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-rw-r--r--RemovePath.hs84
1 files changed, 84 insertions, 0 deletions
diff --git a/RemovePath.hs b/RemovePath.hs
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+++ b/RemovePath.hs
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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 System.Console.GetOpt
+import System.Environment ( getArgs, getProgName )
+import System.Exit ( exitFailure, exitSuccess )
+import System.IO ( hPutStr, stderr )
+
+import qualified EnvUtils
+
+main :: IO ()
+main = do
+ rawArgs <- getArgs
+ case getOpt Permute optionDescription rawArgs of
+ (actions, args, []) -> do
+ options <- foldl (>>=) (return defaultOptions) actions
+ case args of
+ [path] -> removePath path options
+ _ -> invalidNumberOfArguments
+ (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+
+removePath :: String -> Options -> IO ()
+removePath path options = do
+ let varName = name options
+ userVal <- EnvUtils.queryFromRegistry EnvUtils.CurrentUserEnvironment varName
+ let userValParts = EnvUtils.splitPaths userVal
+ if path `elem` userValParts
+ then do
+ let newUserValParts = filter (/= path) userValParts
+ EnvUtils.saveToRegistryWithPrompt EnvUtils.CurrentUserEnvironment varName $ EnvUtils.joinPaths newUserValParts
+ else do
+ when (global options) $ do
+ globalVal <- EnvUtils.queryFromRegistry EnvUtils.AllUsersEnvironment varName
+ let globalValParts = EnvUtils.splitPaths globalVal
+ when (path `elem` globalValParts) $ do
+ let newGlobalValParts = filter (/= path) globalValParts
+ EnvUtils.saveToRegistryWithPrompt EnvUtils.AllUsersEnvironment varName $ EnvUtils.joinPaths newGlobalValParts
+
+data Options = Options { name :: String
+ , global :: Bool }
+ deriving (Eq, Show)
+
+defaultOptions :: Options
+defaultOptions = Options { name = "PATH"
+ , global = False }
+
+buildHelpMessage :: IO String
+buildHelpMessage = do
+ header <- buildHeader
+ return $ usageInfo header optionDescription
+ where
+ buildHeader :: IO String
+ buildHeader = do
+ progName <- getProgName
+ return $ "Usage: " ++ progName ++ " [OPTIONS...] PATH\nOptions:"
+
+exitWithHelpMessage :: a -> IO b
+exitWithHelpMessage _ = do
+ helpMessage <- buildHelpMessage
+ putStr helpMessage
+ exitSuccess
+
+exitWithUsageErrors :: [String] -> IO a
+exitWithUsageErrors errorMessages = do
+ hPutStr stderr $ concatMap ("Usage error: " ++) errorMessages
+ helpMessage <- buildHelpMessage
+ hPutStr stderr helpMessage
+ exitFailure
+
+invalidNumberOfArguments :: IO a
+invalidNumberOfArguments = exitWithUsageErrors ["invalid number of arguments\n"]
+
+optionDescription :: [OptDescr (Options -> IO Options)]
+optionDescription = [
+ Option "n" ["name"] (ReqArg (\s opts -> return opts { name = s }) "NAME") "set the variable name ('PATH' by default)",
+ Option "g" ["global"] (NoArg $ \opts -> return opts { global = True }) "remove the path for all users",
+ Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+ ]