git-diff.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 # Copyright (c) 2005 Junio C Hamano
   5
   6 rev=$(git-rev-parse --revs-only --no-flags --sq "$@") || exit
   7 flags=$(git-rev-parse --no-revs --flags --sq "$@")
   8 files=$(git-rev-parse --no-revs --no-flags --sq "$@")
   9
  10 : ${flags:="'-M' '-p'"}
  11
  12 die () {
  13     echo >&2 "$*"
  14     exit 1
  15 }
  16
  17 # I often say 'git diff --cached -p' and get scolded by git-diff-files, but
  18 # obviously I mean 'git diff --cached -p HEAD' in that case.
  19 case "$rev" in
  20 '')
  21         case " $flags " in
  22         *" '--cached' "*)
  23                 rev='HEAD '
  24                 ;;
  25         esac
  26 esac
  27
  28 case "$rev" in
  29 ?*' '?*' '?*)
  30         echo >&2 "I don't understand"
  31         exit 1
  32         ;;
  33 ?*' '^?*)
  34         begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&
  35         end=$(expr "$rev" : '.\([0-9a-f]*\). .*') || exit
  36         cmd="git-diff-tree $flags $begin $end -- $files"
  37         ;;
  38 ?*' '?*)
  39         cmd="git-diff-tree $flags $rev -- $files"
  40         ;;
  41 ?*' ')
  42         cmd="git-diff-index $flags $rev -- $files"
  43         ;;
  44 '')
  45         cmd="git-diff-files $flags -- $files"
  46         ;;
  47 *)
  48         die "I don't understand $*"
  49         ;;
  50 esac
  51
  52 eval "$cmd"