haskeline-0.7.0.0: examples/Test.hs

module Main where

import System.Console.Haskeline
import System.Environment
import Control.Exception (AsyncException(..))

{--
Testing the line-input functions and their interaction with ctrl-c signals.

Usage:
./Test          (line input)
./Test chars    (character input)
./Test password (no masking characters)
./Test password \*
./Test initial  (use initial text in the prompt)
--}

mySettings :: Settings IO
mySettings = defaultSettings {historyFile = Just "myhist"}

main :: IO ()
main = do
        args <- getArgs
        let inputFunc = case args of
                ["chars"] -> fmap (fmap (\c -> [c])) . getInputChar
                ["password"] -> getPassword Nothing
                ["password", [c]] -> getPassword (Just c)
                ["initial"] -> flip getInputLineWithInitial ("left ", "right")
                _ -> getInputLine
        runInputT mySettings $ withInterrupt $ loop inputFunc 0
    where
        loop inputFunc n = do
            minput <-  handle (\Interrupt -> return (Just "Caught interrupted"))
                        $ inputFunc (show n ++ ":")
            case minput of
                Nothing -> return ()
                Just "quit" -> return ()
                Just "q" -> return ()
                Just s -> do
                            outputStrLn ("line " ++ show n ++ ":" ++ s)
                            loop inputFunc (n+1)