Re: [BUG] completion.commands does not remove multiple commands

[Jeff King <peff@peff.net>]

On Thu, Feb 28, 2019 at 05:31:23PM -0500, Todd Zullinger wrote:

> Hi,
> 
> I was playing with the completion.commands config added in
> 6532f3740b ("completion: allow to customize the completable
> command list", 2018-05-20) and noticed an issue removing
> multiple commands.
> 
> I wanted to remove completion for cherry and mergetool, so I
> added them both to the config:
> 
>     git config completion.commands "-cherry -mergetool"
> 
> But git still completes cherry in this case, only removing
> mergetool.  Swapping the items in the config yields the
> opposite result (cherry is removed and mergetool is not).

I can reproduce your problem, though the test you included passes for me
even with the current tip of master. I suspect this is the problem:

diff --git a/help.c b/help.c
index 520c9080e8..026f881715 100644
--- a/help.c
+++ b/help.c
@@ -393,8 +393,8 @@ void list_cmds_by_config(struct string_list *list)
 		const char *p = strchrnul(cmd_list, ' ');
 
 		strbuf_add(&sb, cmd_list, p - cmd_list);
-		if (*cmd_list == '-')
-			string_list_remove(list, cmd_list + 1, 0);
+		if (sb.buf[0] == '-')
+			string_list_remove(list, sb.buf + 1, 0);
 		else
 			string_list_insert(list, sb.buf);
 		strbuf_release(&sb);

though I can't help but wonder if the whole thing would be simpler using
string_list_split().

-Peff