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{-
- Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
- This file is licensed under the terms of the MIT License.
- See LICENSE.txt for details.
-}
module Utils where
import Control.Monad ( liftM )
import Data.Char ( toLower )
import System.IO ( hFlush, stdout )
prompt :: String -> IO String
prompt banner = do
putStr banner
hFlush stdout
getLine
promptYesNo :: String -> IO Bool
promptYesNo banner = do
response <- liftM (map toLower) $ prompt banner
if response `elem` yeses
then return True
else if response `elem` noes
then return False
else promptToContinue
where
yeses = ["y", "yes"]
noes = ["n", "no"]
promptToContinue :: IO Bool
promptToContinue = promptYesNo "Continue? (y/n) "
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