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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 (when)
import Data.List (union)
import Data.Maybe (fromMaybe)
import Options.Applicative
import qualified Environment
data Options = Options
{ optName :: String
, optGlobal :: Bool
, optPaths :: [String]
} deriving (Eq, Show)
options :: Parser Options
options = Options
<$> optNameDesc
<*> optGlobalDesc
<*> optPathsDesc
where
optNameDesc = strOption $
long "name" <> short 'n' <> metavar "NAME" <> value "PATH" <>
help "Specify variable name ('PATH' by default)"
optGlobalDesc = switch $
long "global" <> short 'g' <>
help "Whether to add for all users"
optPathsDesc = many $ argument str $
metavar "PATH" <>
help "Directory path(s)"
main :: IO ()
main = execParser parser >>= addPath
where
parser = info (helper <*> options) $
fullDesc <> progDesc "Add directories to your PATH"
addPath :: Options -> IO ()
addPath options = do
oldValue <- Environment.query env varName
let oldPaths = Environment.pathSplit $ fromMaybe "" oldValue
let newPaths = union oldPaths pathsToAdd
when (length oldPaths /= length newPaths) $ do
let newValue = Environment.pathJoin newPaths
Environment.engraveWithPrompt env varName newValue
where
env | optGlobal options = Environment.AllUsers
| otherwise = Environment.CurrentUser
varName = optName options
pathsToAdd = optPaths options
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