Prevent traceback when gajim-remote is used while gajim is not running. Add a check_gajim_running command to gajim-remote

src/gajim-remote.py

@@ -263,8 +263,13 @@ class GajimRemote:
 						(_('account'), _(''), False)
 					]
 				],
+			'check_gajim_running':[
+					_('Check if Gajim is running'),
+					[]
+				],
 
 			}
+		self.sbus = None
 		if self.argv_len  < 2 or \
 			sys.argv[1] not in self.commands.keys(): # no args or bad args
 			send_error(self.compose_help())
@@ -277,6 +282,9 @@ class GajimRemote:
 			sys.exit(0)
 		if self.command == 'handle_uri':
 			self.handle_uri()
+		if self.command == 'check_gajim_running':
+			print self.check_gajim_running()
+			sys.exit(0)
 		self.init_connection()
 		self.check_arguments()
 
@@ -332,6 +340,22 @@ class GajimRemote:
 			elif res:
 				print unicode(res).encode(PREFERRED_ENCODING)
 
+	def check_gajim_running(self):
+		if not self.sbus:
+			try:
+				self.sbus = dbus.SessionBus()
+			except:
+				raise exceptions.SessionBusNotPresent
+
+		test = False
+		if hasattr(self.sbus, 'name_has_owner'):
+			if self.sbus.name_has_owner(SERVICE):
+				test = True
+		elif dbus.dbus_bindings.bus_name_has_owner(self.sbus.get_connection(),
+		SERVICE):
+			test = True
+		return test
+
 	def init_connection(self):
 		''' create the onnection to the session dbus,
 		or exit if it is not possible '''
@@ -340,6 +364,8 @@ class GajimRemote:
 		except:
 			raise exceptions.SessionBusNotPresent
 
+		if not self.check_gajim_running():
+			send_error(_('It seems Gajim is not running. So you can\'t use gajim-remote.'))
 		obj = self.sbus.get_object(SERVICE, OBJ_PATH)
 		interface = dbus.Interface(obj, INTERFACE)