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-- | This is the module which binds it all together
--
module Hakyll.Core.Run where
import Control.Arrow ((&&&))
import Control.Monad (foldM, forM_, forM, filterM)
import Data.Map (Map)
import qualified Data.Map as M
import Data.Monoid (mempty)
import Data.Typeable (Typeable)
import Data.Binary (Binary)
import System.FilePath ((</>))
import Control.Applicative ((<$>))
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.DirectedGraph.ObsoleteFilter
import Hakyll.Core.Writable
import Hakyll.Core.Store
import Hakyll.Core.CompiledItem
hakyll :: Rules -> IO ()
hakyll rules = do
store <- makeStore "_store"
provider <- fileResourceProvider
hakyllWith rules provider store
hakyllWith :: Rules -> ResourceProvider -> Store -> IO ()
hakyllWith rules provider store = do
let -- Get the rule set
ruleSet = runRules rules provider
-- Get all identifiers and compilers
compilers = rulesCompilers ruleSet
-- Get all dependencies
dependencies = flip map compilers $ \(id', compiler) ->
let deps = runCompilerDependencies compiler provider
in (id', deps)
-- Create a compiler map
compilerMap = M.fromList compilers
-- Create the graph
graph = fromList dependencies
putStrLn "Writing dependency graph to dependencies.dot..."
writeDot "dependencies.dot" show graph
-- Check which items are up-to-date
modified' <- modified provider store $ map fst compilers
let -- Try to reduce the graph
reducedGraph = filterObsolete modified' graph
putStrLn "Writing reduced graph to reduced.dot..."
writeDot "reduced.dot" show reducedGraph
let -- Solve the graph
ordered = solveDependencies reducedGraph
-- Join the order with the compilers again
orderedCompilers = map (id &&& (compilerMap M.!)) ordered
-- Fetch the routes
route' = rulesRoute ruleSet
putStrLn $ show reducedGraph
putStrLn $ show ordered
-- Generate all the targets in order
_ <- mapM (addTarget route' modified') orderedCompilers
putStrLn "DONE."
where
addTarget route' modified' (id', comp) = do
let url = runRoute route' id'
-- Check if the resource was modified
let isModified = id' `S.member` modified'
-- Run the compiler
compiled <- runCompiler comp id' provider url store isModified
putStrLn $ "Generated target: " ++ show id'
case url of
Nothing -> return ()
Just r -> do
putStrLn $ "Routing " ++ show id' ++ " to " ++ r
let path = "_site" </> r
makeDirectories path
write path compiled
putStrLn ""
-- | 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
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