Re: no backspace, delete or arrow keys in ghci

Yes, it is when getLine is waiting for input. Everything is fine in the prompt. I didn't know that getLine behaves like that. I surely missed something. Trully sorry for, at the end, a so dumb question ! I'll follow your advices and try haskeline or readline :-) Anyway, many thanks for your so quick reply. Best regards, Gabriel Judah Jacobson a écrit :

On Mon, Sep 7, 2009 at 11:12 AM, Gabriel Schwanen wrote:

...

Hello to everybody,

I'm currently working with Haskell via the ghc interpreter (version 6.10.4 on Ubuntu 9.10).

The problem, if it is really a problem and not a normal comportement, happens when I try, as example, to enter some characters after having execute getLine. Actually, if I make a mistake when typing the string, I can't use neither backspace, delete or even arrow keys to correct it before hitting enter to finish input. In fact, as example, if I hit backspace, I get "^?" in place of deleting the previous character ... :^(

As I wrote above, I don't know if it is a "bug" or not. Maybe it is normal.

Can someone help me ?

I'm not sure I understand. Are you saying that you can't use backspace/arrows/etc when the getLine command itself is waiting for input? But otherwise at the "Prelude>" prompt, where you type in the commands, everything behaves fine?

If so, that is normal behavior for the getLine function. For a better input interface I'd recommend either the haskeline or readline packages, both available from hackage.haskell.org.

Best, -Judah