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{- portable environment variables
-
- Copyright 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Utility.Env where
#ifdef __WINDOWS__
import qualified System.Environment as E
import Utility.Exception
#else
import qualified System.Posix.Env as E
#endif
{- Posix getEnv is faster than the one in System.Environment,
- so use when available. -}
getEnv :: String -> IO (Maybe String)
#ifndef __WINDOWS__
getEnv = E.getEnv
#else
getEnv = catchMaybeIO . E.getEnv
#endif
getEnvDefault :: String -> String -> IO String
#ifndef __WINDOWS__
getEnvDefault = E.getEnvDefault
#else
getEnvDefault var fallback = fromMaybe fallback <$> getEnv var
#endif
{- Returns True if it could successfully set the environment variable.
-
- There is, apparently, no way to do this in Windows. Instead,
- environment varuables must be provided when running a new process. -}
setEnv :: String -> String -> Bool -> IO Bool
#ifndef __WINDOWS__
setEnv var val overwrite = do
E.setEnv var val overwrite
return True
#else
setEnv _ _ _ = return False
#endif
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