Display "View Source" link in MediaWiki for logged out users

gistfile1.aw

                if ( !$wgUser->isAllowed('edit') ) {                                                
#                       if ( $wgUser->isAnon() ) {                                                  
#                                $this->userNotLoggedInPage();                                      
#                               return;                                                             
#                       } else {                                                                    
#                               $wgOut->readOnlyPage( $this->mArticle->getContent( true ), true );  
#                               return;                                                             
#                       }                                                                           
                                                                                                    
                        # Make source available to anon users                                       
                        $wgOut->readOnlyPage( $this->mArticle->getContent( true ), true );          
                        return;                                                                     
                }