diff options
Diffstat (limited to 'Utility/Env.hs')
| -rw-r--r-- | Utility/Env.hs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Utility/Env.hs b/Utility/Env.hs index dfebd9868..c56f4ec23 100644 --- a/Utility/Env.hs +++ b/Utility/Env.hs @@ -16,6 +16,7 @@ import Control.Applicative import Data.Maybe import Prelude import qualified System.Environment as E +import qualified System.SetEnv #else import qualified System.Posix.Env as PE #endif @@ -41,6 +42,29 @@ getEnvironment = PE.getEnvironment getEnvironment = E.getEnvironment #endif +{- Sets an environment variable. To overwrite an existing variable, + - overwrite must be True. + - + - On Windows, setting a variable to "" unsets it. -} +setEnv :: String -> String -> Bool -> IO () +#ifndef mingw32_HOST_OS +setEnv var val overwrite = PE.setEnv var val overwrite +#else +setEnv var val True = System.SetEnv.setEnv var val +setEnv var val False = do + r <- getEnv var + case r of + Nothing -> setEnv var val True + Just _ -> return () +#endif + +unsetEnv :: String -> IO () +#ifndef mingw32_HOST_OS +unsetEnv = PE.unsetEnv +#else +unsetEnv = System.SetEnv.unsetEnv +#endif + {- Adds the environment variable to the input environment. If already - present in the list, removes the old value. - |