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-rw-r--r--bin/ListPaths.hs84
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diff --git a/bin/ListPaths.hs b/bin/ListPaths.hs
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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 (filterM)
-import Control.Monad.Trans.Class (lift)
-import Control.Monad.Trans.Except (runExceptT)
-import Data.Maybe (fromMaybe)
-import System.Directory (doesDirectoryExist)
-import System.Environment (lookupEnv)
-import System.IO.Error (ioError)
-
-import Options.Applicative
-
-import qualified WindowsEnv
-
-data WhichPaths = All | ExistingOnly | MissingOnly
- deriving (Eq, Show)
-
-shouldListPath :: WhichPaths -> WindowsEnv.VarValue -> IO Bool
-shouldListPath All = return . const True
-shouldListPath ExistingOnly = doesDirectoryExist
-shouldListPath MissingOnly = fmap not . doesDirectoryExist
-
-data Source = Environment | Registry WindowsEnv.Profile
- deriving (Eq, Show)
-
-data Options = Options
- { optName :: WindowsEnv.VarName
- , optWhichPaths :: WhichPaths
- , optSource :: Source
- } deriving (Eq, Show)
-
-optionParser :: Parser Options
-optionParser = Options
- <$> optNameDesc
- <*> optWhichPathsDesc
- <*> optSourceDesc
- where
- optNameDesc = strOption
- $ long "name" <> short 'n'
- <> metavar "NAME" <> value "PATH"
- <> help "Variable name ('PATH' by default)"
- optWhichPathsDesc = pure All
- <|> flag' ExistingOnly (long "existing" <> short 'e'
- <> help "List existing paths only")
- <|> flag' MissingOnly (long "missing" <> short 'm'
- <> help "List missing paths only")
- optSourceDesc = pure Environment
- <|> flag' (Registry WindowsEnv.CurrentUser) (long "user" <> short 'u'
- <> help "List current user's paths only")
- <|> flag' (Registry WindowsEnv.AllUsers) (long "global" <> short 'g'
- <> help "List global (all users') paths only")
-
-main :: IO ()
-main = execParser parser >>= listPaths
- where
- parser = info (helper <*> optionParser) $
- fullDesc <> progDesc "List directories in your PATH"
-
-listPaths :: Options -> IO ()
-listPaths options = runExceptT doListPaths >>= either ioError return
- where
- varName = optName options
- whichPaths = optWhichPaths options
- source = optSource options
-
- query = queryFrom source
-
- queryFrom Environment = lift $ fromMaybe "" <$> lookupEnv varName
- queryFrom (Registry profile) = WindowsEnv.query profile varName
-
- filterPaths = filterM $ shouldListPath whichPaths
-
- doListPaths = do
- paths <- WindowsEnv.pathSplit <$> query
- lift $ do
- pathsToPrint <- filterPaths paths
- mapM_ putStrLn pathsToPrint