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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 a parser state for completeness -- you can use
-- 'defaultHakyllParserState' if you're unsure.
{-# LANGUAGE Arrows #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Hakyll.Web.Pandoc.Biblio
( CSL
, cslCompiler
, Biblio (..)
, biblioCompiler
, readPandocBiblio
) where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>))
import Data.Binary (Binary (..))
import Data.Typeable (Typeable)
import qualified Text.CSL as CSL
import Text.Pandoc (Pandoc, ParserState (..))
import Text.Pandoc.Biblio (processBiblio)
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler
import Hakyll.Core.Identifier
import Hakyll.Core.Item
import Hakyll.Core.Writable
import Hakyll.Web.Pandoc
--------------------------------------------------------------------------------
data CSL = CSL
deriving (Show, Typeable)
--------------------------------------------------------------------------------
instance Binary CSL where
put CSL = return ()
get = return CSL
--------------------------------------------------------------------------------
instance Writable CSL where
-- Shouldn't be written.
write _ _ = return ()
--------------------------------------------------------------------------------
cslCompiler :: Compiler (Item CSL)
cslCompiler = makeItem CSL
--------------------------------------------------------------------------------
newtype Biblio = Biblio [CSL.Reference]
deriving (Show, Typeable)
--------------------------------------------------------------------------------
instance Binary Biblio where
-- Ugly.
get = Biblio . read <$> 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 :: ParserState
-> Item CSL
-> Item Biblio
-> (Item String)
-> Compiler (Item Pandoc)
readPandocBiblio state csl biblio item = do
-- 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
cits = map CSL.refId refs
state' = state {stateCitations = stateCitations state ++ cits}
pandoc = itemBody $ readPandocWith state' item
cslPath = toFilePath $ itemIdentifier csl
pandoc' <- unsafeCompiler $ processBiblio cslPath Nothing refs pandoc
return $ fmap (const pandoc') item
|
