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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 Control.Exception (finally)
import Data.List (intercalate)
import Data.List.Split (splitOn)
import qualified Windows.Registry as Registry
import Windows.Utils (notifyEnvironmentUpdate)
data Profile = CurrentUser
| AllUsers
deriving (Eq, Show)
profileKeyPath :: Profile -> Registry.KeyPath
profileKeyPath CurrentUser = Registry.KeyPath Registry.CurrentUser ["Environment"]
profileKeyPath AllUsers = Registry.KeyPath Registry.LocalMachine
[ "SYSTEM"
, "CurrentControlSet"
, "Control"
, "Session Manager"
, "Environment"
]
type VarName = String
type VarValue = String
query :: Profile -> VarName -> IO (Either IOError VarValue)
query profile name = Registry.getExpandedString (profileKeyPath profile) name
engrave :: Profile -> VarName -> VarValue -> IO (Either IOError ())
engrave profile name value = finally doEngrave notifyEnvironmentUpdate
where
doEngrave = Registry.setStringPreserveType (profileKeyPath profile) name value
wipe :: Profile -> VarName -> IO (Either IOError ())
wipe profile name = finally doWipe notifyEnvironmentUpdate
where
doWipe = Registry.deleteValue (profileKeyPath profile) name
pathSep :: VarValue
pathSep = ";"
pathSplit :: VarValue -> [VarValue]
pathSplit = filter (not . null) . splitOn pathSep
pathJoin :: [VarValue] -> VarValue
pathJoin = intercalate pathSep . filter (not . null)
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