describe: when failing, tell the user about options that work

diff --git a/builtin-check-ref-format.c b/builtin-check-ref-format.c
index 39db6cbe47d77f84bd2d1d8d98942be89aaa1bf7..f9381e07eaeda673e91ef6250eca4027c5ba0278 100644 (file)
--- a/builtin-check-ref-format.c
+++ b/builtin-check-ref-format.c
@@ -11,9 +11,8 @@ int cmd_check_ref_format(int argc, const char **argv, const char *prefix)
 {
        if (argc == 3 && !strcmp(argv[1], "--branch")) {
                struct strbuf sb = STRBUF_INIT;
-               strbuf_branchname(&sb, argv[2]);
-               strbuf_splice(&sb, 0, 0, "refs/heads/", 11);
-               if (check_ref_format(sb.buf))
+
+               if (strbuf_check_branch_ref(&sb, argv[2]))
                        die("'%s' is not a valid branch name", argv[2]);
                printf("%s\n", sb.buf + 11);
                exit(0);