{-# LANGUAGE CPP #-}
module GhcUtil (withGhc) where

import           Imports

import           GHC.Paths (libdir)
import           GHC
#if __GLASGOW_HASKELL__ < 900
import           DynFlags (gopt_set)
#else
import           GHC.Driver.Session (gopt_set)
#endif

#if __GLASGOW_HASKELL__ < 900
import           Panic (throwGhcException)
#else
import           GHC.Utils.Panic (throwGhcException)
#endif

#if __GLASGOW_HASKELL__ < 900
import           MonadUtils (liftIO)
#else
import           GHC.Utils.Monad (liftIO)
#endif

import           System.Exit (exitFailure)

-- Catch GHC source errors, print them and exit.
handleSrcErrors :: Ghc a -> Ghc a
handleSrcErrors :: forall a. Ghc a -> Ghc a
handleSrcErrors Ghc a
action' = ((SourceError -> Ghc a) -> Ghc a -> Ghc a)
-> Ghc a -> (SourceError -> Ghc a) -> Ghc a
forall a b c. (a -> b -> c) -> b -> a -> c
flip (SourceError -> Ghc a) -> Ghc a -> Ghc a
forall (m :: * -> *) a.
MonadCatch m =>
(SourceError -> m a) -> m a -> m a
handleSourceError Ghc a
action' ((SourceError -> Ghc a) -> Ghc a)
-> (SourceError -> Ghc a) -> Ghc a
forall a b. (a -> b) -> a -> b
$ \SourceError
err -> do
  SourceError -> Ghc ()
forall (m :: * -> *).
(HasLogger m, MonadIO m, HasDynFlags m) =>
SourceError -> m ()
printException SourceError
err
  IO a -> Ghc a
forall a. IO a -> Ghc a
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO IO a
forall a. IO a
exitFailure

-- | Run a GHC action in Haddock mode
withGhc :: [String] -> ([String] -> Ghc a) -> IO a
withGhc :: forall a. [String] -> ([String] -> Ghc a) -> IO a
withGhc [String]
flags [String] -> Ghc a
action = do
  flags_ <- [String] -> IO [Located String]
handleStaticFlags [String]
flags

  runGhc (Just libdir) $ do
    handleDynamicFlags flags_ >>= handleSrcErrors . action

handleStaticFlags :: [String] -> IO [Located String]
handleStaticFlags :: [String] -> IO [Located String]
handleStaticFlags [String]
flags = [Located String] -> IO [Located String]
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return ([Located String] -> IO [Located String])
-> [Located String] -> IO [Located String]
forall a b. (a -> b) -> a -> b
$ (String -> Located String) -> [String] -> [Located String]
forall a b. (a -> b) -> [a] -> [b]
map String -> Located String
forall e. e -> Located e
noLoc ([String] -> [Located String]) -> [String] -> [Located String]
forall a b. (a -> b) -> a -> b
$ [String]
flags

handleDynamicFlags :: GhcMonad m => [Located String] -> m [String]
handleDynamicFlags :: forall (m :: * -> *). GhcMonad m => [Located String] -> m [String]
handleDynamicFlags [Located String]
flags = do
#if __GLASGOW_HASKELL__ >= 901
  logger <- m Logger
forall (m :: * -> *). HasLogger m => m Logger
getLogger
  let parseDynamicFlags' = Logger
-> DynFlags
-> [Located String]
-> m (DynFlags, [Located String], Messages DriverMessage)
forall (m :: * -> *).
MonadIO m =>
Logger
-> DynFlags
-> [Located String]
-> m (DynFlags, [Located String], Messages DriverMessage)
parseDynamicFlags Logger
logger
#else
  let parseDynamicFlags' = parseDynamicFlags
#endif
  (dynflags, locSrcs, _) <- (setHaddockMode `fmap` getSessionDynFlags) >>= (`parseDynamicFlags'` flags)
  _ <- setSessionDynFlags dynflags

  -- We basically do the same thing as `ghc/Main.hs` to distinguish
  -- "unrecognised flags" from source files.
  let srcs = (Located String -> String) -> [Located String] -> [String]
forall a b. (a -> b) -> [a] -> [b]
map Located String -> String
forall l e. GenLocated l e -> e
unLoc [Located String]
locSrcs
      unknown_opts = [ String
f | f :: String
f@(Char
'-':String
_) <- [String]
srcs ]
  case unknown_opts of
    String
opt : [String]
_ -> GhcException -> m [String]
forall a. GhcException -> a
throwGhcException (String -> GhcException
UsageError (String
"unrecognized option `"String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
opt String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
"'"))
    [String]
_       -> [String] -> m [String]
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return [String]
srcs

setHaddockMode :: DynFlags -> DynFlags
setHaddockMode :: DynFlags -> DynFlags
setHaddockMode DynFlags
dynflags = (DynFlags -> GeneralFlag -> DynFlags
gopt_set DynFlags
dynflags GeneralFlag
Opt_Haddock) {
#if __GLASGOW_HASKELL__ >= 906
      backend   = noBackend
#elif __GLASGOW_HASKELL__ >= 901
      backend   = NoBackend
#else
      hscTarget = HscNothing
#endif
    , ghcMode   = CompManager
    , ghcLink   = NoLink
    }