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, -c or --stat,
  34 # default to --cc.
  35 case " $flags " in
  36 *" '--name-status' "* | *" '--name-only' "* | *" '-r' "* | *" '-c' "* | \
  37 *" '--stat' "*)
  38         ;;
  39 *)
  40         flags="$flags'$cc_or_p' " ;;
  41 esac
  42
  43 # If we do not have -B, -C, -r, nor -p, default to -M.
  44 case " $flags " in
  45 *" '-"[BCMrp]* | *" '--find-copies-harder' "*)
  46         ;; # something like -M50.
  47 *)
  48         flags="$flags'-M' " ;;
  49 esac
  50
  51 case "$rev" in
  52 ?*' '?*' '?*)
  53         usage
  54         ;;
  55 ?*' '^?*)
  56         begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&
  57         end=$(expr "$rev" : '.\([0-9a-f]*\). .*') || exit
  58         cmd="git-diff-tree $flags $begin $end -- $files"
  59         ;;
  60 ?*' '?*)
  61         cmd="git-diff-tree $flags $rev -- $files"
  62         ;;
  63 ?*' ')
  64         cmd="git-diff-index $flags $rev -- $files"
  65         ;;
  66 '')
  67         cmd="git-diff-files $flags -- $files"
  68         ;;
  69 *)
  70         usage
  71         ;;
  72 esac
  73
  74 eval "$cmd"