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Re: [PATCH 0/5] Make :(attr) pathspec work with "git log"

On Mon, Nov 19, 2018 at 12:16 PM Ævar Arnfjörð Bjarmason
<avarab@xxxxxxxxx> wrote:
> As an aside, how do you do the inverse of matching for an attribute by
> value? I.e.:
>     $ git ls-files | wc -l; git ls-files ':(attr:diff=perl)' | wc -l
>     3522
>     65
> I'd like something gives me all files that don't match diff=perl,
> i.e. 3522-65 = 3457 files, or what I'd get if I constructed such a match
> manually with excludes:
>     $ git ls-files $(grep diff=perl .gitattributes | cut -d ' ' -f1 | sed 's!^!:(exclude)!') | wc -l
>     3457
> From my reading of parse_pathspec_attr_match() and match_attrs() this
> isn't possible and I'd need to support ':(attr:diff!=perl)' via a new
> MATCH_NOT_VALUE mode. But I wanted to make sure I wasn't missing some
> subtlety, i.e. that this was implemented already via some other feature.
> I thought I could do:
>     git ls-files ':(exclude):(attr:diff=perl)'
> But we don't support chaining like that, and this would only exclude a
> file that's actually called ":(attr:diff=perl)". I.e. created via
> something like "touch ':(attr:diff=perl)'".

I think we allow :(exclude,attr:diff=perl) which should "exclude all
paths that have diff=perl attribute". It's actually tested in t6135
for ls-files (but I didn't add the same test for 'git grep' because I
was so confident it would work; I'll work on that).