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-rw-r--r--apps/RemovePath.hs92
1 files changed, 47 insertions, 45 deletions
diff --git a/apps/RemovePath.hs b/apps/RemovePath.hs
index 3071708..2f73e21 100644
--- a/apps/RemovePath.hs
+++ b/apps/RemovePath.hs
@@ -4,77 +4,79 @@
- See LICENSE.txt for details.
-}
-module Main ( main ) where
+module Main (main) where
-import Control.Monad ( when )
+import Control.Monad (when)
import System.Console.GetOpt
-import System.Environment ( getArgs, getProgName )
-import System.Exit ( exitFailure, exitSuccess )
-import System.IO ( hPutStr, stderr )
+import System.Environment (getArgs, getProgName)
+import System.Exit (exitFailure, exitSuccess)
+import System.IO (hPutStr, stderr)
import qualified Environment
main :: IO ()
main = do
- rawArgs <- getArgs
- case getOpt Permute optionDescription rawArgs of
- (actions, args, []) -> do
- options <- foldl (>>=) (return defaultOptions) actions
- removePath args options
- (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+ rawArgs <- getArgs
+ case getOpt Permute optionDescription rawArgs of
+ (actions, args, []) -> do
+ options <- foldl (>>=) (return defaultOptions) actions
+ removePath args options
+ (_, _, errorMessages) -> exitWithUsageErrors errorMessages
removePath :: [String] -> Options -> IO ()
removePath paths options = do
- let varName = name options
- userVal <- Environment.queryFromRegistry Environment.CurrentUserEnvironment varName
- let userValParts = Environment.splitPaths userVal
- let newUserValParts = filter (`notElem` paths) userValParts
- when (length userValParts /= length newUserValParts) $ do
- Environment.saveToRegistryWithPrompt Environment.CurrentUserEnvironment varName $ Environment.joinPaths newUserValParts
- when (global options) $ do
- globalVal <- Environment.queryFromRegistry Environment.AllUsersEnvironment varName
- let globalValParts = Environment.splitPaths globalVal
- let newGlobalValParts = filter (`notElem` paths) globalValParts
- when (length globalValParts /= length newGlobalValParts) $ do
- Environment.saveToRegistryWithPrompt Environment.AllUsersEnvironment varName $ Environment.joinPaths newGlobalValParts
+ let varName = name options
+ userVal <- Environment.queryFromRegistry Environment.CurrentUserEnvironment varName
+ let userValParts = Environment.splitPaths userVal
+ let newUserValParts = filter (`notElem` paths) userValParts
+ when (length userValParts /= length newUserValParts) $ do
+ Environment.saveToRegistryWithPrompt Environment.CurrentUserEnvironment varName $ Environment.joinPaths newUserValParts
+ when (global options) $ do
+ globalVal <- Environment.queryFromRegistry Environment.AllUsersEnvironment varName
+ let globalValParts = Environment.splitPaths globalVal
+ let newGlobalValParts = filter (`notElem` paths) globalValParts
+ when (length globalValParts /= length newGlobalValParts) $ do
+ Environment.saveToRegistryWithPrompt Environment.AllUsersEnvironment varName $ Environment.joinPaths newGlobalValParts
-data Options = Options { name :: String
- , global :: Bool }
- deriving (Eq, Show)
+data Options = Options
+ { name :: String
+ , global :: Bool
+ } deriving (Eq, Show)
defaultOptions :: Options
-defaultOptions = Options { name = "PATH"
- , global = False }
+defaultOptions = Options
+ { name = "PATH"
+ , global = False
+ }
buildHelpMessage :: IO String
buildHelpMessage = do
- header <- buildHeader
- return $ usageInfo header optionDescription
- where
- buildHeader :: IO String
- buildHeader = do
+ header <- buildHeader
+ return $ usageInfo header optionDescription
+ where
+ buildHeader = do
progName <- getProgName
return $ "Usage: " ++ progName ++ " [OPTIONS...] [PATH...]\nOptions:"
exitWithHelpMessage :: a -> IO b
exitWithHelpMessage _ = do
- helpMessage <- buildHelpMessage
- putStr helpMessage
- exitSuccess
+ helpMessage <- buildHelpMessage
+ putStr helpMessage
+ exitSuccess
exitWithUsageErrors :: [String] -> IO a
exitWithUsageErrors errorMessages = do
- hPutStr stderr $ concatMap ("Usage error: " ++) errorMessages
- helpMessage <- buildHelpMessage
- hPutStr stderr helpMessage
- exitFailure
+ 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"
- ]
+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"
+ ]