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-- | Module exporting a pandoc arrow
--
module Text.Hakyll.Pandoc
( renderAction
, renderActionWith
) where
import Data.Maybe (fromMaybe)
import qualified Data.Map as M
import Control.Arrow (second, (>>>), arr)
import Text.Pandoc
import Text.Hakyll.Internal.FileType
import Text.Hakyll.Page
import Text.Hakyll.HakyllMonad
import Text.Hakyll.HakyllAction
import Text.Hakyll.Context
-- | Get a render function for a given extension.
--
getRenderFunction :: FileType -> Hakyll (String -> String)
getRenderFunction Html = return id
getRenderFunction Text = return id
getRenderFunction UnknownFileType = return id
getRenderFunction fileType = do
parserState <- askHakyll pandocParserState
writerOptions <- askHakyll pandocWriterOptions
return $ writeHtmlString writerOptions
. readFunction fileType (readOptions parserState fileType)
where
readFunction ReStructuredText = readRST
readFunction LaTeX = readLaTeX
readFunction Markdown = readMarkdown
readFunction LiterateHaskellMarkdown = readMarkdown
readFunction t = error $ "Cannot render " ++ show t
readOptions options LiterateHaskellMarkdown = options
{ stateLiterateHaskell = True }
readOptions options _ = options
-- | An action that renders the list of page sections to a context using pandoc
--
renderAction :: HakyllAction [PageSection] Context
renderAction = createHakyllAction $ \sections -> do
let path = fromMaybe "unknown" $ lookup "path"
$ map (\(x, y, _) -> (x, y))
$ map unPageSection sections
render' <- getRenderFunction $ getFileType path
runHakyllAction $ arr (const sections) >>> renderActionWith render'
-- | An action to render pages, offering just a little more flexibility
--
renderActionWith :: (String -> String) -> HakyllAction [PageSection] Context
renderActionWith render' = createHakyllAction $ \sections -> return $
Context $ M.fromList $ map (renderTriple . unPageSection) sections
where
renderTriple (k, v, r) = second (if r then render' else id) (k, v)
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