51 lines
1.8 KiB
Haskell
51 lines
1.8 KiB
Haskell
module Metadata.Prelude (interfaces, add) where
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import qualified Data.Map as Map
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import qualified Control.Exception as E
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import qualified Paths_Elm as Path
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import System.Directory
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import System.Exit
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import System.FilePath
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import System.IO.Unsafe (unsafePerformIO)
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import SourceSyntax.Module
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import qualified Data.Binary as Binary
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add :: Module t v -> Module t v
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add (Module name exs ims stmts) = Module name exs (customIms ++ ims) stmts
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where
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customIms = concatMap addModule prelude
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addModule (n, method) = case lookup n ims of
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Nothing -> [(n, method)]
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Just (As m) -> [(n, method)]
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Just _ -> []
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prelude :: [(String, ImportMethod)]
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prelude = text ++ map (\n -> (n, Hiding [])) modules
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where
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text = map ((,) "Text") [ As "Text", Hiding ["link", "color", "height"] ]
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modules = [ "Basics", "Signal", "List", "Maybe", "Time"
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, "Graphics.Element", "Color", "Graphics.Collage" ]
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{-# NOINLINE interfaces #-}
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interfaces :: Interfaces
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interfaces =
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unsafePerformIO (safeReadDocs =<< Path.getDataFileName "interfaces.data")
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safeReadDocs :: FilePath -> IO Interfaces
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safeReadDocs name =
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E.catch (readDocs name) $ \err -> do
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let _ = err :: IOError
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putStrLn $ unlines [ "Error reading types for standard library!"
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, " The file should be at " ++ name
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, " If you are using a stable version of Elm,"
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, " please report an issue at github.com/evancz/Elm"
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, " and specify your versions of Elm and your OS" ]
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exitFailure
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readDocs :: FilePath -> IO Interfaces
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readDocs name = do
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exists <- doesFileExist name
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if exists then Map.fromList `fmap` Binary.decodeFile name
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else ioError . userError $ "File Not Found"
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