Change redfam generator filters

Change and clear up the filters in redfam generator to keep track of
article status and use positive conditionals

lib/redfam.py

@@ -491,6 +491,28 @@ class RedFamWorker( RedFam ):
 
             page = pywikibot.Page(pywikibot.Link(article), pywikibot.Site())
 
+            # Filter existing pages if requested with filter_existing=False
+            if page.exists():
+                self.article_remove_status( "deleted", title=article )
+                if filter_existing is False:
+                    continue
+            # Filter non existing Pages if requested with filter_existing=True
+            else:
+                self.article_add_status( "deleted", title=article )
+                if filter_existing:
+                    continue
+
+            # Filter redirects if requested with filter_redirects=True
+            if page.isRedirectPage():
+                self.article_add_status( "redirect", title=article )
+                if filter_redirects:
+                    continue
+            # Filter noredirects if requested with filter_redirects=False
+            else:
+                self.article_remove_status("redirect", title=article )
+                if filter_redirects is False:
+                    continue
+
             # Exclude by article status
             for status in exclude_article_status:
                 if self.article_has_status( status, title=article ):
@@ -501,20 +523,6 @@ class RedFamWorker( RedFam ):
                 if not self.article_has_status( status, title=article ):
                     continue
 
-            # Filter non existing Pages if requested with filter_existing=True
-            if filter_existing and not page.exists():
-                continue
-            # Filter existing pages if requested with filter_existing=False
-            elif filter_existing is False and page.exists():
-                continue
-
-            # Filter redirects if requested with filter_redirects=True
-            if filter_redirects and page.isRedirectPage():
-                continue
-            # Filter noredirects if requested with filter_redirects=False
-            elif filter_redirects is False and not page.isRedirectPage():
-                continue
-
             # Yield filtered pages
             yield page