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|
--------------------------------------------------------------------------------
-- | Wraps pandocs bibiliography handling
--
-- In order to add a bibliography, you will need a bibliography file (e.g.
-- @.bib@) and a CSL file (@.csl@). Both need to be compiled with their
-- respective compilers ('biblioCompiler' and 'cslCompiler'). Then, you can
-- refer to these files when you use 'pageReadPandocBiblio'. This function also
-- takes the reader options for completeness -- you can use
-- 'defaultHakyllReaderOptions' if you're unsure.
{-# LANGUAGE Arrows #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Hakyll.Web.Pandoc.Biblio
( CSL
, cslCompiler
, Biblio (..)
, biblioCompiler
, readPandocBiblio
) where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>))
import Data.Binary (Binary (..))
import Data.Traversable (traverse)
import Data.Typeable (Typeable)
import qualified Text.CSL as CSL
import Text.Pandoc (Pandoc, ReaderOptions (..))
import Text.Pandoc.Biblio (processBiblio)
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler
import Hakyll.Core.Identifier
import Hakyll.Core.Item
import Hakyll.Core.Writable
import Hakyll.Web.Pandoc
--------------------------------------------------------------------------------
data CSL = CSL
deriving (Show, Typeable)
--------------------------------------------------------------------------------
instance Binary CSL where
put CSL = return ()
get = return CSL
--------------------------------------------------------------------------------
instance Writable CSL where
-- Shouldn't be written.
write _ _ = return ()
--------------------------------------------------------------------------------
cslCompiler :: Compiler (Item CSL)
cslCompiler = makeItem CSL
--------------------------------------------------------------------------------
newtype Biblio = Biblio [CSL.Reference]
deriving (Show, Typeable)
--------------------------------------------------------------------------------
instance Binary Biblio where
-- Ugly.
get = Biblio . read <$> get
put (Biblio rs) = put $ show rs
--------------------------------------------------------------------------------
instance Writable Biblio where
-- Shouldn't be written.
write _ _ = return ()
--------------------------------------------------------------------------------
biblioCompiler :: Compiler (Item Biblio)
biblioCompiler = do
filePath <- toFilePath <$> getUnderlying
makeItem =<< unsafeCompiler (Biblio <$> CSL.readBiblioFile filePath)
--------------------------------------------------------------------------------
readPandocBiblio :: ReaderOptions
-> Maybe (Item CSL)
-> Item Biblio
-> (Item String)
-> Compiler (Item Pandoc)
readPandocBiblio ropt csl biblio item = do
-- Parse CSL file, if given
style <- unsafeCompiler $
traverse (CSL.readCSLFile . toFilePath . itemIdentifier) csl
-- We need to know the citation keys, add then *before* actually parsing the
-- actual page. If we don't do this, pandoc won't even consider them
-- citations!
let Biblio refs = itemBody biblio
ropt' = ropt {readerReferences = readerReferences ropt ++ refs}
pandoc = itemBody $ readPandocWith ropt' item
pandoc' = processBiblio style refs pandoc
return $ fmap (const pandoc') item
|
