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|
-- |
-- Copyright : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
-- License : MIT
-- Maintainer : Egor.Tensin@gmail.com
-- Stability : experimental
-- Portability : Windows-only
module Main (main) where
import Control.Monad (unless, void)
import Control.Monad.Trans.Except (catchE, runExceptT, throwE)
import Data.List ((\\), nub)
import System.IO.Error (ioError, isDoesNotExistError)
import Options.Applicative
import qualified WindowsEnv
import Utils.Prompt
import Utils.PromptMessage
data Options = Options
{ optName :: WindowsEnv.VarName
, optYes :: Bool
, optGlobal :: Bool
, optPrepend :: Bool
, optPaths :: [String]
} deriving (Eq, Show)
optionParser :: Parser Options
optionParser = Options
<$> optNameDesc
<*> optYesDesc
<*> optGlobalDesc
<*> optPrependDesc
<*> 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"
optPrependDesc = switch
$ long "prepend" <> short 'p'
<> help "Prepend to the variable (instead of appending)"
optPathsDesc = many $ argument str
$ metavar "PATH"
<> help "Directories to add"
main :: IO ()
main = execParser parser >>= addPath
where
parser = info (helper <*> optionParser) $
fullDesc <> progDesc "Add directories to your PATH"
addPath :: Options -> IO ()
addPath options = runExceptT doAddPath >>= either ioError return
where
varName = optName options
pathsToAdd = nub $ optPaths options
forAllUsers = optGlobal options
profile
| forAllUsers = WindowsEnv.AllUsers
| otherwise = WindowsEnv.CurrentUser
skipPrompt = optYes options
prepend = optPrepend options
mergePaths old new
| prepend = new ++ old
| otherwise = old ++ new
emptyIfMissing e
| isDoesNotExistError e = defaultValue
| otherwise = throwE e
defaultValue = do
expandedPaths <- mapM WindowsEnv.expand pathsToAdd
if pathsToAdd == expandedPaths
then return $ WindowsEnv.VarValue False ""
else return $ WindowsEnv.VarValue True ""
doAddPath = do
oldValue <- WindowsEnv.query profile varName `catchE` emptyIfMissing
let oldPaths = WindowsEnv.pathSplit $ show oldValue
let newPaths = pathsToAdd \\ oldPaths
unless (null newPaths) $ do
let newValue = WindowsEnv.VarValue (WindowsEnv.varValueExpandable oldValue) $ WindowsEnv.pathJoin (mergePaths oldPaths newPaths)
promptAndEngrave oldValue newValue
promptAndEngrave oldValue newValue = do
let promptAnd = if skipPrompt
then withoutPrompt
else withPrompt $ oldNewMessage profile varName (show oldValue) (show newValue)
let engrave = WindowsEnv.engrave profile varName newValue
void $ promptAnd engrave
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