From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: G expressions
Date: Mon, 28 Apr 2014 09:43:16 +0200
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In-Reply-To: <871twneldl.fsf@gnu.org> ("Ludovic
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	\=\?utf-8\?Q\?s\?\= message of "Thu, 24 Apr 2014 00:23:02 +0200")
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To: guix-devel@gnu.org

Hello!

I=E2=80=99ve been experimenting with gexps in all the contexts with it seem=
ed
=E2=80=9Cobviously=E2=80=9D useful and in some other places under gnu/{syst=
em,services}
(see the commits that say =E2=80=9CRewrite using gexps=E2=80=9D in wip-gexp=
.)

It=E2=80=99s pretty cool: these patches remove ~200 lines (more than 5% of =
the
code in those directories!), and the resulting code is much more
readable IMO, and less error-prone.

For instance, the =E2=80=98inputs=E2=80=99 field of service definitions (in=
fo "(guix)
Defining Services") is no longer needed; instead we just use a gexp for
the start and stop expressions, and that carries all the necessary
dependency info.

I=E2=80=99ll write documentation and merge it real soon now.

Ludo=E2=80=99.