New files with a simple sequence to migrate the task components from the

2001-01-18  Federico Mena Quintero  <federico@ximian.com>

	* gui/tasks-migrate.[ch]: New files with a simple sequence to
	migrate the task components from the old calendar folder into the
	new tasks folder.

	* gui/component-factory.c (owner_set_cb): Call tasks_migrate()
	once evolution_dir is set.  It sucks to have to do this here.

	* cal-client/cal-client.c (cal_client_get_uids): In the inline
	docs, indicate how to free the return value.
	(cal_opened_cb): Ahem, moved assertion to the right place.  Also,
	ref() and unref() around our own signal emission because we are
	not inside a signal handler, rather a simple callback from the
	listener object; we want to have a chance to clean up even if the
	client is unrefed during the emission.

	* gui/Makefile.am (evolution_calendar_SOURCES): Added
	tasks-migrate.[ch] to the list of sources.

2001-01-17  Federico Mena Quintero  <federico@ximian.com>

	* gui/event-editor.c (init_widgets): Use
	e_calendar_item_set_max_days_sel() instead of setting GTK+ object
	arguments.

	* gui/e-day-view.c (e_day_view_set_cal_client): Oops, we had a
	reversed test for the client being loaded.

	* gui/tag-calendar.c (tag_calendar_by_client): Fixed similarly
	reversed test.

svn path=/trunk/; revision=7622

1 files changed, 304 insertions, 0 deletions

diff --git a/calendar/gui/tasks-migrate.c b/calendar/gui/tasks-migrate.c
new file mode 100644
index 0000000000..885c782a0c
--- /dev/null
+++ b/calendar/gui/tasks-migrate.c
@@ -0,0 +1,304 @@
+/* Evolution calendar - Migrate tasks from the calendar folder to the tasks folder
+ *
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Authors: Federico Mena-Quintero <federico@ximian.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnome.h>
+#include <cal-client/cal-client.h>
+#include "component-factory.h"
+#include "tasks-migrate.h"
+
+
+
+/* Client for the calendar folder */
+static CalClient *calendar_client = NULL;
+
+/* Client for the tasks folder */
+static CalClient *tasks_client = NULL;
+
+/* Whether we have done the migration yet */
+static gboolean migrated = FALSE;
+
+
+
+/* Performs the actual migration process */
+static void
+migrate (void)
+{
+	GList *uids;
+	GList *l;
+	gboolean success;
+	gboolean at_least_one;
+
+	g_assert (calendar_client != NULL);
+	g_assert (tasks_client != NULL);
+	g_assert (cal_client_get_load_state (calendar_client) == CAL_CLIENT_LOAD_LOADED);
+	g_assert (cal_client_get_load_state (tasks_client) == CAL_CLIENT_LOAD_LOADED);
+
+	uids = cal_client_get_uids (calendar_client, CALOBJ_TYPE_TODO);
+
+	success = TRUE;
+	at_least_one = FALSE;
+
+	for (l = uids; l; l = l->next) {
+		const char *uid;
+		CalComponent *comp;
+		CalClientGetStatus status;
+
+		at_least_one = TRUE;
+
+		uid = l->data;
+		status = cal_client_get_object (calendar_client, uid, &comp);
+
+		switch (status) {
+		case CAL_CLIENT_GET_SUCCESS:
+			if (cal_client_update_object (tasks_client, comp))
+				cal_client_remove_object (calendar_client, uid);
+			else
+				success = FALSE;
+
+			gtk_object_unref (GTK_OBJECT (comp));
+			break;
+
+		case CAL_CLIENT_GET_NOT_FOUND:
+			/* This is OK; the object may have disappeared from the server */
+			break;
+
+		case CAL_CLIENT_GET_SYNTAX_ERROR:
+			success = FALSE;
+			break;
+
+		default:
+			g_assert_not_reached ();
+		}
+	}
+
+	cal_obj_uid_list_free (uids);
+
+	if (!at_least_one)
+		return;
+
+	if (success)
+		gnome_ok_dialog (_("Evolution has taken the tasks that were in your calendar folder "
+				   "and automatically migrated them to the new tasks folder."));
+	else
+		gnome_ok_dialog (_("Evolution has tried to take the tasks that were in your "
+				   "calendar folder and migrate them to the new tasks folder.\n"
+				   "Some of the tasks could not be migrated, so "
+				   "this process may be attempted again in the future."));
+}
+
+/* Displays an error to indicate that a calendar could not be opened */
+static void
+open_error (const char *uri)
+{
+	char *msg;
+
+	msg = g_strdup_printf (_("Could not open `%s'; no items from the calendar folder "
+				 "will be migrated to the tasks folder."),
+				 uri);
+	gnome_error_dialog (msg);
+	g_free (msg);
+}
+
+/* Displays an error to indicate that a URI method is not supported */
+static void
+method_error (const char *uri)
+{
+	char *msg;
+
+	msg = g_strdup_printf (_("The method required to load `%s' is not supported; "
+				 "no items from the calendar folder will be migrated "
+				 "to the tasks folder."),
+			       uri);
+	gnome_error_dialog (msg);
+	g_free (msg);
+}
+
+/* Callback used when the tasks client is finished loading */
+static void
+tasks_opened_cb (CalClient *client, CalClientOpenStatus status, gpointer data)
+{
+	g_assert (calendar_client != NULL);
+	g_assert (cal_client_get_load_state (calendar_client) == CAL_CLIENT_LOAD_LOADED);
+
+	switch (status) {
+	case CAL_CLIENT_OPEN_SUCCESS:
+		migrate ();
+		break;
+
+	case CAL_CLIENT_OPEN_ERROR:
+		open_error (cal_client_get_uri (client));
+		migrated = FALSE;
+		break;
+
+	case CAL_CLIENT_OPEN_NOT_FOUND:
+		/* This can't happen because we did not specify only_if_exists when
+		 * issuing the open request.
+		 */
+		g_assert_not_reached ();
+		break;
+
+	case CAL_CLIENT_OPEN_METHOD_NOT_SUPPORTED:
+		method_error (cal_client_get_uri (client));
+		migrated = FALSE;
+		break;
+
+	default:
+		g_assert_not_reached ();
+	}
+
+	gtk_object_unref (GTK_OBJECT (calendar_client));
+	calendar_client = NULL;
+
+	gtk_object_unref (GTK_OBJECT (tasks_client));
+	tasks_client = NULL;
+}
+
+/* Initiates the loading process for the tasks client */
+static gboolean
+load_tasks_client (void)
+{
+	char *uri;
+	gboolean success;
+
+	g_assert (calendar_client != NULL);
+	g_assert (cal_client_get_load_state (calendar_client) == CAL_CLIENT_LOAD_LOADED);
+
+	tasks_client = cal_client_new ();
+	if (!tasks_client)
+		goto error;
+
+	gtk_signal_connect (GTK_OBJECT (tasks_client), "cal_opened",
+			    GTK_SIGNAL_FUNC (tasks_opened_cb),
+			    NULL);
+
+	uri = g_strdup_printf ("%s/local/Tasks/tasks.ics", evolution_dir);
+	success = cal_client_open_calendar (tasks_client, uri, FALSE);
+	g_free (uri);
+
+	if (success)
+		return TRUE;
+
+ error:
+	g_message ("load_tasks_client(): could not issue open request for the tasks client");
+
+	if (tasks_client) {
+		gtk_object_unref (GTK_OBJECT (tasks_client));
+		tasks_client = NULL;
+	}
+
+	return FALSE;
+}
+
+/* Callback used when the calendar client finishes loading */
+static void
+calendar_opened_cb (CalClient *client, CalClientOpenStatus status, gpointer data)
+{
+	switch (status) {
+	case CAL_CLIENT_OPEN_SUCCESS:
+		if (!load_tasks_client ()) {
+			migrated = FALSE;
+			break;
+		}
+
+		return;
+
+	case CAL_CLIENT_OPEN_ERROR:
+		open_error (cal_client_get_uri (client));
+		migrated = FALSE;
+		break;
+
+	case CAL_CLIENT_OPEN_NOT_FOUND:
+		/* This is OK; the calendar folder did not exist in the first
+		 * place so there is nothing to migrate.
+		 */
+		break;
+
+	case CAL_CLIENT_OPEN_METHOD_NOT_SUPPORTED:
+		method_error (cal_client_get_uri (client));
+		migrated = FALSE;
+		break;
+
+	default:
+		g_assert_not_reached ();
+	}
+
+	gtk_object_unref (GTK_OBJECT (calendar_client));
+	calendar_client = NULL;
+}
+
+/* Initiates the loading process for the calendar client */
+static gboolean
+load_calendar_client (void)
+{
+	char *uri;
+	gboolean success;
+
+	/* First we load the calendar client; the tasks client will be loaded
+	 * later only if the former one succeeds.
+	 */
+
+	calendar_client = cal_client_new ();
+	if (!calendar_client)
+		goto error;
+
+	gtk_signal_connect (GTK_OBJECT (calendar_client), "cal_opened",
+			    GTK_SIGNAL_FUNC (calendar_opened_cb),
+			    NULL);
+
+	uri = g_strdup_printf ("%s/local/Calendar/calendar.ics", evolution_dir);
+	success = cal_client_open_calendar (calendar_client, uri, TRUE);
+	g_free (uri);
+
+	if (success)
+		return TRUE;
+
+ error:
+	g_message ("load_calendar_client(): could not issue open request for the calendar client");
+
+	if (calendar_client) {
+		gtk_object_unref (GTK_OBJECT (calendar_client));
+		calendar_client = NULL;
+	}
+
+	return FALSE;
+}
+
+/**
+ * tasks_migrate:
+ *
+ * Initiates the asynchronous process that migrates the tasks from the default
+ * user calendar folder to the default tasks folder.  This is because Evolution
+ * used to store tasks in the same folder as the calendar by default, but they
+ * are separate folders now.
+ **/
+void
+tasks_migrate (void)
+{
+	g_assert (!migrated);
+	migrated = TRUE;
+
+	if (!load_calendar_client ())
+		migrated = FALSE;
+}