;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;; 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 newt keymap)
  #:use-module (gnu installer keymap)
  #:use-module (gnu installer steps)
  #:use-module (gnu installer newt page)
  #:use-module (guix i18n)
  #:use-module (guix records)
  #:use-module (newt)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:use-module (ice-9 i18n)
  #:use-module (ice-9 match)
  #:export (run-keymap-page
            keyboard-layout->configuration))

(define (run-layout-page layouts layout->text context)
  (let ((title (G_ "Layout")))
    (run-listbox-selection-page
     #:title title
     #:info-text
     (case context
       ((param) (G_ "Please choose your keyboard layout. \
It will only be used during the installation process. \
Non-Latin layouts can be toggled with Alt+Shift."))
       (else (G_ "Please choose your keyboard layout. \
It will be used during the install process, and for the installed system. \
Non-Latin layouts can be toggled with Alt+Shift. You can switch to a \
different layout at any time from the parameters menu.")))
     #:listbox-items layouts
     #:listbox-item->text layout->text
     #:sort-listbox-items? #f
     #:button-text
     (case context
       ((param) (G_ "Continue"))
       (else (G_ "Exit")))
     #:button-callback-procedure
     (case context
       ((param) (const #f))
       (else
        (lambda _
          (abort-to-prompt 'installer-step 'abort)))))))

(define (run-variant-page variants variant->text)
  (let ((title (G_ "Variant")))
    (run-listbox-selection-page
     #:title title
     #:info-text (G_ "Please choose a variant for your keyboard layout.")
     #:listbox-items variants
     #:listbox-item->text variant->text
     #:sort-listbox-items? #f
     #:button-text (G_ "Back")
     #:button-callback-procedure
     (lambda _
       (abort-to-prompt 'installer-step 'abort)))))

(define (sort-layouts layouts)
  "Sort LAYOUTS list by putting the US layout ahead and return it."
  (define (layout<? layout1 layout2)
    (let ((text1 (x11-keymap-layout-description layout1))
          (text2 (x11-keymap-layout-description layout2)))
      ;; XXX: We're calling 'gettext' more than once per item.
      (string-locale<? (gettext text1 "xkeyboard-config")
                       (gettext text2 "xkeyboard-config"))))

  (define preferred
    ;; Two-letter language tag for the preferred keyboard layout.
    (or (getenv "LANGUAGE") "us"))

  (call-with-values
      (lambda ()
        (partition
         (lambda (layout)