From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Beller <sbeller@google.com>
Subject: Re: [PATCH 0/7] submodule groups
Date: Thu, 12 May 2016 08:32:46 -0700
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Cc: Jonathan Nieder <jrnieder@gmail.com>,
	Jens Lehmann <Jens.Lehmann@web.de>,
	"git@vger.kernel.org" <git@vger.kernel.org>,
	Duy Nguyen <pclouds@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
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On Wed, May 11, 2016 at 10:50 PM, Junio C Hamano <gitster@pobox.com> wrote:
>
>     git cmd -- \*.perl \*.pl \*.pm
>
> I've often wondered if it would be a good idea to let attributes
> file to specify "these paths form the group Perl" with something
> like:
>
>     *.pm        group=perl
>     *.pl        group=perl
>     *.perl      group=perl
>     *.h         group=c
>     *.c         group=c
>
> and say
>
>     git cmd -- ':(group=perl)'
>
> instead.

How is that different to the file size example I gave earlier?
You could have a change which includes:

    -    *.pl    group=prolog
    +    *.pl   group=perl

What happens in the diff/log case then (just as a file can pass an
arbitrary file size within that change) ? These file attributes are as
arbitrary as sizes as well as submodule labels or names.