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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.Environment (lookupEnv)
import System.IO.Error (ioError)
import Options.Applicative
import qualified WindowsEnv
data WhichPaths = All | ExistingOnly | MissingOnly
deriving (Eq, Show)
shouldListPath :: WhichPaths -> WindowsEnv.ExpandedPath -> IO Bool
shouldListPath All = return . const True
shouldListPath ExistingOnly = WindowsEnv.pathExists
shouldListPath MissingOnly = fmap not . WindowsEnv.pathExists
data Source = Environment | Registry WindowsEnv.Profile
deriving (Eq, Show)
data Options = Options
{ optName :: WindowsEnv.Name
, 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
query = queryFrom $ optSource options
queryFrom Environment = lift $ WindowsEnv.Value False
<$> fromMaybe ""
<$> lookupEnv varName
queryFrom (Registry profile) = WindowsEnv.query profile varName
doListPaths = do
varValue <- query
split <- WindowsEnv.pathSplitAndExpand varValue
lift $ do
wanted <- filterM (shouldListPath whichPaths) split
mapM_ (putStrLn . WindowsEnv.pathOriginal) wanted
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