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Subject: [bug#39258] [PATCH v3 1/3] guix: Generate package metadata cache.
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From: zimoun <zimon.toutoune@gmail.com>
Date: Sun, 26 Apr 2020 11:48:36 +0200
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: Arun Isaac <arunisaac@systemreboot.net>, Pierre Neidhardt <mail@ambrevar.xyz>, 39258@debbugs.gnu.org

On Fri, 24 Apr 2020 at 22:48, Ludovic Court=C3=A8s <ludo@gnu.org> wrote:

> > +  (define (expand-cache package result)
> > +    (cons `#(,(package-name package)
> > +             ,(package-version package)
> > +             ,(delete-duplicates
> > +               (map package-full-name
> > +                    (sort (filter package? (package-direct-inputs pack=
age))
> > +                          package<?)))
> > +             ,(package-outputs package)
> > +             ,(package-supported-systems package)
> > +             ,(package-synopsis package)
> > +             ,(package-description package)
> > +             ,(package-home-page package)
> > +             ,(let ((location (package-location package)))
> > +                (list (location-file location)
> > +                      (location-line location)
> > +                      (location-column location))))
>
> I was wondering if we could omit inputs, which are not that useful.

Agree.


> Note that this is probably the place where we could eventually add the
> computation of an inverted index like zimoun suggested in
> <https://lists.gnu.org/archive/html/guix-devel/2020-01/msg00243.html>.

We should first agree on the extra cost (time) we are ready to pay to
build improvements.
See the lengthy message [1] about only the caching "inverted index"
using the current 'relevance' scoring function.

[1] http://issues.guix.gnu.org/39258#78



Cheers,
simon