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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 ( saveToRegistry
, saveToRegistryWithPrompt
, queryFromRegistry
, wipeFromRegistry
, wipeFromRegistryWithPrompt
, getEnv
, splitPaths
, joinPaths
, RegistryBasedEnvironment(..) ) 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 Registry
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 :: RegistryBasedEnvironment -> Registry.KeyHandle
registryKey CurrentUserEnvironment = Registry.hkcu
registryKey AllUsersEnvironment = Registry.hklm
registryKeyPath :: RegistryBasedEnvironment -> String
registryKeyPath CurrentUserEnvironment = "HKCU\\" ++ registrySubKeyPath CurrentUserEnvironment
registryKeyPath AllUsersEnvironment = "HKLM\\" ++ registrySubKeyPath AllUsersEnvironment
saveToRegistry :: RegistryBasedEnvironment -> String -> String -> IO ()
saveToRegistry env = Registry.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 (Registry.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 (Registry.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 :: String
pathSep = ";"
splitPaths :: String -> [String]
splitPaths = filter (not . null) . splitOn pathSep
joinPaths :: [String] -> String
joinPaths = intercalate pathSep . filter (not . null)
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