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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 Control.Monad (liftM)
import Data.Maybe (fromMaybe)
import System.Directory (doesDirectoryExist)
import System.Environment (lookupEnv)
import Options.Applicative
import qualified Environment
data Options = Options
{ name :: String
} deriving (Eq, Show)
options :: Parser Options
options = Options <$> nameOption
where
nameOption = strOption $
long "name" <> short 'n' <> metavar "NAME" <> value "PATH" <>
help "Specify variable name ('PATH' by default)"
main :: IO ()
main = execParser parser >>= listPath
where
parser = info (helper <*> options) $
fullDesc <> progDesc "List directories in your PATH"
getEnv :: String -> IO String
getEnv = liftM (fromMaybe "") . lookupEnv
listPath :: Options -> IO ()
listPath options = do
val <- getEnv $ name options
mapM_ printPath $ Environment.pathSplit val
where
printPath p = do
exists <- doesDirectoryExist p
putStrLn $ (if exists then "+" else "-") ++ " " ++ p
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