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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, DeriveDataTypeable, GeneralizedNewtypeDeriving #-}
module Hakyll.Web.Pandoc.Biblio
( CSL
, cslCompiler
, Biblio (..)
, biblioCompiler
, pageReadPandocBiblio
) where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>))
import Control.Arrow (arr, returnA, (>>>))
import Data.Typeable (Typeable)
import Data.Binary (Binary (..))
import Text.Pandoc (Pandoc, ParserState (..))
import Text.Pandoc.Biblio (processBiblio)
import qualified Text.CSL as CSL
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler
import Hakyll.Core.Identifier
import Hakyll.Core.Writable
import Hakyll.Web.Page
import Hakyll.Web.Pandoc
--------------------------------------------------------------------------------
newtype CSL = CSL FilePath
deriving (Binary, Show, Typeable, Writable)
--------------------------------------------------------------------------------
cslCompiler :: Compiler () CSL
cslCompiler = getIdentifier >>> arr (CSL . toFilePath)
--------------------------------------------------------------------------------
newtype Biblio = Biblio [CSL.Reference]
deriving (Show, Typeable)
--------------------------------------------------------------------------------
instance Binary Biblio where
-- Ugly.
get = Biblio . read <$> get
put (Biblio rs) = put $ show rs
instance Writable Biblio where
write _ _ = return ()
--------------------------------------------------------------------------------
biblioCompiler :: Compiler () Biblio
biblioCompiler = getIdentifier >>>
arr toFilePath >>> unsafeCompiler CSL.readBiblioFile >>> arr Biblio
--------------------------------------------------------------------------------
pageReadPandocBiblio :: ParserState
-> Identifier CSL
-> Identifier Biblio
-> Compiler Page Pandoc
pageReadPandocBiblio state csl refs = proc page -> do
CSL csl' <- require_ csl -< ()
Biblio refs' <- require_ refs -< ()
-- 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 cits = map CSL.refId refs'
state' = state {stateCitations = stateCitations state ++ cits}
pandoc <- pageReadPandocWithA -< (state', page)
pandoc' <- unsafeCompiler processBiblio' -< (csl', refs', pandoc)
returnA -< pandoc'
where
processBiblio' (c, r, p) = processBiblio c Nothing r p
|
