Prompting for a password in Haskell command line application

Question

The following Haskell program prompts the user for a password in the terminal and continues if he has entered the correct one:

main = do
    putStrLn \"Password:         


        

Answer 1

withEcho can be written with a little less noise:

withEcho :: Bool -> IO a -> IO a
withEcho echo action =
    bracket (hGetEcho stdin)
            (hSetEcho stdin)
            (const $ hSetEcho stdin echo >> action)