home-services: Add fontutils.

* gnu/home-services/fontutils.scm (home-fontconfig-service-type): New
variable.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add home-services/fontutils.scm.

Signed-off-by: Oleg Pykhalov <go.wigust@gmail.com>

gnu/home-services/fontutils.scm

@@ -0,0 +1,65 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
+;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
+;;;
+;;; 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 fontutils)
+  #:use-module (gnu home-services)
+  #:use-module (gnu packages fontutils)
+  #:use-module (guix gexp)
+
+  #:export (home-fontconfig-service-type))
+
+;;; Commentary:
+;;;
+;;; Services related to fonts.  home-fontconfig service provides
+;;; fontconfig configuration, which allows fc-* utilities to find
+;;; fonts in Guix Home's profile and regenerates font cache on
+;;; activation.
+;;;
+;;; Code:
+
+(define (add-fontconfig-config-file he-symlink-path)
+  `(("config/fontconfig/fonts.conf"
+     ,(mixed-text-file
+       "fonts.conf"
+       "<?xml version='1.0'?>
+<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
+<fontconfig>
+  <dir>~/.guix-home/profile/share/fonts</dir>
+</fontconfig>"))))
+
+(define (regenerate-font-cache-gexp _)
+  `(("profile/share/fonts"
+     ,#~(system* #$(file-append fontconfig "/bin/fc-cache") "-fv"))))
+
+(define home-fontconfig-service-type
+  (service-type (name 'home-fontconfig)
+                (extensions
+                 (list (service-extension
+                        home-files-service-type
+                        add-fontconfig-config-file)
+                       (service-extension
+                        home-run-on-change-service-type
+                        regenerate-font-cache-gexp)
+                       (service-extension
+                        home-profile-service-type
+                        (const (list fontconfig)))))
+                (default-value #f)
+                (description
+                 "Provides configuration file for fontconfig and make
+fc-* utilities aware of font packages installed in Guix Home's profile.")))

gnu/local.mk

@@ -75,6 +75,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/ci.scm					\
   %D%/home-services.scm                         \
   %D%/home-services/symlink-manager.scm         \
+  %D%/home-services/fontutils.scm               \
   %D%/image.scm					\
   %D%/packages.scm				\
   %D%/packages/abduco.scm			\