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|
--------------------------------------------------------------------------------
module Hakyll.Core.Runtime
( run
) where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>))
import Control.Monad (filterM)
import Control.Monad.Error (ErrorT, runErrorT, throwError)
import Control.Monad.Reader (ask)
import Control.Monad.RWS (RWST, runRWST)
import Control.Monad.State (get, modify)
import Control.Monad.Trans (liftIO)
import Data.Map (Map)
import qualified Data.Map as M
import Data.Monoid (mempty)
import Data.Set (Set)
import qualified Data.Set as S
import System.FilePath ((</>))
--------------------------------------------------------------------------------
import Hakyll.Core.CompiledItem
import Hakyll.Core.Compiler.Internal
import Hakyll.Core.Compiler.Require
import Hakyll.Core.Configuration
import Hakyll.Core.Dependencies
import Hakyll.Core.Identifier
import Hakyll.Core.Logger
import Hakyll.Core.ResourceProvider
import Hakyll.Core.Routes
import Hakyll.Core.Rules.Internal
import Hakyll.Core.Store (Store)
import qualified Hakyll.Core.Store as Store
import Hakyll.Core.Util.File
import Hakyll.Core.Writable
--------------------------------------------------------------------------------
run :: Configuration -> Rules a -> IO RuleSet
run configuration rules = do
-- Initialization
logger <- makeLogger putStrLn
section logger "Initialising"
store <- timed logger "Creating store" $
Store.new (inMemoryCache configuration) $ storeDirectory configuration
provider <- timed logger "Creating provider" $
newResourceProvider store (ignoreFile configuration) "."
ruleSet <- timed logger "Running rules" $ runRules rules provider
-- Get old facts
mOldFacts <- Store.get store factsKey
let (oldFacts) = case mOldFacts of Store.Found f -> f
_ -> mempty
-- Build runtime read/state
let compilers = rulesCompilers ruleSet
read' = RuntimeRead
{ runtimeConfiguration = configuration
, runtimeLogger = logger
, runtimeProvider = provider
, runtimeStore = store
, runtimeRoutes = rulesRoutes ruleSet
, runtimeUniverse = compilers
}
state = RuntimeState
{ runtimeDone = S.empty
, runtimeTodo = M.empty
, runtimeFacts = oldFacts
}
-- Run the program and fetch the resulting state
result <- runErrorT $ runRWST build read' state
case result of
Left e -> thrown logger e
Right (_, s, _) -> Store.set store factsKey $ runtimeFacts s
-- Flush and return
flushLogger logger
return ruleSet
where
factsKey = ["Hakyll.Core.Runtime.run", "facts"]
--------------------------------------------------------------------------------
data RuntimeRead = RuntimeRead
{ runtimeConfiguration :: Configuration
, runtimeLogger :: Logger
, runtimeProvider :: ResourceProvider
, runtimeStore :: Store
, runtimeRoutes :: Routes
, runtimeUniverse :: [(Identifier, Compiler CompiledItem)]
}
--------------------------------------------------------------------------------
data RuntimeState = RuntimeState
{ runtimeDone :: Set Identifier
, runtimeTodo :: Map Identifier (Compiler CompiledItem)
, runtimeFacts :: DependencyFacts
}
--------------------------------------------------------------------------------
type Runtime a = RWST RuntimeRead () RuntimeState (ErrorT String IO) a
--------------------------------------------------------------------------------
build :: Runtime ()
build = do
scheduleOutOfDate
pickAndChase
--------------------------------------------------------------------------------
scheduleOutOfDate :: Runtime ()
scheduleOutOfDate = do
logger <- runtimeLogger <$> ask
provider <- runtimeProvider <$> ask
universe <- runtimeUniverse <$> ask
facts <- runtimeFacts <$> get
todo <- runtimeTodo <$> get
let identifiers = map fst universe
modified <- timed logger "Checking for modified items" $
fmap S.fromList $ flip filterM identifiers $
liftIO . resourceModified provider
let (ood, facts', _) = outOfDate identifiers modified facts
todo' = M.fromList
[(id', c) | (id', c) <- universe, id' `S.member` ood]
-- Update facts and todo items
modify $ \s -> s
{ runtimeDone = runtimeDone s `S.union`
(S.fromList identifiers `S.difference` ood)
, runtimeTodo = todo `M.union` todo'
, runtimeFacts = facts'
}
--------------------------------------------------------------------------------
pickAndChase :: Runtime ()
pickAndChase = do
todo <- runtimeTodo <$> get
case M.minViewWithKey todo of
Nothing -> return ()
Just ((id', _), _) -> do
chase [] id'
pickAndChase
--------------------------------------------------------------------------------
chase :: [Identifier] -> Identifier -> Runtime ()
chase trail id'
| id' `elem` trail = return () -- Cycle detected!
| otherwise = do
logger <- runtimeLogger <$> ask
todo <- runtimeTodo <$> get
provider <- runtimeProvider <$> ask
universe <- runtimeUniverse <$> ask
routes <- runtimeRoutes <$> ask
store <- runtimeStore <$> ask
config <- runtimeConfiguration <$> ask
section logger $ "Processing " ++ show id'
let compiler = todo M.! id'
read' = CompilerRead
{ compilerIdentifier = id'
, compilerProvider = provider
, compilerUniverse = map fst universe
, compilerRoutes = routes
, compilerStore = store
, compilerLogger = logger
}
result <- timed logger "Compiling" $ liftIO $ runCompiler compiler read'
case result of
-- Rethrow error
CompilerError e -> throwError e
-- Huge success
CompilerDone (CompiledItem compiled) facts -> do
-- Write if necessary
case runRoutes routes id' of
Nothing -> return ()
Just url -> timed logger ("Routing to " ++ url) $ do
let path = destinationDirectory config </> url
liftIO $ makeDirectories path
liftIO $ write path compiled
-- Save! (For require)
liftIO $ save store id' compiled
-- Update state
modify $ \s -> s
{ runtimeDone = S.insert id' (runtimeDone s)
, runtimeTodo = M.delete id' (runtimeTodo s)
, runtimeFacts = M.insert id' facts (runtimeFacts s)
}
-- Try something else first
CompilerRequire dep c -> do
-- Update the compiler so we don't execute it twice
depDone <- (dep `S.member`) . runtimeDone <$> get
modify $ \s -> s
{ runtimeTodo = M.insert id'
(if depDone then c else compilerResult result)
(runtimeTodo s)
}
-- If the required item is already compiled, continue, or, start
-- chasing that
if depDone then chase trail id' else chase (id' : trail) dep
|
