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 die () {
  11     echo >&2 "$*"
  12     exit 1
  13 }
  14
  15 # I often say 'git diff --cached -p' and get scolded by git-diff-files, but
  16 # obviously I mean 'git diff --cached -p HEAD' in that case.
  17 case "$rev" in
  18 '')
  19         case " $flags " in
  20         *" '--cached' "*)
  21                 rev='HEAD '
  22                 ;;
  23         esac
  24 esac
  25
  26 # If we do not have --name-status, --name-only nor -r, default to -p.
  27 # If we do not have -B nor -C, default to -M.
  28 case " $flags " in
  29 *" '--name-status' "* | *" '--name-only' "* | *" '-r' "* )
  30         ;;
  31 *)
  32         flags="$flags'-p' " ;;
  33 esac
  34 case " $flags " in
  35 *" '-"[BCM]* | *" '--find-copies-harder' "*)
  36         ;; # something like -M50.
  37 *)
  38         flags="$flags'-M' " ;;
  39 esac
  40
  41 case "$rev" in
  42 ?*' '?*' '?*)
  43         echo >&2 "I don't understand"
  44         exit 1
  45         ;;
  46 ?*' '^?*)
  47         begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&
  48         end=$(expr "$rev" : '.\([0-9a-f]*\). .*') || exit
  49         cmd="git-diff-tree $flags $begin $end -- $files"
  50         ;;
  51 ?*' '?*)
  52         cmd="git-diff-tree $flags $rev -- $files"
  53         ;;
  54 ?*' ')
  55         cmd="git-diff-index $flags $rev -- $files"
  56         ;;
  57 '')
  58         cmd="git-diff-files $flags -- $files"
  59         ;;
  60 *)
  61         die "I don't understand $*"
  62         ;;
  63 esac
  64
  65 eval "$cmd"