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-rw-r--r--src/Environment.hs81
-rw-r--r--src/Registry.hs218
2 files changed, 189 insertions, 110 deletions
diff --git a/src/Environment.hs b/src/Environment.hs
index 2b53258..5a3978e 100644
--- a/src/Environment.hs
+++ b/src/Environment.hs
@@ -5,9 +5,9 @@
-}
module Environment
- ( saveToRegistry
+ ( queryFromRegistry
+ , saveToRegistry
, saveToRegistryWithPrompt
- , queryFromRegistry
, wipeFromRegistry
, wipeFromRegistryWithPrompt
, getEnv
@@ -16,12 +16,15 @@ module Environment
, RegistryBasedEnvironment(..)
) where
-import Control.Monad (liftM, when)
-import Data.List (intercalate)
-import Data.List.Split (splitOn)
-import Data.Maybe (fromMaybe)
+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 System.IO.Error (catchIOError, isDoesNotExistError)
+
+import qualified Graphics.Win32.Window as WinAPI
+import qualified System.Win32.Types as WinAPI
import qualified Registry
import qualified Utils (promptToContinue)
@@ -31,22 +34,45 @@ data RegistryBasedEnvironment
| AllUsersEnvironment
deriving (Eq, Show)
-registrySubKeyPath :: RegistryBasedEnvironment -> String
-registrySubKeyPath CurrentUserEnvironment = "Environment"
-registrySubKeyPath AllUsersEnvironment = "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"
+subKeyPath :: RegistryBasedEnvironment -> Registry.KeyPath
+subKeyPath CurrentUserEnvironment =
+ Registry.keyPathFromString "Environment"
+subKeyPath AllUsersEnvironment =
+ Registry.keyPathFromString "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"
+
+rootKey :: RegistryBasedEnvironment -> Registry.RootKey
+rootKey CurrentUserEnvironment = Registry.CurrentUser
+rootKey AllUsersEnvironment = Registry.LocalMachine
+
+openRootKey :: RegistryBasedEnvironment -> Registry.KeyHandle
+openRootKey = Registry.openRootKey . rootKey
-registryKey :: RegistryBasedEnvironment -> Registry.KeyHandle
-registryKey CurrentUserEnvironment = Registry.hkcu
-registryKey AllUsersEnvironment = Registry.hklm
+openRegistryKey :: RegistryBasedEnvironment -> IO Registry.KeyHandle
+openRegistryKey env = Registry.openSubKey (openRootKey env) (subKeyPath env)
+
+registryKeyPath :: RegistryBasedEnvironment -> Registry.KeyPath
+registryKeyPath env = Registry.keyPathJoin [Registry.rootKeyPath $ rootKey env, subKeyPath env]
+
+notifyEnvUpdate :: IO ()
+notifyEnvUpdate =
+ WinAPI.withTString "Environment" $ \lparamPtr -> do
+ let wparam = 0
+ let lparam = fromIntegral $ WinAPI.castPtrToUINTPtr lparamPtr
+ _ <- WinAPI.sendMessage allWindows messageCode wparam lparam
+ return ()
+ where
+ wM_SETTINGCHANGE = 0x1A
+ messageCode = wM_SETTINGCHANGE
-registryKeyPath :: RegistryBasedEnvironment -> String
-registryKeyPath CurrentUserEnvironment = "HKCU\\" ++ registrySubKeyPath CurrentUserEnvironment
-registryKeyPath AllUsersEnvironment = "HKLM\\" ++ registrySubKeyPath AllUsersEnvironment
+ allWindows = WinAPI.castUINTPtrToPtr 0xffff
-saveToRegistry :: RegistryBasedEnvironment -> String -> String -> IO ()
-saveToRegistry env = Registry.setString (registryKey env) (registrySubKeyPath env)
+saveToRegistry :: RegistryBasedEnvironment -> Registry.ValueName -> Registry.ValueData -> IO ()
+saveToRegistry env name value = do
+ keyHandle <- openRegistryKey env
+ Registry.setString keyHandle name value
+ notifyEnvUpdate
-saveToRegistryWithPrompt :: RegistryBasedEnvironment -> String -> String -> IO ()
+saveToRegistryWithPrompt :: RegistryBasedEnvironment -> Registry.ValueName -> Registry.ValueData -> IO ()
saveToRegistryWithPrompt env name value = do
putStrLn $ "Saving variable '" ++ name ++ "' to '" ++ registryKeyPath env ++ "'..."
oldValue <- queryFromRegistry env name
@@ -55,19 +81,22 @@ saveToRegistryWithPrompt env name value = do
agreed <- Utils.promptToContinue
when agreed $ saveToRegistry env name value
-queryFromRegistry :: RegistryBasedEnvironment -> String -> IO String
-queryFromRegistry env name = catchIOError (Registry.getString (registryKey env) (registrySubKeyPath env) name) emptyIfDoesNotExist
+queryFromRegistry :: RegistryBasedEnvironment -> Registry.ValueName -> IO Registry.ValueData
+queryFromRegistry env name = do
+ keyHandle <- openRegistryKey env
+ catchIOError (Registry.getString keyHandle 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 (Registry.delValue (registryKey env) (registrySubKeyPath env) name) ignoreIfDoesNotExist
+wipeFromRegistry :: RegistryBasedEnvironment -> Registry.ValueName -> IO ()
+wipeFromRegistry env name = do
+ keyHandle <- openRegistryKey env
+ catchIOError (Registry.delValue keyHandle name) ignoreIfDoesNotExist
+ notifyEnvUpdate
where
- ignoreIfDoesNotExist :: IOError -> IO ()
ignoreIfDoesNotExist e = if isDoesNotExistError e then return () else ioError e
-wipeFromRegistryWithPrompt :: RegistryBasedEnvironment -> String -> IO ()
+wipeFromRegistryWithPrompt :: RegistryBasedEnvironment -> Registry.ValueName -> IO ()
wipeFromRegistryWithPrompt env name = do
putStrLn $ "Deleting variable '" ++ name ++ "' from '" ++ registryKeyPath env ++ "'..."
agreed <- Utils.promptToContinue
diff --git a/src/Registry.hs b/src/Registry.hs
index a38ef00..6ca9591 100644
--- a/src/Registry.hs
+++ b/src/Registry.hs
@@ -5,96 +5,146 @@
-}
module Registry
- ( KeyHandle
+ ( KeyPath
+ , keyPathFromString
+ , keyPathJoin
+ , keyPathSplit
+
+ , KeyHandle
+ , openSubKey
+
+ , RootKey(..)
+ , openRootKey
+ , rootKeyPath
+
+ , ValueName
, delValue
+
+ , ValueData
, getString
, setString
- , hkcu
- , hklm
) where
-import Control.Exception (bracket)
-import Data.Maybe (fromMaybe)
-import Foreign.ForeignPtr (withForeignPtr)
+import Data.List (intercalate)
+import Data.List.Split (splitOn)
+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
-
-newtype KeyHandle = KeyHandle HKEY
-
-getType :: HKEY -> String -> String -> IO (Maybe RegValueType)
-getType key subKeyPath valueName =
- bracket (regOpenKey key subKeyPath) regCloseKey $ \hKey ->
- withForeignPtr hKey $ \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 :: KeyHandle -> String -> String -> IO String
-getString (KeyHandle hKey) subKeyPath valueName =
- bracket (regOpenKey hKey subKeyPath) regCloseKey $ \hSubKey ->
- withForeignPtr hSubKey $ \p_key ->
- withTString valueName $ \p_valueName ->
+import Foreign.Ptr (castPtr, plusPtr)
+import Foreign.Storable (peek, poke, sizeOf)
+import System.IO.Error (catchIOError, doesNotExistErrorType, mkIOError, isDoesNotExistError)
+
+import qualified System.Win32.Types as WinAPI
+import qualified System.Win32.Registry as WinAPI
+
+type KeyName = String
+type KeyPath = KeyName
+
+keyPathSep :: KeyPath
+keyPathSep = "\\"
+
+keyPathFromString :: String -> KeyPath
+keyPathFromString = keyPathJoin . keyPathSplit
+
+keyPathSplit :: KeyPath -> [KeyName]
+keyPathSplit = filter (not . null) . splitOn keyPathSep
+
+keyPathJoin :: [KeyName] -> KeyPath
+keyPathJoin = intercalate keyPathSep . filter (not . null)
+
+type KeyHandle = WinAPI.HKEY
+
+openSubKey :: KeyHandle -> KeyPath -> IO KeyHandle
+openSubKey = WinAPI.regOpenKey
+
+data RootKey = CurrentUser
+ | LocalMachine
+ deriving (Eq, Show)
+
+rootKeyPath :: RootKey -> KeyName
+rootKeyPath CurrentUser = "HKCU"
+rootKeyPath LocalMachine = "HKLM"
+
+openRootKey :: RootKey -> KeyHandle
+openRootKey CurrentUser = WinAPI.hKEY_CURRENT_USER
+openRootKey LocalMachine = WinAPI.hKEY_LOCAL_MACHINE
+
+type ValueName = String
+
+raiseDoesNotExistError :: String -> IO a
+raiseDoesNotExistError functionName =
+ ioError $ mkIOError doesNotExistErrorType functionName Nothing Nothing
+
+raiseUnknownError :: String -> WinAPI.ErrCode -> IO a
+raiseUnknownError functionName exitCode = WinAPI.failWith functionName exitCode
+
+exitCodeSuccess :: WinAPI.ErrCode
+exitCodeSuccess = 0
+
+exitCodeFileNotFound :: WinAPI.ErrCode
+exitCodeFileNotFound = 0x2
+
+exitCodeMoreData :: WinAPI.ErrCode
+exitCodeMoreData = 0xea
+
+raiseError :: String -> WinAPI.ErrCode -> IO a
+raiseError functionName ret
+ | ret == exitCodeFileNotFound = raiseDoesNotExistError functionName
+ | otherwise = raiseUnknownError functionName ret
+
+delValue :: KeyHandle -> ValueName -> IO ()
+delValue keyHandle valueName =
+ withForeignPtr keyHandle $ \keyPtr ->
+ WinAPI.withTString valueName $ \valueNamePtr -> do
+ ret <- WinAPI.c_RegDeleteValue keyPtr valueNamePtr
+ if ret == exitCodeSuccess
+ then return ()
+ else raiseError "RegDeleteValue" ret
+
+type ValueType = WinAPI.RegValueType
+
+getType :: KeyHandle -> ValueName -> IO ValueType
+getType keyHandle valueName =
+ withForeignPtr keyHandle $ \keyPtr ->
+ WinAPI.withTString valueName $ \valueNamePtr ->
+ alloca $ \typePtr -> do
+ ret <- WinAPI.c_RegQueryValueEx keyPtr valueNamePtr WinAPI.nullPtr typePtr WinAPI.nullPtr WinAPI.nullPtr
+ if ret == exitCodeSuccess
+ then peek typePtr
+ else raiseError "RegQueryValueEx" ret
+
+type ValueData = String
+
+getString :: KeyHandle -> ValueName -> IO ValueData
+getString keyHandle valueName =
+ withForeignPtr keyHandle $ \keyPtr ->
+ WinAPI.withTString valueName $ \valueNamePtr ->
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 :: KeyHandle -> String -> String -> String -> IO ()
-setString (KeyHandle hKey) subKeyPath valueName valueValue =
- bracket (regOpenKey hKey subKeyPath) regCloseKey $ \subKey ->
- withTString valueValue $ \p_valueValue -> do
- type_ <- getType hKey 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 ()
+ ret <- WinAPI.c_RegQueryValueEx keyPtr valueNamePtr WinAPI.nullPtr WinAPI.nullPtr WinAPI.nullPtr dataSizePtr
+ if ret == exitCodeSuccess
+ then return ""
+ else if ret /= exitCodeMoreData
+ then raiseError "RegQueryValueEx" ret
+ else getStringTerminated keyPtr valueNamePtr dataSizePtr
+ where
+ getStringTerminated keyPtr valueNamePtr dataSizePtr = do
+ dataSize <- peek dataSizePtr
+ let newDataSize = dataSize + fromIntegral (sizeOf (undefined :: WinAPI.TCHAR))
+ poke dataSizePtr newDataSize
+ allocaBytes (fromIntegral newDataSize) $ \dataPtr -> do
+ poke (castPtr $ plusPtr dataPtr $ fromIntegral dataSize) '\0'
+ ret <- WinAPI.c_RegQueryValueEx keyPtr valueNamePtr WinAPI.nullPtr WinAPI.nullPtr dataPtr dataSizePtr
+ if ret == exitCodeSuccess
+ then WinAPI.peekTString $ castPtr dataPtr
+ else raiseError "RegQueryValueEx" ret
+
+setString :: KeyHandle -> ValueName -> ValueData -> IO ()
+setString key name value =
+ WinAPI.withTString value $ \valuePtr -> do
+ type_ <- catchIOError (getType key name) stringTypeByDefault
+ WinAPI.regSetValueEx key name type_ valuePtr valueSize
where
- wM_SETTINGCHANGE = 0x1A
-
-delValue :: KeyHandle -> String -> String -> IO ()
-delValue (KeyHandle hKey) subKeyPath valueName =
- bracket (regOpenKey hKey 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 :: KeyHandle
-hkcu = KeyHandle hKEY_CURRENT_USER
-
-hklm :: KeyHandle
-hklm = KeyHandle hKEY_LOCAL_MACHINE
+ stringTypeByDefault e = if isDoesNotExistError e
+ then return WinAPI.rEG_SZ
+ else ioError e
+ valueSize = (length value + 1) * sizeOf (undefined :: WinAPI.TCHAR)