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 have -[123] --ours --theirs --base, don't do --cc by default.
  26 case " $flags " in
  27 *" '-"[123]"' "* | *" '--ours' "* | *" '--base' "* | *" '--theirs' "*)
  28         cc_or_p=-p ;;
  29 *)
  30         cc_or_p=--cc ;;
  31 esac
  32
  33 # If we do not have --name-status, --name-only, -r, or -c default to --cc.
  34 case " $flags " in
  35 *" '--name-status' "* | *" '--name-only' "* | *" '-r' "* | *" '-c' "* )
  36         ;;
  37 *)
  38         flags="$flags'$cc_or_p' " ;;
  39 esac
  40
  41 # If we do not have -B, -C, -r, nor -p, default to -M.
  42 case " $flags " in
  43 *" '-"[BCMrp]* | *" '--find-copies-harder' "*)
  44         ;; # something like -M50.
  45 *)
  46         flags="$flags'-M' " ;;
  47 esac
  48
  49 case "$rev" in
  50 ?*' '?*' '?*)
  51         usage
  52         ;;
  53 ?*' '^?*)
  54         begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&
  55         end=$(expr "$rev" : '.\([0-9a-f]*\). .*') || exit
  56         cmd="git-diff-tree $flags $begin $end -- $files"
  57         ;;
  58 ?*' '?*)
  59         cmd="git-diff-tree $flags $rev -- $files"
  60         ;;
  61 ?*' ')
  62         cmd="git-diff-index $flags $rev -- $files"
  63         ;;
  64 '')
  65         cmd="git-diff-files $flags -- $files"
  66         ;;
  67 *)
  68         usage
  69         ;;
  70 esac
  71
  72 eval "$cmd"