[PATCH/RFC 1/5] git.c: convert --list-builtins to --list-cmds=builtins

[Nguyễn Thái Ngọc Duy]

Even if this is a hidden option, let's make it a bit more generic
since we're introducing more listing types.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 git.c           | 7 +++++--
 t/t0012-help.sh | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/git.c b/git.c
index ceaa58ef40..f350002260 100644
--- a/git.c
+++ b/git.c
@@ -205,8 +205,11 @@ static int handle_options(const char ***argv, int *argc, 
int *envchanged)
                        }
                        (*argv)++;
                        (*argc)--;
-               } else if (!strcmp(cmd, "--list-builtins")) {
-                       list_builtins();
+               } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) {
+                       if (!strcmp(cmd, "builtins"))
+                               list_builtins();
+                       else
+                               die("unsupported command listing type '%s'", 
cmd);
                        exit(0);
                } else {
                        fprintf(stderr, _("unknown option: %s\n"), cmd);
diff --git a/t/t0012-help.sh b/t/t0012-help.sh
index 487b92a5de..fd2a7f27dc 100755
--- a/t/t0012-help.sh
+++ b/t/t0012-help.sh
@@ -50,7 +50,7 @@ test_expect_success "--help does not work for guides" "
 "
 
 test_expect_success 'generate builtin list' '
-       git --list-builtins >builtins
+       git --list-cmds=builtins >builtins
 '
 
 while read builtin
-- 
2.17.0.rc0.348.gd5a49e0b6f