I think something like this would work: myFlag = unsafePerformIO $ do [x] <- getArgs return $ x == "debug" In general, unsafePerformIO should be avoided, but this is one of those situations where we can give you a pass ;). Michael On Sun, Dec 26, 2010 at 9:53 PM, <briand@aracnet.com> wrote:
Hi,
I have a program with a debug flag in it (Strangely I've yet to be able to write bug-free code). I'd like to change the state of the debug flag based on command line args.
I looked at IOVar but that would cause all the pure procedures to get swallowed by the IO Monad.
Is a better way to get this behavior ?
Thanks,
Brian
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe