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|
--------------------------------------------------------------------------------
-- | Internally used compiler module
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Hakyll.Core.Compiler.Internal
( Dependencies
, DependencyEnvironment (..)
, CompilerEnvironment (..)
, Throwing
, CompilerM (..)
, Compiler (..)
, runCompilerJob
, runCompilerDependencies
, fromJob
, fromDependencies
, fromDependency
) where
--------------------------------------------------------------------------------
import Control.Applicative (Alternative (..), Applicative,
pure, (<$>), (<*>))
import Control.Arrow
import Control.Category (Category, id, (.))
import Control.Monad (liftM2, (<=<))
import Control.Monad.Error (ErrorT, catchError, runErrorT,
throwError)
import Control.Monad.Reader (Reader, ReaderT, ask, runReader,
runReaderT)
import Data.Set (Set)
import qualified Data.Set as S
import Prelude hiding (id, (.))
--------------------------------------------------------------------------------
import Hakyll.Core.Identifier
import Hakyll.Core.Logger
import Hakyll.Core.ResourceProvider
import Hakyll.Core.Routes
import Hakyll.Core.Store
import Hakyll.Core.Util.Arrow
--------------------------------------------------------------------------------
-- | A set of dependencies
type Dependencies = Set (Identifier ())
--------------------------------------------------------------------------------
-- | Environment in which the dependency analyzer runs
data DependencyEnvironment = DependencyEnvironment
{ -- | Target identifier
dependencyIdentifier :: Identifier ()
, -- | List of available identifiers we can depend upon
dependencyUniverse :: [Identifier ()]
}
--------------------------------------------------------------------------------
-- | Environment in which a compiler runs
data CompilerEnvironment = CompilerEnvironment
{ -- | Target identifier
compilerIdentifier :: Identifier ()
, -- | Resource provider
compilerResourceProvider :: ResourceProvider
, -- | List of all known identifiers
compilerUniverse :: [Identifier ()]
, -- | Site routes
compilerRoutes :: Routes
, -- | Compiler store
compilerStore :: Store
, -- | Flag indicating if the underlying resource was modified
compilerResourceModified :: Bool
, -- | Logger
compilerLogger :: Logger
}
--------------------------------------------------------------------------------
-- | A calculation possibly throwing an error
type Throwing a = Either String a
--------------------------------------------------------------------------------
-- | The compiler monad
newtype CompilerM a = CompilerM
{ unCompilerM :: ErrorT String (ReaderT CompilerEnvironment IO) a
} deriving (Monad, Functor, Applicative)
--------------------------------------------------------------------------------
-- | The compiler arrow
data Compiler a b = Compiler
{ compilerDependencies :: Reader DependencyEnvironment Dependencies
, compilerJob :: a -> CompilerM b
}
--------------------------------------------------------------------------------
instance Functor (Compiler a) where
fmap f (Compiler d j) = Compiler d $ fmap f . j
{-# INLINE fmap #-}
--------------------------------------------------------------------------------
instance Applicative (Compiler a) where
pure = fromJob . const . return
{-# INLINE pure #-}
Compiler d1 j1 <*> Compiler d2 j2 =
Compiler (liftM2 S.union d1 d2) $ \x -> j1 x <*> j2 x
{-# INLINE (<*>) #-}
--------------------------------------------------------------------------------
instance Alternative (Compiler a) where
empty = fromJob $ const $ CompilerM $
throwError "Hakyll.Core.Compiler.Internal: empty alternative"
Compiler d1 j1 <|> Compiler d2 j2 =
Compiler (liftM2 S.union d1 d2) $ \x -> CompilerM $
catchError (unCompilerM $ j1 x) (\_ -> unCompilerM $ j2 x)
{-# INLINE (<|>) #-}
--------------------------------------------------------------------------------
instance Category Compiler where
id = Compiler (return S.empty) return
{-# INLINE id #-}
Compiler d1 j1 . Compiler d2 j2 =
Compiler (liftM2 S.union d1 d2) (j1 <=< j2)
{-# INLINE (.) #-}
--------------------------------------------------------------------------------
instance Arrow Compiler where
arr f = fromJob (return . f)
{-# INLINE arr #-}
first (Compiler d j) = Compiler d $ \(x, y) -> do
x' <- j x
return (x', y)
{-# INLINE first #-}
second (Compiler d j) = Compiler d $ \(x, y) -> do
y' <- j y
return (x, y')
{-# INLINE second #-}
Compiler d1 j1 *** Compiler d2 j2 =
Compiler (liftM2 S.union d1 d2) $ \(x, y) -> do
x' <- j1 x
y' <- j2 y
return (x', y')
{-# INLINE (***) #-}
Compiler d1 j1 &&& Compiler d2 j2 =
Compiler (liftM2 S.union d1 d2) $ \x -> do
y1 <- j1 x
y2 <- j2 x
return (y1, y2)
{-# INLINE (&&&) #-}
--------------------------------------------------------------------------------
instance ArrowChoice Compiler where
left (Compiler d j) = Compiler d $ \e -> case e of
Left l -> Left <$> j l
Right r -> Right <$> return r
{-# INLINE left #-}
Compiler d1 j1 ||| Compiler d2 j2 = Compiler (liftM2 S.union d1 d2) $
\e -> case e of Left x -> j1 x; Right y -> j2 y
{-# INLINE (|||) #-}
--------------------------------------------------------------------------------
instance ArrowMap Compiler where
mapA (Compiler d j) = Compiler d $ mapM j
{-# INLINE mapA #-}
--------------------------------------------------------------------------------
-- | Run a compiler, yielding the resulting target
runCompilerJob :: Compiler () a -- ^ Compiler to run
-> Identifier () -- ^ Target identifier
-> ResourceProvider -- ^ Resource provider
-> [Identifier ()] -- ^ Universe
-> Routes -- ^ Route
-> Store -- ^ Store
-> Bool -- ^ Was the resource modified?
-> Logger -- ^ Logger
-> IO (Throwing a) -- ^ Result
runCompilerJob compiler id' provider universe route store modified logger =
runReaderT (runErrorT $ unCompilerM $ compilerJob compiler ()) env
where
env = CompilerEnvironment
{ compilerIdentifier = id'
, compilerResourceProvider = provider
, compilerUniverse = universe
, compilerRoutes = route
, compilerStore = store
, compilerResourceModified = modified
, compilerLogger = logger
}
--------------------------------------------------------------------------------
runCompilerDependencies :: Compiler () a
-> Identifier ()
-> [Identifier ()]
-> Dependencies
runCompilerDependencies compiler identifier universe =
runReader (compilerDependencies compiler) env
where
env = DependencyEnvironment
{ dependencyIdentifier = identifier
, dependencyUniverse = universe
}
--------------------------------------------------------------------------------
fromJob :: (a -> CompilerM b) -> Compiler a b
fromJob = Compiler $ return S.empty
{-# INLINE fromJob #-}
--------------------------------------------------------------------------------
fromDependencies :: (Identifier () -> [Identifier ()] -> [Identifier ()])
-> Compiler b b
fromDependencies collectDeps = flip Compiler return $ do
DependencyEnvironment identifier universe <- ask
return $ S.fromList $ collectDeps identifier universe
--------------------------------------------------------------------------------
-- | Wait until another compiler has finished before running this compiler
fromDependency :: Identifier a -> Compiler b b
fromDependency = fromDependencies . const . const . return . castIdentifier
|
