182 lines
6.3 KiB
Haskell
182 lines
6.3 KiB
Haskell
{-# LANGUAGE ScopedTypeVariables #-}
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module Language.Haskell.GhcMod.GHCApi (
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withGHC
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, withGHCDummyFile
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, initializeFlags
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, initializeFlagsWithCradle
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, setTargetFiles
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, addTargetFiles
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, getDynamicFlags
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, getSystemLibDir
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) where
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import Control.Applicative (Alternative, (<$>))
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import Control.Monad (void, forM)
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import CoreMonad (liftIO)
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import Data.Maybe (isJust, fromJust)
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import Distribution.PackageDescription (PackageDescription)
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import DynFlags (dopt_set)
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import Exception (ghandle, SomeException(..))
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import GHC (Ghc, GhcMonad, DynFlags(..), GhcLink(..), HscTarget(..))
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import qualified GHC as G
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import Language.Haskell.GhcMod.CabalApi
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import Language.Haskell.GhcMod.Cradle (userPackageDbOptsForGhc)
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import Language.Haskell.GhcMod.ErrMsg
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import Language.Haskell.GhcMod.GHCChoice
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import qualified Language.Haskell.GhcMod.Gap as Gap
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import Language.Haskell.GhcMod.Types
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import System.Exit (exitSuccess)
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import System.IO (hPutStr, hPrint, stderr)
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import System.Process (readProcess)
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----------------------------------------------------------------
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-- | Obtaining the directory for system libraries.
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getSystemLibDir :: IO (Maybe FilePath)
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getSystemLibDir = do
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res <- readProcess "ghc" ["--print-libdir"] []
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return $ case res of
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"" -> Nothing
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dirn -> Just (init dirn)
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----------------------------------------------------------------
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-- | Converting the 'Ghc' monad to the 'IO' monad.
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withGHCDummyFile :: Alternative m => Ghc (m a) -- ^ 'Ghc' actions created by the Ghc utilities.
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-> IO (m a)
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withGHCDummyFile = withGHC "Dummy"
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-- | Converting the 'Ghc' monad to the 'IO' monad.
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withGHC :: Alternative m => FilePath -- ^ A target file displayed in an error message.
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-> Ghc (m a) -- ^ 'Ghc' actions created by the Ghc utilities.
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-> IO (m a)
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withGHC file body = do
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mlibdir <- getSystemLibDir
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ghandle ignore $ G.runGhc mlibdir $ do
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dflags <- G.getSessionDynFlags
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G.defaultCleanupHandler dflags body
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where
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ignore :: Alternative m => SomeException -> IO (m a)
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ignore e = do
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hPutStr stderr $ file ++ ":0:0:Error:"
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hPrint stderr e
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exitSuccess
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----------------------------------------------------------------
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importDirs :: [IncludeDir]
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importDirs = [".","..","../..","../../..","../../../..","../../../../.."]
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data Build = CabalPkg | SingleFile deriving Eq
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-- | Initialize the 'DynFlags' relating to the compilation of a single
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-- file or GHC session according to the 'Cradle' and 'Options'
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-- provided.
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initializeFlagsWithCradle :: GhcMonad m => Options -> Cradle -> [GHCOption] -> Bool -> m (LogReader, Maybe PackageDescription)
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initializeFlagsWithCradle opt cradle ghcopts logging
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| cabal = withCabal |||> withSandbox
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| otherwise = withSandbox
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where
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mCradleFile = cradleCabalFile cradle
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cabal = isJust mCradleFile
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withCabal = do
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pkgDesc <- liftIO $ parseCabalFile $ fromJust mCradleFile
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compOpts <- liftIO $ getCompilerOptions ghcopts cradle pkgDesc
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logger <- initSession CabalPkg opt compOpts logging
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return (logger, Just pkgDesc)
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withSandbox = do
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logger <- initSession SingleFile opt compOpts logging
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return (logger, Nothing)
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where
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pkgDb = userPackageDbOptsForGhc $ cradlePackageDb cradle
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compOpts
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| pkgDb == [] = CompilerOptions ghcopts importDirs []
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| otherwise = CompilerOptions (ghcopts ++ pkgDb) [wdir,rdir] []
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wdir = cradleCurrentDir cradle
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rdir = cradleRootDir cradle
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----------------------------------------------------------------
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initSession :: GhcMonad m => Build
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-> Options
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-> CompilerOptions
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-> Bool
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-> m LogReader
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initSession build opt compOpts logging = do
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dflags0 <- G.getSessionDynFlags
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(dflags1,readLog) <- setupDynamicFlags dflags0
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_ <- G.setSessionDynFlags dflags1
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return readLog
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where
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cmdOpts = ghcOptions compOpts
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idirs = includeDirs compOpts
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depPkgs = depPackages compOpts
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ls = lineSeparator opt
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setupDynamicFlags df0 = do
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df1 <- modifyFlagsWithOpts df0 cmdOpts
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let df2 = modifyFlags df1 idirs depPkgs (expandSplice opt) build
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df3 <- modifyFlagsWithOpts df2 $ ghcOpts opt
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liftIO $ setLogger logging df3 ls
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----------------------------------------------------------------
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-- | Initialize the 'DynFlags' relating to the compilation of a single
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-- file or GHC session.
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initializeFlags :: GhcMonad m => Options -> m ()
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initializeFlags opt = do
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dflags0 <- G.getSessionDynFlags
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dflags1 <- modifyFlagsWithOpts dflags0 $ ghcOpts opt
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void $ G.setSessionDynFlags dflags1
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----------------------------------------------------------------
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modifyFlags :: DynFlags -> [IncludeDir] -> [Package] -> Bool -> Build -> DynFlags
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modifyFlags d0 idirs depPkgs splice build
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| splice = setSplice d4
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| otherwise = d4
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where
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d1 = d0 { importPaths = idirs }
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d2 = d1 {
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ghcLink = LinkInMemory
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, hscTarget = HscInterpreted
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}
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d3 = Gap.addDevPkgs d2 depPkgs
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d4 | build == CabalPkg = Gap.setCabalPkg d3
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| otherwise = d3
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setSplice :: DynFlags -> DynFlags
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setSplice dflag = dopt_set dflag Gap.dumpSplicesFlag
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----------------------------------------------------------------
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modifyFlagsWithOpts :: GhcMonad m => DynFlags -> [GHCOption] -> m DynFlags
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modifyFlagsWithOpts dflags cmdOpts =
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tfst <$> G.parseDynamicFlags dflags (map G.noLoc cmdOpts)
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where
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tfst (a,_,_) = a
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----------------------------------------------------------------
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-- | Set the files that GHC will load / compile.
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setTargetFiles :: (GhcMonad m) => [FilePath] -> m ()
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setTargetFiles [] = error "ghc-mod: setTargetFiles: No target files given"
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setTargetFiles files = do
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targets <- forM files $ \file -> G.guessTarget file Nothing
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G.setTargets targets
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-- | Adding the files to the targets.
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addTargetFiles :: (GhcMonad m) => [FilePath] -> m ()
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addTargetFiles [] = error "ghc-mod: addTargetFiles: No target files given"
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addTargetFiles files = do
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targets <- forM files $ \file -> G.guessTarget file Nothing
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mapM_ G.addTarget targets
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----------------------------------------------------------------
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-- | Return the 'DynFlags' currently in use in the GHC session.
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getDynamicFlags :: IO DynFlags
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getDynamicFlags = do
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mlibdir <- getSystemLibDir
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G.runGhc mlibdir G.getSessionDynFlags
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