Mike Meyer wrote:
Yitzchak Gale wrote:
Heinrich Apfelmus wrote:
Here one possibility for a lazier version of withFile' :
Very nice. I hope you don't mind if I use it?
Sure, go ahead. (I hereby put it into the public domain.)
Whether you are using lazy IO or Iteratees, we really need some better higher-level combinators with simpler semantics for more of the common use cases. Then it won't really matter.
And that was my conclusion last night. Iteratees provide generalized tools that don't seem to have obvious ways to do common operations. While that kind of thing is needed, I suspect that over 90% of file processing (at least for command line arguments) could be handled by things like Heinrich's withFiles and the obvious variants of the HOF list functions, like:
fileMap :: (String -> a) -> [FilePath] -> [a] fileFoldl' :: (a -> String -> a) -> a -> [FilePath] -> a
The user doesn't care whether it's using lazy IO or iteratees, so long as it has the proper semantics.
Indeed. It might be worthwhile to make a package on Haskell that provides these functions, or even to put them into the base libraries. Best regards, Heinrich Apfelmus -- http://apfelmus.nfshost.com