[PATCH 18/34] sequencer (rebase -i): refactor setting the reflog message

[Johannes Schindelin <johannes.schindelin@xxxxxx>]

This makes the code DRYer, with the obvious benefit that we can enhance
the code further in a single place.

We can also reuse the functionality elsewhere by calling this new
function.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 sequencer.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 399fc8d..71730e6 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1726,6 +1726,26 @@ static int is_final_fixup(struct todo_list *todo_list)
 	return 1;
 }
 
+static const char *reflog_message(struct replay_opts *opts,
+	const char *sub_action, const char *fmt, ...)
+{
+	va_list ap;
+	static struct strbuf buf = STRBUF_INIT;
+
+	va_start(ap, fmt);
+	strbuf_reset(&buf);
+	strbuf_addstr(&buf, action_name(opts));
+	if (sub_action)
+		strbuf_addf(&buf, " (%s)", sub_action);
+	if (fmt) {
+		strbuf_addstr(&buf, ": ");
+		strbuf_vaddf(&buf, fmt, ap);
+	}
+	va_end(ap);
+
+	return buf.buf;
+}
+
 static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 {
 	int res = 0;
@@ -1796,6 +1816,7 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 
 		if (read_oneliner(&head_ref, rebase_path_head_name(), 0) &&
 				starts_with(head_ref.buf, "refs/")) {
+			const char *msg;
 			unsigned char head[20], orig[20];
 
 			if (get_sha1("HEAD", head))
@@ -1803,19 +1824,17 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 			if (!read_oneliner(&buf, rebase_path_orig_head(), 0) ||
 					get_sha1_hex(buf.buf, orig))
 				return error("Could not read orig-head");
-			strbuf_addf(&buf, "rebase -i (finish): %s onto ",
-				head_ref.buf);
 			if (!read_oneliner(&buf, rebase_path_onto(), 0))
 				return error("Could not read 'onto'");
-			if (update_ref(buf.buf, head_ref.buf, head, orig,
+			msg = reflog_message(opts, "finish", "%s onto %s",
+				head_ref.buf, buf.buf);
+			if (update_ref(msg, head_ref.buf, head, orig,
 					REF_NODEREF, UPDATE_REFS_MSG_ON_ERR))
 				return error("Could not update %s",
 					head_ref.buf);
-			strbuf_reset(&buf);
-			strbuf_addf(&buf,
-				"rebase -i (finish): returning to %s",
+			msg = reflog_message(opts, "finish", "returning to %s",
 				head_ref.buf);
-			if (create_symref("HEAD", head_ref.buf, buf.buf))
+			if (create_symref("HEAD", head_ref.buf, msg))
 				return error("Could not update HEAD to %s",
 					head_ref.buf);
 			strbuf_reset(&buf);
-- 
2.10.0.rc2.102.g5c102ec