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--------------------------------------------------------------------------------
{-# LANGUAGE DeriveDataTypeable #-}
module Hakyll.Core.Dependencies
( Dependency (..)
, DependencyFacts
, outOfDate
) where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>), (<*>))
import Control.Monad (foldM, forM_, unless, when)
import Control.Monad.Reader (ask)
import Control.Monad.RWS (RWS, runRWS)
import qualified Control.Monad.State as State
import Control.Monad.Writer (tell)
import Data.Binary (Binary (..), getWord8,
putWord8)
import Data.List (find)
import Data.Map (Map)
import qualified Data.Map as M
import Data.Maybe (fromMaybe)
import Data.Set (Set)
import qualified Data.Set as S
import Data.Typeable (Typeable)
--------------------------------------------------------------------------------
import Hakyll.Core.Identifier
import Hakyll.Core.Identifier.Pattern
--------------------------------------------------------------------------------
data Dependency
= PatternDependency Pattern [Identifier]
| IdentifierDependency Identifier
deriving (Show, Typeable)
--------------------------------------------------------------------------------
instance Binary Dependency where
put (PatternDependency p is) = putWord8 0 >> put p >> put is
put (IdentifierDependency i) = putWord8 1 >> put i
get = getWord8 >>= \t -> case t of
0 -> PatternDependency <$> get <*> get
1 -> IdentifierDependency <$> get
_ -> error "Data.Binary.get: Invalid Dependency"
--------------------------------------------------------------------------------
type DependencyFacts = Map Identifier [Dependency]
--------------------------------------------------------------------------------
outOfDate
:: [Identifier] -- ^ All known identifiers
-> Set Identifier -- ^ Initially out-of-date resources
-> DependencyFacts -- ^ Old dependency facts
-> (Set Identifier, DependencyFacts, [String])
outOfDate universe ood oldFacts =
let (_, state, logs) = runRWS rws universe (DependencyState oldFacts ood)
in (dependencyOod state, dependencyFacts state, logs)
where
rws = do
checkNew
checkChangedPatterns
bruteForce
--------------------------------------------------------------------------------
data DependencyState = DependencyState
{ dependencyFacts :: DependencyFacts
, dependencyOod :: Set Identifier
} deriving (Show)
--------------------------------------------------------------------------------
type DependencyM a = RWS [Identifier] [String] DependencyState a
--------------------------------------------------------------------------------
markOod :: Identifier -> DependencyM ()
markOod id' = State.modify $ \s ->
s {dependencyOod = S.insert id' $ dependencyOod s}
--------------------------------------------------------------------------------
dependenciesFor :: Identifier -> DependencyM [Identifier]
dependenciesFor id' = do
facts <- dependencyFacts <$> State.get
let relevant = fromMaybe [] $ M.lookup id' facts
return [i | IdentifierDependency i <- relevant]
--------------------------------------------------------------------------------
checkNew :: DependencyM ()
checkNew = do
universe <- ask
facts <- dependencyFacts <$> State.get
forM_ universe $ \id' -> unless (id' `M.member` facts) $ do
tell [show id' ++ " is out-of-date because it is new"]
markOod id'
--------------------------------------------------------------------------------
checkChangedPatterns :: DependencyM ()
checkChangedPatterns = do
facts <- M.toList . dependencyFacts <$> State.get
forM_ facts $ \(id', deps) -> do
deps' <- foldM (go id') [] deps
State.modify $ \s -> s
{dependencyFacts = M.insert id' deps' $ dependencyFacts s}
where
go _ ds (IdentifierDependency i) = return $ IdentifierDependency i : ds
go id' ds (PatternDependency p ls) = do
universe <- ask
let ls' = filterMatches p universe
if ls == ls'
then return $ PatternDependency p ls : ds
else do
tell [show id' ++ " is out-of-date because a pattern changed"]
markOod id'
return $ PatternDependency p ls' : ds
--------------------------------------------------------------------------------
bruteForce :: DependencyM ()
bruteForce = do
todo <- ask
go todo
where
go todo = do
(todo', changed) <- foldM check ([], False) todo
when changed (go todo')
check (todo, changed) id' = do
deps <- dependenciesFor id'
ood <- dependencyOod <$> State.get
case find (`S.member` ood) deps of
Nothing -> return (id' : todo, changed)
Just d -> do
tell [show id' ++ " is out-of-date because " ++
show d ++ " is out-of-date"]
markOod id'
return (todo, True)
|
