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

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{-# LANGUAGE ScopedTypeVariables #-}
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module Language.Haskell.GhcMod.GHCApi (
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withGHC
, withGHCDummyFile
, initializeFlags
, initializeFlagsWithCradle
, 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, (<$>))
import Control.Monad (void, forM)
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import CoreMonad (liftIO)
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import Data.Maybe (isJust, fromJust)
import Distribution.PackageDescription (PackageDescription)
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import DynFlags (dopt_set)
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
import Language.Haskell.GhcMod.Cradle (userPackageDbOptsForGhc)
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import Language.Haskell.GhcMod.ErrMsg
import Language.Haskell.GhcMod.GHCChoice
import qualified Language.Haskell.GhcMod.Gap as Gap
import Language.Haskell.GhcMod.Types
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import System.Exit (exitSuccess)
import System.IO (hPutStr, hPrint, stderr)
import System.Process (readProcess)
----------------------------------------------------------------
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-- | 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)
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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.
-> Ghc (m a) -- ^ 'Ghc' actions created by the Ghc utilities.
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-> IO (m a)
withGHC file body = do
mlibdir <- getSystemLibDir
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ghandle ignore $ G.runGhc mlibdir $ do
dflags <- G.getSessionDynFlags
G.defaultCleanupHandler dflags body
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where
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ignore :: Alternative m => SomeException -> IO (m a)
ignore e = do
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hPutStr stderr $ file ++ ":0:0:Error:"
hPrint stderr e
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exitSuccess
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----------------------------------------------------------------
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)
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initializeFlagsWithCradle opt cradle ghcopts logging
| cabal = withCabal |||> withSandbox
| otherwise = withSandbox
where
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mCradleFile = cradleCabalFile cradle
cabal = isJust mCradleFile
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withCabal = do
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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)
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where
pkgDb = userPackageDbOptsForGhc $ cradlePackageDb cradle
compOpts
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| null pkgDb = CompilerOptions ghcopts importDirs []
| otherwise = CompilerOptions (ghcopts ++ pkgDb) [wdir,rdir] []
wdir = cradleCurrentDir cradle
rdir = cradleRootDir cradle
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----------------------------------------------------------------
initSession :: GhcMonad m => Build
-> Options
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-> CompilerOptions
-> Bool
-> 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
idirs = includeDirs compOpts
depPkgs = depPackages compOpts
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ls = lineSeparator opt
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setupDynamicFlags df0 = do
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
-- file or GHC session.
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
| splice = setSplice d4
| otherwise = d4
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where
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d1 = d0 { importPaths = idirs }
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d2 = d1 {
ghcLink = LinkInMemory
, hscTarget = HscInterpreted
}
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d3 = Gap.addDevPkgs d2 depPkgs
d4 | build == CabalPkg = Gap.setCabalPkg d3
| 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
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 ()
setTargetFiles [] = error "ghc-mod: setTargetFiles: No target files given"
setTargetFiles files = do
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targets <- forM files $ \file -> G.guessTarget file Nothing
G.setTargets targets
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-- | Adding the files to the targets.
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addTargetFiles :: (GhcMonad m) => [FilePath] -> m ()
addTargetFiles [] = error "ghc-mod: addTargetFiles: No target files given"
addTargetFiles files = do
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targets <- forM files $ \file -> G.guessTarget file Nothing
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
getDynamicFlags = do
mlibdir <- getSystemLibDir
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G.runGhc mlibdir G.getSessionDynFlags