GHC as a library - getting output from GHCI
simonpj at microsoft.com
Thu May 10 03:24:55 EDT 2007
| Also if stmt =
| SomeModule.prettyPrinter "foobar"
| and SomeModule contains
| prettyPrinter x = putStrLn $ "Pretty: " ++ x
| then the let binding will not catch it.
Indeed, that's exactly what I meant in my original msg. I have always thought it ugly that stdin and stdout are top-level definitions. I want to be able to say
withStdout :: Handle -> IO a -> IO a
so that (withStdout h a) runs 'a' but sends all std-out output to h.
Haskell should support this. Starting a whole OS process to redirect stdout must surely be overkill!
(But maybe that is what you have to do today.)
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