Re: [Haskell-cafe] Unwrapping long lines in text files

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 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.