branch: give a more helpful message on redundant arguments

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/branch.c

@@ -859,7 +859,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 		else if (argc == 1)
 			branch_name = argv[0];
 		else
-			usage_with_options(builtin_branch_usage, options);
+			die(_("cannot edit description of more than one branch"));
 
 		strbuf_addf(&branch_ref, "refs/heads/%s", branch_name);
 		if (!ref_exists(branch_ref.buf)) {
@@ -881,7 +881,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 		else if (argc == 2)
 			rename_branch(argv[0], argv[1], rename > 1);
 		else
-			usage_with_options(builtin_branch_usage, options);
+			die(_("too many branches for a rename operation"));
 	} else if (new_upstream) {
 		struct branch *branch = branch_get(argv[0]);
 

t/t3200-branch.sh

@@ -73,8 +73,8 @@ test_expect_success \
 
 test_expect_success \
     'git branch -m dumps usage' \
-       'test_expect_code 129 git branch -m 2>err &&
-	test_i18ngrep "[Uu]sage: git branch" err'
+       'test_expect_code 128 git branch -m 2>err &&
+	test_i18ngrep "too many branches for a rename operation" err'
 
 test_expect_success \
     'git branch -m m m/m should work' \