156/197: installer: New page to select language.

[Danny Milosavljevic]

dannym pushed a commit to branch wip-installer-2
in repository guix.

commit 1f939fe92bc981692259e7964b2639ce559098ff
Author: John Darrington <address@hidden>
Date:   Mon Jan 30 20:27:14 2017 +0100

    installer: New page to select language.
    
    * gnu/system/installer/locale.scm: New module.
    * gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
    * gnu/system/installer/guixsd-installer.scm (base-page-key-handler): Launch 
new page
    on f9.
---
 gnu/local.mk                              |   1 +
 gnu/system/installer/guixsd-installer.scm |   5 +-
 gnu/system/installer/locale.scm           | 137 ++++++++++++++++++++++++++++++
 3 files changed, 141 insertions(+), 2 deletions(-)

diff --git a/gnu/local.mk b/gnu/local.mk
index 39a1a96..0cf29d7 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -472,6 +472,7 @@ GNU_SYSTEM_MODULES =                                \
   %D%/system/installer/guixsd-installer.scm     \
   %D%/system/installer/disks.scm                \
   %D%/system/installer/format.scm               \
+  %D%/system/installer/locale.scm               \
   %D%/system/installer/ping.scm                 \
   %D%/system/installer/key-map.scm              \
   %D%/system/installer/role.scm                 \
diff --git a/gnu/system/installer/guixsd-installer.scm 
b/gnu/system/installer/guixsd-installer.scm
index 3674944..b2af6cb 100644
--- a/gnu/system/installer/guixsd-installer.scm
+++ b/gnu/system/installer/guixsd-installer.scm
@@ -28,6 +28,7 @@
             (gnu system installer configure)
              (gnu system installer filesystems)
             (gnu system installer hostname)
+             (gnu system installer locale)
             (gnu system installer key-map)
             (gnu system installer time-zone)
              (gnu system installer role)
@@ -164,8 +165,8 @@
        (system* "bash" "--rcfile" file-name))))
 
    ((eqv? ch (key-f 9))
-    (setlocale LC_ALL "de_DE.UTF-8")
-    )
+    (let ((p (make-locale-page page (gettext "Change locale"))))
+      (page-enter p)))
 
    ((eqv? ch (key-f 10))
     (match (which "loadkeys")
diff --git a/gnu/system/installer/locale.scm b/gnu/system/installer/locale.scm
new file mode 100644
index 0000000..08de543
--- /dev/null
+++ b/gnu/system/installer/locale.scm
@@ -0,0 +1,137 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 John Darrington <address@hidden>
+;;;
+;;; 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 system installer locale)
+  #:use-module (gnu system installer page)
+  #:use-module (gnu system installer misc)
+  #:use-module (gnu system installer utils)
+  #:use-module (gnu system locale)
+  #:use-module (gurses menu)
+  #:use-module (gurses buttons)
+  #:use-module (ncurses curses)
+  #:use-module (ice-9 format)
+  #:export (make-locale-page))
+
+(include "i18n.scm")
+
+(define my-buttons `((cancel ,(M_ "Canc_el") #t)))
+
+(define (make-locale-page parent  title)
+  (make-page (page-surface parent)
+            title
+            locale-page-refresh
+             0
+            locale-page-key-handler))
+
+(define (locale-page-refresh page)
+    (when (not (page-initialised? page))
+      (locale-page-init page)
+      (page-set-initialised! page #t))
+
+    (let ((win (page-datum page 'text-window))
+         (menu (page-datum page 'menu)))
+      (clear win)
+      (addstr win
+             (justify* (gettext "The following languages are available.")
+                       (getmaxx win)))
+
+      (touchwin (outer (page-wwin page)))
+      (refresh* (outer (page-wwin page)))
+      (refresh* (inner (page-wwin page)))
+      (menu-redraw menu)
+      (menu-refresh menu)))
+
+(define (locale-page-key-handler page ch)
+  (let ((menu (page-datum page 'menu))
+       (nav  (page-datum page 'navigation)))
+
+    (cond
+     ((eq? ch KEY_RIGHT)
+      (menu-set-active! menu #f)
+      (buttons-select-next nav))
+
+     ((eq? ch #\tab)
+      (cond
+       ((menu-active menu)
+         (menu-set-active! menu #f)
+         (buttons-select nav 0))
+
+       ((eqv? (buttons-selected nav) (1- (buttons-n-buttons nav)))
+       (menu-set-active! menu #t)
+       (buttons-unselect-all nav))
+
+       (else
+       (buttons-select-next nav))))
+
+     ((eq? ch KEY_LEFT)
+      (menu-set-active! menu #f)
+      (buttons-select-prev nav))
+
+     ((eq? ch KEY_UP)
+      (buttons-unselect-all nav)
+      (menu-set-active! menu #t))
+
+     ((and (eq? ch #\newline)
+          (menu-active menu))
+      (let ((locale (menu-get-current-item menu)))
+        (setlocale LC_ALL (locale-definition-name locale))
+        (page-leave)))
+
+     ((buttons-key-matches-symbol? nav ch 'cancel)
+      (page-leave)))
+
+    (std-menu-key-handler menu ch))
+
+  #f
+  )
+
+(define (locale-page-init p)
+  (let* ((s (page-surface p))
+        (frame (make-boxed-window  #f
+             (- (getmaxy s) 4) (- (getmaxx s) 2)
+             2 1
+             #:title (page-title p)))
+        (button-window (derwin (inner frame)
+                      3 (getmaxx (inner frame))
+                      (- (getmaxy (inner frame)) 3) 0
+                         #:panel #f))
+        (buttons (make-buttons my-buttons 1))
+
+        (text-window (derwin (inner frame)
+                             4
+                             (getmaxx (inner frame))
+                             0 0 #:panel #f))
+
+        (menu-window (derwin (inner frame)
+                      (- (getmaxy (inner frame)) 3 (getmaxy text-window))
+                       (getmaxx (inner frame))
+                        (getmaxy text-window) 0 #:panel #f))
+
+        (menu (make-menu %default-locale-definitions
+                          #:disp-proc (lambda (d row)
+                                        (locale-definition-name d)))))
+
+    (push-cursor (page-cursor-visibility p))
+    (page-set-datum! p 'text-window text-window)
+    (page-set-wwin! p frame)
+    (page-set-datum! p 'menu menu)
+    (page-set-datum! p 'navigation buttons)
+    (menu-post menu menu-window)
+    (buttons-post buttons button-window)
+    (refresh* (outer frame))
+    (refresh* button-window)))