Add methods to build gen to DiscussionParser

With the new wrapper script the Bot gets a GenFactory and has to build
a generator out of it by its own

Related Task: [https://fs.golderweb.de/index.php?do=details&task_id=83 FS#83]

bots/reddiscparser.py

@@ -58,7 +58,47 @@ class DiscussionParserBot(
                               to work.
             @type generator: generator.
         """
-        super( DiscussionParserBot, self ).__init__(generator=generator)
+
+    def build_generator(self):
+        """
+        Builds generator to work on, based on self.genFactory
+        """
+        # Check wether there are generators waiting for factoring, if not
+        # use configured categories
+        if not self.genFactory.gens:
+            self.apply_conf_cat_generators()
+
+        # Create combined Generator (Union of all Generators)
+        gen = self.genFactory.getCombinedGenerator()
+
+        if gen:
+            # The preloading generator is responsible for downloading multiple
+            # pages from the wiki simultaneously.
+            self.gen = pagegenerators.PreloadingGenerator(gen)
+
+        else:
+            pywikibot.showHelp()
+
+    def apply_conf_cat_generators( self ):
+        """
+        Builds generators for categories which are read from jogobot.config
+
+        Parameters:
+            @param genFactory: The GeneratorFactory to which the builded
+                               generators should be added.
+            @type genFactory: pagegenerators.GeneratorFactory
+        """
+        # Create Generators for configured Categories
+        for category in jogobot.config["redundances"]["redpage_cats"]:
+            gen = self.genFactory.getCategoryGen(
+                category, gen_func=pagegenerators.CategorizedPageGenerator)
+
+            # If there is one, append to genFactory
+            if gen:
+                self.genFactory.gens.append(gen)
+
+            # Reset gen for next iteration
+            gen = None
 
     def run( self ):
         """