Handles permissions
    Syntax: {command} (--add|--remove) --nick (nick) --role (admin)

def cmd(send, msg, args):
    """Handles permissions
    Syntax: {command} (--add|--remove) --nick (nick) --role (admin)
    """
    parser = arguments.ArgParser(args['config'])
    parser.add_argument('--nick', action=arguments.NickParser, required=True)
    parser.add_argument('--role', choices=['admin'], required=True)
    group = parser.add_mutually_exclusive_group(required=True)
    group.add_argument('--add', action='store_true')
    group.add_argument('--remove', action='store_true')
    try:
        cmdargs = parser.parse_args(msg)
    except arguments.ArgumentException as e:
        send(str(e))
        return
    session = args['db']
    admin = session.query(Permissions).filter(Permissions.nick == cmdargs.nick).first()
    if cmdargs.add:
        if admin is None:
            session.add(Permissions(nick=cmdargs.nick, role=cmdargs.role))
            send("%s is now an %s." % (cmdargs.nick, cmdargs.role))
        else:
            send("%s is already an %s." % (admin.nick, admin.role))
    else:
        if admin is None:
            send("%s was not an %s." % (cmdargs.nick, cmdargs.role))
        else:
            session.delete(admin)
            send("%s is no longer an %s." % (admin.nick, admin.role))