completion: implement and use --list-cmds=main,others

This is part of the effort to break down and provide commands by
category in machine-readable form. This could be helpful later on when
completion script switches to use --list-cmds for selecting
completable commands. It would be much easier for the user to choose
to complete _all_ commands instead of the default selection by passing
different values to --list-cmds in git-completino.bash.

While at there, replace "git help -a" in git-completion.bash with
--list-cmds since it's better suited for this task.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/git.c b/git.c
index 376a59b..10907f7 100644
--- a/git.c
+++ b/git.c
@@ -56,6 +56,10 @@ static int list_cmds(const char *spec)
 
 		if (match_token(spec, len, "builtins"))
 			list_builtins(&list, 0);
+		else if (match_token(spec, len, "main"))
+			list_all_main_cmds(&list);
+		else if (match_token(spec, len, "others"))
+			list_all_other_cmds(&list);
 		else
 			die(_("unsupported command listing type '%s'"), spec);
 		spec += len;