Macro vsmtp_common::queue_path

macro_rules! queue_path {
    ($queues_dirpath:expr, $queue:expr) => { ... };
    ($queues_dirpath:expr, $queue:expr, $msg_id:expr) => { ... };
    (create_if_missing => $queues_dirpath:expr, $queue:expr) => { ... };
    (create_if_missing => $queues_dirpath:expr, $queue:expr, $msg_id:expr) => { ... };
}

Syntax sugar for access of queues folder and queues items

Errors

• if create_if_missing is provided, will attempt to create the folder