[PATCH 4/5] sequencer: handle single commit pick separately

[Ramkumar Ramachandra <artagnon@gmail.com>]

Don't write a '.git/sequencer/todo', as CHERRY_PICK_HEAD already
contains this information.  However, '.git/sequencer/opts' and
'.git/sequencer/head' are required to support '--reset' and
'--continue' operations.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 sequencer.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 517eb23..6762ceb 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -746,6 +746,15 @@ static int pick_commits(struct replay_insn_list *todo_list,
 				opts->record_origin || opts->edit));
 	read_and_refresh_cache(opts);
 
+	/*
+	 * Backward compatibility hack: when only a single commit is
+	 * picked, don't save_todo(), because CHERRY_PICK_HEAD will
+	 * contain this information anyway.
+	 */
+	if (opts->subcommand == REPLAY_NONE &&
+		todo_list->next == NULL && todo_list->action == REPLAY_PICK)
+		return do_pick_commit(todo_list->operand, REPLAY_PICK, opts);
+
 	for (cur = todo_list; cur; cur = cur->next) {
 		save_todo(cur);
 		res = do_pick_commit(cur->operand, cur->action, opts);
-- 
1.7.6.351.gb35ac.dirty