;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2020 Florian Pelz <pelzflorian@pelzflorian.de>
;;;
;;; 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 installer keymap)
  #:use-module (guix records)
  #:use-module (sxml match)
  #:use-module (sxml simple)
  #:use-module (ice-9 binary-ports)
  #:use-module (ice-9 ftw)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:export (<x11-keymap-model>
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           (x11-keymap-layout
                  (name name)
                  (synopsis (car
                             (assoc-ref rest-layout 'shortDescription)))
                  (description (car
                                (assoc-ref rest-layout 'description)))
                  (variants '()))]))

  (let ((sxml (call-with-input-file file
                (lambda (port)
                  (xml->sxml port #:trim-whitespace? #t)))))
    (match
        (sxml-match sxml
                    [(*TOP*
                      ,pi
                      (xkbConfigRegistry
                       (@ . ,ignored)
                       (modelList ,[model -> m] ...)
                       (layoutList ,[layout -> l] ...)
                       . ,rest))
                     (list
                      (list m ...)
                      (list l ...))])
      ((models layouts)
       (values models layouts)))))

(define (kmscon-update-keymap model layout variant options)
  "Update kmscon keymap with the provided MODEL, LAYOUT, VARIANT and OPTIONS."
  (and=>
   (getenv "KEYMAP_UPDATE")
   (lambda (keymap-file)
     (unless (file-exists? keymap-file)
       (error "Unable to locate keymap update file"))

     ;; See file gnu/packages/patches/kmscon-runtime-keymap-switch.patch.
     ;; This dirty hack makes possible to update kmscon keymap at runtime by
     ;; writing an X11 keyboard model, layout and variant to a named pipe
     ;; referred by KEYMAP_UPDATE environment variable.
     (call-with-output-file keymap-file
       (lambda (port)
         (format port model)
         (put-u8 port 0)

         (format port layout)
         (put-u8 port 0)

         (format port (or variant ""))
         (put-u8 port 0)

         (format port (or options ""))
         (put-u8 port 0))))))