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diff --git a/AddPath.hs b/AddPath.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] -> addPath path options
+        _ -> invalidNumberOfArguments
+    (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+
+addPath :: String -> Options -> IO ()
+addPath path options = do
+  oldVal <- EnvUtils.getEnv $ name options
+  when (notElem path $ EnvUtils.splitPaths oldVal) $ do
+    oldValFromReg <- EnvUtils.queryFromRegistry (env options) (name options)
+    EnvUtils.saveToRegistryWithPrompt (env options) (name options) $ EnvUtils.joinPaths [path,oldValFromReg]
+
+data Options = Options { name :: String
+                       , env :: EnvUtils.RegistryBasedEnvironment }
+                       deriving (Eq, Show)
+
+defaultOptions :: Options
+defaultOptions = Options { name = "PATH"
+                         , env = EnvUtils.CurrentUserEnvironment }
+
+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 { env = EnvUtils.AllUsersEnvironment }) "add the path for all users",
+    Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+  ]