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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@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 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>
x11-keymap-model
make-x11-keymap-model
x11-keymap-model?
x11-keymap-model-name
x11-keymap-model-description
<x11-keymap-layout>
x11-keymap-layout
make-x11-keymap-layout
x11-keymap-layout?
x11-keymap-layout-name
x11-keymap-layout-description
x11-keymap-layout-variants
<x11-keymap-variant>
x11-keymap-variant
make-x11-keymap-variant
x11-keymap-variant?
x11-keymap-variant-name
x11-keymap-variant-description
default-keyboard-model
xkb-rules->models+layouts
kmscon-update-keymap))
(define-record-type* <x11-keymap-model>
x11-keymap-model make-x11-keymap-model
x11-keymap-model?
(name x11-keymap-model-name) ;string
(description x11-keymap-model-description)) ;string
(define-record-type* <x11-keymap-layout>
x11-keymap-layout make-x11-keymap-layout
x11-keymap-layout?
(name x11-keymap-layout-name) ;string
(description x11-keymap-layout-description) ;string
(variants x11-keymap-layout-variants)) ;list of <x11-keymap-variant>
(define-record-type* <x11-keymap-variant>
x11-keymap-variant make-x11-keymap-variant
x11-keymap-variant?
(name x11-keymap-variant-name) ;string
(description x11-keymap-variant-description)) ;string
;; Assume all modern keyboards have this model.
(define default-keyboard-model (make-parameter "pc105"))
(define (xkb-rules->models+layouts file)
"Parse FILE and return two values, the list of supported X11-KEYMAP-MODEL
and X11-KEYMAP-LAYOUT records. FILE is an XML file from the X Keyboard
Configuration Database, describing possible XKB configurations."
(define (model m)
(sxml-match m
[(model
(configItem
(name ,name)
(description ,description)
. ,rest))
(x11-keymap-model
(name name)
(description description))]))
(define (variant v)
(sxml-match v
[(variant
;; According to xbd-rules DTD, the definition of a
;; configItem is: <!ELEMENT configItem
;; (name,shortDescription*,description*,vendor?,
;; countryList?,languageList?,hwList?)>
;;
;; shortDescription and description are optional elements
;; but sxml-match does not support default values for
;; elements (only attributes). So to avoid writing as many
;; patterns as existing possibilities, gather all the
;; remaining elements but name in REST-VARIANT.
(configItem
(name ,name)
. ,rest-variant))
(x11-keymap-variant
(name name)
(description (car
(assoc-ref rest-variant 'description))))]))
(define (layout l)
(sxml-match l
[(layout
(configItem
(name ,name)
. ,rest-layout)
(variantList ,[variant -> v] ...))
(x11-keymap-layout
(name name)
(description (car
(assoc-ref rest-layout 'description)))
(variants (list v ...)))]
[(layout
(configItem
(name ,name)
. ,rest-layout))
(x11-keymap-layout
(name name)
(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)
"Update kmscon keymap with the provided MODEL, LAYOUT and VARIANT."
(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 variant)
(put-u8 port 0))))))
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