[Haskell-cafe] Re: IO inside CGI

Adrian Neumann wrote:

Now I'd like to get a new StdGen, in case no id was supplied to the script.

parse :: Maybe String-> IO StdGen parse (Just x) = return $ read x parse Nothing = getStdGen

Obviously this doesn't work because I'm trying to do IO inside CGI (right?). Is there some incantation I can perform to make this possible?

Abracadabra, the incantation is liftIO :: IO a -> CGI a i.e. parse :: Maybe String-> CGI StdGen parse (Just x) = return $ read x parse Nothing = liftIO getStdGen Regards, apfelmus