builtin/help.c: speed up is_git_command() by checking for builtin commands first

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 904fd715f0f27af0ac3694209ba3ffe61f174fa8..5df3837e3102e2f7d432ec11bb4685535bfaa0ac 100644 (file)
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -781,7 +781,7 @@ static int switch_branches(const struct checkout_opts *opts,
        if (!(flag & REF_ISSYMREF))
                old.path = NULL;
 
-       if (old.path && !prefixcmp(old.path, "refs/heads/"))
+       if (old.path && starts_with(old.path, "refs/heads/"))
                old.name = old.path + strlen("refs/heads/");
 
        if (!new->name) {
@@ -816,7 +816,7 @@ static int git_checkout_config(const char *var, const char *value, void *cb)
                return 0;
        }
 
-       if (!prefixcmp(var, "submodule."))
+       if (starts_with(var, "submodule."))
                return parse_submodule_config_option(var, value);
 
        return git_xmerge_config(var, value, NULL);
@@ -1151,9 +1151,9 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
                const char *argv0 = argv[0];
                if (!argc || !strcmp(argv0, "--"))
                        die (_("--track needs a branch name"));
-               if (!prefixcmp(argv0, "refs/"))
+               if (starts_with(argv0, "refs/"))
                        argv0 += 5;
-               if (!prefixcmp(argv0, "remotes/"))
+               if (starts_with(argv0, "remotes/"))
                        argv0 += 8;
                argv0 = strchr(argv0, '/');
                if (!argv0 || !argv0[1])