Re: Howto run guix.el correctly?

[Alex Kost <alezost@gmail.com>]

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Ludovic Courtès (2014-11-24 23:42 +0300) wrote:

> Alex Kost <alezost@gmail.com> skribis:
>
>> No need to fiddle with ‘geiser-scheme-dir’: it should be set properly if
>> you have ‘(require 'geiser-install)’ in your emacs config.
>
> Oops, indeed, PEBKAC: I was just unaware of ‘geiser-install’, and
> everything was fine when I used Geiser from ELPA because that happens
> automagically.

Yes, that's the point: if you install Emacs packages using the Emacs
package system, everything should work out of the box.  If a package is
installed manually or with some distro's package manager, a user needs
to figure out what he should put in his config to "complete" the
installation.

> It would be nice if guix.el somehow had that works-out-of-the-box
> property when installing Emacs extensions.  :-)

As I wrote at
<http://lists.gnu.org/archive/html/guix-devel/2014-08/msg00165.html>, I
see the only way to achieve that:

- to modify emacs package recipes so that they will provide some files
  with all required initial configuration (and to name such file
  "…-autoloads.el", for example);

- to modify “guix-init.el” so that (require 'guix-init) will load those
  autoloads files;

- to write some elisp code for auto-loading "…-autoloads.el" on the fly
  — i.e., to make it possible to install an Emacs package using
  "guix.el" and to use "M-x <package-command>" immediately.

So if it's acceptable, what about modifying the current recipes
step-by-step.  With geiser it's easy: as "geiser-install.el" provides
all required setup (including autoloads for "M-x …" commands),
"geiser-autoloads.el" may just be a symlink to "geiser-install.el".  I'm
attaching the patch for that.

I'm going to send patch(es) for the elisp code later.


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From 49faffe688c53e9d9197ac9e07511ba0de501840 Mon Sep 17 00:00:00 2001
From: Alex Kost <alezost@gmail.com>
Date: Tue, 25 Nov 2014 16:50:11 +0300
Subject: [PATCH] gnu: emacs: Add "geiser-autoloads.el".

* gnu/packages/emacs.scm (geiser): Add 'post-install' phase for creating
  "geiser-autoloads.el".
---
 gnu/packages/emacs.scm | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gnu/packages/emacs.scm b/gnu/packages/emacs.scm
index 119c613..bde707d 100644
--- a/gnu/packages/emacs.scm
+++ b/gnu/packages/emacs.scm
@@ -135,6 +135,15 @@ editor (without an X toolkit)" )
              (sha256
               (base32 "1mrk0bzqcpfhsw6635qznn47nzfy9ps7wrhkpymswdfpw5mdsry5"))))
     (build-system gnu-build-system)
+    (arguments
+     '(#:phases (alist-cons-after
+                 'install 'post-install
+                 (lambda* (#:key outputs #:allow-other-keys)
+                   (symlink "geiser-install.el"
+                            (string-append (assoc-ref outputs "out")
+                                           "/share/emacs/site-lisp/"
+                                           "geiser-autoloads.el")))
+                 %standard-phases)))
     (inputs `(("guile" ,guile-2.0)
               ("emacs" ,emacs)))
     (home-page "http://nongnu.org/geiser/")
-- 
2.1.3