calendar-server: Use the actual recurrence ID of events

Instead of querying the client for a list of objects and using
e_cal_recur_generate_instances() to get occurrences for each of
them, we can use e_cal_client_generate_instances_sync() which
combines the functionality of both functions. This doesn't only
save us some lines of code (yay!), but also gives us access to
the real recurrence ID of an event, so we can get rid of the hack
of faking one.

https://bugzilla.gnome.org/show_bug.cgi?id=748226

src/calendar-server/gnome-shell-calendar-server.c

@@ -95,6 +95,12 @@ typedef struct
   GSList *occurrences;
 } CalendarAppointment;
 
+typedef struct
+{
+  ECalClient *client;
+  GHashTable *appointments;
+} CollectAppointmentsData;
+
 static time_t
 get_time_from_property (icalcomponent         *ical,
                         icalproperty_kind      prop_kind,
@@ -396,67 +402,6 @@ resolve_timezone_id (const char *tzid,
   return retval;
 }
 
-static gboolean
-calendar_appointment_collect_occurrence (ECalComponent  *component,
-                                         time_t          occurrence_start,
-                                         time_t          occurrence_end,
-                                         gpointer        data)
-{
-  CalendarOccurrence *occurrence;
-  GSList **collect_loc = data;
-  char *rid;
-
-  /* HACK: component is the primary event, so we don't have access
-   *       to the actual recur ID; fake one if the event has any
-   *       recurrences
-   */
-  if (e_cal_component_has_recurrences (component))
-    rid = ctime (&occurrence_start);
-  else
-    rid = "";
-
-  occurrence             = g_new0 (CalendarOccurrence, 1);
-  occurrence->start_time = occurrence_start;
-  occurrence->end_time   = occurrence_end;
-  occurrence->rid        = g_strdup (rid);
-
-  *collect_loc = g_slist_prepend (*collect_loc, occurrence);
-
-  return TRUE;
-}
-
-static void
-calendar_appointment_generate_occurrences (CalendarAppointment *appointment,
-                                           icalcomponent       *ical,
-                                           ECalClient          *cal,
-                                           time_t               start,
-                                           time_t               end)
-{
-  ECalComponent *ecal;
-  icaltimezone *default_zone;
-
-  g_assert (appointment->occurrences == NULL);
-
-  default_zone = e_cal_client_get_default_timezone (cal);
-
-  ecal = e_cal_component_new ();
-  e_cal_component_set_icalcomponent (ecal,
-                                     icalcomponent_new_clone (ical));
-
-  e_cal_recur_generate_instances (ecal,
-                                  start,
-                                  end,
-                                  calendar_appointment_collect_occurrence,
-                                  &appointment->occurrences,
-                                  (ECalRecurResolveTimezoneFn) resolve_timezone_id,
-                                  cal,
-                                  default_zone);
-
-  g_object_unref (ecal);
-
-  appointment->occurrences = g_slist_reverse (appointment->occurrences);
-}
-
 static CalendarAppointment *
 calendar_appointment_new (icalcomponent        *ical,
                           ECalClient           *cal)
@@ -469,6 +414,38 @@ calendar_appointment_new (icalcomponent        *ical,
   return appointment;
 }
 
+static gboolean
+generate_instances_cb (ECalComponent *comp,
+                       time_t         start,
+                       time_t         end,
+                       gpointer       data)
+{
+  ECalClient *cal = ((CollectAppointmentsData *)data)->client;
+  GHashTable *appointments = ((CollectAppointmentsData *)data)->appointments;
+  CalendarAppointment *appointment;
+  CalendarOccurrence *occurrence;
+  const char *uid;
+
+  e_cal_component_get_uid (comp, &uid);
+  appointment = g_hash_table_lookup (appointments, uid);
+
+  if (appointment == NULL)
+    {
+      icalcomponent *ical = e_cal_component_get_icalcomponent (comp);
+
+      appointment = calendar_appointment_new (ical, cal);
+      g_hash_table_insert (appointments, g_strdup (uid), appointment);
+    }
+
+  occurrence             = g_new0 (CalendarOccurrence, 1);
+  occurrence->start_time = start;
+  occurrence->end_time   = end;
+  occurrence->rid        = e_cal_component_get_recurid_as_string (comp);
+
+  appointment->occurrences = g_slist_append (appointment->occurrences, occurrence);
+}
+
+
 /* ---------------------------------------------------------------------------------------------------- */
 
 struct _App
@@ -647,6 +624,7 @@ app_load_events (App *app)
       GError *error;
       GSList *objects, *j;
       ECalClientView *view;
+      CollectAppointmentsData data;
 
       e_cal_client_set_default_timezone (cal, app->zone);
 
@@ -660,37 +638,13 @@ app_load_events (App *app)
           continue;
         }
 
-      error = NULL;
+      data.client = cal;
-      objects = NULL;
+      data.appointments = app->appointments;
-      if (!e_cal_client_get_object_list_sync (cal,
+      e_cal_client_generate_instances_sync (cal,
-					      query,
-					      &objects,
-					      NULL, /* cancellable */
-					      &error))
-        {
-          ESource *source = e_client_get_source (E_CLIENT (cal));
-          g_warning ("Error querying calendar %s: %s\n",
-		     e_source_get_uid (source), error->message);
-          g_error_free (error);
-          g_free (query);
-          continue;
-        }
-
-      for (j = objects; j != NULL; j = j->next)
-        {
-          icalcomponent *ical = j->data;
-          CalendarAppointment *appointment;
-
-          appointment = calendar_appointment_new (ical, cal);
-          calendar_appointment_generate_occurrences (appointment,
-                                                     ical,
-                                                     cal,
                                             app->since,
-                                                     app->until);
+                                            app->until,
-          g_hash_table_insert (app->appointments, g_strdup (appointment->uid), appointment);
+                                            generate_instances_cb,
-        }
+                                            &data);
-
-      e_cal_client_free_icalcomp_slist (objects);
 
       error = NULL;
       if (!e_cal_client_get_view_sync (cal,
@@ -922,7 +876,7 @@ handle_method_call (GDBusConnection       *connection,
                   char *id = g_strdup_printf ("%s\n%s\n%s",
                                               a->source_id,
                                               a->uid,
-                                              o->rid);
+                                              o->rid ? o->rid : "");
 
                   g_variant_builder_init (&extras_builder, G_VARIANT_TYPE ("a{sv}"));
                   g_variant_builder_add (&builder,