Re: [PATCH v2 18/34] sequencer (rebase -i): refactor setting the reflog message

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 <redacted>
---
 sequencer.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 33fb36dcbe..d20efad562 100644
--- a/sequencer.c
+++ b/sequencer.c

@@ -1750,6 +1750,26 @@ 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;
+}