[PATCH/RFC 02/10] Teach rebase interactive the reset command

["Jörg Sommer" <joerg@alea.gnuu.de>]

---
 git-rebase--interactive.sh    |   20 ++++++++++++++++++++
 t/t3404-rebase-interactive.sh |   10 ++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index b001ddf..7dac51b 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -258,6 +258,16 @@ parse_mark() {
 	return 1
 }
 
+mark_to_sha1() {
+	local mark
+	if mark=$(parse_mark $1)
+	then
+		cat "$MARKS"/$mark
+	else
+		return 1
+	fi
+}
+
 do_next () {
 	rm -f "$DOTEST"/message "$DOTEST"/author-script \
 		"$DOTEST"/amend || exit
@@ -352,6 +362,15 @@ do_next () {
 		git rev-parse --verify HEAD > "$MARKS"/$mark || \
 			die "HEAD is invalid"
 		;;
+	reset|r)
+		comment_for_reflog reset
+
+		mark_action_done
+		tmp=$(mark_to_sha1 $sha1) || \
+			tmp=$(git rev-parse --verify $sha1) ||
+			die "Invalid parent '$sha1' in $command $sha1 $rest"
+		output git reset --hard $tmp
+		;;
 	*)
 		warn "Unknown command: $command $sha1 $rest"
 		die_with_patch $sha1 "Please fix this in the file $TODO."
@@ -569,6 +588,7 @@ do
 #  edit = use commit, but stop for amending
 #  squash = use commit, but meld into previous commit
 #  mark #NUM = mark the current HEAD for later reference
+#  reset #NUM|commit = reset HEAD to a previous set mark or a commit
 #
 # If you remove a line here THAT COMMIT WILL BE LOST.
 # However, if you remove everything, the rebase will be aborted.
diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 4461674..521206f 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -85,6 +85,9 @@ for line in $FAKE_LINES; do
 	mark*)
 		echo "mark ${line#mark}"
 		echo "mark ${line#mark}" >> "$1";;
+	reset*)
+		echo "reset ${line#reset}"
+		echo "reset ${line#reset}" >> "$1";;
 	*)
 		echo sed -n "${line}s/^pick/$action/p"
 		sed -n "${line}p" < "$1".tmp
@@ -210,6 +213,13 @@ test_expect_success 'setting marks works' '
 	git rebase --abort
 '
 
+test_expect_success 'reset with nonexistent mark fails' '
+	export FAKE_LINES="reset#0 1" &&
+	test_must_fail git rebase -i HEAD~1 &&
+	unset FAKE_LINES &&
+	git rebase --abort
+'
+
 test_expect_success 'preserve merges with -p' '
 	git checkout -b to-be-preserved master^ &&
 	: > unrelated-file &&
-- 
1.5.4.5