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diff --git a/bin/UnsetEnv.hs b/bin/UnsetEnv.hs
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+-- |
+-- Copyright : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+-- License : MIT
+-- Maintainer : Egor.Tensin@gmail.com
+-- Stability : experimental
+-- Portability : Windows-only
+
+module Main (main) where
+
+import Control.Monad (void)
+import Control.Monad.Trans.Except (runExceptT)
+import System.IO.Error (ioError)
+
+import Options.Applicative
+
+import qualified WindowsEnv
+
+import Prompt
+import PromptMessage
+
+data Options = Options
+ { optYes :: Bool
+ , optGlobal :: Bool
+ , optName :: WindowsEnv.VarName
+ } deriving (Eq, Show)
+
+optionParser :: Parser Options
+optionParser = Options
+ <$> optYesDesc
+ <*> optGlobalDesc
+ <*> optNameDesc
+ where
+ optYesDesc = switch
+ $ long "yes" <> short 'y'
+ <> help "Skip confirmation prompt"
+ optGlobalDesc = switch
+ $ long "global" <> short 'g'
+ <> help "Unset for all users"
+ optNameDesc = argument str
+ $ metavar "NAME"
+ <> help "Variable name"
+
+main :: IO ()
+main = execParser parser >>= unsetEnv
+ where
+ parser = info (helper <*> optionParser) $
+ fullDesc <> progDesc "Delete environment variables"
+
+unsetEnv :: Options -> IO ()
+unsetEnv options = runExceptT doUnsetEnv >>= either ioError return
+ where
+ varName = optName options
+
+ forAllUsers = optGlobal options
+ profile
+ | forAllUsers = WindowsEnv.AllUsers
+ | otherwise = WindowsEnv.CurrentUser
+
+ skipPrompt = optYes options
+ promptAnd
+ | skipPrompt = withoutPrompt
+ | otherwise = withPrompt $ wipeMessage profile varName
+
+ wipe = WindowsEnv.wipe profile varName
+
+ doUnsetEnv = void $ promptAnd wipe