Add wrapper-generator to redfam.article_generator

We need a wrapper around redfam.article_generator to pass it to
pagegenerators.PageWithTalkPageGenerator and to add a reference to
related redfam to each pywikibot.page-object before yielding it

Related Task: [https://fs.golderweb.de/index.php?do=details&task_id=88 FS#88]

bots/markpages.py

@@ -88,6 +88,26 @@ class MarkPagesBot( CurrentPageBot ):  # sets 'current_page' on each treat()
         """
         self.gen = self.genFactory.getCombinedGenerator()
 
+    def redfam_talkpages_generator( self ):
+        """
+        Wrappers the redfam.article_generator and
+        passes it to pagegenerators.PageWithTalkPageGenerator().
+        Then  it iterates over the generator and adds a reference to the
+        related redfam to each talkpage-object.
+        """
+
+        for redfam in self.redfams:
+
+            # We need the talkpage (and only this) of each existing page
+            for talkpage in pagegenerators.PageWithTalkPageGenerator(
+                    redfam.article_generator( filter_existing=True ),
+                    return_talk_only=True ):
+
+                # Add reference to redfam to talkpages
+                talkpage.redfam = redfam
+
+                yield talkpage
+
     def treat_page( self ):
         """
         Handles work on current page