From: Junio C Hamano <junkio@cox.net>
Date: Fri, 23 Sep 2005 07:53:02 +0000 (-0700)
Subject: Make 'git diff --cached' synonymous to 'git diff --cached HEAD'.
X-Git-Tag: v0.99.7c~2^2~10
X-Git-Url: https://git.octo.it/?a=commitdiff_plain;ds=sidebyside;h=9f92f15f897fa1a943bcec324032cc4ca1f73ecf;p=git.git

Make 'git diff --cached' synonymous to 'git diff --cached HEAD'.

When making changes to different files (i.e. dirty working tree) and
committing logically separate changes in groups, often it is necessary
to run 'git diff --cached HEAD' to make sure that the changes being
committed makes sense.  Saying 'git diff --cached' by mistake gives
rather uninformative error message from git-diff-files complaining it
does not understand --cached flag.

Signed-off-by: Junio C Hamano <junkio@cox.net>
---

diff --git a/git-diff.sh b/git-diff.sh
index 9732c8ac..84a152af 100755
--- a/git-diff.sh
+++ b/git-diff.sh
@@ -9,9 +9,21 @@ files=$(git-rev-parse --no-revs --no-flags --sq "$@")
 
 : ${flags:="'-M' '-p'"}
 
+# 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 " $flags " in
+	*" '--cached' "*)
+		rev='HEAD '
+		;;
+	esac
+esac
+
 case "$rev" in
 ?*' '?*' '?*)
-	die "I don't understand"
+	echo >&2 "I don't understand"
+	exit 1
 	;;
 ?*' '^?*)
 	begin=$(expr "$rev" : '.*^.\([0-9a-f]*\).*') &&