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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
, optYes :: Bool
, optGlobal :: Bool
, optPaths :: [String]
} deriving (Eq, Show)
options :: Parser Options
options = Options
<$> optNameDesc
<*> optYesDesc
<*> optGlobalDesc
<*> optPathsDesc
where
optNameDesc = strOption $
long "name" <> short 'n' <> metavar "NAME" <> value "PATH" <>
help "Variable name ('PATH' by default)"
optYesDesc = switch $
long "yes" <> short 'y' <>
help "Skip confirmation prompt"
optGlobalDesc = switch $
long "global" <> short 'g' <>
help "Add for all users"
optPathsDesc = many $ argument str $
metavar "PATH" <>
help "Directories to add"
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 <- query
let oldPaths = Environment.pathSplit $ fromMaybe "" oldValue
let newPaths = union oldPaths pathsToAdd
when (length oldPaths /= length newPaths) $ do
let newValue = Environment.pathJoin newPaths
engrave newValue
where
varName = optName options
pathsToAdd = optPaths options
forAllUsers = optGlobal options
env = if forAllUsers
then Environment.AllUsers
else Environment.CurrentUser
query = Environment.query env varName
skipPrompt = optYes options
engrave value = if skipPrompt
then Environment.engrave env varName value
else Environment.engravePrompt env varName value >> return ()
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