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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 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-34)
+ #:use-module (srfi srfi-35)
+ #:export (run-keymap-page))
+
+(define (run-layout-page layouts layout->text)
+ (let ((title (G_ "Layout selection")))
+ (run-listbox-selection-page
+ #:title title
+ #:info-text (G_ "Please choose your keyboard layout.")
+ #:listbox-items layouts
+ #:listbox-item->text layout->text
+ #:button-text (G_ "Cancel")
+ #:button-callback-procedure
+ (lambda _
+ (raise
+ (condition
+ (&installer-step-abort)))))))
+
+(define (run-variant-page variants variant->text)
+ (let ((title (G_ "Variant selection")))
+ (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
+ #:button-text (G_ "Back")
+ #:button-callback-procedure
+ (lambda _
+ (raise
+ (condition
+ (&installer-step-abort)))))))
+
+(define (run-model-page models model->text)
+ (let ((title (G_ "Keyboard model selection")))
+ (run-listbox-selection-page
+ #:title title
+ #:info-text (G_ "Please choose your keyboard model.")
+ #:listbox-items models
+ #:listbox-item->text model->text
+ #:listbox-default-item (find (lambda (model)
+ (string=? (x11-keymap-model-name model)
+ "pc105"))
+ models)
+ #:sort-listbox-items? #f
+ #:button-text (G_ "Back")
+ #:button-callback-procedure
+ (lambda _
+ (raise
+ (condition
+ (&installer-step-abort)))))))
+
+(define* (run-keymap-page #:key models layouts)
+ "Run a page asking the user to select a keyboard model, layout and
+variant. MODELS and LAYOUTS are lists of supported X11-KEYMAP-MODEL and
+X11-KEYMAP-LAYOUT. Return a list of three elements, the names of the selected
+keyboard model, layout and variant."
+ (define keymap-steps
+ (list
+ (installer-step
+ (id 'model)
+ (compute
+ (lambda _
+ ;; TODO: Understand why (run-model-page models x11-keymap-model-name)
+ ;; fails with: warning: possibly unbound variable
+ ;; `%x11-keymap-model-description-procedure.
+ (run-model-page models (lambda (model)
+ (x11-keymap-model-description
+ model))))))
+ (installer-step
+ (id 'layout)
+ (compute
+ (lambda _
+ (let* ((layout (run-layout-page
+ layouts
+ (lambda (layout)
+ (x11-keymap-layout-description layout)))))
+ (if (null? (x11-keymap-layout-variants layout))
+ ;; Break if this layout does not have any variant.
+ (raise
+ (condition
+ (&installer-step-break)))
+ layout)))))
+ ;; Propose the user to select a variant among those supported by the
+ ;; previously selected layout.
+ (installer-step
+ (id 'variant)
+ (compute
+ (lambda (result)
+ (let ((variants (x11-keymap-layout-variants
+ (result-step result 'layout))))
+ (run-variant-page variants
+ (lambda (variant)
+ (x11-keymap-variant-description
+ variant)))))))))
+
+ (define (format-result result)
+ (let ((model (x11-keymap-model-name
+ (result-step result 'model)))
+ (layout (x11-keymap-layout-name
+ (result-step result 'layout)))
+ (variant (and=> (result-step result 'variant)
+ (lambda (variant)
+ (x11-keymap-variant-name variant)))))
+ (list model layout (or variant ""))))
+ (format-result
+ (run-installer-steps #:steps keymap-steps)))