git-reset [--mixed] <tree> [--] <paths>...

Sometimes it is asked on the list how to revert selected path in
the index from a tree, most often HEAD, without affecting the
files in the working tree.  A similar operation that also
affects the working tree files has been available in the form of
"git checkout <tree> -- <paths>...".

By definition --soft would never affect either the index nor the
working tree files, and --hard is the way to make the working
tree files as close to pristine, so this new option is available
only for the default --mixed case.

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

git-reset.sh

@@ -1,35 +1,60 @@
 #!/bin/sh
-
+#
-USAGE='[--mixed | --soft | --hard]  [<commit-ish>]'
+# Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
+#
+USAGE='[--mixed | --soft | --hard]  [<commit-ish>] [ [--] <paths>...]'
 SUBDIRECTORY_OK=Yes
 . git-sh-setup
 
+update= reset_type=--mixed
+unset rev
+
+while case $# in 0) break ;; esac
+do
+	case "$1" in
+	--mixed | --soft | --hard)
+		reset_type="$1"
+		;;
+	--)
+		break
+		;;
+	-*)
+		usage
+		;;
+	*)
+		rev=$(git-rev-parse --verify "$1") || exit
+		shift
+		break
+		;;
+	esac
+	shift
+done
+
+: ${rev=HEAD}
+rev=$(git-rev-parse --verify $rev^0) || exit
+
+# Skip -- in "git reset HEAD -- foo" and "git reset -- foo".
+case "$1" in --) shift ;; esac
+
+# git reset --mixed tree [--] paths... can be used to
+# load chosen paths from the tree into the index without
+# affecting the working tree nor HEAD.
+if test $# != 0
+then
+	test "$reset_type" == "--mixed" ||
+		die "Cannot do partial $reset_type reset."
+	git ls-tree -r --full-name $rev -- "$@" |
+	git update-index --add --index-info || exit
+	git update-index --refresh
+	exit
+fi
+
 TOP=$(git-rev-parse --show-cdup)
 if test ! -z "$TOP"
 then
 	cd "$TOP"
 fi
 
-update=
-reset_type=--mixed
-case "$1" in
---mixed | --soft | --hard)
-	reset_type="$1"
-	shift
-	;;
--*)
-        usage ;;
-esac
-
-case $# in
-0) rev=HEAD ;;
-1) rev=$(git-rev-parse --verify "$1") || exit ;;
-*) usage ;;
-esac
-rev=$(git-rev-parse --verify $rev^0) || exit
-
-# We need to remember the set of paths that _could_ be left
-# behind before a hard reset, so that we can remove them.
 if test "$reset_type" = "--hard"
 then
 	update=-u