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 # I often say 'git diff --cached -p' and get scolded by git-diff-files, but
  11 # obviously I mean 'git diff --cached -p HEAD' in that case.
  12 case "$rev" in
  13 '')
  14         case " $flags " in
  15         *" '--cached' "*)
  16                 rev='HEAD '
  17                 ;;
  18         esac
  19 esac
  20
  21 # If we do not have --name-status, --name-only nor -r, default to -p.
  22 # If we do not have -B nor -C, default to -M.
  23 case " $flags " in
  24 *" '--name-status' "* | *" '--name-only' "* | *" '-r' "* )
  25         ;;
  26 *)
  27         flags="$flags'-p' " ;;
  28 esac
  29 case " $flags " in
  30 *" '-"[BCM]* | *" '--find-copies-harder' "*)
  31         ;; # something like -M50.
  32 *)
  33         flags="$flags'-M' " ;;
  34 esac
  35
  36 case "$rev" in
  37 ?*' '?*' '?*)
  38         echo >&2 "I don't understand"
  39         exit 1
  40         ;;
  41 ?*' '^?*)
  42         begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&
  43         end=$(expr "$rev" : '.\([0-9a-f]*\). .*') || exit
  44         cmd="git-diff-tree $flags $begin $end -- $files"
  45         ;;
  46 ?*' '?*)
  47         cmd="git-diff-tree $flags $rev -- $files"
  48         ;;
  49 ?*' ')
  50         cmd="git-diff-index $flags $rev -- $files"
  51         ;;
  52 '')
  53         cmd="git-diff-files $flags -- $files"
  54         ;;
  55 *)
  56         die "I don't understand $*"
  57         ;;
  58 esac
  59
  60 eval "$cmd"