git: add hidden --list-builtins option

It can be useful in the test suite to be able to iterate
over the list of builtins. We could do this with some
Makefile magic. But since the authoritative list is in the
commands array inside git.c, and since this could also be
handy for debugging, let's add a hidden command-line option
to dump that list.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git.c b/git.c
index 8ff44f081d43176474b267de5451f2c2e88089d0..1b8b7f51a65fa2a8e62d11d7ad99f19e2926977f 100644 (file)
--- a/git.c
+++ b/git.c
@@ -26,6 +26,8 @@ static const char *env_names[] = {
 static char *orig_env[4];
 static int save_restore_env_balance;
 
+static void list_builtins(void);
+
 static void save_env_before_alias(void)
 {
        int i;
@@ -232,6 +234,9 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
                        }
                        (*argv)++;
                        (*argc)--;
+               } else if (!strcmp(cmd, "--list-builtins")) {
+                       list_builtins();
+                       exit(0);
                } else {
                        fprintf(stderr, "Unknown option: %s\n", cmd);
                        usage(git_usage_string);
@@ -529,6 +534,13 @@ int is_builtin(const char *s)
        return !!get_builtin(s);
 }
 
+static void list_builtins(void)
+{
+       int i;
+       for (i = 0; i < ARRAY_SIZE(commands); i++)
+               printf("%s\n", commands[i].cmd);
+}
+
 #ifdef STRIP_EXTENSION
 static void strip_extension(const char **argv)
 {