var>command</var> [ <var>arg</var> ...]</dt>
<dd><p>In many contexts, completion can only generate one particular set of
matches, usually corresponding to a single tag. However, it is
still necessary to decide whether the user requires matches of this type.
This function is useful in such a case.
</p>
<p>The arguments to <tt>_wanted</tt> are the same as those to <tt>_requested</tt>,
i.e. arguments to be passed to <tt>_description</tt>. However, in this case
the <var>command</var> is not optional; all the processing of tags, including
the loop over both tags and tag labels and the generation of matches,
is carried out automatically by <tt>_wanted</tt>.
</p>
<p>Hence to offer only one tag and immediately add the corresponding
matches with the given description:
</p>
<div class="example">
<pre class="example">local expl
_wanted tag expl 'description' \
compadd matches...
</pre></div>
<p>Note that, as for <tt>_requested</tt>, the <var>command</var> must be able to
accept options to be passed down to <tt>compadd</tt>.
</p>
<p>Like <tt>_tags</tt> this function supports the <tt>-C</tt> option to give a
different name for the argument context field. The <tt>-x</tt> option has
the same meaning as for <tt>_description</tt>.
</p>
</dd>
</dl>
<hr>
<a name="Completion-Directories"></a>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-Functions" title="Previous section in reading order"> < </a>]</td>
<td valign="middle" align="left">[<a href="#Completion-System" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next section in reading order"> > </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<a name="Completion-Directories-1"></a>
<h2 class="section">20.7 Completion Directories</h2>
<a name="index-completion-system_002c-directory-structure"></a>
<p>In the source distribution, the files are contained in various
subdirectories of the <tt>Completion</tt> directory. They may have been
installed in the same structure, or into one single function directory.
The following is a description of the files found in the original directory
structure. If you wish to alter an installed file, you will need to copy
it to some directory which appears earlier in your <tt>fpath</tt> than the
standard directory where it appears.
</p>
<dl compact="compact">
<dt><tt>Base</tt></dt>
<dd><p>The core functions and special completion widgets automatically bound
to keys. You will certainly need most of these, though will
probably not need to alter them. Many of these are documented above.
</p>
</dd>
<dt><tt>Zsh</tt></dt>
<dd><p>Functions for completing arguments of shell builtin commands and
utility functions for this. Some of these are also used by functions from
the <tt>Unix</tt> directory.
</p>
</dd>
<dt><tt>Unix</tt></dt>
<dd><p>Functions for completing arguments of external commands and suites of
commands. They may need modifying for your system, although in many cases
some attempt is made to decide which version of a command is present. For
example, completion for the <tt>mount</tt> command tries to determine the system
it is running on, while completion for many other utilities try to decide
whether the GNU version of the command is in use, and hence whether the
<tt>-</tt><tt>-help</tt> option is supported.
</p>
</dd>
<dt><tt>X</tt>, <tt>AIX</tt>, <tt>BSD</tt>, ...</dt>
<dd><p>Completion and utility function for commands available only on some systems.
These are not arranged hierarchically, so, for example, both the
<tt>Linux</tt> and <tt>Debian</tt> directories, as well as the <tt>X</tt> directory,
may be useful on your system.
</p>
</dd>
</dl>
<hr>
<table class="header" cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="#Completion-System" title="Beginning of this chapter or previous chapter"> << </a>]</td>
<td valign="middle" align="left">[<a href="Completion-Using-compctl.html#Completion-Using-compctl" title="Next chapter"> >> </a>]</td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left"> </td>
<td valign="middle" align="left">[<a href="index.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="zsh_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Concept-Index.html#Concept-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="zsh_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<p><font size="-1">
This document was generated on <em>February 7, 2016</em> using <a href="http://www.gnu.org/software/texinfo/"><em>texi2any</em></a>.
</font></p>
<font size="-1">Zsh version 5.1.1, released on September 11, 2015.</font>
</body>
</html>
|