From f4de54246a677ccc77a9f1efc871beaebe1bec40 Mon Sep 17 00:00:00 2001
From: Konrad Bucheli <konrad.bucheli@psi.ch>
Date: Wed, 20 Jul 2022 13:18:23 +0200
Subject: support configuring the keyboard layouts of the ~layout indicator

---
 data/lightdm-gtk-greeter.conf |  3 ++-
 src/greeterconfiguration.h    |  1 +
 src/lightdm-gtk-greeter.c     | 44 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/data/lightdm-gtk-greeter.conf b/data/lightdm-gtk-greeter.conf
index 2a20ef0..5be8343 100644
--- a/data/lightdm-gtk-greeter.conf
+++ b/data/lightdm-gtk-greeter.conf
@@ -32,7 +32,8 @@
 # Panel:
 #  panel-position = top|bottom ("top" by default)
 #  clock-format = strftime-format string, e.g. %H:%M
-#  indicators = semi-colon ";" separated list of allowed indicator modules. Built-in indicators include "~a11y", "~language", "~session", "~power", "~clock", "~host", "~spacer". Unity indicators can be represented by short name (e.g. "sound", "power"), service file name, or absolute path
+#  indicators = semi-colon ";" separated list of allowed indicator modules. Built-in indicators include "~a11y", "~language", "~session", "~power", "~clock", "~host", "~spacer", "~layout". Unity indicators can be represented by short name (e.g. "sound", "power"), service file name, or absolute path
+#  keyboard-layouts = semi-colon ";" separated list keyboard layouts to be listed by the "~layout" indicator (empty by default which provides all available layouts)
 #
 # Accessibility:
 #  a11y-states = states of accessibility features: "name" - save state on exit, "-name" - disabled at start (default value for unlisted), "+name" - enabled at start. Allowed names: contrast, font, keyboard, reader.
diff --git a/src/greeterconfiguration.h b/src/greeterconfiguration.h
index 9e1b452..0d296f4 100644
--- a/src/greeterconfiguration.h
+++ b/src/greeterconfiguration.h
@@ -32,6 +32,7 @@
 #define CONFIG_KEY_ROUND_USER_IMAGE     "round-user-image"
 #define CONFIG_KEY_HIGHLIGHT_LOGGED_USER "highlight-logged-user"
 #define CONFIG_KEY_KEYBOARD             "keyboard"
+#define CONFIG_KEY_KEYBOARD_LAYOUTS     "keyboard-layouts"
 #define CONFIG_KEY_READER               "reader"
 #define CONFIG_KEY_CLOCK_FORMAT         "clock-format"
 #define CONFIG_KEY_ACTIVE_MONITOR       "active-monitor"
diff --git a/src/lightdm-gtk-greeter.c b/src/lightdm-gtk-greeter.c
index 0504ea0..9d59b00 100644
--- a/src/lightdm-gtk-greeter.c
+++ b/src/lightdm-gtk-greeter.c
@@ -1755,6 +1755,13 @@ layout_selected_cb (GtkCheckMenuItem *menuitem, gpointer user_data)
 static void
 update_layouts_menu (void)
 {
+    gchar **layouts;
+    gsize num_layouts = 0;
+
+    layouts = config_get_string_list (NULL, CONFIG_KEY_KEYBOARD_LAYOUTS, NULL);
+    if (layouts)
+        num_layouts = g_strv_length (layouts);
+
     #ifdef HAVE_LIBXKLAVIER
     XklConfigRegistry *registry;
     XklConfigRec *config;
@@ -1783,6 +1790,23 @@ update_layouts_menu (void)
         const gchar *variant = config->variants[i] ? config->variants[i] : "";
         gchar *label = strlen (variant) > 0 ? g_strdup_printf ("%s_%s", layout, variant) : g_strdup (layout);
 
+        /* is the keyboard layout part of keyboard-layouts? */
+        if (num_layouts) {
+            gboolean layout_in_config = FALSE;
+            for (gint j = 0; j < num_layouts; ++j)
+            {
+                if (g_strcmp0 (layouts[j], label) == 0)
+                {
+                    layout_in_config = TRUE;
+                    break;
+                }
+            }
+            if (!layout_in_config) {
+                g_free(label);
+                continue;
+            }
+        }
+
         GtkWidget *menuitem = gtk_radio_menu_item_new (menu_group);
         menu_group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (menuitem));
 
@@ -1819,6 +1843,23 @@ update_layouts_menu (void)
     for (item = lightdm_get_layouts (); item; item = g_list_next (item))
     {
         LightDMLayout *layout = item->data;
+
+        /* is the keyboard layout part of keyboard-layouts? */
+        if (num_layouts) {
+            gboolean layout_in_config = FALSE;
+            for (gint j = 0; j < num_layouts; ++j)
+            {
+                if (g_strcmp0 (layouts[j], lightdm_layout_get_name (layout)) == 0)
+                {
+                    layout_in_config = TRUE;
+                    break;
+                }
+            }
+            if (!layout_in_config) {
+                continue;
+            }
+        }
+
         GtkWidget *menuitem = gtk_radio_menu_item_new (menu_group);
         menu_group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (menuitem));
 
@@ -1833,6 +1874,9 @@ update_layouts_menu (void)
         gtk_widget_show (GTK_WIDGET (menuitem));
     }
     #endif
+
+    if (layouts)
+        g_strfreev (layouts);
 }
 
 static void
-- 
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