NOTE: Even the examples are correct in the H98 libraries documentation in the IO module section, they are incorrect in the H98 Report: http://www.haskell.org/onlinereport/io-13.html Scroll down, to 7.2.
<snip> > when I put the same code through ghc, it waits for a command first, and > then when the command has been entered it displays the prompt, which is > just silly. Surely the 'do' notation was designed to sequence > computations, but it obviously isn't behaving quite right here! The problem is that stdout is buffered by default and *not flushed when you're waiting for input in stdin*, IMO it should be. IIRC this was a change that happened between the somwhere between 5.00.1 and 5.02.2. I remember suddenly all my programs not working correctly anymore... > I'd be very grateful for any suggestions as to how to fix this. > thanks, One way is to *import IO* and set stdout to NoBuffering > mainLoop :: IO TRS -> IO () > mainLoop t = do putStr "\n>> " > hSetBuffering stdout NoBuffering -- HERE!!! > (c,a) <- getCommand 0 > case c of > "help" -> do putStr help > mainLoop t > "load" -> do trs <- load a > putStr "" > mainLoop (return trs) > "show" -> ...and so on... You may also flush stdout every time you want using hflush. Check the haskell libraries documentation for the IO module for more info. J.A. _______________________________________________ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
