def METHOD_NAME(name, rawtext, text, lineno, inliner, options={}, content=[]):
    """Link to a GitHub user.
    Returns 2 part tuple containing list of nodes to insert into the
    document and a list of system messages.  Both are allowed to be
    empty.
    :param name: The role name used in the document.
    :param rawtext: The entire markup snippet, with role.
    :param text: The text marked with the role.
    :param lineno: The line number where rawtext appears in the input.
    :param inliner: The inliner instance that called us.
    :param options: Directive options for customization.
    :param content: The directive content for customization.
    """
    app = inliner.document.settings.env.app
    #app.info('user link %r' % text)
    ref = 'https://www.github.com/' + text
    node = nodes.reference(rawtext, text, refuri=ref, **options)
    return [node], []