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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.Exit (ExitCode (..), exitWith)
import System.FilePath ((</>))
--------------------------------------------------------------------------------
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.Item
import Hakyll.Core.Item.SomeItem
import Hakyll.Core.Logger (Logger)
import qualified Hakyll.Core.Logger as Logger
import Hakyll.Core.Provider
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 <- Logger.new Logger.Debug putStrLn
Logger.header logger "Initialising..."
Logger.message logger "Creating store..."
store <- Store.new (inMemoryCache configuration) $
storeDirectory configuration
Logger.message logger "Creating provider..."
provider <- newProvider store (ignoreFile configuration) "."
Logger.message logger "Running rules..."
ruleSet <- 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 -> do
Logger.error logger e
Logger.flush logger
exitWith $ ExitFailure 1
Right (_, s, _) -> do
Store.set store factsKey $ runtimeFacts s
Logger.flush logger
return ruleSet
where
factsKey = ["Hakyll.Core.Runtime.run", "facts"]
--------------------------------------------------------------------------------
data RuntimeRead = RuntimeRead
{ runtimeConfiguration :: Configuration
, runtimeLogger :: Logger
, runtimeProvider :: Provider
, runtimeStore :: Store
, runtimeRoutes :: Routes
, runtimeUniverse :: [(Identifier, Compiler SomeItem)]
}
--------------------------------------------------------------------------------
data RuntimeState = RuntimeState
{ runtimeDone :: Set Identifier
, runtimeTodo :: Map Identifier (Compiler SomeItem)
, runtimeFacts :: DependencyFacts
}
--------------------------------------------------------------------------------
type Runtime a = RWST RuntimeRead () RuntimeState (ErrorT String IO) a
--------------------------------------------------------------------------------
build :: Runtime ()
build = do
logger <- runtimeLogger <$> ask
Logger.header logger "Checking for out-of-date items"
scheduleOutOfDate
Logger.header logger "Compiling"
pickAndChase
Logger.header logger "Success"
--------------------------------------------------------------------------------
scheduleOutOfDate :: Runtime ()
scheduleOutOfDate = do
logger <- runtimeLogger <$> ask
provider <- runtimeProvider <$> ask
universe <- runtimeUniverse <$> ask
facts <- runtimeFacts <$> get
todo <- runtimeTodo <$> get
let identifiers = map fst universe
modified <- fmap S.fromList $ flip filterM identifiers $
liftIO . resourceModified provider
let (ood, facts', msgs) = outOfDate identifiers modified facts
todo' = M.fromList
[(id', c) | (id', c) <- universe, id' `S.member` ood]
-- Print messages
mapM_ (Logger.debug logger) msgs
-- 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
let compiler = todo M.! id'
read' = CompilerRead
{ compilerUnderlying = id'
, compilerProvider = provider
, compilerUniverse = map fst universe
, compilerRoutes = routes
, compilerStore = store
, compilerLogger = logger
}
result <- liftIO $ runCompiler compiler read'
case result of
-- Rethrow error
CompilerError e -> throwError e
-- Huge success
CompilerDone (SomeItem item) cwrite -> do
-- TODO: Sanity check on itemIdentifier?
let body = itemBody item
facts = compilerDependencies cwrite
cacheHits
| compilerCacheHits cwrite <= 0 = "updated"
| otherwise = "cached "
-- Print some info
Logger.message logger $ cacheHits ++ " " ++ show id'
-- Write if necessary
case runRoutes routes id' of
Nothing -> return ()
Just url -> do
let path = destinationDirectory config </> url
liftIO $ makeDirectories path
liftIO $ write path item
Logger.debug logger $ "Routed to " ++ path
-- Save! (For require)
liftIO $ save store id' body
-- 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
|
