[gnome-session] Export locale categories through D-Bus

[Bastien Nocera <hadess src gnome org>]

commit a696ccb00acf6bdcd168c23db2cc4e33bb1455e0
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Oct 10 11:03:04 2012 +0200

    Export locale categories through D-Bus
    
    Add GetLocale() function for System Settings to lookup the value
    of a particular locale setting, such as the session language.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=685863

 gnome-session/gsm-manager.c                |   51 ++++++++++++++++++++++++++++
 gnome-session/gsm-manager.h                |    4 ++
 gnome-session/org.gnome.SessionManager.xml |   18 ++++++++++
 3 files changed, 73 insertions(+), 0 deletions(-)
---
diff --git a/gnome-session/gsm-manager.c b/gnome-session/gsm-manager.c
index 192c81d..3effdbf 100644
--- a/gnome-session/gsm-manager.c
+++ b/gnome-session/gsm-manager.c
@@ -28,6 +28,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <signal.h>
+#include <locale.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
@@ -2799,6 +2800,56 @@ gsm_manager_setenv (GsmManager  *manager,
         return TRUE;
 }
 
+static gboolean
+is_valid_category (int category)
+{
+	int categories[] = {
+		LC_CTYPE,
+		LC_NUMERIC,
+		LC_TIME,
+		LC_COLLATE,
+		LC_MONETARY,
+		LC_MESSAGES,
+		LC_ALL,
+		LC_PAPER,
+		LC_NAME,
+		LC_ADDRESS,
+		LC_TELEPHONE,
+		LC_MEASUREMENT,
+		LC_IDENTIFICATION
+	};
+	guint i;
+
+	for (i = 0; i < G_N_ELEMENTS(categories); i++)
+		if (categories[i] == category)
+			return TRUE;
+
+	return FALSE;
+}
+
+gboolean
+gsm_manager_get_locale (GsmManager  *manager,
+                        int          category,
+                        const char **value,
+                        GError     **error)
+{
+        g_return_val_if_fail (GSM_IS_MANAGER (manager), FALSE);
+
+        if (!is_valid_category (category)) {
+                g_set_error (error,
+                             GSM_MANAGER_ERROR,
+                             GSM_MANAGER_ERROR_INVALID_OPTION,
+                             "GetLocale doesn't support locale category '%d'", category);
+                return FALSE;
+        }
+
+        *value = g_strdup (setlocale (category, NULL));
+        if (*value == NULL)
+                *value = g_strdup ("");
+
+        return TRUE;
+}
+
 gboolean
 gsm_manager_initialization_error (GsmManager  *manager,
                                   const char  *message,
diff --git a/gnome-session/gsm-manager.h b/gnome-session/gsm-manager.h
index 175c0ab..666d1d5 100644
--- a/gnome-session/gsm-manager.h
+++ b/gnome-session/gsm-manager.h
@@ -177,6 +177,10 @@ gboolean            gsm_manager_setenv                         (GsmManager     *
                                                                 const char     *variable,
                                                                 const char     *value,
                                                                 GError        **error);
+gboolean            gsm_manager_get_locale                     (GsmManager     *manager,
+                                                                int             category,
+                                                                const char    **value,
+                                                                GError        **error);
 gboolean            gsm_manager_initialization_error           (GsmManager     *manager,
                                                                 const char     *message,
                                                                 gboolean        fatal,
diff --git a/gnome-session/org.gnome.SessionManager.xml b/gnome-session/org.gnome.SessionManager.xml
index 8ed6bda..d07a488 100644
--- a/gnome-session/org.gnome.SessionManager.xml
+++ b/gnome-session/org.gnome.SessionManager.xml
@@ -23,6 +23,24 @@
       </doc:doc>
     </method>
 
+    <method name="GetLocale">
+      <arg name="category" type="i" direction="in">
+        <doc:doc>
+          <doc:summary>The locale category</doc:summary>
+        </doc:doc>
+      </arg>
+      <arg name="value" type="s" direction="out">
+        <doc:doc>
+          <doc:summary>The value</doc:summary>
+        </doc:doc>
+      </arg>
+      <doc:doc>
+        <doc:description>
+          <doc:para>Reads the current state of the specific locale category.</doc:para>
+        </doc:description>
+      </doc:doc>
+    </method>
+
     <method name="InitializationError">
       <arg name="message" type="s" direction="in">
         <doc:doc>