diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/EnvUtils.hs | 81 | ||||
| -rw-r--r-- | src/RegUtils.hs | 91 | ||||
| -rw-r--r-- | src/Utils.hs | 32 |
3 files changed, 204 insertions, 0 deletions
diff --git a/src/EnvUtils.hs b/src/EnvUtils.hs new file mode 100644 index 0000000..7e9bc96 --- /dev/null +++ b/src/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/src/RegUtils.hs b/src/RegUtils.hs new file mode 100644 index 0000000..eccb6ad --- /dev/null +++ b/src/RegUtils.hs @@ -0,0 +1,91 @@ +{- + - 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.ForeignPtr ( withForeignPtr ) +import Foreign.Marshal.Alloc ( alloca, allocaBytes ) +import Foreign.Ptr ( castPtr, plusPtr ) +import Foreign.Storable ( peek, poke, sizeOf ) +import Graphics.Win32.Window ( sendMessage ) +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 $ \p_key -> + withTString valueName $ \p_valueName -> + alloca $ \p_type -> do + ret <- c_RegQueryValueEx p_key p_valueName nullPtr p_type nullPtr nullPtr + case ret of + 0x0 -> do + type_ <- peek p_type + 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 $ \p_key -> + withTString valueName $ \p_valueName -> + alloca $ \dataSizePtr -> do + poke dataSizePtr 0 + ret <- c_RegQueryValueEx p_key p_valueName 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 p_key p_valueName nullPtr nullPtr dataPtr dataSizePtr + peekTString $ 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 -> + withTString valueValue $ \p_valueValue -> do + type_ <- getType key subKeyPath valueName + regSetValueEx subKey valueName (fromMaybe rEG_SZ type_) p_valueValue $ (length valueValue + 1) * sizeOf (undefined :: TCHAR) + notifyEnvironmentUpdate + +notifyEnvironmentUpdate :: IO () +notifyEnvironmentUpdate = + withTString "Environment" $ \p_lparam -> do + let wparam = 0 + let lparam = fromIntegral $ castPtrToUINTPtr p_lparam + let hwnd = castUINTPtrToPtr 0xffff + sendMessage hwnd wM_SETTINGCHANGE wparam lparam + return () + where + wM_SETTINGCHANGE = 0x1A + +delValue :: HKEY -> String -> String -> IO () +delValue key subKeyPath valueName = + bracket (regOpenKey key subKeyPath) regCloseKey $ \subKey -> + withForeignPtr subKey $ \subKeyPtr -> + withTString valueName $ \p_valueName -> do + ret <- c_RegDeleteValue subKeyPtr p_valueName + notifyEnvironmentUpdate + 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/src/Utils.hs b/src/Utils.hs new file mode 100644 index 0000000..21ee67b --- /dev/null +++ b/src/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) " |