Re: [PATCH v4 4/6] grep: optionally recurse into submodules

[Junio C Hamano <gitster@pobox.com>]

Brandon Williams <bmwill@google.com> writes:

> @@ -300,6 +311,10 @@ static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
>  	if (opt->relative && opt->prefix_length) {
>  		quote_path_relative(filename + tree_name_len, opt->prefix, &pathbuf);
>  		strbuf_insert(&pathbuf, 0, filename, tree_name_len);
> +	} else if (super_prefix) {
> +		strbuf_add(&pathbuf, filename, tree_name_len);
> +		strbuf_addstr(&pathbuf, super_prefix);
> +		strbuf_addstr(&pathbuf, filename + tree_name_len);
>  	} else {
>  		strbuf_addstr(&pathbuf, filename);
>  	}
> @@ -328,10 +343,13 @@ static int grep_file(struct grep_opt *opt, const char *filename)
>  {
>  	struct strbuf buf = STRBUF_INIT;
>  
> -	if (opt->relative && opt->prefix_length)
> +	if (opt->relative && opt->prefix_length) {
>  		quote_path_relative(filename, opt->prefix, &buf);
> -	else
> +	} else {
> +		if (super_prefix)
> +			strbuf_addstr(&buf, super_prefix);
>  		strbuf_addstr(&buf, filename);
> +	}

The above two hunks both assume that the super_prefix option is
usable only from the top-level (i.e. opt->prefix_length == 0) and
also "--no-full-name" (which is the default) cannot be used.  The
only invoker that runs "grep" with "--super-prefix" is the "grep"
that runs in the superproject, and it will only run us from the
top-level of the working tree, so the former assumption is OK.  

It is a bit unclear to me how the "relative" and "--recurse-submodules"
would interact with each other, though.