1#!/bin/sh
2#
3# Copyright (c) 2005 Linus Torvalds
4# Copyright (c) 2005 Junio C Hamano
5
6rev=$(git-rev-parse --revs-only --no-flags --sq "$@") || exit
7flags=$(git-rev-parse --no-revs --flags --sq "$@")
8files=$(git-rev-parse --no-revs --no-flags --sq "$@")
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.
12case "$rev" in
13'')
14 case " $flags " in
15 *" '--cached' "*)
16 rev='HEAD '
17 ;;
18 esac
19esac
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.
23case " $flags " in
24*" '--name-status' "* | *" '--name-only' "* | *" '-r' "* )
25 ;;
26*)
27 flags="$flags'-p' " ;;
28esac
29case " $flags " in
30*" '-"[BCM]* | *" '--find-copies-harder' "*)
31 ;; # something like -M50.
32*)
33 flags="$flags'-M' " ;;
34esac
35
36case "$rev" in
37?*' '?*' '?*)
38 echo >&2 "I don't understand"
39 exit 1
40 ;;
41?*' '^?*)
42 begin=$(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 $*"
57 ;;
58esac
59
60eval "$cmd"