Haskell read raw keyboard input

Question

I\'m writing a terminal-mode program in Haskell. How would I go about reading raw keypress information?

In particular, there seems to be something providing line-edi

Answer 1

Sounds like you want readline support. There are a couple of packages to do this, but haskeline is probably the easiest to use with the most supported platforms.

import Control.Monad.Trans
import System.Console.Haskeline

type Repl a = InputT IO a

process :: String -> IO ()
process = putStrLn

repl :: Repl ()
repl = do
  minput <- getInputLine "> "
  case minput of
    Nothing -> outputStrLn "Goodbye."
    Just input -> (liftIO $ process input) >> repl

main :: IO ()
main = runInputT defaultSettings repl