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authorEgor Tensin <Egor.Tensin@gmail.com>2016-07-18 00:09:44 +0300
committerEgor Tensin <Egor.Tensin@gmail.com>2016-07-18 00:09:44 +0300
commit14d1ee026b9f2dded1eb1adc51e50f6b779b4aa4 (patch)
tree60daf05b8eafaec8ae4d4d90ac6cc59b4a1af22a /apps/Utils.hs
parentrefactoring (diff)
downloadwindows-env-14d1ee026b9f2dded1eb1adc51e50f6b779b4aa4.tar.gz
windows-env-14d1ee026b9f2dded1eb1adc51e50f6b779b4aa4.zip
refactoring
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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
+ ( withPrompt
+ , withoutPrompt
+
+ , engraveBanner
+ , wipeBanner
+ ) where
+
+import Control.Monad (liftM, void, when)
+import Data.Maybe (fromJust, isJust)
+import Data.Char (toLower)
+import System.IO (hFlush, stdout)
+import Text.Printf (printf)
+
+import Environment (Profile, profileKeyPath, VarName, VarValue)
+
+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) "
+
+withPrompt :: String -> IO a -> IO Bool
+withPrompt banner m = do
+ putStr banner
+ hFlush stdout
+ agreed <- promptToContinue
+ when agreed $ void m
+ return agreed
+
+withoutPrompt :: IO a -> IO Bool
+withoutPrompt m = m >> return True
+
+engraveBanner :: Profile -> VarName -> Maybe VarValue -> VarValue -> String
+engraveBanner profile name oldValue newValue =
+ header ++ values
+ where
+ header = printf "Saving variable '%s' to '%s'...\n" name (profileKeyPath profile)
+ values = if isJust oldValue
+ then printf "\tOld value: %s\n\tNew value: %s\n" (fromJust oldValue) newValue
+ else printf "\tValue: %s\n" newValue
+
+wipeBanner :: Profile -> VarName -> String
+wipeBanner profile name =
+ printf "Deleting variable '%s' from '%s'...\n" name (profileKeyPath profile)