Hello, all is said in the subject, 
I use use the changeDir prompt with the autocompletion,
which is already an handy feature :)
I wander what I should add in XMonad/Prompt/Directory.hs 
to make the changeDir prompt call itself on sucess after the autocompletion.
I'm not a programmer so the ideas aren't springing on my keyboard for such 
questions.
All that I've tried result in errors in building.