initial commit

17 files changed, 644 insertions, 0 deletions

diff --git a/AddPath.hs b/AddPath.hs
new file mode 100644
index 0000000..2fc73e8
--- /dev/null
+++ b/AddPath.hs
@@ -0,0 +1,74 @@
+{-
+ - 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"
+  ]
diff --git a/EnvUtils.hs b/EnvUtils.hs
new file mode 100644
index 0000000..7e9bc96
--- /dev/null
+++ b/EnvUtils.hs
@@ -0,0 +1,81 @@
+{-
+ - 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 EnvUtils ( saveToRegistry
+                , saveToRegistryWithPrompt
+                , queryFromRegistry
+                , wipeFromRegistry
+                , wipeFromRegistryWithPrompt
+                , getEnv
+                , splitPaths
+                , joinPaths
+                , RegistryBasedEnvironment ( CurrentUserEnvironment, AllUsersEnvironment ) ) where
+
+import Control.Monad ( liftM, when )
+import Data.List ( intercalate )
+import Data.List.Split ( splitOn )
+import Data.Maybe ( fromMaybe )
+import qualified System.Environment ( lookupEnv )
+import System.IO.Error ( catchIOError, isDoesNotExistError )
+
+import qualified RegUtils
+import qualified Utils ( promptToContinue )
+
+data RegistryBasedEnvironment = CurrentUserEnvironment
+                              | AllUsersEnvironment
+                              deriving (Eq, Show)
+
+registrySubKeyPath :: RegistryBasedEnvironment -> String
+registrySubKeyPath CurrentUserEnvironment = "Environment"
+registrySubKeyPath AllUsersEnvironment = "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"
+
+registryKey CurrentUserEnvironment = RegUtils.hkcu
+registryKey AllUsersEnvironment = RegUtils.hklm
+
+registryKeyPath :: RegistryBasedEnvironment -> String
+registryKeyPath CurrentUserEnvironment = "HKCU\\" ++ registrySubKeyPath CurrentUserEnvironment
+registryKeyPath AllUsersEnvironment = "HKLM\\" ++ registrySubKeyPath AllUsersEnvironment
+
+saveToRegistry :: RegistryBasedEnvironment -> String -> String -> IO ()
+saveToRegistry env = RegUtils.setString (registryKey env) (registrySubKeyPath env)
+
+saveToRegistryWithPrompt :: RegistryBasedEnvironment -> String -> String -> IO ()
+saveToRegistryWithPrompt env name value = do
+  putStrLn $ "Saving variable '" ++ name ++ "' to '" ++ registryKeyPath env ++ "'..."
+  oldValue <- queryFromRegistry env name
+  putStrLn $ "\tOld value: " ++ oldValue
+  putStrLn $ "\tNew value: " ++ value
+  agreed <- Utils.promptToContinue
+  when agreed $ saveToRegistry env name value
+
+queryFromRegistry :: RegistryBasedEnvironment -> String -> IO String
+queryFromRegistry env name = catchIOError (RegUtils.getString (registryKey env) (registrySubKeyPath env) name) emptyIfDoesNotExist
+  where
+    emptyIfDoesNotExist :: IOError -> IO String
+    emptyIfDoesNotExist e = if isDoesNotExistError e then return "" else ioError e
+
+wipeFromRegistry :: RegistryBasedEnvironment -> String -> IO ()
+wipeFromRegistry env name = catchIOError (RegUtils.delValue (registryKey env) (registrySubKeyPath env) name) ignoreIfDoesNotExist
+  where
+    ignoreIfDoesNotExist :: IOError -> IO ()
+    ignoreIfDoesNotExist e = if isDoesNotExistError e then return () else ioError e
+
+wipeFromRegistryWithPrompt :: RegistryBasedEnvironment -> String -> IO ()
+wipeFromRegistryWithPrompt env name = do
+  putStrLn $ "Deleting variable '" ++ name ++ "' from '" ++ registryKeyPath env ++ "'..."
+  agreed <- Utils.promptToContinue
+  when agreed $ wipeFromRegistry env name
+
+getEnv :: String -> IO String
+getEnv = liftM (fromMaybe "") . System.Environment.lookupEnv
+
+pathSep = ";"
+
+splitPaths :: String -> [String]
+splitPaths = filter (not . null) . splitOn pathSep
+
+joinPaths :: [String] -> String
+joinPaths = intercalate pathSep . filter (not . null)
diff --git a/FixNtSymbolPath.hs b/FixNtSymbolPath.hs
new file mode 100644
index 0000000..404dc77
--- /dev/null
+++ b/FixNtSymbolPath.hs
@@ -0,0 +1,51 @@
+{-
+ - 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 ( unless )
+import System.Directory ( createDirectoryIfMissing, getCurrentDirectory )
+import System.FilePath ( combine )
+
+import qualified EnvUtils
+
+getRemoteSymbolsDirectoryPath :: IO String
+getRemoteSymbolsDirectoryPath = do
+  localPath <- getLocalPath
+  createDirectoryIfMissing True localPath
+  return $ "SRV*" ++ localPath ++ "*" ++ remotePath
+    where
+      getLocalPath :: IO String
+      getLocalPath = do
+        cwd <- getCurrentDirectory
+        return $ combine cwd "symbols"
+      remotePath :: String
+      remotePath = "http://msdl.microsoft.com/download/symbols"
+
+getPdbsDirectoryPath :: IO String
+getPdbsDirectoryPath = do
+  cwd <- getCurrentDirectory
+  let path = combine cwd "pdbs"
+  createDirectoryIfMissing True path
+  return path
+
+fixNtSymbolPath :: IO ()
+fixNtSymbolPath = do
+  let env = EnvUtils.CurrentUserEnvironment
+  val <- EnvUtils.queryFromRegistry env ntSymbolPath
+  let presentPaths = EnvUtils.splitPaths val
+  remoteSymbolsPath <- getRemoteSymbolsDirectoryPath
+  pdbsPath <- getPdbsDirectoryPath
+  let requiredPaths = [pdbsPath, remoteSymbolsPath]
+  let missingPaths = filter (`notElem` presentPaths) requiredPaths
+  unless (null missingPaths) $ do
+    let newval = EnvUtils.joinPaths $ presentPaths ++ missingPaths
+    EnvUtils.saveToRegistry env ntSymbolPath newval
+  where
+    ntSymbolPath = "_NT_SYMBOL_PATH"
+
+main :: IO ()
+main = fixNtSymbolPath
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..fbbdd68
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/ListPath.hs b/ListPath.hs
new file mode 100644
index 0000000..6c1fcfa
--- /dev/null
+++ b/ListPath.hs
@@ -0,0 +1,72 @@
+{-
+ - 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 System.Console.GetOpt
+import System.Directory ( doesDirectoryExist )
+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
+        [] -> listPath options
+        _ -> invalidNumberOfArguments
+    (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+
+listPath :: Options -> IO ()
+listPath options = do
+  val <- EnvUtils.getEnv $ name options
+  mapM_ printPath $ EnvUtils.splitPaths val
+    where
+      printPath p = do
+        exists <- doesDirectoryExist p
+        putStrLn $ (if exists then "+" else "-") ++ " " ++ p
+
+data Options = Options { name :: String } deriving (Eq, Show)
+
+defaultOptions :: Options
+defaultOptions = Options { name = "PATH" }
+
+buildHelpMessage :: IO String
+buildHelpMessage = 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
+
+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 "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+  ]
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3d0f841
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+# wintmp
+
+A collection of scripts to manage my environmental variables, created mainly to:
+
+* learn a bit of Haskell,
+* make it easier to add paths to the PATH variable, automatically setup _NT_SYMBOL_PATH, etc.
+
+## Licensing
+
+This project, including all of the files and their contents, is licensed under the terms of the MIT License.
+See LICENSE.txt for details.
diff --git a/RegUtils.hs b/RegUtils.hs
new file mode 100644
index 0000000..677e4f8
--- /dev/null
+++ b/RegUtils.hs
@@ -0,0 +1,78 @@
+{-
+ - 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 RegUtils ( delValue
+                , getString
+                , hkcu
+                , hklm
+                , setString ) where
+
+import Control.Exception ( bracket )
+import Data.Maybe ( fromMaybe )
+import Foreign.C.String ( peekCWString, withCWString )
+import Foreign.ForeignPtr ( withForeignPtr )
+import Foreign.Marshal.Alloc ( alloca, allocaBytes )
+import Foreign.Ptr ( castPtr, plusPtr )
+import Foreign.Storable ( peek, poke, sizeOf )
+import System.IO.Error ( mkIOError, doesNotExistErrorType )
+import System.Win32.Types
+import System.Win32.Registry
+
+getType :: HKEY -> String -> String -> IO (Maybe RegValueType)
+getType key subKeyPath valueName =
+  bracket (regOpenKey key subKeyPath) regCloseKey $ \key ->
+  withForeignPtr key $ \keyPtr ->
+  withCWString valueName $ \valueNamePtr ->
+  alloca $ \typePtr -> do
+    ret <- c_RegQueryValueEx keyPtr valueNamePtr nullPtr typePtr nullPtr nullPtr
+    case ret of
+      0x0 -> do
+        type' <- peek typePtr
+        return $ Just type'
+      0x2 -> return Nothing
+      _   -> failWith "RegQueryValueEx" ret
+
+getString :: HKEY -> String -> String -> IO String
+getString key subKeyPath valueName =
+  bracket (regOpenKey key subKeyPath) regCloseKey $ \key ->
+  withForeignPtr key $ \keyPtr ->
+  withCWString valueName $ \valueNamePtr ->
+  alloca $ \dataSizePtr -> do
+    poke dataSizePtr 0
+    ret <- c_RegQueryValueEx keyPtr valueNamePtr nullPtr nullPtr nullPtr dataSizePtr
+    case ret of
+      0x0 -> do
+        dataSize <- peek dataSizePtr
+        let newDataSize = dataSize + fromIntegral (sizeOf (undefined :: TCHAR))
+        poke dataSizePtr newDataSize
+        allocaBytes (fromIntegral newDataSize) $ \dataPtr -> do
+          poke (castPtr $ plusPtr dataPtr $ fromIntegral dataSize) '\0'
+          failUnlessSuccess "RegQueryValueEx" $
+            c_RegQueryValueEx keyPtr valueNamePtr nullPtr nullPtr dataPtr dataSizePtr
+          peekCWString $ castPtr dataPtr
+      0x2 -> ioError $ mkIOError doesNotExistErrorType "RegQueryValueEx" Nothing $ Just (subKeyPath ++ "\\" ++ valueName)
+      _   -> failWith "RegQueryValueEx" ret
+
+setString :: HKEY -> String -> String -> String -> IO ()
+setString key subKeyPath valueName valueValue =
+  bracket (regOpenKey key subKeyPath) regCloseKey $ \subKey ->
+  withTStringLen valueValue $ \(ptr, len) -> do
+    type' <- getType key subKeyPath valueName
+    regSetValueEx subKey valueName (fromMaybe rEG_SZ type') ptr $ len * sizeOf (undefined :: TCHAR)
+
+delValue :: HKEY -> String -> String -> IO ()
+delValue key subKeyPath valueName =
+  bracket (regOpenKey key subKeyPath) regCloseKey $ \subKey ->
+  withForeignPtr subKey $ \subKeyPtr ->
+  withCWString valueName $ \valueNamePtr -> do
+    ret <- c_RegDeleteValue subKeyPtr valueNamePtr
+    case ret of
+      0x0 -> return ()
+      0x2 -> ioError $ mkIOError doesNotExistErrorType "RegQueryValueEx" Nothing $ Just (subKeyPath ++ "\\" ++ valueName)
+      _   -> failWith "RegDeleteValue" ret
+
+hkcu = hKEY_CURRENT_USER
+hklm = hKEY_LOCAL_MACHINE
diff --git a/RemovePath.hs b/RemovePath.hs
new file mode 100644
index 0000000..50c4ca2
--- /dev/null
+++ b/RemovePath.hs
@@ -0,0 +1,84 @@
+{-
+ - 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"
+  ]
diff --git a/SetEnv.hs b/SetEnv.hs
new file mode 100644
index 0000000..30f5b1e
--- /dev/null
+++ b/SetEnv.hs
@@ -0,0 +1,66 @@
+{-
+ - 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 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
+        [name, value] -> setEnv name value options
+        _ -> invalidNumberOfArguments
+    (_, _, errorMessages) ->
+      exitWithUsageErrors errorMessages
+
+setEnv :: String -> String -> Options -> IO ()
+setEnv name value options = EnvUtils.saveToRegistryWithPrompt (env options) name value
+
+data Options = Options { env :: EnvUtils.RegistryBasedEnvironment } deriving (Eq, Show)
+
+defaultOptions :: Options
+defaultOptions = Options { 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...] NAME VALUE\nOptions:"
+
+exitWithHelpMessage :: Options -> IO a
+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 "g" ["global"] (NoArg $ \opts -> return opts { env = EnvUtils.AllUsersEnvironment }) "save under the registry key for all users",
+    Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+  ]
diff --git a/UnsetEnv.hs b/UnsetEnv.hs
new file mode 100644
index 0000000..9740c0d
--- /dev/null
+++ b/UnsetEnv.hs
@@ -0,0 +1,65 @@
+{-
+ - 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 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
+        [name] -> unsetEnv name options
+        _ -> invalidNumberOfArguments
+    (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+
+unsetEnv :: String -> Options -> IO ()
+unsetEnv name options = EnvUtils.wipeFromRegistryWithPrompt (env options) name
+
+data Options = Options { env :: EnvUtils.RegistryBasedEnvironment } deriving (Eq, Show)
+
+defaultOptions :: Options
+defaultOptions = Options { 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...] NAME\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 "g" ["global"] (NoArg $ \opts -> return opts { env = EnvUtils.AllUsersEnvironment }) "delete from the registry key for all users",
+    Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+  ]
diff --git a/Utils.hs b/Utils.hs
new file mode 100644
index 0000000..21ee67b
--- /dev/null
+++ b/Utils.hs
@@ -0,0 +1,32 @@
+{-
+ - 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 Utils where
+
+import Control.Monad ( liftM )
+import Data.Char ( toLower )
+import System.IO ( hFlush, stdout )
+
+prompt :: String -> IO String
+prompt banner = do
+  putStr banner
+  hFlush stdout
+  getLine
+
+promptYesNo :: String -> IO Bool
+promptYesNo banner = do
+  response <- liftM (map toLower) $ prompt banner
+  if response `elem` yeses
+    then return True
+    else if response `elem` noes
+      then return False
+      else promptToContinue
+  where
+    yeses = ["y", "yes"]
+    noes = ["n", "no"]
+
+promptToContinue :: IO Bool
+promptToContinue = promptYesNo "Continue? (y/n) "
diff --git a/pdbs/.gitignore b/pdbs/.gitignore
new file mode 100644
index 0000000..eadd157
--- /dev/null
+++ b/pdbs/.gitignore
@@ -0,0 +1 @@
+*.pdb
diff --git a/pdbs/README b/pdbs/README
new file mode 100644
index 0000000..43a9584
--- /dev/null
+++ b/pdbs/README
@@ -0,0 +1 @@
+I store my .pdb files in this directory
diff --git a/symbols/.gitignore b/symbols/.gitignore
new file mode 100644
index 0000000..f8eecb8
--- /dev/null
+++ b/symbols/.gitignore
@@ -0,0 +1,2 @@
+*.pdb/
+pingme.txt
diff --git a/symbols/README b/symbols/README
new file mode 100644
index 0000000..25ad431
--- /dev/null
+++ b/symbols/README
@@ -0,0 +1 @@
+Downloaded Windows symbols are stored in this directory
diff --git a/vscache/.gitignore b/vscache/.gitignore
new file mode 100644
index 0000000..514e47a
--- /dev/null
+++ b/vscache/.gitignore
@@ -0,0 +1,3 @@
+*
+!.gitignore
+!README
diff --git a/vscache/README b/vscache/README
new file mode 100644
index 0000000..703fb3d
--- /dev/null
+++ b/vscache/README
@@ -0,0 +1 @@
+This directory is used as the fallback location for Visual Studio cache files