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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 (filterM, liftM)
import Data.Maybe (fromMaybe)
import System.Directory (doesDirectoryExist)
import System.Environment (lookupEnv)
import Options.Applicative
import qualified Windows.Environment as Env
data WhichPaths = All | ExistingOnly | MissingOnly
deriving (Eq, Show)
shouldListPath :: WhichPaths -> Env.VarValue -> IO Bool
shouldListPath All = return . const True
shouldListPath ExistingOnly = doesDirectoryExist
shouldListPath MissingOnly = liftM not . doesDirectoryExist
data Options = Options
{ optName :: Env.VarName
, optWhichPaths :: WhichPaths
} deriving (Eq, Show)
optionParser :: Parser Options
optionParser = Options <$> optNameDesc <*> optWhichPathsDesc
where
optNameDesc = strOption $
long "name" <> short 'n' <> metavar "NAME" <> value "PATH" <>
help "Variable name ('PATH' by default)"
optWhichPathsDesc = pure All
<|> flag' ExistingOnly (long "existing" <> short 'e'
<> help "List existing paths only")
<|> flag' MissingOnly (long "missing" <> short 'm'
<> help "List missing paths only")
main :: IO ()
main = execParser parser >>= listPath
where
parser = info (helper <*> optionParser) $
fullDesc <> progDesc "List directories in your PATH"
listPath :: Options -> IO ()
listPath options = do
oldValue <- query
printPaths $ Env.pathSplit oldValue
where
varName = optName options
whichPaths = optWhichPaths options
query = liftM (fromMaybe "") $ lookupEnv varName
printPaths paths =
filterM (shouldListPath whichPaths) paths >>= mapM_ putStrLn
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