Macro redis_command

macro_rules! redis_command {
    (
        $ctx:expr,
        $command_name:expr,
        $command_handler:expr,
        $command_flags:expr,
        $firstkey:expr,
        $lastkey:expr,
        $keystep:expr
        $(,
            $command_acl_categories:expr
        )?
        ) => { ... };
}