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|
-- |
-- Copyright : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
-- License : MIT
-- Maintainer : Egor.Tensin@gmail.com
-- Stability : experimental
--
-- High-level functions for reading and writing Windows environment variables.
module Windows.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 Windows.Registry as Registry
import Windows.Utils (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 rootKey subKeyPath
where
rootKey = openRootProfileKey profile
subKeyPath = profileSubKeyPath profile
type VarName = Registry.ValueName
type VarValue = Registry.ValueData
query :: Profile -> VarName -> IO (Maybe VarValue)
query profile name = do
keyHandle <- openProfileKey profile
catchIOError (tryQuery keyHandle) ignoreMissing
where
tryQuery keyHandle = do
value <- Registry.getString keyHandle name
return $ Just value
ignoreMissing e
| isDoesNotExistError e = return Nothing
| otherwise = 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) ignoreMissing
notifyEnvironmentUpdate
where
ignoreMissing e
| isDoesNotExistError e = return ()
| otherwise = ioError e
pathSep :: VarValue
pathSep = ";"
pathSplit :: VarValue -> [VarValue]
pathSplit = filter (not . null) . splitOn pathSep
pathJoin :: [VarValue] -> VarValue
pathJoin = intercalate pathSep . filter (not . null)
|
