blob: e0cbefe3c5248478bf3a9bfa09f99abb043d350f (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
{-
- 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
{ optName :: String
} deriving (Eq, Show)
options :: Parser Options
options = Options <$> optNameDesc
where
optNameDesc = strOption $
long "name" <> short 'n' <> metavar "NAME" <> value "PATH" <>
help "Variable name ('PATH' by default)"
main :: IO ()
main = execParser parser >>= listPath
where
parser = info (helper <*> options) $
fullDesc <> progDesc "List directories in your PATH"
listPath :: Options -> IO ()
listPath options = do
oldValue <- getEnv varName
let oldPaths = Environment.pathSplit oldValue
mapM_ printPath oldPaths
where
varName = optName options
getEnv = liftM (fromMaybe "") . lookupEnv
printPath p = do
exists <- doesDirectoryExist p
putStrLn $ (if exists then "+" else "-") ++ " " ++ p
|
