def add_push_parser(sub_parser):
    """
    Adds a sub-parser for the "push" sub-command to the parser provided.

    :param sub_parser: the parser to add to
    :type sub_parser: <class 'argparse.ArgumentParser'>
    """
    push_parser = sub_parser.add_parser('push', help='Push file to remote')
    push_parser.add_argument('remote', help='remote to push')
    push_parser.add_argument('-k', '--key', help=
        'key of file to push (from .surround/config.yaml)')
