On 05/07/2009 13:15, Ian Lynagh wrote:
On Tue, Jun 30, 2009 at 01:03:17PM +0100, Simon Marlow wrote:
* http://www.haskell.org/~simonmar/base/System-IO.html#23 System.IO (Unicode encoding/decoding)
Is it possible to make an availableEncodings :: IO [(String, TextEncoding)] ?
No way that I know of. iconv doesn't give you a way to enumerate the available encodings.
Also, mkTextEncoding says that it throws an isDoesNotExistError if the named encoding doesn't exist, but the code in base at least looks like it throws InvalidArgument on Windows, and nothing on other platforms. Perhaps it's different in your tree, though.
It throws NoSuchThing on Windows: mkTextEncoding e = ioException (IOError Nothing NoSuchThing "mkTextEncoding" ("unknown encoding:" ++ e) Nothing Nothing) but on Unix, you're right, there's no exception until the encoding is instantiated, which happens when a Handle is opened. I'll look into fixing this. Cheers, Simon