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module Text.Hakyll.RenderAction
( RenderAction (..)
, createRenderAction
, createSimpleRenderAction
, createManipulationAction
, chain
, runRenderAction
) where
import Prelude hiding ((.), id)
import Control.Category
import Control.Monad ((<=<), mplus)
import Text.Hakyll.Hakyll
import Text.Hakyll.Context
data RenderAction a b = RenderAction
{ actionDependencies :: [FilePath]
, actionUrl :: Maybe (Hakyll FilePath)
, actionFunction :: a -> Hakyll b
}
createRenderAction :: (a -> Hakyll b) -> RenderAction a b
createRenderAction f = RenderAction
{ actionDependencies = []
, actionUrl = Nothing
, actionFunction = f
}
createSimpleRenderAction :: Hakyll b -> RenderAction () b
createSimpleRenderAction = createRenderAction . const
instance Category RenderAction where
id = RenderAction
{ actionDependencies = []
, actionUrl = Nothing
, actionFunction = return
}
x . y = RenderAction
{ actionDependencies = actionDependencies x ++ actionDependencies y
, actionUrl = actionUrl y `mplus` actionUrl x
, actionFunction = actionFunction x <=< actionFunction y
}
createManipulationAction :: ContextManipulation -> RenderAction Context Context
createManipulationAction = createRenderAction . (return .)
chain :: [RenderAction a a] -> RenderAction a a
chain = foldl1 (>>>)
runRenderAction :: RenderAction () a -> Hakyll a
runRenderAction action = actionFunction action ()
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