git-diff.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 # Copyright (c) 2005 Junio C Hamano
   5
   6 USAGE='[ --diff-options ] <ent>{0,2} [<path>...]'
   7 SUBDIRECTORY_OK='Yes'
   8 . git-sh-setup
   9
  10 rev=$(git-rev-parse --revs-only --no-flags --sq "$@") || exit
  11 flags=$(git-rev-parse --no-revs --flags --sq "$@")
  12 files=$(git-rev-parse --no-revs --no-flags --sq "$@")
  13
  14 # I often say 'git diff --cached -p' and get scolded by git-diff-files, but
  15 # obviously I mean 'git diff --cached -p HEAD' in that case.
  16 case "$rev" in
  17 '')
  18         case " $flags " in
  19         *" '--cached' "*)
  20                 rev='HEAD '
  21                 ;;
  22         esac
  23 esac
  24
  25 # If we do not have --name-status, --name-only nor -r, default to -p.
  26 # If we do not have -B nor -C, default to -M.
  27 case " $flags " in
  28 *" '--name-status' "* | *" '--name-only' "* | *" '-r' "* )
  29         ;;
  30 *)
  31         flags="$flags'-p' " ;;
  32 esac
  33 case " $flags " in
  34 *" '-"[BCM]* | *" '--find-copies-harder' "*)
  35         ;; # something like -M50.
  36 *)
  37         flags="$flags'-M' " ;;
  38 esac
  39
  40 case "$rev" in
  41 ?*' '?*' '?*)
  42         usage
  43         ;;
  44 ?*' '^?*)
  45         begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&
  46         end=$(expr "$rev" : '.\([0-9a-f]*\). .*') || exit
  47         cmd="git-diff-tree $flags $begin $end -- $files"
  48         ;;
  49 ?*' '?*)
  50         cmd="git-diff-tree $flags $rev -- $files"
  51         ;;
  52 ?*' ')
  53         cmd="git-diff-index $flags $rev -- $files"
  54         ;;
  55 '')
  56         cmd="git-diff-files $flags -- $files"
  57         ;;
  58 *)
  59         usage
  60         ;;
  61 esac
  62
  63 eval "$cmd"