GNU bug report logs - #36763
`guix search` does unexpected logical and

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From: Ludovic Courtès <ludo <at> gnu.org>
To: zimoun <zimon.toutoune <at> gmail.com>
Cc: 36763 <at> debbugs.gnu.org
Subject: bug#36763: `guix search` does unexpected logical and
Date: Mon, 16 Sep 2019 10:17:31 +0200

Hello!

zimoun <zimon.toutoune <at> gmail.com> skribis:

> On Thu, 25 Jul 2019 at 19:35, Ludovic Courtès <ludo <at> gnu.org> wrote:
>
>>   (fold p (make-list …) metrics)
>>
>> looks a lot like:
>>
>>   (map (lambda (x) (fold p x metrics)) regexps)
>>
>> Well, something like that.  :-)
>
> Second try attached with your advice. :-)

Neat!

> +  (let ((scores (map
> +                 (lambda (regexp)
> +                   (fold
> +                    (lambda (metric relevance)
> +                      (match metric
> +                        ((field . weight)
> +                         (match (field obj)
> +                           (#f  relevance)
> +                           ((? string? str)
> +                            (+ relevance (* (score str regexp) weight)))
> +                           ((lst ...)
> +                            (+ relevance (* weight
> +                                            (apply + (map
> +                                                      (lambda (str)
> +                                                        (score str regexp))
> +                                                      lst)))))))))
> +                    0 metrics))
> +                 regexps)))

For readability, I’d suggest giving a name to one of the two lambdas
above, so you can write, say:

  (map regexp-scores regexps)

where:

  (define (regexp-scores regexp)
    (fold (lambda (metric relevance)
            …)
          …))

Also, could you add a couple of tests (such as the “libb2” example for
“crypto” + “library” you mentioned earlier)?  You can add them to the
existing “package-relevance” test in tests/ui.scm.

Bonus points if you send the patch with ‘git format-patch’ and with a
commit log:

  https://guix.gnu.org/manual/en/html_node/Submitting-Patches.html

Thank you!

Ludo’.

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