completion: allow to customize the completable command list

By default we show porcelain, external commands and a couple others
that are also popular. If you are not happy with this list, you can
now customize it a new config variable.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/git.c b/git.c
index 63acd9e..447dac0 100644
--- a/git.c
+++ b/git.c
@@ -77,6 +77,8 @@ static int list_cmds(const char *spec)
 			exclude_helpers_from_list(&list);
 		else if (match_token(spec, len, "alias"))
 			list_aliases(&list);
+		else if (match_token(spec, len, "config"))
+			list_cmds_by_config(&list);
 		else if (len > 5 && !strncmp(spec, "list-", 5)) {
 			struct strbuf sb = STRBUF_INIT;