[PATCH] format-patch: Add --rfc for the common case of [RFC PATCH]

[Josh Triplett <josh@joshtriplett.org>]

This provides a shorter and more convenient alias for
--subject-prefix='RFC PATCH'.

Add a test covering --rfc.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
---

By far, the most common subject-prefix I've seen other than "PATCH" is
"RFC PATCH" (or occasionally "PATCH RFC").  Seems worth optimizing for
the common case, to avoid having to spell it out the long way as
--subject-prefix='RFC PATCH'.

 builtin/log.c           | 10 ++++++++++
 t/t4014-format-patch.sh |  9 +++++++++
 2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/builtin/log.c b/builtin/log.c
index 92dc34d..48d6a38 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1112,6 +1112,13 @@ static int subject_prefix_callback(const struct option *opt, const char *arg,
 	return 0;
 }
 
+static int rfc_callback(const struct option *opt, const char *arg, int unset)
+{
+	subject_prefix = 1;
+	((struct rev_info *)opt->value)->subject_prefix = xstrdup("RFC PATCH");
+	return 0;
+}
+
 static int numbered_cmdline_opt = 0;
 
 static int numbered_callback(const struct option *opt, const char *arg,
@@ -1419,6 +1426,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 			    N_("start numbering patches at <n> instead of 1")),
 		OPT_INTEGER('v', "reroll-count", &reroll_count,
 			    N_("mark the series as Nth re-roll")),
+		{ OPTION_CALLBACK, 0, "rfc", &rev, NULL,
+			    N_("Use [RFC PATCH] instead of [PATCH]"),
+			    PARSE_OPT_NOARG | PARSE_OPT_NONEG, rfc_callback },
 		{ OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
 			    N_("Use [<prefix>] instead of [PATCH]"),
 			    PARSE_OPT_NONEG, subject_prefix_callback },
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index b0579dd..81b0498 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1073,6 +1073,15 @@ test_expect_success 'empty subject prefix does not have extra space' '
 	test_cmp expect actual
 '
 
+cat >expect <<'EOF'
+Subject: [RFC PATCH 1/1] header with . in it
+EOF
+test_expect_success '--rfc' '
+	git format-patch -n -1 --stdout --rfc >patch &&
+	grep ^Subject: patch >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success '--from=ident notices bogus ident' '
 	test_must_fail git format-patch -1 --stdout --from=foo >patch
 '

base-commit: 6ebdac1bab966b720d776aa43ca188fe378b1f4b
-- 
git-series 0.8.10