Dear list,

the Show class is extremely useful for exploring Haskell in a terminal, but sometimes, I just want something fancier. For instance, I'm currently dabbling with sound generation and it is only natural that I want to hear the sound instead of seeing a textual representation. Another example would be graphics, that are simply drawn on screen whenever you evaluate their value.

Of course, this is simple to implement with a class

    class Demonstrable a where
        demo :: a -> IO ()

    instance Demonstrable Sound where demo = play
    instance Demonstrable Sound where demo = draw
    instance Demonstrable GUI   where demo = run
    etc.


However, I don't want to reinvent the wheel, small as it may be, hence my question: is there a package on hackage that already defines a class similar to Demonstrable ? Or any other projects in this direction, like, say, a fancy REPL built on wxHaskell?


Best regards,
Heinrich Apfelmus

--
http://apfelmus.nfshost.com


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