code: def create_app(path=None, user_content=False, context=None, username=None,
                 password=None, render_offline=False, render_wide=False,
                 render_inline=False, api_url=None, title=None, text=None,
                 autorefresh=None, quiet=None, grip_class=None):
      
      # Customize the app
      if grip_class is None:
          grip_class = Grip
  
      # Customize the reader
      if text is not None:
          display_filename = DirectoryReader(path, True).filename_for(None)
          source = TextReader(text, display_filename)
      elif path == '-':
          source = StdinReader()
      else:
          source = DirectoryReader(path)
  
      # Customize the renderer
      if render_offline:
          renderer = OfflineRenderer(user_content, context)
      elif user_content or context or api_url:
          renderer = GitHubRenderer(user_content, context, api_url)
      else:
          renderer = None
  
      # Optional basic auth
      auth = (username, password) if username or password else None
  
      # Create the customized app with default asset manager
      return grip_class(source, auth, renderer, None, render_wide,
                        render_inline, title, autorefresh, quiet)
docs: Creates a Grip application with the specified overrides.