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|
-- | This is the module which binds it all together
--
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Hakyll.Core.Run where
import Prelude hiding (reverse)
import Control.Applicative
import Control.Monad.Reader
import Control.Monad.State
import Control.Monad.Trans
import Control.Arrow ((&&&))
import Control.Monad (foldM, forM_, forM, filterM)
import Data.Map (Map)
import qualified Data.Map as M
import Data.Monoid (mempty, mappend)
import Data.Typeable (Typeable)
import Data.Binary (Binary)
import System.FilePath ((</>))
import Data.Set (Set)
import qualified Data.Set as S
import Hakyll.Core.Route
import Hakyll.Core.Identifier
import Hakyll.Core.Util.File
import Hakyll.Core.Compiler
import Hakyll.Core.Compiler.Internal
import Hakyll.Core.ResourceProvider
import Hakyll.Core.ResourceProvider.FileResourceProvider
import Hakyll.Core.Rules
import Hakyll.Core.DirectedGraph
import Hakyll.Core.DirectedGraph.Dot
import Hakyll.Core.DirectedGraph.DependencySolver
import Hakyll.Core.Writable
import Hakyll.Core.Store
import Hakyll.Core.CompiledItem
hakyll :: Rules -> IO ()
hakyll rules = do
store <- makeStore "_store"
provider <- fileResourceProvider
let ruleSet = runRules rules provider
compilers = rulesCompilers ruleSet
-- Extract the reader/state
reader = unHakyll $ addNewCompilers [] compilers
state' = runReaderT reader $ env ruleSet provider store
evalStateT state' state
where
env ruleSet provider store = HakyllEnvironment
{ hakyllRoute = rulesRoute ruleSet
, hakyllResourceProvider = provider
, hakyllStore = store
}
state = HakyllState
{ hakyllModified = S.empty
, hakyllGraph = mempty
}
data HakyllEnvironment = HakyllEnvironment
{ hakyllRoute :: Route
, hakyllResourceProvider :: ResourceProvider
, hakyllStore :: Store
}
data HakyllState = HakyllState
{ hakyllModified :: Set Identifier
, hakyllGraph :: DirectedGraph Identifier
}
newtype Hakyll a = Hakyll
{ unHakyll :: ReaderT HakyllEnvironment (StateT HakyllState IO) a
} deriving (Functor, Applicative, Monad)
-- | Return a set of modified identifiers
--
modified :: ResourceProvider -- ^ Resource provider
-> Store -- ^ Store
-> [Identifier] -- ^ Identifiers to check
-> IO (Set Identifier) -- ^ Modified resources
modified provider store ids = fmap S.fromList $ flip filterM ids $ \id' ->
if resourceExists provider id' then resourceModified provider id' store
else return False
-- | Add a number of compilers and continue using these compilers
--
addNewCompilers :: [(Identifier, Compiler () CompileRule)]
-- ^ Remaining compilers yet to be run
-> [(Identifier, Compiler () CompileRule)]
-- ^ Compilers to add
-> Hakyll ()
addNewCompilers oldCompilers newCompilers = Hakyll $ do
-- Get some information
provider <- hakyllResourceProvider <$> ask
store <- hakyllStore <$> ask
let -- All compilers
compilers = oldCompilers ++ newCompilers
-- Get all dependencies for the compilers
dependencies = flip map compilers $ \(id', compiler) ->
let deps = runCompilerDependencies compiler provider
in (id', deps)
-- Create a compiler map (Id -> Compiler)
compilerMap = M.fromList compilers
-- Create the dependency graph
currentGraph = fromList dependencies
-- Find the old graph and append the new graph to it. This forms the
-- complete graph
completeGraph <- mappend currentGraph . hakyllGraph <$> get
liftIO $ writeDot "dependencies.dot" show completeGraph
-- Check which items are up-to-date. This only needs to happen for the new
-- compilers
oldModified <- hakyllModified <$> get
newModified <- liftIO $ modified provider store $ map fst newCompilers
let modified' = oldModified `S.union` newModified
-- Find obsolete items. Every item that is reachable from a modified
-- item is considered obsolete. From these obsolete items, we are only
-- interested in ones that are in the current subgraph.
obsolete = S.filter (`member` currentGraph)
$ reachableNodes modified' $ reverse completeGraph
-- Solve the graph and retain only the obsolete items
ordered = filter (`S.member` obsolete) $ solveDependencies currentGraph
-- Join the order with the compilers again
orderedCompilers = map (id &&& (compilerMap M.!)) ordered
liftIO $ putStrLn "Adding compilers..."
liftIO $ putStrLn $ "Added: " ++ show (map fst orderedCompilers)
modify $ updateState modified' completeGraph
-- Now run the ordered list of compilers
unHakyll $ runCompilers orderedCompilers
where
-- Add the modified information for the new compilers
updateState modified' graph state = state
{ hakyllModified = modified'
, hakyllGraph = graph
}
runCompilers :: [(Identifier, Compiler () CompileRule)]
-- ^ Ordered list of compilers
-> Hakyll ()
-- ^ No result
runCompilers [] = return ()
runCompilers ((id', compiler) : compilers) = Hakyll $ do
-- Obtain information
route' <- hakyllRoute <$> ask
provider <- hakyllResourceProvider <$> ask
store <- hakyllStore <$> ask
modified' <- hakyllModified <$> get
let -- Determine the URL
url = runRoute route' id'
-- Check if the resource was modified
isModified = id' `S.member` modified'
-- Run the compiler
result <- liftIO $ runCompiler compiler id' provider url store isModified
liftIO $ putStrLn $ "Generated target: " ++ show id'
case result of
-- Compile rule for one item, easy stuff
CompileRule compiled -> do
case url of
Nothing -> return ()
Just r -> liftIO $ do
putStrLn $ "Routing " ++ show id' ++ " to " ++ r
let path = "_site" </> r
makeDirectories path
write path compiled
liftIO $ putStrLn ""
-- Continue for the remaining compilers
unHakyll $ runCompilers compilers
-- Metacompiler, slightly more complicated
MetaCompileRule newCompilers ->
-- Actually I was just kidding, it's not hard at all
unHakyll $ addNewCompilers compilers newCompilers
|
