[bug#58652] Creating home-emacs-service-type

[Zain Jabbar <zaijab2000@gmail.com>]

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Aloha Guix Development Team,

First submission of a patch to this mail service. Hopefully this
works. I welcome any and all feedback.

Attached is a patch which creates a new file
=/gnu/home/services/emacs.scm= which defines a new service
=home-emacs-service-type= and a configuration for said service
=home-emacs-configuration=. The configuration contains a list of
packages to add to the home-profile, and a list of expressions to add
into Emacs' =init.el= and =early-init.el=.

Here is an example of a home environment file which:

Adds the following packages:
- =bash=
- =emacs-next=
- =emacs-debbugs=
- =emacs-evil=
- =emacs-paredit=
- =emacs-anzu=

Overwrites the =.config/emacs/init.el= with:
#+BEGIN_SRC emacs-lisp
(evil-mode 1)
#+END_SRC

Overwrites the =.config/emacs/early-init.el= with:
#+BEGIN_SRC emacs-lisp
(setq warning-suppress-log-types '((comp) (comp))) (setq
warning-suppress-types '((comp) (comp)))
#+END_SRC

#+BEGIN_SRC scheme
(use-modules (gnu home services emacs)
     (gnu home)
     (gnu packages)
     (ice-9 pretty-print)
     (gnu services))

(define-public minimal-home-environment
  (home-environment
   (services
    (list
     (service home-emacs-service-type
      (home-emacs-configuration
       (packages
(list
(specification->package "bash")
(specification->package "emacs-next")
(specification->package "emacs-debbugs")
(specification->package "emacs-evil")
(specification->package "emacs-paredit")
(specification->package "emacs-anzu")))
       (init '((evil-mode 1)))
       (early-init '((setq warning-suppress-log-types '((comp) (comp)))
     (setq warning-suppress-types '((comp) (comp)))))))))))

minimal-home-environment
#+END_SRC

Saving this text into a file =minimal-working-example.scm= allows us
to run this configuration with =guix home -N --share=/tmp container
./minimal-working-example.scm=.

-- 
Mahalo,
Zain Jabbar

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diff --git a/gnu/home/services/emacs.scm b/gnu/home/services/emacs.scm
deleted file mode 100644
index a3951c2a85..0000000000
--- a/gnu/home/services/emacs.scm
+++ /dev/null
@@ -1,63 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2022 Zain Jabbar <zaijab2000@gmail.com>
-;;;
-;;; This file is part of GNU Guix.
-;;;
-;;; GNU Guix is free software; you can redistribute it and/or modify it
-;;; under the terms of the GNU General Public License as published by
-;;; the Free Software Foundation; either version 3 of the License, or (at
-;;; your option) any later version.
-;;;
-;;; GNU Guix is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;;; GNU General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
-
-(define-module (gnu home services emacs)
-  #:use-module (gnu home)
-  #:use-module (gnu packages)
-  #:use-module (gnu services)
-  #:use-module (gnu home services)
-  #:use-module (gnu services)
-  #:use-module (gnu services configuration)
-  #:use-module (guix gexp)
-
-  #:export (home-emacs-service-type
-	    home-emacs-configuration))
-
-(define file-likes? (list-of file-like?))
-
-(define-configuration/no-serialization home-emacs-configuration
-  (packages
-   (file-likes (list (specification->package "emacs")))
-   "The packages this configuration will add to home-profile. Usually these will be emacs-* packages.")
-  (early-init
-   (list '())
-   "A list whose contents will inserted into @file{$XDG_CONFIG_HOME/emacs/early-init.el}")
-  (init
-   (list '())
-   "A list whose contents will inserted into @file{$XDG_CONFIG_HOME/emacs/init.el}"))
-
-(define home-emacs-service-type
-  (service-type (name 'emacs-configuration)
-		(extensions
-		 (list (service-extension
-			home-profile-service-type
-			(lambda (config) (home-emacs-configuration-packages config)))
-		       (service-extension
-			home-xdg-configuration-files-service-type
-			(lambda (config)
-			  (list
-                           `("emacs/early-init.el"
-			     ,(scheme-file "early-init.el"
-					   (home-emacs-configuration-early-init config)
-					   #:splice? #:t))
-			   `("emacs/init.el"
-			     ,(scheme-file "init.el"
-					   (home-emacs-configuration-init config)
-					   #:splice? #:t)))))))
-		(default-value (home-emacs-configuration))
-		(description "Configures Emacs and installs packages to home-profile.")))