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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
;;; Copyright © 2023 Giacomo Leidi <goodoldpaul@autistici.org>
;;; Copyright © 2023 Andrew Patterson <andrewpatt7@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 fontutils)
#:use-module (gnu home services)
#:use-module (gnu packages fontutils)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:use-module (sxml simple)
#: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 (write-fontconfig-doctype)
"Prints fontconfig's DOCTYPE to current-output-port."
;; This is necessary because SXML doesn't seem to have a way to represent a doctype,
;; but sxml->xml /does/ currently call any thunks in the SXML with the XML output port
;; as current-output-port, allowing the output to include arbitrary text instead of
;; just properly quoted XML.
(format #t "<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>"))
(define (config->sxml config)
"Converts a <home-fontconfig-configuration> record into the SXML representation
of fontconfig's fonts.conf file."
(define (snippets->sxml snippet)
(match snippet
((or (? string? dir)
(? gexp? dir))
`(dir ,dir))
((? list?)
snippet)))
`(*TOP* (*PI* xml "version='1.0'")
,write-fontconfig-doctype
(fontconfig
,@(map snippets->sxml config))))
(define (add-fontconfig-config-file config)
`(("fontconfig/fonts.conf"
,(mixed-text-file
"fonts.conf"
(call-with-output-string
(lambda (port)
(sxml->xml (config->sxml config) port)))))))
(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-xdg-configuration-files-service-type
add-fontconfig-config-file)
(service-extension
home-run-on-change-service-type
regenerate-font-cache-gexp)))
(compose concatenate)
(extend append)
(default-value '("~/.guix-home/profile/share/fonts"))
(description
"Provides configuration file for fontconfig and make
fc-* utilities aware of font packages installed in Guix Home's profile.")))
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