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|
-- |
-- Copyright : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
-- License : MIT
-- Maintainer : Egor.Tensin@gmail.com
-- Stability : experimental
module Main (main) where
import Control.Monad (void)
import Control.Monad.Trans.Class
import Control.Monad.Trans.Except
import System.IO.Error (ioError)
import Options.Applicative
import qualified Windows.Environment as Env
import Prompt
import PromptMessage
data Options = Options
{ optYes :: Bool
, optGlobal :: Bool
, optName :: Env.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 "Unset environment variables"
unsetEnv :: Options -> IO ()
unsetEnv options = do
ret <- runExceptT $ lift $ void $ promptAnd $ runExceptT wipe
either ioError return ret
where
varName = optName options
forAllUsers = optGlobal options
profile
| forAllUsers = Env.AllUsers
| otherwise = Env.CurrentUser
skipPrompt = optYes options
promptAnd
| skipPrompt = withoutPrompt
| otherwise = withPrompt $ wipeMessage profile varName
wipe = Env.wipe profile varName
|
