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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 Windows.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)
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