reflog [show]: display sensible -h output

Change the "git reflog show -h" output to show the usage summary
relevant to it, rather than displaying the same output that "git log
-h" would show.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2 files changed, 28 insertions, 2 deletions

diff --git a/builtin/reflog.c b/builtin/reflog.c
index 6bd176fe91..6c4fe1af40 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -5,6 +5,9 @@
 #include "worktree.h"
 #include "reflog.h"
 
+#define BUILTIN_REFLOG_SHOW_USAGE \
+	N_("git reflog [show] [<log-options>] [<ref>]")
+
 #define BUILTIN_REFLOG_EXPIRE_USAGE \
 	N_("git reflog expire [--expire=<time>] [--expire-unreachable=<time>]\n" \
 	   "                  [--rewrite] [--updateref] [--stale-fix]\n" \
@@ -17,6 +20,11 @@
 #define BUILTIN_REFLOG_EXISTS_USAGE \
 	N_("git reflog exists <ref>")
 
+static const char *const reflog_show_usage[] = {
+	BUILTIN_REFLOG_SHOW_USAGE,
+	NULL,
+};
+
 static const char *const reflog_expire_usage[] = {
 	BUILTIN_REFLOG_EXPIRE_USAGE,
 	NULL
@@ -33,7 +41,7 @@ static const char *const reflog_exists_usage[] = {
 };
 
 static const char *const reflog_usage[] = {
-	N_("git reflog [show] [<log-options>] [<ref>]"),
+	BUILTIN_REFLOG_SHOW_USAGE,
 	BUILTIN_REFLOG_EXPIRE_USAGE,
 	BUILTIN_REFLOG_DELETE_USAGE,
 	BUILTIN_REFLOG_EXISTS_USAGE,
@@ -207,6 +215,19 @@ static int expire_total_callback(const struct option *opt,
 	return 0;
 }
 
+static int cmd_reflog_show(int argc, const char **argv, const char *prefix)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+
+	parse_options(argc, argv, prefix, options, reflog_show_usage,
+		      PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0 |
+		      PARSE_OPT_KEEP_UNKNOWN);
+
+	return cmd_log_reflog(argc - 1, argv + 1, prefix);
+}
+
 static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
 {
 	struct cmd_reflog_expire_cb cmd = { 0 };
@@ -404,7 +425,7 @@ int cmd_reflog(int argc, const char **argv, const char *prefix)
 		goto log_reflog;
 
 	if (!strcmp(argv[1], "show"))
-		return cmd_log_reflog(argc - 1, argv + 1, prefix);
+		return cmd_reflog_show(argc, argv, prefix);
 	else if (!strcmp(argv[1], "expire"))
 		return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 	else if (!strcmp(argv[1], "delete"))
diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index 0dc36d842b..3f469353ec 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -111,6 +111,11 @@ test_expect_success 'correct usage on sub-command -h' '
 	grep "git reflog expire" err
 '
 
+test_expect_success 'correct usage on "git reflog show -h"' '
+	test_expect_code 129 git reflog show -h >err &&
+	grep -F "git reflog [show]" err
+'
+
 test_expect_success 'pass through -- to sub-command' '
 	test_when_finished "rm -rf repo" &&
 	git init repo &&