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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)))