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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 Main (main) where
import Options.Applicative
import qualified Environment
data Options = Options
{ optYes :: Bool
, optGlobal :: Bool
, optName :: String
} deriving (Eq, Show)
options :: Parser Options
options = Options
<$> optYes
<*> optGlobalDesc
<*> optNameDesc
where
optYes = 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 <*> options) $
fullDesc <> progDesc "Unset environment variable"
unsetEnv :: Options -> IO ()
unsetEnv options = wipe
where
varName = optName options
forAllUsers = optGlobal options
env = if forAllUsers
then Environment.AllUsers
else Environment.CurrentUser
skipPrompt = optYes options
wipe = if skipPrompt
then Environment.wipe env varName
else Environment.wipePrompt env varName >> return ()
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