1 files changed, 65 insertions, 0 deletions
diff --git a/git-diff.sh b/git-diff.sh
new file mode 100755
index 0000000000..b62e58341c
--- /dev/null
+++ b/git-diff.sh
@@ -0,0 +1,65 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Linus Torvalds
+# Copyright (c) 2005 Junio C Hamano
+
+rev=$(git-rev-parse --revs-only --no-flags --sq "$@") || exit
+flags=$(git-rev-parse --no-revs --flags --sq "$@")
+files=$(git-rev-parse --no-revs --no-flags --sq "$@")
+
+die () {
+    echo >&2 "$*"
+    exit 1
+}
+
+# I often say 'git diff --cached -p' and get scolded by git-diff-files, but
+# obviously I mean 'git diff --cached -p HEAD' in that case.
+case "$rev" in
+'')
+	case " $flags " in
+	*" '--cached' "*)
+		rev='HEAD '
+		;;
+	esac
+esac
+
+# If we do not have --name-status, --name-only nor -r, default to -p.
+# If we do not have -B nor -C, default to -M.
+case " $flags " in
+*" '--name-status' "* | *" '--name-only' "* | *" '-r' "* )
+	;;
+*)
+	flags="$flags'-p' " ;;
+esac
+case " $flags " in
+*" '-"[BCM]* | *" '--find-copies-harder' "*)
+	;; # something like -M50.
+*)
+	flags="$flags'-M' " ;;
+esac
+
+case "$rev" in
+?*' '?*' '?*)
+	echo >&2 "I don't understand"
+	exit 1
+	;;
+?*' '^?*)
+	begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&
+	end=$(expr "$rev" : '.\([0-9a-f]*\). .*') || exit
+	cmd="git-diff-tree $flags $begin $end -- $files"
+	;;
+?*' '?*)
+	cmd="git-diff-tree $flags $rev -- $files"
+	;;
+?*' ')
+	cmd="git-diff-index $flags $rev -- $files"
+	;;
+'')
+	cmd="git-diff-files $flags -- $files"
+	;;
+*)
+	die "I don't understand $*"
+	;;
+esac
+
+eval "$cmd"