Testing if a file is connected to a terminal

[Adam D. Ruppe via Digitalmars-d-learn]

On Thursday, 17 December 2015 at 03:59:27 UTC, Jakob Ovrum wrote:
> There are some terminal libraries on Github (like consoled) but 
> I have to say I think they're uninspiring in terms of quality 
> and presentation.

Can you be any more specific about that?