Environment.hs

-- cabal-helper: Simple interface to Cabal's configuration state
-- Copyright (C) 2017  Daniel Gröber <cabal-helper@dxld.at>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program.  If not, see <http://www.gnu.org/licenses/>.

{-# LANGUAGE CPP #-}
module CabalHelper.Compiletime.Compat.Environment where

import qualified System.Environment
#ifndef mingw32_HOST_OS
import qualified System.Posix.Env (setEnv)
#endif

lookupEnv :: String -> IO (Maybe String)
lookupEnv var =
  do env <- System.Environment.getEnvironment
     return (lookup var env)

setEnv :: String -> String -> IO ()
#ifdef mingw32_HOST_OS
setEnv = System.Environment.setEnv
#else
setEnv k v = System.Posix.Env.setEnv k v True
#endif