This file is indexed.

/usr/bin/xdg-settings is in xdg-utils 1.1.0~rc1-2ubuntu7.

This file is owned by root:root, with mode 0o755.

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
#!/bin/sh
#---------------------------------------------
#   xdg-settings
#
#   Utility script to get various settings from the desktop environment.
#
#   Refer to the usage() function below for usage.
#
#   Copyright 2009, Google Inc.
#
#   LICENSE:
#
#   Permission is hereby granted, free of charge, to any person obtaining a
#   copy of this software and associated documentation files (the "Software"),
#   to deal in the Software without restriction, including without limitation
#   the rights to use, copy, modify, merge, publish, distribute, sublicense,
#   and/or sell copies of the Software, and to permit persons to whom the
#   Software is furnished to do so, subject to the following conditions:
#
#   The above copyright notice and this permission notice shall be included
#   in all copies or substantial portions of the Software.
#
#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
#   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
#   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
#   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
#   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
#   OTHER DEALINGS IN THE SOFTWARE.
#
#---------------------------------------------

manualpage()
{
cat << _MANUALPAGE
Name

xdg-settings - get various settings from the desktop environment

Synopsis

xdg-settings { get | check | set } {property} [value]

xdg-settings { --help | --list | --manual | --version }

Description

xdg-settings gets various settings from the desktop environment. For instance,
desktop environments often provide proxy configuration and default web browser
settings. Using xdg-settings these parameters can be extracted for use by
applications that do not use the desktop environment's libraries (which would
use the settings natively).

xdg-settings is for use inside a desktop session only. It is not recommended to
use xdg-settings as root.

Options

--help
    Show command synopsis.
--list
    List all properties xdg-settings knows about.
--manual
    Show this manualpage.
--version
    Show the xdg-utils version information.

Exit Codes

An exit code of 0 indicates success while a non-zero exit code indicates
failure. The following failure codes can be returned:

1
    Error in command line syntax.
2
    One of the files passed on the command line did not exist.
3
    A required tool could not be found.
4
    The action failed.

Examples

Get the desktop file name of the current default web browser

        xdg-settings get default-web-browser


Check whether the default web browser is firefox.desktop, which can be false
even if "get default-web-browser" says that is the current value (if only some
of the underlying settings actually reflect that value)

        xdg-settings check default-web-browser firefox.desktop


Set the default web browser to google-chrome.desktop

        xdg-settings set default-web-browser google-chrome.desktop


_MANUALPAGE
}

usage()
{
cat << _USAGE
xdg-settings - get various settings from the desktop environment

Synopsis

xdg-settings { get | check | set } {property} [value]

xdg-settings { --help | --list | --manual | --version }

_USAGE
}

#@xdg-utils-common@

#----------------------------------------------------------------------------
#   Common utility functions included in all XDG wrapper scripts
#----------------------------------------------------------------------------

DEBUG()
{
  [ -z "${XDG_UTILS_DEBUG_LEVEL}" ] && return 0;
  [ ${XDG_UTILS_DEBUG_LEVEL} -lt $1 ] && return 0;
  shift
  echo "$@" >&2
}

#-------------------------------------------------------------
# Exit script on successfully completing the desired operation

exit_success()
{
    if [ $# -gt 0 ]; then
        echo "$@"
        echo
    fi

    exit 0
}


#-----------------------------------------
# Exit script on malformed arguments, not enough arguments
# or missing required option.
# prints usage information

exit_failure_syntax()
{
    if [ $# -gt 0 ]; then
        echo "xdg-settings: $@" >&2
        echo "Try 'xdg-settings --help' for more information." >&2
    else
        usage
        echo "Use 'man xdg-settings' or 'xdg-settings --manual' for additional info."
    fi

    exit 1
}

#-------------------------------------------------------------
# Exit script on missing file specified on command line

exit_failure_file_missing()
{
    if [ $# -gt 0 ]; then
        echo "xdg-settings: $@" >&2
    fi

    exit 2
}

#-------------------------------------------------------------
# Exit script on failure to locate necessary tool applications

exit_failure_operation_impossible()
{
    if [ $# -gt 0 ]; then
        echo "xdg-settings: $@" >&2
    fi

    exit 3
}

#-------------------------------------------------------------
# Exit script on failure returned by a tool application

exit_failure_operation_failed()
{
    if [ $# -gt 0 ]; then
        echo "xdg-settings: $@" >&2
    fi

    exit 4
}

#------------------------------------------------------------
# Exit script on insufficient permission to read a specified file

exit_failure_file_permission_read()
{
    if [ $# -gt 0 ]; then
        echo "xdg-settings: $@" >&2
    fi

    exit 5
}

#------------------------------------------------------------
# Exit script on insufficient permission to write a specified file

exit_failure_file_permission_write()
{
    if [ $# -gt 0 ]; then
        echo "xdg-settings: $@" >&2
    fi

    exit 6
}

check_input_file()
{
    if [ ! -e "$1" ]; then
        exit_failure_file_missing "file '$1' does not exist"
    fi
    if [ ! -r "$1" ]; then
        exit_failure_file_permission_read "no permission to read file '$1'"
    fi
}

check_vendor_prefix()
{
    file_label="$2"
    [ -n "$file_label" ] || file_label="filename"
    file=`basename "$1"`
    case "$file" in
       [a-zA-Z]*-*)
         return
         ;;
    esac

    echo "xdg-settings: $file_label '$file' does not have a proper vendor prefix" >&2
    echo 'A vendor prefix consists of alpha characters ([a-zA-Z]) and is terminated' >&2
    echo 'with a dash ("-"). An example '"$file_label"' is '"'example-$file'" >&2
    echo "Use --novendor to override or 'xdg-settings --manual' for additional info." >&2
    exit 1
}

check_output_file()
{
    # if the file exists, check if it is writeable
    # if it does not exists, check if we are allowed to write on the directory
    if [ -e "$1" ]; then
        if [ ! -w "$1" ]; then
            exit_failure_file_permission_write "no permission to write to file '$1'"
        fi
    else
        DIR=`dirname "$1"`
        if [ ! -w "$DIR" -o ! -x "$DIR" ]; then
            exit_failure_file_permission_write "no permission to create file '$1'"
        fi
    fi
}

#----------------------------------------
# Checks for shared commands, e.g. --help

check_common_commands()
{
    while [ $# -gt 0 ] ; do
        parm="$1"
        shift

        case "$parm" in
            --help)
            usage
            echo "Use 'man xdg-settings' or 'xdg-settings --manual' for additional info."
            exit_success
            ;;

            --manual)
            manualpage
            exit_success
            ;;

            --version)
            echo "xdg-settings 1.0.2"
            exit_success
            ;;
        esac
    done
}

check_common_commands "$@"

[ -z "${XDG_UTILS_DEBUG_LEVEL}" ] && unset XDG_UTILS_DEBUG_LEVEL;
if [ ${XDG_UTILS_DEBUG_LEVEL-0} -lt 1 ]; then
    # Be silent
    xdg_redirect_output=" > /dev/null 2> /dev/null"
else
    # All output to stderr
    xdg_redirect_output=" >&2"
fi

#--------------------------------------
# Checks for known desktop environments
# set variable DE to the desktop environments name, lowercase

detectDE()
{
    if [ x"$KDE_FULL_SESSION" = x"true" ]; then DE=kde;
    elif [ x"$GNOME_DESKTOP_SESSION_ID" != x"" ]; then DE=gnome;
    elif `dbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.gnome.SessionManager > /dev/null 2>&1` ; then DE=gnome;
    elif xprop -root _DT_SAVE_MODE 2> /dev/null | grep ' = \"xfce4\"$' >/dev/null 2>&1; then DE=xfce;
    elif [ x"$DESKTOP_SESSION" = x"LXDE" ]; then DE=lxde;
    else DE=""
    fi
}

#----------------------------------------------------------------------------
# kfmclient exec/openURL can give bogus exit value in KDE <= 3.5.4
# It also always returns 1 in KDE 3.4 and earlier
# Simply return 0 in such case

kfmclient_fix_exit_code()
{
    version=`kde${KDE_SESSION_VERSION}-config --version 2>/dev/null | grep '^KDE'`
    major=`echo $version | sed 's/KDE.*: \([0-9]\).*/\1/'`
    minor=`echo $version | sed 's/KDE.*: [0-9]*\.\([0-9]\).*/\1/'`
    release=`echo $version | sed 's/KDE.*: [0-9]*\.[0-9]*\.\([0-9]\).*/\1/'`
    test "$major" -gt 3 && return $1
    test "$minor" -gt 5 && return $1
    test "$release" -gt 4 && return $1
    return 0
}

check_desktop_filename()
{
    case "$1" in
      */*)
        exit_failure_syntax "invalid application name"
        ;;
      *.desktop)
        return
        ;;
      *)
        exit_failure_syntax "invalid application name"
        ;;
    esac
}

# {{{ default browser
# {{{ utility functions

# This handles backslashes but not quote marks.
first_word()
{
    read first rest
    echo "$first"
}

binary_to_desktop_file()
{
    search="${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
    binary="`which "$1"`"
    binary="`readlink -f "$binary"`"
    base="`basename "$binary"`"
    IFS=:
    for dir in $search; do
        unset IFS
        [ "$dir" ] || continue
        [ -d "$dir/applications" -o -d "$dir/applnk" ] || continue
        for file in "$dir"/applications/*.desktop "$dir"/applnk/*.desktop; do
            [ -r "$file" ] || continue
            # Check to make sure it's worth the processing.
            grep -q "^Exec.*$base" "$file" || continue
            # Make sure it's a visible desktop file (e.g. not "preferred-web-browser.desktop").
            grep -Eq "^(NoDisplay|Hidden)=true" "$file" && continue
            command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | first_word`"
            command="`which "$command"`"
            if [ x"`readlink -f "$command"`" = x"$binary" ]; then
                # Fix any double slashes that got added path composition
                echo "$file" | sed -e 's,//*,/,g'
                return
            fi
        done
    done
}

desktop_file_to_binary()
{
    search="${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
    desktop="`basename "$1"`"
    IFS=:
    for dir in $search; do
        unset IFS
        [ "$dir" -a -d "$dir/applications" ] || continue
        file="$dir/applications/$desktop"
        [ -r "$file" ] || continue
        # Remove any arguments (%F, %f, %U, %u, etc.).
        command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | first_word`"
        command="`which "$command"`"
        readlink -f "$command"
        return
    done
}

# In order to remove an application from the automatically-generated list of
# applications for handling a given MIME type, the desktop environment may copy
# the global .desktop file into the user's .local directory, and remove that
# MIME type from its list. In that case, we must restore the MIME type to the
# application's list of MIME types before we can set it as the default for that
# MIME type. (We can't just delete the local version, since the user may have
# made other changes to it as well. So, tweak the existing file.)
# This function is hard-coded for text/html but it could be adapted if needed.
fix_local_desktop_file()
{
    if test -z "$2" ; then
        MIME="text/html"
    else
        MIME="$2"
    fi
    apps="${XDG_DATA_HOME:-$HOME/.local/share}/applications"
    # No local desktop file?
    [ ! -f "$apps/$1" ] && return
    MIMETYPES="`grep "^MimeType=" "$apps/$1" | cut -d= -f 2-`"
    case "$MIMETYPES" in
        $MIME\;*|*\;$MIME\;*|*\;$MIME\;|*\;$MIME)
        # Already has the mime-type? Great!
        return 0
        ;;
    esac

    # Add the mime-type to the list
    temp="`mktemp "$apps/$1.XXXXXX"`" || return
    grep -v "^MimeType=" "$apps/$1" >> "$temp"
    echo "MimeType=$MIME;$MIMETYPES" >> "$temp"

    oldlines="`wc -l < "$apps/$1"`"
    newlines="`wc -l < "$temp"`"
    # The new file should have at least as many lines as the old.
    if [ $oldlines -le $newlines ]; then
        mv "$temp" "$apps/$1"
        # This can take a little bit to get noticed.
        sleep 4
    else
        rm -f "$temp"
        return 1
    fi
}

# }}} utility functions
# {{{ MIME utilities

xdg_mime_fixup()
{
    # xdg-mime may use ktradertest, which will fork off a copy of kdeinit if
    # one does not already exist. It will exit after about 15 seconds if no
    # further processes need it around. But since it does not close its stdout,
    # the shell (via grep) will wait around for kdeinit to exit. If we start a
    # copy here, that copy will be used in xdg-mime and we will avoid waiting.
    if [ "$DE" = kde -a -z "$XDG_MIME_FIXED" ]; then
        ktradertest text/html Application > /dev/null 2>&1
        # Only do this once, as we only need it once.
        XDG_MIME_FIXED=yes
    fi
}

get_browser_mime()
{
    if test -z "$1" ; then
        MIME="text/html"
    else
        MIME="$1"
    fi
    xdg_mime_fixup
    xdg-mime query default "$MIME"
}

set_browser_mime()
{
    xdg_mime_fixup
    if test -z "$2" ; then
        MIME="text/html"
    else
        MIME="$2"
    fi
    orig="`get_browser_mime $MIME`"
    # Fixing the local desktop file can actually change the default browser all
    # by itself, so we fix it only after querying to find the current default.
    fix_local_desktop_file "$1" "$MIME" || return
    mkdir -p "${XDG_DATA_HOME:-$HOME/.local/share}/applications"
    xdg-mime default "$1" "$MIME" || return
    if [ x"`get_browser_mime $MIME`" != x"$1" ]; then
        # Put back the original value
        xdg-mime default "$orig" "$MIME"
        exit_failure_operation_failed
    fi
}

# }}} MIME utilities
# {{{ KDE

# Resolves the KDE browser setting to a binary: if prefixed with !, simply removes it;
# otherwise, uses desktop_file_to_binary to get the binary out of the desktop file.
resolve_kde_browser()
{
    [ -z "$browser" ] && return
    case "$browser" in
      !*)
        echo "${browser#!}"
        ;;
      *)
        desktop_file_to_binary "$browser"
        ;;
    esac
}

# Does the opposite of resolve_kde_browser: if prefixed with !, tries to find a desktop
# file corresponding to the binary, otherwise just returns the desktop file name.
resolve_kde_browser_desktop()
{
    [ -z "$browser" ] && return
    case "$browser" in
      !*)
        desktop="`binary_to_desktop_file "${browser#!}"`"
        basename "$desktop"
        ;;
      *)
        echo "$browser"
        ;;
    esac
}

# Reads the KDE browser setting, compensating for a bug in some versions of kreadconfig.
read_kde_browser()
{
    browser="`kreadconfig --file kdeglobals --group General --key BrowserApplication`"
    if [ x"$browser" != x ]; then
        echo "$browser"
    else
        # kreadconfig in KDE 4 may not notice Key[$*]=... localized settings, so
        # check by hand if it didn't find anything (oddly kwriteconfig works
        # fine though).
        kdeglobals_dir=`kde${KDE_SESSION_VERSION}-config --path config  | cut -d ':' -f 1`
        kdeglobals="$kdeglobals_dir/kdeglobals"
        [ ! -f "$kdeglobals" ] && return
        # This will only take the first value if there is more than one.
        grep '^BrowserApplication\[$[^]=]*\]=' "$kdeglobals" | head -n 1 | cut -d= -f 2-
    fi
}

get_browser_kde()
{
    browser="`read_kde_browser`"
    if [ x"$browser" = x ]; then
        # No explicit default browser; KDE will use the MIME type text/html.
        get_browser_mime
    else
        resolve_kde_browser_desktop
    fi
}

check_browser_kde()
{
    check="`desktop_file_to_binary "$1"`"
    if [ -z "$check" ]; then
        echo no
        exit_success
    fi
    browser="`read_kde_browser`"
    binary="`resolve_kde_browser`"
    # Because KDE will use the handler for MIME type text/html if this value
    # is empty, we allow either the empty string or a match to $check here.
    if [ x"$binary" != x -a x"$binary" != x"$check" ]; then
        echo no
        exit_success
    fi
    browser="`get_browser_mime`"
    binary="`desktop_file_to_binary "$browser"`"
    if [ x"$binary" != x"$check" ]; then
        echo no
        exit_success
    fi
    echo yes
    exit_success
}

set_browser_kde()
{
    set_browser_mime "$1" || return
    kwriteconfig --file kdeglobals --group General --key BrowserApplication "$1"
}

# }}} KDE
# {{{ GNOME

get_browser_gnome()
{
    get_browser_mime "x-scheme-handler/http"
}

check_browser_gnome()
{
    desktop="$1"
    check="`desktop_file_to_binary "$1"`"
    if [ -z "$check" ]; then
        echo no
        exit_success
    fi
    # Check HTTP and HTTPS, but not about: and unknown:, using the GNOME 3 scheme.
    for protocol in http https; do
        browser="`get_browser_mime "x-scheme-handler/$protocol"`"
        if [ x"$browser" != x"$desktop" ]; then
            echo no
            exit_success
        fi
    done

    binary="`gconftool-2 --get /desktop/gnome/applications/browser/exec | first_word`"
    if [ x"$binary" != x"$check" ]; then
        echo no
        exit_success
    fi
    # Check HTTP and HTTPS, but not about: and unknown:, using the legacy GNOME scheme.
    for protocol in http https; do
        binary="`gconftool-2 --get /desktop/gnome/url-handlers/$protocol/command | first_word`"
        if [ x"$binary" != x"$check" ]; then
            echo no
            exit_success
        fi
    done
    browser="`get_browser_mime`"
    binary="`desktop_file_to_binary "$browser"`"
    if [ x"$binary" != x"$check" ]; then
        echo no
        exit_success
    fi
    echo yes
    exit_success
}

set_browser_gnome()
{
    binary="`desktop_file_to_binary "$1"`"
    [ "$binary" ] || exit_failure_file_missing
    set_browser_mime "$1" || return

    # Set the default browser using the GNOME 3 scheme.
    for protocol in http https about unknown; do
        set_browser_mime "$1" "x-scheme-handler/$protocol" || return
    done

    # Set the default browser using the legacy GNOME scheme.
    gconftool-2 --type string --set /desktop/gnome/applications/browser/exec "$binary"
    gconftool-2 --type bool --set /desktop/gnome/applications/browser/needs_term false
    gconftool-2 --type bool --set /desktop/gnome/applications/browser/nremote true
    # Set the handler for HTTP and HTTPS.
    for protocol in http https; do
        gconftool-2 --type string --set /desktop/gnome/url-handlers/$protocol/command "$binary %s"
        gconftool-2 --type bool --set /desktop/gnome/url-handlers/$protocol/needs_terminal false
        gconftool-2 --type bool --set /desktop/gnome/url-handlers/$protocol/enabled true
    done
    # Set the handler for about: and unknown URL types.
    for protocol in about unknown; do
        gconftool-2 --type string --set /desktop/gnome/url-handlers/$protocol/command "$binary %s"
    done
}

# }}} GNOME
# {{{ xfce

get_browser_xfce()
{
    search="${XDG_CONFIG_HOME:-$HOME/.config}:${XDG_CONFIG_DIRS:-/etc/xdg}"
    IFS=:
    for dir in $search; do
        unset IFS
        [ "$dir" -a -d "$dir/xfce4" ] || continue
        file="$dir/xfce4/helpers.rc"
        [ -r "$file" ] || continue
        grep -q "^WebBrowser=" "$file" || continue
        desktop="`grep "^WebBrowser=" "$file" | cut -d= -f 2-`"
        echo "$desktop.desktop"
        return
    done
    exit_failure_operation_failed
}

check_browser_xfce()
{
    browser="`get_browser_xfce`"
    if [ x"$browser" != x"$1" ]; then
        echo no
        exit_success
    fi
    echo yes
    exit_success
}

check_xfce_desktop_file()
{
    # Annoyingly, xfce wants its .desktop files in a separate directory instead
    # of the standard locations, and requires a few custom tweaks to them:
    # "Type" must be "X-XFCE-Helper"
    # "X-XFCE-Category" must be "WebBrowser" (for web browsers, anyway)
    # "X-XFCE-Commands" and "X-XFCE-CommandsWithParameter" must be set
    search="${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
    IFS=:
    for dir in $search; do
        unset IFS
        [ "$dir" -a -d "$dir/xfce4/helpers" ] || continue
        file="$dir/xfce4/helpers/$1"
        # We have the file, no need to create it.
        [ -r "$file" ] && return
    done
    IFS=:
    for dir in $search; do
        unset IFS
        [ "$dir" -a -d "$dir/applications" ] || continue
        file="$dir/applications/$1"
        if [ -r "$file" ]; then
            # Found a file to convert.
            target="${XDG_DATA_HOME:-$HOME/.local/share}/xfce4/helpers"
            mkdir -p "$target"
            grep -v "^Type=" "$file" > "$target/$1"
            echo "Type=X-XFCE-Helper" >> "$target/$1"
            echo "X-XFCE-Category=WebBrowser" >> "$target/$1"
            # Change %F, %f, %U, and %u to "%s".
            command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | sed -e 's/%[FfUu]/"%s"/g'`"
            echo "X-XFCE-Commands=`echo "$command" | first_word`" >> "$target/$1"
            echo "X-XFCE-CommandsWithParameter=$command" >> "$target/$1"
            return
        fi
    done
    return 1
}

set_browser_xfce()
{
    check_xfce_desktop_file "$1" || exit_failure_operation_failed

    helper_dir="${XDG_CONFIG_HOME:-$HOME/.config}/xfce4"
    if [ ! -d "$helper_dir" ]; then
        mkdir -p "$helper_dir" || exit_failure_operation_failed
    fi

    helpers_rc="$helper_dir/helpers.rc"
    # Create the file if it does not exist to avoid special cases below.
    if [ ! -r "$helpers_rc" ]; then
        touch "$helpers_rc" || exit_failure_operation_failed
    fi

    temp="`mktemp "$helpers_rc.XXXXXX"`" || return
    grep -v "^WebBrowser=" "$helpers_rc" >> "$temp"
    echo "WebBrowser=${1%.desktop}" >> "$temp"

    oldlines="`wc -l < "$helpers_rc"`"
    newlines="`wc -l < "$temp"`"
    # The new file should have at least as many lines as the old.
    if [ $oldlines -le $newlines ]; then
        mv "$temp" "$helpers_rc"
    else
        rm -f "$temp"
        return 1
    fi
}

# }}} xfce
# }}} default browser

dispatch_specific()
{
    # The PROP comments in this function are used to generate the output of
    # the --list option. The formatting is important. Make sure to line up the
    # property descriptions with spaces so that it will look nice.
    if [ x"$op" = x"get" ]; then
        case "$parm" in
          default-web-browser) # PROP:           Default web browser
            get_browser_$DE
            ;;

          *)
            exit_failure_syntax
            ;;
        esac
    elif [ x"$op" = x"check" ]; then
        case "$parm" in
          default-web-browser)
            check_desktop_filename "$1"
            check_browser_$DE "$1"
            ;;

          *)
            exit_failure_syntax
            ;;
        esac
    else # set
        [ $# -eq 1 ] || exit_failure_syntax "unexpected/missing argument"
        case "$parm" in
          default-web-browser)
            check_desktop_filename "$1"
            set_browser_$DE "$1"
            ;;

          *)
            exit_failure_syntax
            ;;
        esac
    fi

    if [ $? -eq 0 ]; then
        exit_success
    else
        exit_failure_operation_failed
    fi
}

dispatch_generic()
{
    # We only know how to get or check the default web browser.
    [ x"$op" != x"get" -a x"$op" != x"check" ] && exit_failure_operation_impossible
    [ x"$parm" != x"default-web-browser" ] && exit_failure_operation_impossible

    # First look in $BROWSER
    if [ x"$BROWSER" != x ]; then
        binary="`which "${BROWSER%%:*}"`"
    else
        # Debian and Ubuntu (and others?) have x-www-browser.
        binary="`which x-www-browser`"
    fi

    [ "$binary" ] || exit_failure_operation_failed

    binary="`readlink -f "$binary"`"

    [ "$binary" ] || exit_failure_operation_failed

    if [ x"$op" = x"get" ]; then
        desktop="`binary_to_desktop_file "$binary"`"
        basename "$desktop"
    else
        # $op = "check"
        check="`desktop_file_to_binary "$1"`"
        if [ -z "$check" ]; then
            echo no
            exit_success
        fi
        if [ x"$binary" != x"$check" ]; then
            echo no
            exit_success
        fi
        echo yes
    fi
    exit_success
}

if [ x"$1" = x"--list" ]; then
    echo "Known properties:"
    # Extract the property names from dispatch_specific() above.
    grep "^[ 	]*[^)]*) # PROP:" "$0" | sed -e 's/^[ 	]*\([^)]*\)) # PROP: \(.*\)$/  \1 \2/' | sort
    exit_success
fi

[ x"$1" != x ] || exit_failure_syntax "no operation given"
[ x"$2" != x ] || exit_failure_syntax "no parameter name given"
[ x"$1" = x"get" -o x"$3" != x ] || exit_failure_syntax "no parameter value given"

op="$1"
parm="$2"
shift 2

if [ x"$op" != x"get" -a x"$op" != x"check" -a x"$op" != x"set" ]; then
  exit_failure_syntax "invalid operation"
fi

detectDE

case "$DE" in
    kde|gnome|xfce)
    dispatch_specific "$@"
    ;;

    generic)
    dispatch_generic "$@"
    ;;

    *)
    exit_failure_operation_impossible "unknown desktop environment"
    ;;
esac