[Haskell-cafe] Unwrapping long lines in text files

[Bill Atkins]

Oof, that's what I get for making "just one little change" without testing.

You're right.

On Saturday Aug 14, 2010, at 9:17 AM, Felipe Lessa wrote:

> On Sat, Aug 14, 2010 at 9:59 AM, Bill Atkins <watkins at alum.rpi.edu> wrote:
>>  | otherwise                                        = let (line, rest) = splitAt maxLineLength line in
>>                                                                 line : wrapLine rest
> 
> I haven't tested myself, but does this work at all?  If I am reading
> it correctly, this is the same as
> 
>  let (foo, rest) = splitAt maxLineLength foo
>  in foo : wrapLine rest
> 
> In other words, no mention of wrapLine's argument 'line', and a
> recursive call that will bottom out and be the same as 'undefined' :).
> GHC would warn you, though, if you used -Wall.  That expression
> should read:
> 
>  let (thisLine, rest) = splitAt maxLineLength line
>  in thisLine : wrapLine rest
> 
> Cheers,
> 
> -- 
> Felipe.