From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 17 Jun 2013 15:53:21 GMT
Subject: Re: [PATCH] name-rev: Allow to omit refs/tags/ part in --refs option when --tags used
Message-ID: <7vehc0hgy6.fsf@alter.siamese.dyndns.org>
In-Reply-To: <7vip1chi50.fsf@alter.siamese.dyndns.org>

Junio C Hamano <gitster@pobox.com> writes:

> Wouldn't it make more sense to see if the given pattern matches a
> tail substring of the ref, instead of using the hardcoded "strip
> refs/heads/, refs/tags or refs/, and then match once" logic?  That
> way, --refs=origin/* can find refs/remotes/origin/master by running
> fnmatch of origin/* against its substrings, i.e.
>
> 	refs/remotes/origin/master
>         remotes/origin/master
>         origin/master
>
> and find that the pattern matches it.
>
> Perhaps it is just the matter of adding something like:
> ...
> and then at the beginning of name_ref() do this:
>
> 	int can_abbreviate_output = data->name_only;
>
> 	if (data->tags_only && prefixcmp(path, "refs/tags/"))
> 		return 0;
> 	if (data->ref_filter) {
>         	switch (subpath_matches(path, data->ref_filter)) {
> 		case -1: /* did not match */
> 			return 0;
> 		default: /* matched subpath */
> 			can_abbreviate_output = 1;
> 			break;
> 		case 0: /* matched fully */
>                 	break;
> 		}
> 	}
>
> The logic before calling name_rev() will be kept as "only decide how
> the output looks like", without mixing the unrelated "decide if we
> want to use it" logic in.

... which may make the "call name_rev with this abbreviated path"
logic look something like this:

	if (o && o->type == OBJ_COMMIT) {
        	if (can_abbreviate_output)
			path = shorten_unambiguous_ref(path, 0);
		else if (!prefixcmp(path, "refs/heads/"))
			path = path + 11;
		else if (data->tags_only
		    && data->name_only
		    && !prefixcmp(path, "refs/tags/"))
			path = path + 10;
		else if (!prefixcmp(path, "refs/"))
			path = path + 5;

		name_rev((struct commit *) o, xstrdup(path), 0, 0, deref);
	}