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+{-# LANGUAGE PatternGuards #-}
+{-
+Copyright (C) 2008 Andrea Rossato <andrea.rossato@ing.unitn.it>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+-}
+
+{- |
+ Module : Text.Pandoc.Biblio
+ Copyright : Copyright (C) 2008 Andrea Rossato
+ License : GNU GPL, version 2 or above
+
+ Maintainer : Andrea Rossato <andrea.rossato@ing.unitn.it>
+ Stability : alpha
+ Portability : portable
+-}
+
+module Text.Pandoc.Biblio ( processBiblio ) where
+
+import Control.Monad ( when )
+import Data.List
+import Text.CSL
+import Text.Pandoc.Definition
+
+-- | Process a 'Pandoc' document by adding citations formatted
+-- according to a CSL style, using 'citeproc' from citeproc-hs.
+processBiblio :: String -> [Reference] -> Pandoc -> IO Pandoc
+processBiblio cf r p
+ = if null r then return p
+ else do
+ when (null cf) $ error "Missing the needed citation style file"
+ csl <- readCSLFile cf
+ let groups = queryPandoc getCite p
+ result = citeproc csl r groups
+ cits_map = zip groups (citations result)
+ biblioList = map (read . renderPandoc' csl) (bibliography result)
+ Pandoc m b = processPandoc (processCite csl cits_map) p
+ return $ Pandoc m $ b ++ biblioList
+
+-- | Substitute 'Cite' elements with formatted citations.
+processCite :: Style -> [([Target],[FormattedOutput])] -> Inline -> Inline
+processCite s cs il
+ | Cite t _ <- il = Cite t (process t)
+ | otherwise = il
+ where
+ process t = case elemIndex t (map fst cs) of
+ Just i -> read . renderPandoc s $ snd (cs !! i)
+ Nothing -> [Str ("Error processing " ++ show t)]
+
+-- | Retrieve all citations from a 'Pandoc' docuument. To be used with
+-- 'queryPandoc'.
+getCite :: Inline -> [[(String,String)]]
+getCite i | Cite t _ <- i = [t]
+ | otherwise = []