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Subject: [bug#39258] [PATCH v2 0/3] Xapian for Guix package search
Resent-Message-ID: <handler.39258.B39258.158373974714601@debbugs.gnu.org>
From: Pierre Neidhardt <mail@ambrevar.xyz>
In-Reply-To: <cu7imjed22r.fsf@systemreboot.net>
References: <20200307133116.11443-1-arunisaac@systemreboot.net>
 <87sgijgb1v.fsf@gnu.org> <cu7tv2zcj9l.fsf@systemreboot.net>
 <875zffcc87.fsf@gnu.org> <cu7imjed22r.fsf@systemreboot.net>
Date: Mon, 09 Mar 2020 08:42:17 +0100
Message-ID: <87a74qvusm.fsf@ambrevar.xyz>
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To: Arun Isaac <arunisaac@systemreboot.net>, Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: 39258@debbugs.gnu.org, zimon.toutoune@gmail.com

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Arun Isaac <arunisaac@systemreboot.net> writes:

>> I=E2=80=99m not sufficiently familiar with Xapian=E2=80=99s query langua=
ge.  The
>> examples I had in mind were:
>> It=E2=80=99s not so much about regexps than it is about selecting indivi=
dual
>> fields.
>
> I have totally not tested this, but I imagine that equivalent Xapian
> queries might look something like:
>
>>   guix search | recsel -p name -e 'license ~ "LGPL 3"'
>
> guix search license:LGPL3
>
>>   guix search crypto library | \
>>     recsel -e '! (name ~ "^(ghc|perl|python|ruby)")' -p name,synopsis
>
> guix search crypto library AND (NOT ghc) AND (NOT perl) AND (NOT python)
> AND (NOT ruby)

Indeed, if you look at the notmuch-search-terms man page, you'll see
that you can select fields.
In my opinion, the recsel format is fully superseded by Xapian.

=2D-=20
Pierre Neidhardt
https://ambrevar.xyz/

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