[PATCH v2 05/13] Teach rebase interactive the reset command

@@ -351,6 +351,15 @@ do_next () {
 
 		git update-ref "$mark" HEAD || die "update-ref failed"
 		;;
+	reset|r)
+		comment_for_reflog reset
+
+		tmp=$(git rev-parse --verify "$(mark_to_ref $sha1)") ||
+			die "Invalid parent '$sha1' in $command $sha1 $rest"
+
+		mark_action_done
+		output git reset --hard $tmp
+		;;
 	*)
 		warn "Unknown command: $command $sha1 $rest"
 		die_with_patch $sha1 "Please fix this in the file $TODO."

@@ -572,6 +581,7 @@ do
 #  edit = use commit, but stop for amending
 #  squash = use commit, but meld into previous commit
 #  mark :mark = mark the current HEAD for later reference
+#  reset commit = reset HEAD to the commit
 #
 # If you remove a line here THAT COMMIT WILL BE LOST.
 # However, if you remove everything, the rebase will be aborted.

@@ -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

@@ -206,6 +209,20 @@ test_expect_success 'setting marks works' '
 	ls $marks_dir | wc -l | grep -Fx 0
 '
 
+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 'reset to HEAD is a nop' '
+	test_tick &&
+	head=$(git rev-parse --short HEAD) &&
+	FAKE_LINES="reset$head" git rebase -i HEAD~4 &&
+	test "$(git rev-parse --short HEAD)" = "$head"
+'
+
 test_expect_success 'preserve merges with -p' '
 	git checkout -b to-be-preserved master^ &&
 	: > unrelated-file &&