code style

6 files changed, 215 insertions, 206 deletions

diff --git a/apps/AddPath.hs b/apps/AddPath.hs
index 558c23c..e3f8ec3 100644
--- a/apps/AddPath.hs
+++ b/apps/AddPath.hs
@@ -4,73 +4,76 @@
  - See LICENSE.txt for details.
 -}
 
-module Main ( main ) where
+module Main (main) where
 
-import Control.Monad ( mapM_, when )
+import Control.Monad (mapM_, 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
-      addPath args options
-    (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+    rawArgs <- getArgs
+    case getOpt Permute optionDescription rawArgs of
+        (actions, args, []) -> do
+            options <- foldl (>>=) (return defaultOptions) actions
+            addPath args options
+        (_, _, errorMessages) -> exitWithUsageErrors errorMessages
 
 addPath :: [String] -> Options -> IO ()
 addPath paths options = do
-  missingPaths <- dropIncludedPaths paths
-  when (not $ null missingPaths) $ do
-    oldPath <- Environment.queryFromRegistry (env options) (name options)
-    Environment.saveToRegistryWithPrompt (env options) (name options) $ Environment.joinPaths $ missingPaths ++ [oldPath]
-      where
-        dropIncludedPaths paths = do
-          currentPath <- Environment.getEnv $ name options
-          return $ filter (flip notElem $ Environment.splitPaths currentPath) paths
+    missingPaths <- dropIncludedPaths paths
+    when (not $ null missingPaths) $ do
+        oldPath <- Environment.queryFromRegistry (env options) (name options)
+        Environment.saveToRegistryWithPrompt (env options) (name options) $ Environment.joinPaths $ missingPaths ++ [oldPath]
+  where
+    dropIncludedPaths paths = do
+        currentPath <- Environment.getEnv $ name options
+        return $ filter (flip notElem $ Environment.splitPaths currentPath) paths
 
-data Options = Options { name :: String
-                       , env :: Environment.RegistryBasedEnvironment }
-                       deriving (Eq, Show)
+data Options = Options
+    { name :: String
+    , env :: Environment.RegistryBasedEnvironment
+    } deriving (Eq, Show)
 
 defaultOptions :: Options
-defaultOptions = Options { name = "PATH"
-                         , env = Environment.CurrentUserEnvironment }
+defaultOptions = Options
+    { name = "PATH"
+    , env = Environment.CurrentUserEnvironment
+    }
 
 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 :: IO String
+    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 { env = Environment.AllUsersEnvironment }) "add 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 { env = Environment.AllUsersEnvironment }) "add the path for all users"
+    , Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+    ]
diff --git a/apps/FixNtSymbolPath.hs b/apps/FixNtSymbolPath.hs
index 9a02cf9..c75291e 100644
--- a/apps/FixNtSymbolPath.hs
+++ b/apps/FixNtSymbolPath.hs
@@ -4,46 +4,44 @@
  - See LICENSE.txt for details.
 -}
 
-module Main ( main ) where
+module Main (main) where
 
-import Control.Monad ( unless )
-import System.Directory ( createDirectoryIfMissing, getCurrentDirectory )
-import System.FilePath ( combine )
+import Control.Monad (unless)
+import System.Directory (createDirectoryIfMissing, getCurrentDirectory)
+import System.FilePath (combine)
 
 import qualified Environment
 
 getRemoteSymbolsDirectoryPath :: IO String
 getRemoteSymbolsDirectoryPath = do
-  localPath <- getLocalPath
-  createDirectoryIfMissing True localPath
-  return $ "SRV*" ++ localPath ++ "*" ++ remotePath
-    where
-      getLocalPath :: IO String
-      getLocalPath = do
+    localPath <- getLocalPath
+    createDirectoryIfMissing True localPath
+    return $ "SRV*" ++ localPath ++ "*" ++ remotePath
+  where
+    getLocalPath = do
         cwd <- getCurrentDirectory
         return $ combine cwd "symbols"
-      remotePath :: String
-      remotePath = "http://msdl.microsoft.com/download/symbols"
+    remotePath = "http://msdl.microsoft.com/download/symbols"
 
 getPdbsDirectoryPath :: IO String
 getPdbsDirectoryPath = do
-  cwd <- getCurrentDirectory
-  let path = combine cwd "pdbs"
-  createDirectoryIfMissing True path
-  return path
+    cwd <- getCurrentDirectory
+    let path = combine cwd "pdbs"
+    createDirectoryIfMissing True path
+    return path
 
 fixNtSymbolPath :: IO ()
 fixNtSymbolPath = do
-  let env = Environment.CurrentUserEnvironment
-  val <- Environment.queryFromRegistry env ntSymbolPath
-  let presentPaths = Environment.splitPaths val
-  remoteSymbolsPath <- getRemoteSymbolsDirectoryPath
-  pdbsPath <- getPdbsDirectoryPath
-  let requiredPaths = [pdbsPath, remoteSymbolsPath]
-  let missingPaths = filter (`notElem` presentPaths) requiredPaths
-  unless (null missingPaths) $ do
-    let newval = Environment.joinPaths $ presentPaths ++ missingPaths
-    Environment.saveToRegistry env ntSymbolPath newval
+    let env = Environment.CurrentUserEnvironment
+    val <- Environment.queryFromRegistry env ntSymbolPath
+    let presentPaths = Environment.splitPaths val
+    remoteSymbolsPath <- getRemoteSymbolsDirectoryPath
+    pdbsPath <- getPdbsDirectoryPath
+    let requiredPaths = [pdbsPath, remoteSymbolsPath]
+    let missingPaths = filter (`notElem` presentPaths) requiredPaths
+    unless (null missingPaths) $ do
+        let newval = Environment.joinPaths $ presentPaths ++ missingPaths
+        Environment.saveToRegistry env ntSymbolPath newval
   where
     ntSymbolPath = "_NT_SYMBOL_PATH"
 
diff --git a/apps/ListPath.hs b/apps/ListPath.hs
index 75f1b27..b964998 100644
--- a/apps/ListPath.hs
+++ b/apps/ListPath.hs
@@ -4,33 +4,33 @@
  - See LICENSE.txt for details.
 -}
 
-module Main ( main ) where
+module Main (main) where
 
 import System.Console.GetOpt
-import System.Directory ( doesDirectoryExist )
-import System.Environment ( getArgs, getProgName )
-import System.Exit ( exitFailure, exitSuccess )
-import System.IO ( hPutStr, stderr )
+import System.Directory (doesDirectoryExist)
+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
-      case args of
-        [] -> listPath options
-        _ -> invalidNumberOfArguments
-    (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+    rawArgs <- getArgs
+    case getOpt Permute optionDescription rawArgs of
+        (actions, args, []) -> do
+            options <- foldl (>>=) (return defaultOptions) actions
+            case args of
+                [] -> listPath options
+                _ -> invalidNumberOfArguments
+        (_, _, errorMessages) -> exitWithUsageErrors errorMessages
 
 listPath :: Options -> IO ()
 listPath options = do
-  val <- Environment.getEnv $ name options
-  mapM_ printPath $ Environment.splitPaths val
-    where
-      printPath p = do
+    val <- Environment.getEnv $ name options
+    mapM_ printPath $ Environment.splitPaths val
+  where
+    printPath p = do
         exists <- doesDirectoryExist p
         putStrLn $ (if exists then "+" else "-") ++ " " ++ p
 
@@ -41,32 +41,32 @@ defaultOptions = Options { name = "PATH" }
 
 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 :: IO String
+    buildHeader = do
         progName <- getProgName
         return $ "Usage: " ++ progName ++ " [OPTIONS...]\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 "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 "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+    ]
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"
+    ]
diff --git a/apps/SetEnv.hs b/apps/SetEnv.hs
index fda9726..f27be4e 100644
--- a/apps/SetEnv.hs
+++ b/apps/SetEnv.hs
@@ -4,63 +4,66 @@
  - See LICENSE.txt for details.
 -}
 
-module Main ( main ) where
+module Main (main) where
 
 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
-      case args of
-        [name, value] -> setEnv name value options
-        _ -> invalidNumberOfArguments
-    (_, _, errorMessages) ->
-      exitWithUsageErrors errorMessages
+    rawArgs <- getArgs
+    case getOpt Permute optionDescription rawArgs of
+        (actions, args, []) -> do
+            options <- foldl (>>=) (return defaultOptions) actions
+            case args of
+                [name, value] -> setEnv name value options
+                _ -> invalidNumberOfArguments
+        (_, _, errorMessages) ->
+            exitWithUsageErrors errorMessages
 
 setEnv :: String -> String -> Options -> IO ()
 setEnv name value options = Environment.saveToRegistryWithPrompt (env options) name value
 
-data Options = Options { env :: Environment.RegistryBasedEnvironment } deriving (Eq, Show)
+data Options = Options
+    { env :: Environment.RegistryBasedEnvironment
+    } deriving (Eq, Show)
 
 defaultOptions :: Options
-defaultOptions = Options { env = Environment.CurrentUserEnvironment }
+defaultOptions = Options
+    { env = Environment.CurrentUserEnvironment
+    }
 
 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...] NAME VALUE\nOptions:"
 
 exitWithHelpMessage :: Options -> IO a
 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 "g" ["global"] (NoArg $ \opts -> return opts { env = Environment.AllUsersEnvironment }) "save under the registry key for all users",
-    Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
-  ]
+optionDescription =
+    [ Option "g" ["global"] (NoArg $ \opts -> return opts { env = Environment.AllUsersEnvironment }) "save under the registry key for all users"
+    , Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+    ]
diff --git a/apps/UnsetEnv.hs b/apps/UnsetEnv.hs
index 254f383..32626f3 100644
--- a/apps/UnsetEnv.hs
+++ b/apps/UnsetEnv.hs
@@ -4,62 +4,65 @@
  - See LICENSE.txt for details.
 -}
 
-module Main ( main ) where
+module Main (main) where
 
 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
-      case args of
-        [name] -> unsetEnv name options
-        _ -> invalidNumberOfArguments
-    (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+    rawArgs <- getArgs
+    case getOpt Permute optionDescription rawArgs of
+        (actions, args, []) -> do
+            options <- foldl (>>=) (return defaultOptions) actions
+            case args of
+                [name] -> unsetEnv name options
+                _ -> invalidNumberOfArguments
+        (_, _, errorMessages) -> exitWithUsageErrors errorMessages
 
 unsetEnv :: String -> Options -> IO ()
 unsetEnv name options = Environment.wipeFromRegistryWithPrompt (env options) name
 
-data Options = Options { env :: Environment.RegistryBasedEnvironment } deriving (Eq, Show)
+data Options = Options
+    { env :: Environment.RegistryBasedEnvironment
+    } deriving (Eq, Show)
 
 defaultOptions :: Options
-defaultOptions = Options { env = Environment.CurrentUserEnvironment }
+defaultOptions = Options
+    { env = Environment.CurrentUserEnvironment
+    }
 
 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...] NAME\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 "g" ["global"] (NoArg $ \opts -> return opts { env = Environment.AllUsersEnvironment }) "delete from the registry key for all users",
-    Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
-  ]
+optionDescription =
+    [ Option "g" ["global"] (NoArg $ \opts -> return opts { env = Environment.AllUsersEnvironment }) "delete from the registry key for all users"
+    , Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+    ]