/usr/share/gocode/src/github.com/kballard/go-shellquote/quote.go is in golang-github-kballard-go-shellquote-dev 0.0~git20150810.0.d8ec1a6-1.
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 | package shellquote
import (
"bytes"
"strings"
"unicode/utf8"
)
// Join quotes each argument and joins them with a space.
// If passed to /bin/sh, the resulting string will be split back into the
// original arguments.
func Join(args ...string) string {
var buf bytes.Buffer
for i, arg := range args {
if i != 0 {
buf.WriteByte(' ')
}
quote(arg, &buf)
}
return buf.String()
}
const (
specialChars = "\\'\"`${[|&;<>()*?!"
extraSpecialChars = " \t\n"
prefixChars = "~"
)
func quote(word string, buf *bytes.Buffer) {
// We want to try to produce a "nice" output. As such, we will
// backslash-escape most characters, but if we encounter a space, or if we
// encounter an extra-special char (which doesn't work with
// backslash-escaping) we switch over to quoting the whole word. We do this
// with a space because it's typically easier for people to read multi-word
// arguments when quoted with a space rather than with ugly backslashes
// everywhere.
origLen := buf.Len()
if len(word) == 0 {
// oops, no content
buf.WriteString("''")
return
}
cur, prev := word, word
atStart := true
for len(cur) > 0 {
c, l := utf8.DecodeRuneInString(cur)
cur = cur[l:]
if strings.ContainsRune(specialChars, c) || (atStart && strings.ContainsRune(prefixChars, c)) {
// copy the non-special chars up to this point
if len(cur) < len(prev) {
buf.WriteString(prev[0 : len(prev)-len(cur)-l])
}
buf.WriteByte('\\')
buf.WriteRune(c)
prev = cur
} else if strings.ContainsRune(extraSpecialChars, c) {
// start over in quote mode
buf.Truncate(origLen)
goto quote
}
atStart = false
}
if len(prev) > 0 {
buf.WriteString(prev)
}
return
quote:
// quote mode
// Use single-quotes, but if we find a single-quote in the word, we need
// to terminate the string, emit an escaped quote, and start the string up
// again
inQuote := false
for len(word) > 0 {
i := strings.IndexRune(word, '\'')
if i == -1 {
break
}
if i > 0 {
if !inQuote {
buf.WriteByte('\'')
inQuote = true
}
buf.WriteString(word[0:i])
word = word[i+1:]
}
if inQuote {
buf.WriteByte('\'')
inQuote = false
}
buf.WriteString("\\'")
}
if len(word) > 0 {
if !inQuote {
buf.WriteByte('\'')
}
buf.WriteString(word)
buf.WriteByte('\'')
}
}
|