[evolution] Add e_mail_store_go_offline_sync().

[Matthew Barnes <mbarnes src gnome org>]

commit dd4d570b628a19e74546fbbbc9ee2c0e6783c9e7
Author: Matthew Barnes <mbarnes redhat com>
Date:   Thu Jul 18 11:23:36 2013 -0400

    Add e_mail_store_go_offline_sync().
    
    Mostly for symmetry with e_mail_store_go_online_sync().

 libemail-engine/e-mail-store-utils.c |   52 +++++++++++++++++++++-------------
 libemail-engine/e-mail-store-utils.h |    3 ++
 2 files changed, 35 insertions(+), 20 deletions(-)
---
diff --git a/libemail-engine/e-mail-store-utils.c b/libemail-engine/e-mail-store-utils.c
index ac8e8ea..cb33af1 100644
--- a/libemail-engine/e-mail-store-utils.c
+++ b/libemail-engine/e-mail-store-utils.c
@@ -160,11 +160,27 @@ mail_store_go_offline_thread (GSimpleAsyncResult *simple,
                               GObject *source_object,
                               GCancellable *cancellable)
 {
+       GError *local_error = NULL;
+
+       e_mail_store_go_offline_sync (
+               CAMEL_STORE (source_object), cancellable, &local_error);
+
+       if (local_error != NULL)
+               g_simple_async_result_take_error (simple, local_error);
+}
+
+gboolean
+e_mail_store_go_offline_sync (CamelStore *store,
+                              GCancellable *cancellable,
+                              GError **error)
+{
        CamelService *service;
        const gchar *display_name;
-       GError *local_error = NULL;
+       gboolean success = TRUE;
 
-       service = CAMEL_SERVICE (source_object);
+       g_return_val_if_fail (CAMEL_IS_STORE (store), FALSE);
+
+       service = CAMEL_SERVICE (store);
 
        display_name = camel_service_get_display_name (service);
        if (display_name == NULL || *display_name == '\0')
@@ -173,36 +189,32 @@ mail_store_go_offline_thread (GSimpleAsyncResult *simple,
        camel_operation_push_message (
                cancellable, _("Disconnecting from '%s'"), display_name);
 
-       if (CAMEL_IS_DISCO_STORE (service)) {
+       if (CAMEL_IS_DISCO_STORE (store)) {
                CamelDiscoStore *disco_store;
 
-               disco_store = CAMEL_DISCO_STORE (service);
+               disco_store = CAMEL_DISCO_STORE (store);
 
                if (camel_disco_store_can_work_offline (disco_store))
-                       camel_disco_store_set_status (
+                       success = camel_disco_store_set_status (
                                disco_store, CAMEL_DISCO_STORE_OFFLINE,
-                               cancellable, &local_error);
+                               cancellable, error);
                else
-                       camel_service_disconnect_sync (
-                               service, TRUE, cancellable, &local_error);
+                       success = camel_service_disconnect_sync (
+                               service, TRUE, cancellable, error);
 
-       } else if (CAMEL_IS_OFFLINE_STORE (service)) {
-               CamelOfflineStore *offline_store;
-
-               offline_store = CAMEL_OFFLINE_STORE (service);
-
-               camel_offline_store_set_online_sync (
-                       offline_store, FALSE, cancellable, &local_error);
+       } else if (CAMEL_IS_OFFLINE_STORE (store)) {
+               success = camel_offline_store_set_online_sync (
+                       CAMEL_OFFLINE_STORE (store),
+                       FALSE, cancellable, error);
 
        } else {
-               camel_service_disconnect_sync (
-                       service, TRUE, cancellable, &local_error);
+               success = camel_service_disconnect_sync (
+                       service, TRUE, cancellable, error);
        }
 
-       if (local_error != NULL)
-               g_simple_async_result_take_error (simple, local_error);
-
        camel_operation_pop_message (cancellable);
+
+       return success;
 }
 
 void
diff --git a/libemail-engine/e-mail-store-utils.h b/libemail-engine/e-mail-store-utils.h
index 143e0cc..dc24316 100644
--- a/libemail-engine/e-mail-store-utils.h
+++ b/libemail-engine/e-mail-store-utils.h
@@ -40,6 +40,9 @@ gboolean      e_mail_store_create_folder_finish
                                                 GAsyncResult *result,
                                                 GError **error);
 
+gboolean       e_mail_store_go_offline_sync    (CamelStore *store,
+                                                GCancellable *cancellable,
+                                                GError **error);
 void           e_mail_store_go_offline         (CamelStore *store,
                                                 gint io_priority,
                                                 GCancellable *cancellable,