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authorEgor Tensin <Egor.Tensin@gmail.com>2017-03-25 05:56:02 +0300
committerEgor Tensin <Egor.Tensin@gmail.com>2017-03-25 05:56:02 +0300
commit80f6847645459dfd21e531946e1eeaf2384a2dff (patch)
tree8a93e818fe647974bd724be08092e9475d03425f /apps/AddPath.hs
parentadd README to the package (diff)
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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 (void, when)
-import Control.Monad.Trans.Except (catchE, runExceptT, throwE)
-import Data.List (union)
-import System.IO.Error (ioError, isDoesNotExistError)
-
-import Options.Applicative
-
-import qualified WindowsEnv
-
-import Prompt
-import PromptMessage
-
-data Options = Options
- { optName :: WindowsEnv.VarName
- , optYes :: Bool
- , optGlobal :: Bool
- , optPaths :: [WindowsEnv.VarValue]
- } deriving (Eq, Show)
-
-optionParser :: Parser Options
-optionParser = 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 <*> optionParser) $
- fullDesc <> progDesc "Add directories to your PATH"
-
-addPath :: Options -> IO ()
-addPath options = runExceptT doAddPath >>= either ioError return
- where
- varName = optName options
- pathsToAdd = optPaths options
-
- forAllUsers = optGlobal options
- profile
- | forAllUsers = WindowsEnv.AllUsers
- | otherwise = WindowsEnv.CurrentUser
-
- skipPrompt = optYes options
-
- emptyIfMissing e
- | isDoesNotExistError e = return ""
- | otherwise = throwE e
-
- doAddPath = do
- oldValue <- WindowsEnv.query profile varName `catchE` emptyIfMissing
- let oldPaths = WindowsEnv.pathSplit oldValue
- let newPaths = oldPaths `union` pathsToAdd
- when (length oldPaths /= length newPaths) $ do
- let newValue = WindowsEnv.pathJoin newPaths
- let promptAnd = if skipPrompt
- then withoutPrompt
- else withPrompt $ oldNewMessage profile varName oldValue newValue
- let engrave = WindowsEnv.engrave profile varName newValue
- void $ promptAnd engrave