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51 lines
1.1 KiB
Haskell
51 lines
1.1 KiB
Haskell
module Noun
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( module Noun.Atom
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, module Data.Word
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, module Noun.Conversions
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, module Noun.Convert
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, module Noun.Core
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, module Noun.Cue
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, module Noun.Jam
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, module Noun.Tank
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, module Noun.TH
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, _Cue
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, LoadErr(..)
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, loadFile
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) where
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import ClassyPrelude
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import Control.Lens
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import Data.Word
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import Noun.Atom
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import Noun.Conversions
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import Noun.Convert
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import Noun.Core
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import Noun.Cue
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import Noun.Jam
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import Noun.Tank
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import Noun.TH
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--------------------------------------------------------------------------------
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_Cue :: Prism' ByteString Noun
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_Cue = prism' jamBS (eitherToMaybe . cueBS)
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where
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eitherToMaybe (Left _) = Nothing
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eitherToMaybe (Right x) = Just x
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data LoadErr
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= FileErr IOException
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| CueErr DecodeErr
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| ParseErr [Text] Text
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deriving (Show)
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instance Exception LoadErr
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loadFile :: ∀a. FromNoun a => FilePath -> IO (Either LoadErr a)
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loadFile pax = try $ do
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byt <- try (readFile pax) >>= either (throwIO . FileErr) pure
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non <- cueBS byt & either (throwIO . CueErr) pure
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res <- fromNounErr non & either (throwIO . uncurry ParseErr) pure
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pure res
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