qdunkan:
it seems that script may be not terminated if its output isn't read, so better code should be
(_, h, g, _) <- runInteractiveCommand "script params" result <- hGetLine h hGetContents h >>= evaluate.length hGetContents g >>= evaluate.length
Tangent here, but does anyone else think that something like hGetContentsEagerly would be handy in System.IO? When I am reading lots of little files I worry about open file limits. And besides, it seems like unsafeInterleaveIO can result in IO exceptions coming from pure code, so why use it if you don't have to?
I'll put a System.IO.Strict up on the weekend. Until then, perhaps use, as I sometimes do: import qualified Data.ByteString as S hGetContentsStrict = S.unpack `fmap` S.hGetContents Cheers, Don