[evolution-data-server/openismus-work-master: 30/74] EDataBook: Watch the system bus for locale notifications

[Tristan Van Berkom <tvb src gnome org>]

commit f6118793e3b494a3606de63498eebdd97c00cdba
Author: Tristan Van Berkom <tristanvb openismus com>
Date:   Thu May 23 15:24:09 2013 +0900

    EDataBook: Watch the system bus for locale notifications
    
    When org.freedesktop.locale1 is available, listen to changes in
    the LC_COLLATE locale and configure backends with locale changes
    using e_book_backend_set_locale(), notify property changes via
    the locale property on the addressbook D-Bus API.
    
    Also, load the backend's initially set locale as the locale property
    value until the org.freedesktop.locale1 D-Bus interface notifies
    us of a locale change on the system bus.

 addressbook/libedata-book/e-data-book.c |  199 +++++++++++++++++++++++++++++++
 1 files changed, 199 insertions(+), 0 deletions(-)
---
diff --git a/addressbook/libedata-book/e-data-book.c b/addressbook/libedata-book/e-data-book.c
index c427a23..f27006b 100644
--- a/addressbook/libedata-book/e-data-book.c
+++ b/addressbook/libedata-book/e-data-book.c
@@ -32,6 +32,7 @@
 #include "e-book-backend.h"
 #include "e-book-backend-sexp.h"
 #include "e-book-backend-factory.h"
+#include "e-dbus-localed.h"
 
 #define E_DATA_BOOK_GET_PRIVATE(obj) \
        (G_TYPE_INSTANCE_GET_PRIVATE \
@@ -50,6 +51,10 @@ struct _EDataBookPrivate {
 
        GMutex sender_lock;
        GHashTable *sender_table;
+
+       guint localed_watch_id;
+       EDBusLocale1 *localed_proxy;
+       GCancellable *localed_cancel;
 };
 
 struct _AsyncContext {
@@ -1454,6 +1459,156 @@ e_data_book_report_backend_property_changed (EDataBook *book,
        /* Disregard anything else. */
 }
 
+static gchar *
+data_book_interpret_locale_value (const gchar *value)
+{
+       gchar *interpreted_value = NULL;
+       gchar **split;
+
+       split = g_strsplit (value, "=", 2);
+
+       if (split && split[0] && split[1])
+               interpreted_value = g_strdup (split[1]);
+
+       g_strfreev (split);
+
+       if (!interpreted_value)
+               g_warning ("Failed to interpret locale value: %s", value);
+
+       return interpreted_value;
+}
+
+static gchar *
+data_book_interpret_locale (const gchar * const * locale)
+{
+       gint i;
+       gchar *interpreted_locale = NULL;
+
+       /* Prioritize LC_COLLATE and then LANG values
+        * in the 'locale' specified by localed.
+        *
+        * If localed explicitly specifies no locale, then
+        * default to checking system locale.
+        */
+       if (locale) {
+
+               for (i = 0; locale[i] != NULL && interpreted_locale == NULL; i++) {
+
+                       if (strncmp (locale[i], "LC_COLLATE", 10))
+                               interpreted_locale = data_book_interpret_locale_value (locale[i]);
+               }
+
+               for (i = 0; locale[i] != NULL && interpreted_locale == NULL; i++) {
+
+                       if (strncmp (locale[i], "LANG", 4))
+                               interpreted_locale = data_book_interpret_locale_value (locale[i]);
+               }
+       }
+
+       if (!interpreted_locale) {
+               const gchar *system_locale = setlocale (LC_COLLATE, NULL);
+
+               interpreted_locale = g_strdup (system_locale);
+       }
+
+       return interpreted_locale;
+}
+
+static void
+data_book_locale_changed (GObject *object,
+                         GParamSpec *pspec,
+                         gpointer user_data)
+{
+       EDBusLocale1 *locale_proxy = E_DBUS_LOCALE1 (object);
+       EDataBook *book = (EDataBook *)user_data;
+       EBookBackend *backend;
+
+       backend = e_data_book_ref_backend (book);
+
+       if (backend) {
+               const gchar * const *locale;
+               gchar *interpreted_locale;
+
+               locale = e_dbus_locale1_get_locale (locale_proxy);
+               interpreted_locale = data_book_interpret_locale (locale);
+
+               e_book_backend_set_locale (backend, interpreted_locale);
+
+               e_dbus_address_book_set_locale (book->priv->dbus_interface, interpreted_locale);
+
+               g_free (interpreted_locale);
+       }
+
+       g_object_unref (backend);
+}
+
+static void
+data_book_localed_ready (GObject *source_object,
+                        GAsyncResult *res,
+                        gpointer user_data)
+{
+       EDataBook *book = (EDataBook *)user_data;
+       GError *error = NULL;
+
+       book->priv->localed_proxy = e_dbus_locale1_proxy_new_finish (res, &error);
+
+       if (book->priv->localed_proxy == NULL) {
+               g_warning ("Error fetching localed proxy: %s", error->message);
+               g_error_free (error);
+       }
+
+       if (book->priv->localed_cancel) {
+               g_object_unref (book->priv->localed_cancel);
+               book->priv->localed_cancel = NULL;
+       }
+
+       if (book->priv->localed_proxy) {
+               g_signal_connect (book->priv->localed_proxy, "notify::locale",
+                                 G_CALLBACK (data_book_locale_changed), book);
+
+               /* Initial refresh the locale */
+               data_book_locale_changed (G_OBJECT (book->priv->localed_proxy), NULL, book);
+       }
+}
+
+static void
+data_book_localed_appeared (GDBusConnection *connection,
+                           const gchar *name,
+                           const gchar *name_owner,
+                           gpointer user_data)
+{
+       EDataBook *book = (EDataBook *)user_data;
+
+       book->priv->localed_cancel = g_cancellable_new ();
+
+       e_dbus_locale1_proxy_new (connection,
+                                 G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
+                                 "org.freedesktop.locale1",
+                                 "/org/freedesktop/locale1",
+                                 book->priv->localed_cancel,
+                                 data_book_localed_ready,
+                                 book);
+}
+
+static void
+data_book_localed_vanished (GDBusConnection *connection,
+                           const gchar *name,
+                           gpointer user_data)
+{
+       EDataBook *book = (EDataBook *)user_data;
+
+       if (book->priv->localed_cancel) {
+               g_cancellable_cancel (book->priv->localed_cancel);
+               g_object_unref (book->priv->localed_cancel);
+               book->priv->localed_cancel = NULL;
+       }
+
+       if (book->priv->localed_proxy) {
+               g_object_unref (book->priv->localed_proxy);
+               book->priv->localed_proxy = NULL;
+       }
+}
+
 static void
 data_book_set_backend (EDataBook *book,
                        EBookBackend *backend)
@@ -1569,6 +1724,17 @@ data_book_dispose (GObject *object)
                priv->direct_module = NULL;
        }
 
+       if (priv->localed_cancel) {
+               g_cancellable_cancel (priv->localed_cancel);
+               g_object_unref (priv->localed_cancel);
+               priv->localed_cancel = NULL;
+       }
+
+       if (priv->localed_proxy) {
+               g_object_unref (priv->localed_proxy);
+               priv->localed_proxy = NULL;
+       }
+
        g_hash_table_remove_all (priv->sender_table);
 
        /* Chain up to parent's dispose() metnod. */
@@ -1592,6 +1758,9 @@ data_book_finalize (GObject *object)
                priv->dbus_interface = NULL;
        }
 
+       if (priv->localed_watch_id > 0)
+               g_bus_unwatch_name (priv->localed_watch_id);
+
        /* Chain up to parent's finalize() method. */
        G_OBJECT_CLASS (e_data_book_parent_class)->finalize (object);
 }
@@ -1654,6 +1823,12 @@ data_book_constructed (GObject *object)
                book, prop_name, prop_value);
        g_free (prop_value);
 
+       /* Initialize the locale to the value reported by setlocale() until
+        * systemd says otherwise.
+        */
+       e_dbus_address_book_set_locale (book->priv->dbus_interface,
+                                       setlocale (LC_COLLATE, NULL));
+
        g_object_unref (backend);
 }
 
@@ -1664,6 +1839,8 @@ data_book_initable_init (GInitable *initable,
 {
        EBookBackend *backend;
        EDataBook *book;
+       const gchar *locale;
+       GBusType bus_type = G_BUS_TYPE_SYSTEM;
 
        book = E_DATA_BOOK (initable);
 
@@ -1693,6 +1870,28 @@ data_book_initable_init (GInitable *initable,
                        return FALSE;
        }
 
+       /* Fetch backend configured locale and set that as the initial
+        * value on the dbus object
+        */
+       locale = e_book_backend_get_locale (backend);
+       e_dbus_address_book_set_locale (book->priv->dbus_interface, locale);
+
+       /* When running tests, we pretend to be the "org.freedesktop.locale1" service
+        * on the session bus instead of the real location on the system bus.
+        */
+       if (g_getenv ("EDS_TESTING") != NULL)
+               bus_type = G_BUS_TYPE_SESSION;
+
+       /* Watch system bus for locale change notifications */
+       book->priv->localed_watch_id =
+               g_bus_watch_name (bus_type,
+                                 "org.freedesktop.locale1",
+                                 G_BUS_NAME_WATCHER_FLAGS_NONE,
+                                 data_book_localed_appeared,
+                                 data_book_localed_vanished,
+                                 book,
+                                 NULL);
+
        return g_dbus_interface_skeleton_export (
                G_DBUS_INTERFACE_SKELETON (book->priv->dbus_interface),
                book->priv->connection,