From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Reproducible profiles
Date: Sat, 16 May 2015 22:05:05 +0200
Message-ID: <87382wmgpa.fsf@gnu.org>
References: <87pp62iqmn.fsf@fsf.org> <87egmgu609.fsf@gnu.org>
	<87a8x4dabt.fsf@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:44921)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1YtiKm-00025F-Ek
	for guix-devel@gnu.org; Sat, 16 May 2015 16:05:21 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1YtiKh-0008Cm-W6
	for guix-devel@gnu.org; Sat, 16 May 2015 16:05:20 -0400
Received: from fencepost.gnu.org ([2001:4830:134:3::e]:57905)
	by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <ludo@gnu.org>)
	id 1YtiKh-0008Ci-T2
	for guix-devel@gnu.org; Sat, 16 May 2015 16:05:15 -0400
In-Reply-To: <87a8x4dabt.fsf@gmail.com> (=?utf-8?B?IuWui+aWh+atpiIncw==?=
	message of "Sat, 16 May 2015 19:35:18 +0800")
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
To: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@gmail.com>
Cc: guix-devel@gnu.org

=E5=AE=8B=E6=96=87=E6=AD=A6 <iyzsong@gmail.com> skribis:

> And how about use specification instead of package, so I can:
>
>   (manifest
>     (map package-specification->manifest-entry
>          '("emacs"
>            "font-adobe-source-han-sans:cn")))

Sure, with:

  (use-modules (gnu) (guix profiles))

  (define package-specification->manifest-entry
    (compose package->manifest-entry
             specification->package))

The advantage of using package names like this is that it=E2=80=99s less
sensitive to module changes; the disadvantage is that it is not as
precise, particularly if there are several packages matching a given
name.

Ludo=E2=80=99.