docs: def read_folder(folder):
      """Read all files of `folder` and return a list of HandwrittenData
      objects.
  
      Parameters
      ----------
      folder : string
          Path to a folder
  
      Returns
      -------
      list :
          A list of all .ink files in the given folder.
      """
      recordings = []
      for filename in glob.glob(os.path.join(folder, '*.ink')):
          recording = parse_scg_ink_file(filename)
          recordings.append(recording)
      return recordings