Lua filters: store constructors in registry

Lua functions used to construct AST element values are stored in the Lua
registry for quicker access. Getting a value from the registry is much
faster than getting a global value (partly to idiosyncrasies of hslua);
this change results in a considerable performance boost.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/Text/Pandoc/Lua/Module/Pandoc.hs b/src/Text/Pandoc/Lua/Module/Pandoc.hs
index f458d4773..b9410a353 100644
--- a/src/Text/Pandoc/Lua/Module/Pandoc.hs
+++ b/src/Text/Pandoc/Lua/Module/Pandoc.hs
@@ -82,7 +82,7 @@ readDoc content formatSpecOrNil = do
           res <- liftIO $ runIO $ r def{ readerExtensions = es } (pack content)
           case res of
             Right pd -> (1 :: NumResults) <$ Lua.push pd -- success, push Pandoc
-            Left s   -> Lua.raiseError (show s)              -- error while reading
+            Left s   -> Lua.raiseError (show s)          -- error while reading
         _  -> Lua.raiseError "Only string formats are supported at the moment."
 
 -- | Pipes input through a command.