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Diffstat (limited to 'gnu/installer/keymap.scm')
| -rw-r--r-- | gnu/installer/keymap.scm | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/gnu/installer/keymap.scm b/gnu/installer/keymap.scm new file mode 100644 index 0000000000..d66b376d9c --- /dev/null +++ b/gnu/installer/keymap.scm @@ -0,0 +1,172 @@ +;;; 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)))))) |