def open_submission(self, url=None):
        """
        Select the current submission to view posts.
        """
        if url is None:
            data = self.get_selected_item()
            url = data['permalink']
            if data.get('url_type') == 'selfpost':
                self.config.history.add(data['url_full'])

        self.selected_page = self.open_submission_page(url)

        Select the current submission to view posts.
        
rtv/subreddit_page.py