def cable_from_file(filename):
    """\
    Returns a cable from the provided file.
    
    `filename`
        An absolute path to the cable file.
    """
    html = codecs.open(filename, 'rb', 'utf-8').read()
    return cable_from_html(html, reader.reference_id_from_filename(filename))
\
    Returns a cable from the provided file.
    
    `filename`
        An absolute path to the cable file.