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m2ym/InterleavedGetLines.hs

Created July 28, 2010 07:23
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InterleavedGetLines.hs
import Control.Monad
import System.IO
import System.IO.Unsafe
ifte :: Monad m => m Bool -> m a -> m a -> m a
ifte c t e = c >>= \b -> if b then t else e
getLinesI :: IO [String]
getLinesI = unsafeInterleaveIO $ ifte isEOF (return []) (liftM2 (:) getLine getLinesI)
main = getLinesI >>= mapM_ putStrLn
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