ghc-mod/Language/Haskell/GhcMod/DynFlags.hs

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module Language.Haskell.GhcMod.DynFlags where
import Control.Applicative ((<$>))
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import Control.Monad (void)
import GHC (DynFlags(..), GhcMode(..), GhcLink(..), HscTarget(..))
import qualified GHC as G
import GHC.Paths (libdir)
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import GhcMonad
import qualified Language.Haskell.GhcMod.Gap as Gap
import Language.Haskell.GhcMod.Types
import System.IO.Unsafe (unsafePerformIO)
data Build = CabalPkg | SingleFile deriving Eq
setEmptyLogger :: DynFlags -> DynFlags
setEmptyLogger df = Gap.setLogAction df $ \_ _ _ _ _ -> return ()
-- Fast
-- Friendly to foreign export
-- Not friendly to Template Haskell
-- Uses small memory
setModeSimple :: DynFlags -> DynFlags
setModeSimple df = df {
ghcMode = CompManager
, ghcLink = NoLink
, hscTarget = HscNothing
, optLevel = 0
}
-- Slow
-- Not friendly to foreign export
-- Friendly to Template Haskell
-- Uses large memory
setModeIntelligent :: DynFlags -> DynFlags
setModeIntelligent df = df {
ghcMode = CompManager
, ghcLink = LinkInMemory
, hscTarget = HscInterpreted
, optLevel = 0
}
setIncludeDirs :: [IncludeDir] -> DynFlags -> DynFlags
setIncludeDirs idirs df = df { importPaths = idirs }
setBuildEnv :: Build -> DynFlags -> DynFlags
setBuildEnv build = setHideAllPackages build . setCabalPackage build
-- At the moment with this option set ghc only prints different error messages,
-- suggesting the user to add a hidden package to the build-depends in his cabal
-- file for example
setCabalPackage :: Build -> DynFlags -> DynFlags
setCabalPackage CabalPkg df = Gap.setCabalPkg df
setCabalPackage _ df = df
-- | Enable hiding of all package not explicitly exposed (like Cabal does)
setHideAllPackages :: Build -> DynFlags -> DynFlags
setHideAllPackages CabalPkg df = Gap.setHideAllPackages df
setHideAllPackages _ df = df
-- | Parse command line ghc options and add them to the 'DynFlags' passed
addCmdOpts :: GhcMonad m => [GHCOption] -> DynFlags -> m DynFlags
addCmdOpts cmdOpts df =
tfst <$> G.parseDynamicFlags df (map G.noLoc cmdOpts)
where
tfst (a,_,_) = a
----------------------------------------------------------------
-- | Return the 'DynFlags' currently in use in the GHC session.
getDynamicFlags :: IO DynFlags
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getDynamicFlags = G.runGhc (Just libdir) G.getSessionDynFlags
withDynFlags :: GhcMonad m
=> (DynFlags -> DynFlags)
-> m a
-> m a
withDynFlags setFlags body = G.gbracket setup teardown (\_ -> body)
where
setup = do
dflags <- G.getSessionDynFlags
void $ G.setSessionDynFlags (setFlags dflags)
return dflags
teardown = void . G.setSessionDynFlags
withCmdFlags :: GhcMonad m => [GHCOption] -> m a -> m a
withCmdFlags flags body = G.gbracket setup teardown (\_ -> body)
where
setup = do
dflags <- G.getSessionDynFlags >>= addCmdOpts flags
void $ G.setSessionDynFlags dflags
return dflags
teardown = void . G.setSessionDynFlags
----------------------------------------------------------------
-- | Set 'DynFlags' equivalent to "-w:".
setNoWaringFlags :: DynFlags -> DynFlags
setNoWaringFlags df = df { warningFlags = Gap.emptyWarnFlags}
-- | Set 'DynFlags' equivalent to "-Wall".
setAllWaringFlags :: DynFlags -> DynFlags
setAllWaringFlags df = df { warningFlags = allWarningFlags }
allWarningFlags :: Gap.WarnFlags
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allWarningFlags = unsafePerformIO $
G.runGhc (Just libdir) $ do
df <- G.getSessionDynFlags
df' <- addCmdOpts ["-Wall"] df
return $ G.warningFlags df'
----------------------------------------------------------------