Prevent the rooms from going “offline”

Add a blacklist inside the roster that contains the bare JIDs of all the
rooms ever joined in this session, so that no JID using this server will
ever be shown as getting “offline”.

If there is a cleaner way to do that (discriminating JIDs), I welcome it.

src/core.py

@@ -658,12 +658,17 @@ class Core(object):
         self.add_tab(form_tab, True)
 
     def on_got_offline(self, presence):
+        """
+        A JID got offline
+        """
         jid = presence['from']
         logger.log_roster_change(jid.bare, 'got offline')
         # If a resource got offline, display the message in the conversation with this
         # precise resource.
         if jid.resource:
             self.add_information_message_to_conversation_tab(jid.full, '\x195}%s is \x191}offline' % (jid.full))
+        if jid.server in roster.blacklist:
+            return
         self.add_information_message_to_conversation_tab(jid.bare, '\x195}%s is \x191}offline' % (jid.bare))
         self.information('\x193}%s \x195}is \x191}offline' % (jid.bare), 'Roster')
         if isinstance(self.current_tab(), tabs.RosterInfoTab):

src/roster.py

@@ -19,6 +19,10 @@ from sleekxmpp.xmlstream.stanzabase import JID
 from sleekxmpp.exceptions import IqError
 
 class Roster(object):
+
+    # MUC domains to blacklist from the contacts roster
+    blacklist = set()
+
     def __init__(self):
         """
         node: the RosterSingle from SleekXMPP
@@ -103,7 +107,7 @@ class Roster(object):
 
     def jids(self):
         """List of the contact JIDS"""
-        return [key for key in self.__node.keys() if key not in self.__mucs and key != self.jid]
+        return [key for key in self.__node.keys() if JID(key).server not in self.blacklist and key != self.jid]
 
     def get_contacts(self):
         """

src/tabs.py

@@ -1171,6 +1171,7 @@ class MucTab(ChatTab):
                 self.core.events.trigger('muc_join', presence, self)
                 if from_nick == self.own_nick:
                     self.joined = True
+                    roster.blacklist.add(JID(from_room).server)
                     if self.get_name() in self.core.initial_joins:
                         self.core.initial_joins.remove(self.get_name())
                         self._state = 'normal'