[evolution-data-server/openismus-work-3-8: 36/116] EDataBook: Watch the system bus for locale notifications

[Tristan Van Berkom <tvb src gnome org>]

commit 2d287ca7d2ab45af28deb1847b9fdcad0626ec71
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 |  191 +++++++++++++++++++++++++++++++
 1 files changed, 191 insertions(+), 0 deletions(-)
---
diff --git a/addressbook/libedata-book/e-data-book.c b/addressbook/libedata-book/e-data-book.c
index 071073f..9a29980 100644
--- a/addressbook/libedata-book/e-data-book.c
+++ b/addressbook/libedata-book/e-data-book.c
@@ -36,6 +36,7 @@
 #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 \
@@ -59,6 +60,10 @@ struct _EDataBookPrivate {
        GMutex open_lock;
        guint32 open_opid;
        GQueue open_queue;
+
+       guint localed_watch_id;
+       EDBusLocale1 *localed_proxy;
+       GCancellable *localed_cancel;
 };
 
 enum {
@@ -1785,6 +1790,154 @@ 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 = book->priv->backend;
+
+       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);
+       }
+}
+
+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)
@@ -1904,6 +2057,17 @@ 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;
+       }
+
        /* Chain up to parent's dispose() metnod. */
        G_OBJECT_CLASS (e_data_book_parent_class)->dispose (object);
 }
@@ -1938,6 +2102,9 @@ data_book_finalize (GObject *object)
        /* This should be empty now, else we leak memory. */
        g_warn_if_fail (g_queue_is_empty (&priv->open_queue));
 
+       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);
 }
@@ -1949,6 +2116,8 @@ data_book_initable_init (GInitable *initable,
 {
        EDataBook *book;
        OperationData *op;
+       const gchar *locale;
+       GBusType bus_type = G_BUS_TYPE_SYSTEM;
 
        book = E_DATA_BOOK (initable);
 
@@ -2051,6 +2220,28 @@ data_book_initable_init (GInitable *initable,
                        op->cancellable, op->d.prop_name);
                op_unref (op);
 
+               /* Fetch backend configured locale and set that as the initial
+                * value on the dbus object
+                */
+               locale = e_book_backend_get_locale (book->priv->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,