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--------------------------------------------------------------------------------
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 Control.Monad.State (get, modify)
import Control.Monad.Writer (tell)
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 Hakyll.Core.Identifier
import Hakyll.Core.Identifier.Pattern
--------------------------------------------------------------------------------
data Dependency
= Pattern (Pattern ()) [Identifier ()]
| Identifier (Identifier ())
deriving (Show)
--------------------------------------------------------------------------------
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 Set (Identifier ()) -- ^ Initially out-of-date resources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' = modify $ \s -> s {dependencyOod = S.insert id' $ dependencyOod s}
--------------------------------------------------------------------------------
dependenciesFor :: Identifier () -> DependencyM [Identifier ()]
dependenciesFor id' = do
facts <- dependencyFacts <$> get
let relevant = fromMaybe [] $ M.lookup id' facts
return [i | Identifier i <- relevant]
--------------------------------------------------------------------------------
checkNew :: DependencyM ()
checkNew = do
universe <- ask
facts <- dependencyFacts <$> 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 <$> get
forM_ facts $ \(id', deps) -> do
deps' <- foldM (go id') [] deps
modify $ \s -> s
{dependencyFacts = M.insert id' deps' $ dependencyFacts s}
where
go _ ds (Identifier i) = return $ Identifier i : ds
go id' ds (Pattern p ls) = do
universe <- ask
let ls' = filterMatches p universe
if ls == ls'
then return $ Pattern p ls : ds
else do
tell [show id' ++ " is out-of-date because a pattern changed"]
markOod id'
return $ Pattern 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 <$> 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)
|