If --csl not specified, read from data files or default.

Thus --csl behaves like --reference-odt, --template, etc.

src/Text/Pandoc/Biblio.hs

@@ -29,7 +29,6 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 module Text.Pandoc.Biblio ( processBiblio ) where
 
-import Control.Monad ( when )
 import Data.List
 import Data.Unique
 import qualified Data.Map as M
@@ -39,12 +38,10 @@ 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
+processBiblio :: Style -> [Reference] -> Pandoc -> IO Pandoc
+processBiblio csl r p
     = if null r then return p
       else do
-        when (null cf) $ error "Missing the needed citation style file"
-        csl  <- readCSLFile cf
         p'   <- processWithM setHash p
         let (nts,grps) = if styleClass csl /= "note"
                          then (,) [] $ queryWith getCitation p'

src/pandoc.hs

@@ -42,7 +42,7 @@ import System.FilePath
 import System.Console.GetOpt
 import Data.Char ( toLower, isDigit )
 import Data.List ( intercalate, isSuffixOf )
-import System.Directory ( getAppUserDataDirectory )
+import System.Directory ( getAppUserDataDirectory, doesFileExist )
 import System.IO ( stdout, stderr )
 import qualified Text.Pandoc.UTF8 as UTF8
 #ifdef _CITEPROC
@@ -55,6 +55,7 @@ import Network.URI (parseURI, isURI, URI(..))
 import qualified Data.ByteString.Lazy as B
 import Data.ByteString.Lazy.UTF8 (toString, fromString)
 import Codec.Binary.UTF8.String (decodeString, encodeString)
+import Paths_pandoc (getDataFileName)
 
 copyrightMessage :: String
 copyrightMessage = "\nCopyright (C) 2006-2010 John MacFarlane\n" ++
@@ -164,7 +165,7 @@ data Opt = Opt
     , optDataDir           :: Maybe FilePath
 #ifdef _CITEPROC
     , optBibliography      :: [Reference]
-    , optCslFile           :: String
+    , optCslFile           :: FilePath
 #endif
     }
 
@@ -205,7 +206,7 @@ defaultOpts = Opt
     , optDataDir           = Nothing
 #ifdef _CITEPROC
     , optBibliography      = []
-    , optCslFile           = []
+    , optCslFile           = ""
 #endif
     }
 
@@ -532,7 +533,7 @@ options =
                  ""
     , Option "" ["csl"]
                  (ReqArg
-                  (\arg opt -> return opt { optCslFile = arg} )
+                  (\arg opt -> return opt { optCslFile = arg })
                   "FILENAME")
                  ""
 #endif
@@ -685,7 +686,7 @@ main = do
               , optDataDir           = mbDataDir
 #ifdef _CITEPROC
               , optBibliography      = refs
-              , optCslFile           = cslFile
+              , optCslFile           = cslfile
 #endif
              } = opts
 
@@ -838,13 +839,29 @@ main = do
 
   let convertTabs = tabFilter (if preserveTabs then 0 else tabStop)
 
+#ifdef _CITEPROC
+  cslfile' <- if null cslfile
+                 then do
+                   let defaultcsl = "default.csl"
+                   csldatafile <- getDataFileName defaultcsl
+                   case datadir of
+                        Nothing  -> return csldatafile
+                        Just u   -> do
+                          ex <- doesFileExist $ u </> defaultcsl
+                          if ex
+                             then return $ u </> defaultcsl
+                             else return csldatafile
+                 else return cslfile
+  csl <- readCSLFile cslfile'
+#endif
+
   doc <- fmap (reader startParserState . convertTabs . intercalate "\n") (readSources sources)
 
   let doc' = foldr ($) doc transforms
 
   doc'' <- do
 #ifdef _CITEPROC
-          processBiblio cslFile refs doc'
+          processBiblio csl refs doc'
 #else
           return doc'
 #endif