41 lines
1.6 KiB
Haskell
41 lines
1.6 KiB
Haskell
{-# OPTIONS_GHC -W #-}
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module Build.Interface (load,isValid) where
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Binary as Binary
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import qualified Build.Print as Print
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import qualified Elm.Internal.Version as Version
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import System.Directory (doesFileExist)
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import SourceSyntax.Module
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load :: Binary.Binary a => FilePath -> IO a
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load filePath =
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do exists <- doesFileExist filePath
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case exists of
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False -> Print.failure $ "Unable to find file " ++ filePath ++ " for deserialization!"
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True -> do
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bytes <- L.readFile filePath
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case Binary.decodeOrFail bytes of
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Right (_, _, binaryInfo) -> return binaryInfo
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Left (_, offset, err) -> Print.failure $ msg offset err
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where
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msg offset err = concat
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[ "Error reading build artifact: ", filePath, "\n"
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, " '", err, "' at offset ", show offset, "\n"
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, " The file was generated by a previous build and may be outdated or corrupt.\n"
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, " Please remove the file and try again."
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]
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isValid :: FilePath -> (String, ModuleInterface) -> Either String (String, ModuleInterface)
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isValid filePath (name, interface) =
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let version = iVersion interface in
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if version == Version.elmVersion
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then Right (name, interface)
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else Left $ concat
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[ "Error reading build artifact: ", filePath, "\n"
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, " It was generated by version ", show version, " of the compiler,\n"
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, " but you are using version ", show Version.elmVersion, "\n"
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, " Please remove the file and try again.\n"
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]
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