From 762b00327be7a21ac3e04b10610666b0d323104b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20=C3=81ngel=20Arruga=20Vivas?=
 <address@hidden>
Date: Tue, 23 Apr 2019 15:03:58 +0200
Subject: [PATCH 3/3] system: Use locale information in grub.cfg.

* gnu/bootloader/grub.scm (locale-config-entries): New procedure.
(grub-configuration-file): Use locale-config-entries.
---
 gnu/bootloader/grub.scm | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index 446f90157c..81c4e31e28 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -3,6 +3,7 @@
 ;;; Copyright © 2016 Chris Marusich <address@hidden>
 ;;; Copyright © 2017 Leo Famulari <address@hidden>
 ;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
+;;; Copyright © 2019 Miguel Ángel Arruga Vivas <address@hidden>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -28,6 +29,7 @@
   #:use-module (gnu system uuid)
   #:use-module (gnu system file-systems)
   #:use-module (gnu system keyboard)
+  #:use-module (gnu system locale)
   #:autoload   (gnu packages bootloaders) (grub)
   #:autoload   (gnu packages gtk) (guile-cairo guile-rsvg)
   #:autoload   (gnu packages xorg) (xkeyboard-config)
@@ -216,6 +218,36 @@ fi~%"
                  #$(theme-colors grub-theme-color-normal)
                  #$(theme-colors grub-theme-color-highlight))))
 
+(define* (locale-config-entries config store-device store-mount-point
+                                #:key locale port)
+  "Return a gexp that writes to PORT (a port-valued gexp) the
+'grub.cfg' part concerned with locale configuration."
+  ;; FIXME: /boot in a separate partition is not suported.  The prefix must
+  ;; be removed in order to make it work.  GRUB EFI installation contains an
+  ;; usable /boot/efi/grub/locale/ folder too, but it is not used, for the
+  ;; same reason.
+  (define grub-locale-dir "/boot/grub/locale")
+  (define (grub-lang-id)
+    (let ((definition (locale-name->definition locale)))
+      (locale-definition-source definition)))
+  (define (grub-locale-file)
+    (string-append grub-locale-dir "/" (grub-lang-id) ".mo"))
+
+  (and locale
+       #~(format #$port "# Configure GRUB with the selected locale.
+
+# Set the root for the locale file
+~a
+
+if [ -d ~a ]; then
+  set locale_dir=~a
+  set lang=~a
+fi~%"
+                 #$(grub-root-search store-device (grub-locale-file))
+                 #$grub-locale-dir
+                 #$grub-locale-dir
+                 #$(grub-lang-id))))
+
 
 ;;;
 ;;; Configuration file.
@@ -364,6 +396,10 @@ entries corresponding to old generations of the system."
 terminal_input at_keyboard
 insmod keylayouts
 keymap ~a~%" keymap)))))
+  (define locale-config
+    (locale-config-entries config (menu-entry-device (first all-entries))
+                           (menu-entry-device-mount-point (first all-entries))
+                           #:locale locale #:port #~port))
 
   (define builder
     #~(call-with-output-file #$output
@@ -374,6 +410,7 @@ keymap ~a~%" keymap)))))
 ")
           #$sugar
           #$keyboard-layout-config
+          #$locale-config
           (format port "
 set default=~a
 set timeout=~a~%"
-- 
2.21.0