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

182 lines
6.3 KiB
Haskell

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