# add default options values to config.conf.* dict
        conf.add_plugin_defaults(self.meta, self.module)
        
        # Only if streamtuner2 is run in graphical mode        
        if (parent):
            # Update/display stream processors
            if not self.prepare_filters:
                self.prepare_filters += [
                    self.prepare_filter_icons,
                ]
            if not self.postprocess_filters:
                self.postprocess_filters += [
                    self.postprocess_filter_required_fields,
                    self.postprocess_filter_homepage,
                ]
            # Load cache, instantiate Gtk widgets
            self.cache()
            self.gui(parent)

        # Stub for ST2 main window / dispatcher
        else:
            self.parent = stub_parent(None)

                new_streams = self.update_streams(category)
  
            # Postprocess new list of streams (e.g. assert existing title and url)
            if new_streams:
                try:
                    new_streams = self.postprocess(new_streams)
                except Exception as e:
                    log.ERR("Updating new streams, postprocessing failed:", e)
  
                # don't lose forgotten streams
                if conf.retain_deleted:
                   self.streams[category] = new_streams + self.deleted_streams(new_streams, self.streams.get(category,[]))
                else:
                   self.streams[category] = new_streams
  

    
    # Prepare stream list for display
    prepare_filters = []
    def prepare(self, streams):
        for f in self.prepare_filters:
            map(f, streams)
        return streams

    # state icon: bookmark star, or deleted mark
    def prepare_filter_icons(self, row):
        if conf.show_bookmarks:# and "bookmarks" in self.parent.channels:
            row["favourite"] = self.parent.bookmarks.is_in(row.get("url", "file:///tmp/none"))
        if not row.get("state"):
            if row.get("favourite"):
                row["state"] = gtk.STOCK_ABOUT
            if row.get("deleted"):
                row["state"] = gtk.STOCK_DELETE


    # Stream list preparations - invoked directly after reload(),
    # callbacks can remove entries, or just update fields.
    postprocess_filters = []
    def postprocess(self, streams):
        for f in self.postprocess_filters:
            streams = [row for row in streams if f(row, self)]
        return streams

    # Filter entries without title or url
    def postprocess_filter_required_fields(self, row, channel):
        return not len(set(["", None]) & set([row.get("title"), row.get("url")]))

    # Deduce homepage URLs from title
    # by looking for www.xyz.com domain names
    def postprocess_filter_homepage(self, row, channel):
        if not row.get("homepage"):
            url = self.rx_www_url.search(row.get("title", ""))
            if url:
                url = url.group(0).lower().replace(" ", "")
                url = (url if url.find("www.") == 0 else "www."+url)
                row["homepage"] = ahttp.fix_url(url)
                print row