module Language.Haskell.GhcMod.Check (checkSyntax, check) where

import Control.Applicative
import Control.Monad
import CoreMonad
import Exception
import GHC
import Language.Haskell.GhcMod.ErrMsg
import Language.Haskell.GhcMod.GHCApi
import Language.Haskell.GhcMod.Types
import Prelude

----------------------------------------------------------------

-- | Checking syntax of a target file using GHC.
--   Warnings and errors are returned.
checkSyntax :: Options
            -> Cradle
            -> FilePath  -- ^ A target file
            -> IO String
checkSyntax opt cradle file = unlines <$> withGHC file (check opt cradle file)

----------------------------------------------------------------

-- | Checking syntax of a target file using GHC.
--   Warnings and errors are returned.
check :: Options
      -> Cradle
      -> FilePath  -- ^ A target file
      -> Ghc [String]
check opt cradle fileName = checkIt `gcatch` handleErrMsg
  where
    checkIt = do
        readLog <- initializeFlagsWithCradle opt cradle options True
        setTargetFile fileName
        checkSlowAndSet
        void $ load LoadAllTargets
        liftIO readLog
    options
      | expandSplice opt = "-w:"   : ghcOpts opt
      | otherwise        = "-Wall" : ghcOpts opt