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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
-- | Reader function for plain text
--
readText :: ParserState -> String -> Pandoc
readText _ = Pandoc (Meta [] [] []) . return . Plain . return . Str
-- | Get a read function for a given extension.
--
readPandoc :: HakyllAction (FileType, String) Pandoc
readPandoc = createHakyllAction $ \(fileType, inp) -> do
parserState <- askHakyll pandocParserState
return $ readFunction fileType (readOptions parserState fileType) inp
where
readFunction ReStructuredText = readRST
readFunction LaTeX = readLaTeX
readFunction Markdown = readMarkdown
readFunction LiterateHaskellMarkdown = readMarkdown
readFunction Html = readHtml
readFunction Text = readText
readFunction t = error $ "Cannot render " ++ show t
readOptions options LiterateHaskellMarkdown = options
{ stateLiterateHaskell = True }
readOptions options _ = options
-- | Get a render function for a given extension.
--
getRenderFunction :: HakyllAction FileType (String -> String)
getRenderFunction = createHakyllAction $ \fileType -> case fileType of
Html -> return id
Text -> return id
UnknownFileType -> return id
_ -> 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
-- | Get a render action
--
renderPandoc :: HakyllAction Pandoc String
renderPandoc = createHakyllAction $ \p -> do
writerOptions <- askHakyll pandocWriterOptions
return $ writeHtmlString writerOptions p
-- | An action that renders the list of page sections to a context using pandoc
--
renderAction :: HakyllAction [PageSection] Context
renderAction = (arr id &&& (getFileType' >>> getRenderFunction))
>>> renderActionWith
where
getFileType' = arr $ getFileType . fromMaybe "unknown" . lookup "path"
. map (\(x, y, _) -> (x, y)) . map unPageSection
-- | An action to render pages, offering just a little more flexibility
--
renderActionWith :: HakyllAction ([PageSection], String -> String) Context
renderActionWith = createHakyllAction $ \(sections, render') -> return $
Context $ M.fromList $ map (renderTriple render' . unPageSection) sections
where
renderTriple render' (k, v, r) = second (if r then render' else id) (k, v)
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