From 71e1194fcb39606336b0569147dd0f794b6bfa78 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Wed, 6 May 2015 06:27:15 +0300
Subject: initial commit

---
 Utils.hs | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Utils.hs

(limited to 'Utils.hs')

diff --git a/Utils.hs b/Utils.hs
new file mode 100644
index 0000000..21ee67b
--- /dev/null
+++ b/Utils.hs
@@ -0,0 +1,32 @@
+{-
+ - 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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