human
Complete the below
def _render_filenames(path, dest, saltenv, template):

    ''''Process markup in the :param:`path` and :param:`dest` variables (NOT the
    files under the paths they ultimately point to) according to the markup
    format provided by :param:`template`.'
    '''
assistant
#Here is the Python code you requested.
    if (not template):
        return (path, dest)
    if (template not in salt.utils.templates.TEMPLATE_REGISTRY):
        raise CommandExecutionError(u'Attempted    to    render    file    paths    with    unavailable    engine    {0}'.format(template))
    kwargs = {}
    kwargs[u'salt'] = __salt__
    kwargs[u'pillar'] = __pillar__
    kwargs[u'grains'] = __grains__
    kwargs[u'opts'] = __opts__
    kwargs[u'saltenv'] = saltenv
    def _render(contents):
        '\n                                Render    :param:`contents`    into    a    literal    pathname    by    writing    it    to    a\n                                temp    file,    rendering    that    file,    and    returning    the    result.\n                                '
        tmp_path_fn = salt.utils.files.mkstemp()
        with salt.utils.files.fopen(tmp_path_fn, u'w+') as fp_:
            fp_.write(contents)
        data = salt.utils.templates.TEMPLATE_REGISTRY[template](tmp_path_fn, to_str=True, **kwargs)
        salt.utils.files.safe_rm(tmp_path_fn)
        if (not data[u'result']):
            raise CommandExecutionError(u'Failed    to    render    file    path    with    error:    {0}'.format(data[u'data']))
        else:
            return data[u'data']
    path = _render(path)
    dest = _render(dest)
    return (path, dest)