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36 lines
877 B
Haskell
36 lines
877 B
Haskell
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{-# LANGUAGE DeriveGeneric #-}
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module Data.Environment
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( Environment()
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, getEnvironment
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, mkEnvironment
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, emptyEnvironment
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, maybeEnvironment
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, lookupEnv)
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where
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import Hasura.Prelude
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import Data.Aeson
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import qualified System.Environment
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import qualified Data.Map as M
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newtype Environment = Environment (M.Map String String) deriving (Eq, Show, Generic)
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instance FromJSON Environment
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getEnvironment :: IO Environment
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getEnvironment = mkEnvironment <$> System.Environment.getEnvironment
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maybeEnvironment :: Maybe Environment -> Environment
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maybeEnvironment = fromMaybe emptyEnvironment
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mkEnvironment :: [(String, String)] -> Environment
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mkEnvironment = Environment . M.fromList
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emptyEnvironment :: Environment
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emptyEnvironment = Environment M.empty
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lookupEnv :: Environment -> String -> Maybe String
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lookupEnv (Environment es) k = M.lookup k es
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