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Rework GhcModT monad stack

This commit is contained in:
Daniel Gröber 2014-07-22 19:45:48 +02:00
parent f95f7f89ce
commit f311efd90c
7 changed files with 96 additions and 85 deletions
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10
Language/Haskell/GhcMod/Internal.hs
View File

@ -31,20 +31,18 @@ module Language.Haskell.GhcMod.Internal (
, newGhcModEnv
, GhcModState
, defaultState
, Mode(..)
, GhcModWriter
, CompilerMode(..)
, GhcModLog
-- * Monad utilities
, runGhcMod
, runGhcModT'
, withErrorHandler
-- ** Conversion
, liftGhcMod
, toGhcModT
-- ** Accessing 'GhcModEnv' and 'GhcModState'
, options
, cradle
, getMode
, setMode
, getCompilerMode
, setCompilerMode
, withOptions
-- * 'Ghc' Choice
, (||>)

139
Language/Haskell/GhcMod/Monad.hs
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@ -6,34 +6,32 @@
module Language.Haskell.GhcMod.Monad (
-- * Monad Types
GhcMod
, GhcModT
GhcModT
, IOish
-- ** Environment, state and logging
, GhcModEnv(..)
, newGhcModEnv
, GhcModState
, GhcModState(..)
, defaultState
, Mode(..)
, GhcModWriter
, CompilerMode(..)
, GhcModLog
-- * Monad utilities
, runGhcMod
, runGhcModT
, runGhcModT'
, withErrorHandler
-- ** Conversion
, liftGhcMod
, toGhcModT
-- ** Accessing 'GhcModEnv' and 'GhcModState'
, options
, cradle
, getMode
, setMode
, getCompilerMode
, setCompilerMode
, withOptions
-- ** Exporting convenient modules
, module Control.Monad.Reader.Class
, module Control.Monad.Writer.Class
, module Control.Monad.State.Class
, module Control.Monad.Journal.Class
) where
#if __GLASGOW_HASKELL__ < 708
@ -77,20 +75,25 @@ import Data.Monoid (Monoid)
#endif
import Control.Applicative (Alternative)
import Control.Monad (MonadPlus, liftM, void)
import Control.Arrow (first)
import Control.Monad (MonadPlus, void, liftM)
import Control.Monad.Base (MonadBase, liftBase)
import Control.Monad.Reader.Class
import Control.Monad.State.Class
import Control.Monad.Trans.Class
#if __GLASGOW_HASKELL__ < 708
import Control.Monad.Trans.Maybe
#endif
-- Monad transformer stuff
import Control.Monad.Trans.Control (MonadBaseControl(..), StM, liftBaseWith,
control, liftBaseOp, liftBaseOp_)
import Control.Monad.Trans.RWS.Lazy (RWST(..), runRWST)
import Control.Monad.Trans.Class
import Control.Monad.Reader.Class
import Control.Monad.Writer.Class
import Control.Monad.Error (Error(..), ErrorT(..), MonadError)
import Control.Monad.State.Class
import Control.Monad.Error (Error(..), MonadError, ErrorT, runErrorT)
import Control.Monad.Reader (ReaderT, runReaderT)
import Control.Monad.State.Strict (StateT, runStateT)
import Control.Monad.Trans.Journal (JournalT, runJournalT)
import Control.Monad.Trans.Maybe (MaybeT)
import Control.Monad.Journal.Class
import Data.Maybe (fromJust, isJust)
import Data.IORef (IORef, readIORef, writeIORef, newIORef)
@ -106,15 +109,17 @@ data GhcModEnv = GhcModEnv {
, gmCradle :: Cradle
}
data GhcModState = GhcModState Mode deriving (Eq,Show,Read)
type GhcModLog = ()
data Mode = Simple | Intelligent deriving (Eq,Show,Read)
data GhcModState = GhcModState {
gmCompilerMode :: CompilerMode
} deriving (Eq,Show,Read)
data CompilerMode = Simple | Intelligent deriving (Eq,Show,Read)
defaultState :: GhcModState
defaultState = GhcModState Simple
type GhcModWriter = ()
data GhcModError = GMENoMsg
| GMEString String
| GMECabal
@ -132,20 +137,22 @@ instance Error GhcModError where
--
-- Basicially an @IOish m => m@ is a 'Monad' supporting arbitrary 'IO' and
-- exception handling. Usually this will simply be 'IO' but we parametrise it in
-- the exported API so users have the option to use a custom underlying monad.
-- the exported API so users have the option to use a custom inner monad.
type IOish m = (Functor m, MonadIO m, MonadBaseControl IO m)
type GhcMod a = GhcModT (ErrorT GhcModError IO) a
-- | The GhcMod monad transformer data type. This is basically a wrapper around
-- RWST with custom instances for 'GhcMonad' and it's constraints.
-- | The GhcMod monad transformer data type. This is basically a newtype wrapper
-- around 'StateT', 'ErrorT', 'JournalT' and 'ReaderT' with custom instances for
-- 'GhcMonad' and it's constraints.
--
-- The inner monad should have instances for 'MonadIO' and 'MonadBaseControl'
-- 'IO'. Most @mtl@ monads already have 'MonadBaseControl' 'IO' instances, see
-- the @monad-control@ package.
newtype GhcModT m a = GhcModT {
unGhcModT :: RWST GhcModEnv GhcModWriter GhcModState m a
} deriving (Functor
unGhcModT :: StateT GhcModState
(ErrorT GhcModError
(JournalT GhcModLog
(ReaderT GhcModEnv m) ) ) a
} deriving ( Functor
, Applicative
, Alternative
, Monad
@ -155,23 +162,29 @@ newtype GhcModT m a = GhcModT {
, Control.Monad.IO.Class.MonadIO
#endif
, MonadReader GhcModEnv
, MonadWriter GhcModWriter
, MonadWriter w
, MonadState GhcModState
, MonadTrans
, MonadError GhcModError
)
deriving instance MonadError GhcModError m => MonadError GhcModError (GhcModT m)
instance MonadTrans GhcModT where
lift = GhcModT . lift . lift . lift . lift
#if MONADIO_INSTANCES
instance (Monoid w, MonadIO m) => MonadIO (RWST r w s m) where
instance MonadIO m => MonadIO (StateT s m) where
liftIO = lift . liftIO
instance MonadIO m => MonadIO (ReaderT r m) where
liftIO = lift . liftIO
instance (Monoid w, MonadIO m) => MonadIO (JournalT w m) where
liftIO = lift . liftIO
instance (Error e, MonadIO m) => MonadIO (ErrorT e m) where
liftIO = lift . liftIO
instance (MonadIO m) => MonadIO (MaybeT m) where
instance MonadIO m => MonadIO (MaybeT m) where
liftIO = lift . liftIO
#endif
----------------------------------------------------------------
@ -231,18 +244,18 @@ newGhcModEnv opt dir = do
, gmCradle = c
}
-- | Run a @GhcModT m@ computation, i.e. one with a custom underlying monad.
--
-- You probably don't want this, look at 'runGhcMod' instead.
runGhcModT :: IOish m => Options -> GhcModT m a -> m a
-- | Run a @GhcModT m@ computation.
runGhcModT :: IOish m
=> Options
-> GhcModT m a
-> m (Either GhcModError a, GhcModLog)
runGhcModT opt action = do
env <- liftBase $ newGhcModEnv opt =<< getCurrentDirectory
(a,(_,_)) <- runGhcModT' env defaultState $ do
first (fmap fst) <$> (runGhcModT' env defaultState $ do
dflags <- getSessionDynFlags
defaultCleanupHandler dflags $ do
initializeFlagsWithCradle opt (gmCradle env)
action
return a
action)
-- | Run a computation inside @GhcModT@ providing the RWST environment and
-- initial state. This is a low level function, use it only if you know what to
@ -253,28 +266,12 @@ runGhcModT' :: IOish m
=> GhcModEnv
-> GhcModState
-> GhcModT m a
-> m (a,(GhcModState, GhcModWriter))
-> m (Either GhcModError (a, GhcModState), GhcModLog)
runGhcModT' r s a = do
(a',s',w) <- runRWST (unGhcModT $ initGhcMonad (Just libdir) >> a) r s
return (a',(s',w))
-- | Run a 'GhcMod' computation. If you want an underlying monad other than
-- 'ErrorT e IO' you should look at 'runGhcModT'
runGhcMod :: Options
-> GhcMod a
-> IO (Either GhcModError a)
runGhcMod o a =
runErrorT $ runGhcModT o a
liftErrorT :: IOish m => GhcModT m a -> GhcModT (ErrorT GhcModError m) a
liftErrorT action =
GhcModT $ RWST $ \e s -> ErrorT $ Right <$> (runRWST $ unGhcModT action) e s
-- | Lift @(GhcModT IO)@ into @GhcMod@, which is an alias for @GhcModT (ErrorT
-- GhcModError IO)@.
liftGhcMod :: GhcModT IO a -> GhcMod a
liftGhcMod = liftErrorT
(res, w') <-
flip runReaderT r $ runJournalT $ runErrorT $ flip runStateT s
$ (unGhcModT $ initGhcMonad (Just libdir) >> a)
return $ (res, w')
----------------------------------------------------------------
withErrorHandler :: IOish m => String -> GhcModT m a -> GhcModT m a
@ -300,13 +297,11 @@ options = gmOptions <$> ask
cradle :: IOish m => GhcModT m Cradle
cradle = gmCradle <$> ask
getMode :: IOish m => GhcModT m Mode
getMode = do
GhcModState mode <- get
return mode
getCompilerMode :: (Functor m, MonadState GhcModState m) => m CompilerMode
getCompilerMode = gmCompilerMode <$> get
setMode :: IOish m => Mode -> GhcModT m ()
setMode mode = put $ GhcModState mode
setCompilerMode :: MonadState GhcModState m => CompilerMode -> m ()
setCompilerMode mode = (\s -> put s { gmCompilerMode = mode } ) =<< get
----------------------------------------------------------------
@ -324,8 +319,10 @@ instance (MonadBaseControl IO m) => MonadBase IO (GhcModT m) where
instance (MonadBaseControl IO m) => MonadBaseControl IO (GhcModT m) where
newtype StM (GhcModT m) a = StGhcMod {
unStGhcMod :: StM (RWST GhcModEnv GhcModWriter GhcModState m) a }
unStGhcMod :: StM (StateT GhcModState
(ErrorT GhcModError
(JournalT GhcModLog
(ReaderT GhcModEnv m) ) ) ) a }
liftBaseWith f = GhcModT . liftBaseWith $ \runInBase ->
f $ liftM StGhcMod . runInBase . unGhcModT

4
Language/Haskell/GhcMod/Target.hs
View File

@ -15,7 +15,7 @@ setTargetFiles :: IOish m => [FilePath] -> GhcModT m ()
setTargetFiles files = do
targets <- forM files $ \file -> G.guessTarget file Nothing
G.setTargets targets
mode <- getMode
mode <- gmCompilerMode <$> get
if mode == Intelligent then
loadTargets Intelligent
else do
@ -47,7 +47,7 @@ setTargetFiles files = do
setIntelligent = do
newdf <- setModeIntelligent <$> G.getSessionDynFlags
void $ G.setSessionDynFlags newdf
setMode Intelligent
setCompilerMode Intelligent
needsFallback :: G.ModuleGraph -> Bool
needsFallback = any (hasTHorQQ . G.ms_hspp_opts)

2
ghc-mod.cabal
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@ -96,6 +96,7 @@ Library
, ghc-syb-utils
, hlint >= 1.8.61
, io-choice
, monad-journal
, old-time
, process
, syb
@ -180,6 +181,7 @@ Test-Suite spec
, ghc-syb-utils
, hlint >= 1.7.1
, io-choice
, monad-journal
, old-time
, process
, syb

6
src/GHCMod.hs
View File

@ -113,7 +113,7 @@ main = flip E.catches handlers $ do
nArgs n f = if length remainingArgs == n
then f
else E.throw (ArgumentsMismatch cmdArg0)
res <- runGhcModT opt $ case cmdArg0 of
(res, _) <- runGhcModT opt $ case cmdArg0 of
"list" -> modules
"lang" -> languages
"flag" -> flags
@ -136,7 +136,9 @@ main = flip E.catches handlers $ do
"version" -> return progVersion
"help" -> return $ O.usageInfo usage argspec
cmd -> E.throw (NoSuchCommand cmd)
putStr res
case res of
Right s -> putStr s
Left e -> error $ show e
where
handlers = [Handler (handleThenExit handler1), Handler (handleThenExit handler2)]
handleThenExit handler e = handler e >> exitFailure

6
src/GHCModi.hs
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@ -98,7 +98,11 @@ main = E.handle cmdHandler $
setCurrentDirectory rootdir
mvar <- liftIO newEmptyMVar
void $ forkIO $ setupDB mvar
runGhcModT opt $ loop S.empty mvar
(res, _) <- runGhcModT opt $ loop S.empty mvar
case res of
Right () -> return ()
Left e -> error $ show e
where
-- this is just in case.
-- If an error is caught here, it is a bug of GhcMod library.

14
test/TestUtils.hs
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@ -12,14 +12,22 @@ module TestUtils (
import Language.Haskell.GhcMod.Monad
import Language.Haskell.GhcMod.Types
import Control.Applicative
isolateCradle :: IOish m => GhcModT m a -> GhcModT m a
isolateCradle action =
local modifyEnv $ action
where
modifyEnv e = e { gmCradle = (gmCradle e) { cradlePkgDbStack = [GlobalDb] } }
extract :: IO (Either e a, w) -> IO a
extract action = do
(Right a, _) <- action
return a
runIsolatedGhcMod :: Options -> GhcModT IO a -> IO a
runIsolatedGhcMod opt action = runGhcModT opt $ isolateCradle action
runIsolatedGhcMod opt action = do
extract $ runGhcModT opt $ isolateCradle action
-- | Run GhcMod in isolated cradle with default options
runID = runIsolatedGhcMod defaultOptions
@ -29,8 +37,8 @@ runI = runIsolatedGhcMod
-- | Run GhcMod
run :: Options -> GhcModT IO a -> IO a
run = runGhcModT
run opt a = extract $ runGhcModT opt a
-- | Run GhcMod with default options
runD :: GhcModT IO a -> IO a
runD = runGhcModT defaultOptions
runD = extract . runGhcModT defaultOptions