Hi, On 14 March 2012 13:51, Volker Wysk wrote:

import System

main = do

[a] <- getArgs

putStrLn (show a)

a here is already of type String. If you don't call show on it, it'll do the expected thing. Try: main = do [a] <- getArgs putStrLn a HTH, Ozgur

Quoth Volker Wysk , ...

I'll report this as a bug in the GHC Trac. But for now, I need to work around the problem somehow. The encoders in GHC.IO.Encoding all work on buffers. How do I recode the command line, in order to get proper Unicode strings?

Data.Text might work for you. I'm not guaranteeing that you'll get a "proper Unicode string" out of this, but you'll get a String with one (LATIN-1) value per character: import qualified Data.ByteString.Char8 as P import Data.Text.Encoding (decodeUtf8) import qualified Data.Text as T let arghs = ["\195\164"] let args = map (T.unpack . decodeUtf8 . P.pack) arghs Donn

On Wed, 14 Mar 2012 14:51:59 +0100 Volker Wysk wrote:

Hi!

The following program demonstrates a (another) GHC bug. The command line isn't properly decoded to Unicode.

arg.hs------------------------------

import System main = do [a] <- getArgs putStrLn (show a)

--------------------------------------

When called like this:

./arg ä

The program will output this:

"\195\164"

First, no need for 'show'. It will try to serialize value in a portable way. 'putStrLn a' should do the right thing (but see below). Second, it was fixed in ghc-7.2+. System.Environment now returns properly encoded Strings instead of byte-encoded oddity it returned before. So you can use 'putStrLn a' there. Previous version would require you to recode the result to proper String -- Sergei