UTF-8
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The simplest solution seems to be to use the utf8-string package from Galois. It
provides a drop-in replacement for System.IO
Example
This example reverses every line in a file (saving the results in the file + ".rev")
If we use a function from System.IO.UTF8, we should also hide the equivalent one from the Prelude. (Alternatively, we could import the UTF8 module qualified)
> import System.IO.UTF8
> import Prelude hiding (readFile)
> main :: IO ()
> main =
> do args <- getArgs
> mapM_ reverseUTF8File args
> reverseUTF8File :: FilePath -> IO ()
> reverseUTF8File f =
> do f <- readFile f
> writeFile (f ++ ".rev) $ reverseLines f
> where
> reverseLines = unlines . map reverse . lines
<haskell>