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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 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 parameters)
+ #:use-module (gnu installer proxy)
+ #:use-module (gnu installer steps)
+ #:use-module (gnu installer newt page)
+ #:use-module (guix i18n)
+ #:use-module (ice-9 match)
+ #:use-module (newt)
+ #:export (run-parameters-page))
+
+(define (run-proxy-page)
+ (define proxy
+ (run-input-page (G_ "Please enter the HTTP proxy URL. If you enter an \
+empty string, proxy usage will be disabled.")
+ (G_ "HTTP proxy configuration")
+ #:allow-empty-input? #t))
+ (if (string=? proxy "")
+ (clear-http-proxy)
+ (set-http-proxy proxy)))
+
+(define (run-parameters-page keyboard-layout-selection)
+ "Run a parameters page allowing to change the keyboard layout"
+ (let* ((items
+ (list
+ (cons (G_ "Change keyboard layout") keyboard-layout-selection)
+ (cons (G_ "Configure HTTP proxy") run-proxy-page)))
+ (result
+ (run-listbox-selection-page
+ #:info-text (G_ "Please choose one of the following parameters or \
+press ‘Back’ to go back to the installation process.")
+ #:title (G_ "Installation parameters")
+ #:listbox-items items
+ #:listbox-item->text car
+ #:sort-listbox-items? #f
+ #:listbox-height 6
+ #:button-text (G_ "Back"))))
+ (match result
+ ((_ . proc)
+ (proc))
+ (_ #f))))