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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) "