bin/ls-ignore

   1 #!/usr/bin/env bash
   2
   3 set -e
   4
   5 # List ignored files of current directory by constructing a "find"
   6 # expression that matches names of ignored files.
   7 #
   8 # This script supports a reasonable subset of "gitignore(5)"
   9 # semantics.  Notably, it does support:
  10 #  * Patterns read from .gitignore files in current and parent directories
  11 #  * Blank line separators
  12 #  * Leading "#" comments
  13 #  * Trailing "/" directory patterns
  14 #  * Leading "/" this-directory patterns
  15 # and it does not support:
  16 #  * Patterns read from $GIT_DIR/info/exclude
  17 #    (b/c inappropriate for a source release)
  18 #  * Patterns read from file specified by configuration variable core.excludesfile
  19 #    (b/c inappropriate for a source release)
  20 #  * Leading "!" negation patterns
  21 #    (b/c complex semantics)
  22 #  * Internal "/" FNM_PATHNAME patterns
  23 #    (b/c complex semantics incompatible with '-path' primary)
  24
  25 name=$(basename "$0")
  26 dir=$(dirname "$0")
  27 root=$(cd "$dir/.." && pwd)
  28
  29 ignore='.gitignore'
  30
  31 declare -a fargs
  32 fargs+=("(")
  33 fargs+=("-exec")
  34 fargs+=("false")
  35 fargs+=(";")
  36 idir="."
  37 while true; do
  38     if [ -r "$idir/$ignore" ]; then
  39         while IFS= read -r opat; do
  40             pat="$opat"
  41             ## Blank line: Separator -- supported
  42             if [ -z "$pat" ]; then
  43                 continue
  44             fi
  45             ## Leading "#": Comment -- supported
  46             if [ "${pat:0:1}" = "#" ]; then
  47                 continue
  48             fi
  49             ## Leading "\#": Pattern beginning with "#" -- supported
  50             if [ "${pat:0:2}" = "\#" ]; then
  51                 pat="#${pat:2}"
  52             fi
  53             ## Leading "!": Negated pattern -- unsupported
  54             if [ "${pat:0:1}" = "!" ]; then
  55                 echo "$name:: unsupported pattern: $opat"
  56                 exit 1
  57             fi
  58             ## Leading "\!": Pattern beginning with "!" -- supported
  59             if [ "${pat:0:2}" = "\!" ]; then
  60                 pat="!${pat:2}"
  61             fi
  62             ## Trailing "/": Directory pattern -- supported
  63             if [ "${pat:$((${#pat}-1)):1}" = "/" ]; then
  64                 dirPat="yes"
  65                 pat="${pat:0:$((${#pat}-1))}"
  66             else
  67                 dirPat="no"
  68             fi
  69             ## Leading "/": This-directory pattern -- supported
  70             if [ "${pat:0:1}" = "/" ]; then
  71                 if [ "$idir" = "." ]; then
  72                     pat="${pat:1}"
  73                 else
  74                     continue
  75                 fi
  76             fi
  77             ## Internal "/": FNM_PATHNAME pattern -- unsupported
  78             if [ -z "${pat##*/*}" ]; then
  79                 echo "$name:: unsupported pattern: $opat"
  80                 exit 1
  81             fi
  82             fargs+=("-o")
  83             fargs+=("(")
  84             if [ "$dirPat" = "yes" ]; then
  85                 fargs+=("-type")
  86                 fargs+=("d")
  87             fi
  88             fargs+=("-name")
  89             fargs+=("$pat")
  90             fargs+=(")")
  91         done < "$idir/$ignore"
  92     fi
  93     if [ "$(cd "$idir" && pwd)" != "$root" ]; then
  94         idir="../$idir"
  95     else
  96         break
  97     fi
  98 done
  99 fargs+=(")")
 100
 101 find . -mindepth 1 -maxdepth 1 "${fargs[@]}" -print