builtin/bundle.c: let parse-options parse subcommands

'git bundle' parses its subcommands with a couple of if-else if
statements.  parse-options has just learned to parse subcommands, so
let's use that facility instead, with the benefits of shorter code,
handling missing or unknown subcommands, and listing subcommands for
Bash completion.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/bundle.c

@@ -195,30 +195,19 @@ static int cmd_bundle_unbundle(int argc, const char **argv, const char *prefix)
 
 int cmd_bundle(int argc, const char **argv, const char *prefix)
 {
+	parse_opt_subcommand_fn *fn = NULL;
 	struct option options[] = {
+		OPT_SUBCOMMAND("create", &fn, cmd_bundle_create),
+		OPT_SUBCOMMAND("verify", &fn, cmd_bundle_verify),
+		OPT_SUBCOMMAND("list-heads", &fn, cmd_bundle_list_heads),
+		OPT_SUBCOMMAND("unbundle", &fn, cmd_bundle_unbundle),
 		OPT_END()
 	};
-	int result;
 
 	argc = parse_options(argc, argv, prefix, options, builtin_bundle_usage,
-		PARSE_OPT_STOP_AT_NON_OPTION);
+			     0);
 
 	packet_trace_identity("bundle");
 
-	if (argc < 2)
-		usage_with_options(builtin_bundle_usage, options);
-
-	else if (!strcmp(argv[0], "create"))
-		result = cmd_bundle_create(argc, argv, prefix);
-	else if (!strcmp(argv[0], "verify"))
-		result = cmd_bundle_verify(argc, argv, prefix);
-	else if (!strcmp(argv[0], "list-heads"))
-		result = cmd_bundle_list_heads(argc, argv, prefix);
-	else if (!strcmp(argv[0], "unbundle"))
-		result = cmd_bundle_unbundle(argc, argv, prefix);
-	else {
-		error(_("Unknown subcommand: %s"), argv[0]);
-		usage_with_options(builtin_bundle_usage, options);
-	}
-	return result ? 1 : 0;
+	return !!fn(argc, argv, prefix);
 }