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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 Environment
( Profile(..)
, profileKeyPath
, VarName
, VarValue
, query
, engrave
, wipe
, pathJoin
, pathSplit
) where
import Data.List (intercalate)
import Data.List.Split (splitOn)
import System.IO.Error (catchIOError, isDoesNotExistError)
import qualified Registry
import WindowsUtils (notifyEnvironmentUpdate)
data Profile = CurrentUser
| AllUsers
deriving (Eq, Show)
profileRootKey :: Profile -> Registry.RootKey
profileRootKey CurrentUser = Registry.CurrentUser
profileRootKey AllUsers = Registry.LocalMachine
profileRootKeyPath :: Profile -> Registry.KeyPath
profileRootKeyPath = Registry.rootKeyPath . profileRootKey
profileSubKeyPath :: Profile -> Registry.KeyPath
profileSubKeyPath CurrentUser =
Registry.keyPathFromString "Environment"
profileSubKeyPath AllUsers =
Registry.keyPathFromString "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"
profileKeyPath :: Profile -> Registry.KeyPath
profileKeyPath profile = Registry.keyPathJoin
[ profileRootKeyPath profile
, profileSubKeyPath profile
]
openRootProfileKey :: Profile -> Registry.KeyHandle
openRootProfileKey = Registry.openRootKey . profileRootKey
openProfileKey :: Profile -> IO Registry.KeyHandle
openProfileKey profile = Registry.openSubKey (openRootProfileKey profile) (profileSubKeyPath profile)
type VarName = Registry.ValueName
type VarValue = Registry.ValueData
query :: Profile -> VarName -> IO (Maybe VarValue)
query profile name = do
keyHandle <- openProfileKey profile
catchIOError (Registry.getString keyHandle name >>= return . Just) emptyIfDoesNotExist
where
emptyIfDoesNotExist e = if isDoesNotExistError e then return Nothing else ioError e
engrave :: Profile -> VarName -> VarValue -> IO ()
engrave profile name value = do
keyHandle <- openProfileKey profile
Registry.setString keyHandle name value
notifyEnvironmentUpdate
wipe :: Profile -> VarName -> IO ()
wipe profile name = do
keyHandle <- openProfileKey profile
catchIOError (Registry.delValue keyHandle name) ignoreIfDoesNotExist
notifyEnvironmentUpdate
where
ignoreIfDoesNotExist e = if isDoesNotExistError e then return () else ioError e
pathSep :: VarValue
pathSep = ";"
pathSplit :: VarValue -> [VarValue]
pathSplit = filter (not . null) . splitOn pathSep
pathJoin :: [VarValue] -> VarValue
pathJoin = intercalate pathSep . filter (not . null)
|
