Fergus Henderson
Also, hat-trail failed to properly restore the tty state after ":q".
I am using "Konsole" (specifically, Konsole 1.3.2 with KDE 3.2.2). But the same problem also happens if I use "xterm".
Aha! Terminal resetting works fine with all of the following: xterm, konsole, gnome-terminal, provided you are using ghc-5. But it breaks on all of the above if you use ghc-6. So there is something decidedly odd going on. Here is the relevant code in hat-trail: resetSystem :: State -> IO () resetSystem state = do putStr (enableScrollRegion 1 (height state)) putStr (goto 1 (height state)) System.system ("stty icanon echo") return () which looks fine to me. Indeed, here is a mini-test program that actually works in ghc-6.2.1 without breaking the terminal settings: import System; import Char; import IO main = do hSetBuffering stdin NoBuffering hSetBuffering stdout NoBuffering system ("stty -icanon -echo") getChars system ("stty icanon echo") putStrLn "Done" getChars = do c <- getChar putChar (toUpper c) if c=='q' then return () else getChars I'm inclined to report this as a bug in ghc, even though I don't seem to be able to cut down the problem to a simple test case. Regards, Malcolm