Macro cwriteln_rule 

macro_rules! cwriteln_rule {
    ($stream:expr) => { ... };
    ($stream:expr, $(fg=$fg:expr,)? $(bg=$bg:expr,)? $(bold=$bold:expr,)? $(dimmed=$dimmed:expr,)? $literal:literal $($arg:tt)*) => { ... };
}

Print a rule of dashes, optionally with an embedded message.

-[messsage]----------------- ...