From 02a7ab821520e0f33474e10415c488cdc44bb59d Mon Sep 17 00:00:00 2001
From: Xavier Claessens <xclaesse@src.gnome.org>
Date: Sat, 8 Mar 2008 16:18:53 +0000
Subject: Do not run multiple instances of empathy. Fixes bug #501805 (Marco
 Barisione).

svn path=/trunk/; revision=711
---
 src/empathy.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)

(limited to 'src/empathy.c')

diff --git a/src/empathy.c b/src/empathy.c
index e16aaf165..863d307f2 100644
--- a/src/empathy.c
+++ b/src/empathy.c
@@ -23,10 +23,12 @@
 #include <config.h>
 
 #include <stdlib.h>
+#include <errno.h>
 
 #include <glib.h>
 #include <glib/gi18n.h>
 #include <gtk/gtk.h>
+#include <gdk/gdkx.h>
 
 #include <libebook/e-book.h>
 #include <libgnomevfs/gnome-vfs.h>
@@ -45,8 +47,12 @@
 #include <libempathy-gtk/empathy-main-window.h>
 #include <libempathy-gtk/empathy-status-icon.h>
 
+#include "bacon-message-connection.h"
+
 #define DEBUG_DOMAIN "EmpathyMain"
 
+static BaconMessageConnection *connection = NULL;
+
 static void
 service_ended_cb (MissionControl *mc,
 		  gpointer        user_data)
@@ -184,9 +190,87 @@ create_salut_account (void)
 	g_object_unref (book);
 }
 
+/* The code that handles single-instance and startup notification is
+ * copied from gedit.
+ *
+ * Copyright (C) 2005 - Paolo Maggi 
+ */
+static void
+on_bacon_message_received (const char *message,
+			   gpointer    data)
+{
+	GtkWidget *window = data;
+	guint32    startup_timestamp;
+
+	g_return_if_fail (message != NULL);
+
+	empathy_debug (DEBUG_DOMAIN,
+		       "Other instance launched, presenting the main window "
+		       "(message is '%s')", message);
+
+	startup_timestamp = atoi (message);
+
+	/* Set the proper interaction time on the window.
+	 * Fall back to roundtripping to the X server when we
+	 * don't have the timestamp, e.g. when launched from
+	 * terminal. We also need to make sure that the window
+	 * has been realized otherwise it will not work. lame. */
+	if (startup_timestamp == 0) {
+		/* Work if launched from the terminal */
+		empathy_debug (DEBUG_DOMAIN, "Using X server timestamp as a fallback");
+
+		if (!GTK_WIDGET_REALIZED (window)) {
+			gtk_widget_realize (GTK_WIDGET (window));
+		}
+
+		startup_timestamp = gdk_x11_get_server_time (window->window);
+	}
+
+	gtk_window_present_with_time (GTK_WINDOW (window), startup_timestamp);
+}
+
+static guint32
+get_startup_timestamp ()
+{
+	const gchar *startup_id_env;
+	gchar       *startup_id = NULL;
+	gchar       *time_str;
+	gchar       *end;
+	gulong       retval = 0;
+
+	/* we don't unset the env, since startup-notification
+	 * may still need it */
+	startup_id_env = g_getenv ("DESKTOP_STARTUP_ID");
+	if (startup_id_env == NULL) {
+		goto out;
+	}
+
+	startup_id = g_strdup (startup_id_env);
+
+	time_str = g_strrstr (startup_id, "_TIME");
+	if (time_str == NULL) {
+		goto out;
+	}
+
+	errno = 0;
+
+	/* Skip past the "_TIME" part */
+	time_str += 5;
+
+	retval = strtoul (time_str, &end, 0);
+	if (end == time_str || errno != 0)
+		retval = 0;
+
+ out:
+	g_free (startup_id);
+
+	return (retval > 0) ? retval : 0;
+}
+
 int
 main (int argc, char *argv[])
 {
+	guint32            startup_timestamp;
 	EmpathyStatusIcon *icon;
 	GtkWidget         *window;
 	MissionControl    *mc;
@@ -201,6 +285,8 @@ main (int argc, char *argv[])
 	bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
 	textdomain (GETTEXT_PACKAGE);
 
+	startup_timestamp = get_startup_timestamp ();
+
 	if (!gtk_init_with_args (&argc, &argv,
 				 _("- Empathy Instant Messenger"),
 				 NULL, GETTEXT_PACKAGE, &error)) {
@@ -215,6 +301,31 @@ main (int argc, char *argv[])
 					   PKGDATADIR G_DIR_SEPARATOR_S "icons");
 	gnome_vfs_init ();
 
+        /* Setting up the bacon connection */
+	connection = bacon_message_connection_new ("empathy");
+	if (connection != NULL) {
+		if (!bacon_message_connection_get_is_server (connection)) {
+			gchar *message;
+
+			empathy_debug (DEBUG_DOMAIN, "Activating existing instance");
+
+			message = g_strdup_printf ("%" G_GUINT32_FORMAT,
+						   startup_timestamp);
+			bacon_message_connection_send (connection, message);
+
+			/* We never popup a window, so tell startup-notification
+			 * that we are done. */
+			gdk_notify_startup_complete ();
+
+			g_free (message);
+			bacon_message_connection_free (connection);
+
+			return EXIT_SUCCESS;
+		}
+	} else {
+		g_warning ("Cannot create the 'empathy' bacon connection.");
+	}
+
 	/* Setting up MC */
 	monitor = mc_account_monitor_new ();
 	mc = empathy_mission_control_new ();
@@ -243,6 +354,13 @@ main (int argc, char *argv[])
 	window = empathy_main_window_show ();
 	icon = empathy_status_icon_new (GTK_WINDOW (window));
 
+	if (connection) {
+		/* We se the callback here because we need window */
+		bacon_message_connection_set_callback (connection,
+						       on_bacon_message_received,
+						       window);
+	}
+
 	gtk_main ();
 
 	empathy_idle_set_state (idle, MC_PRESENCE_OFFLINE);
-- 
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