module CDecl ( goldenCDecl
             ) where

import qualified Data.ByteString.Lazy      as BSL
import           Data.Text.Lazy.Encoding   (encodeUtf8)
import           Kempe.File
import           Language.C.AST
import           Prettyprinter             (Doc, layoutSmart)
import           Prettyprinter.Render.Text (renderLazy)
import           Test.Tasty                (TestTree)
import           Test.Tasty.Golden         (goldenVsString)

renderBSL :: Doc ann -> BSL.ByteString
renderBSL = encodeUtf8 . renderLazy . layoutSmart cSettings where

compileOutput :: FilePath
              -> IO BSL.ByteString
compileOutput = fmap (renderBSL . prettyHeaders) . cDeclFile

goldenCDecl :: FilePath -- ^ Kempe file
            -> FilePath -- ^ Golden header file
            -> TestTree
goldenCDecl kFp golden =
    goldenVsString kFp golden (compileOutput kFp)