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diff --git a/src/Text/Pandoc/Writers/Custom.hs b/src/Text/Pandoc/Writers/Custom.hs
deleted file mode 100644
index cf641dcd6..000000000
--- a/src/Text/Pandoc/Writers/Custom.hs
+++ /dev/null
@@ -1,322 +0,0 @@
-{-# OPTIONS_GHC -fno-warn-orphans #-}
-{-# LANGUAGE FlexibleInstances, OverloadedStrings,
-    ScopedTypeVariables, DeriveDataTypeable, CPP #-}
-#if MIN_VERSION_base(4,8,0)
-#else
-{-# LANGUAGE OverlappingInstances #-}
-#endif
-{- Copyright (C) 2012-2015 John MacFarlane <jgm@berkeley.edu>
-
-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.Writers.Custom
-   Copyright   : Copyright (C) 2012-2015 John MacFarlane
-   License     : GNU GPL, version 2 or above
-
-   Maintainer  : John MacFarlane <jgm@berkeley.edu>
-   Stability   : alpha
-   Portability : portable
-
-Conversion of 'Pandoc' documents to custom markup using
-a lua writer.
--}
-module Text.Pandoc.Writers.Custom ( writeCustom ) where
-import Text.Pandoc.Definition
-import Text.Pandoc.Options
-import Data.List ( intersperse )
-import Data.Char ( toLower )
-import Data.Typeable
-import Scripting.Lua (LuaState, StackValue, callfunc)
-import Text.Pandoc.Writers.Shared
-import qualified Scripting.Lua as Lua
-import qualified Text.Pandoc.UTF8 as UTF8
-import Control.Monad (when)
-import Control.Exception
-import qualified Data.Map as M
-import Text.Pandoc.Templates
-import GHC.IO.Encoding (getForeignEncoding,setForeignEncoding, utf8)
-
-attrToMap :: Attr -> M.Map String String
-attrToMap (id',classes,keyvals) = M.fromList
-    $ ("id", id')
-    : ("class", unwords classes)
-    : keyvals
-
-#if MIN_VERSION_hslua(0,4,0)
-#if MIN_VERSION_base(4,8,0)
-instance {-# OVERLAPS #-} StackValue [Char] where
-#else
-instance StackValue [Char] where
-#endif
-  push lua cs = Lua.push lua (UTF8.fromString cs)
-  peek lua i = do
-                 res <- Lua.peek lua i
-                 return $ UTF8.toString `fmap` res
-  valuetype _ = Lua.TSTRING
-#else
-#if MIN_VERSION_base(4,8,0)
-instance {-# OVERLAPS #-} StackValue a => StackValue [a] where
-#else
-instance StackValue a => StackValue [a] where
-#endif
-  push lua xs = do
-    Lua.createtable lua (length xs + 1) 0
-    let addValue (i, x) = Lua.push lua x >> Lua.rawseti lua (-2) i
-    mapM_ addValue $ zip [1..] xs
-  peek lua i = do
-    top <- Lua.gettop lua
-    let i' = if i < 0 then top + i + 1 else i
-    Lua.pushnil lua
-    lst <- getList lua i'
-    Lua.pop lua 1
-    return (Just lst)
-  valuetype _ = Lua.TTABLE
-
-getList :: StackValue a => LuaState -> Int -> IO [a]
-getList lua i' = do
-  continue <- Lua.next lua i'
-  if continue
-     then do
-       next <- Lua.peek lua (-1)
-       Lua.pop lua 1
-       x <- maybe (fail "peek returned Nothing") return next
-       rest <- getList lua i'
-       return (x : rest)
-     else return []
-#endif
-
-instance StackValue Format where
-  push lua (Format f) = Lua.push lua (map toLower f)
-  peek l n = fmap Format `fmap` Lua.peek l n
-  valuetype _ = Lua.TSTRING
-
-instance (StackValue a, StackValue b) => StackValue (M.Map a b) where
-  push lua m = do
-    let xs = M.toList m
-    Lua.createtable lua (length xs + 1) 0
-    let addValue (k, v) = Lua.push lua k >> Lua.push lua v >>
-                          Lua.rawset lua (-3)
-    mapM_ addValue xs
-  peek _ _ = undefined -- not needed for our purposes
-  valuetype _ = Lua.TTABLE
-
-instance (StackValue a, StackValue b) => StackValue (a,b) where
-  push lua (k,v) = do
-    Lua.createtable lua 2 0
-    Lua.push lua k
-    Lua.push lua v
-    Lua.rawset lua (-3)
-  peek _ _ = undefined -- not needed for our purposes
-  valuetype _ = Lua.TTABLE
-
-#if MIN_VERSION_base(4,8,0)
-instance {-# OVERLAPS #-} StackValue [Inline] where
-#else
-instance StackValue [Inline] where
-#endif
-  push l ils = Lua.push l =<< inlineListToCustom l ils
-  peek _ _ = undefined
-  valuetype _ = Lua.TSTRING
-
-#if MIN_VERSION_base(4,8,0)
-instance {-# OVERLAPS #-} StackValue [Block] where
-#else
-instance StackValue [Block] where
-#endif
-  push l ils = Lua.push l =<< blockListToCustom l ils
-  peek _ _ = undefined
-  valuetype _ = Lua.TSTRING
-
-instance StackValue MetaValue where
-  push l (MetaMap m) = Lua.push l m
-  push l (MetaList xs) = Lua.push l xs
-  push l (MetaBool x) = Lua.push l x
-  push l (MetaString s) = Lua.push l s
-  push l (MetaInlines ils) = Lua.push l ils
-  push l (MetaBlocks bs) = Lua.push l bs
-  peek _ _ = undefined
-  valuetype (MetaMap _) = Lua.TTABLE
-  valuetype (MetaList _) = Lua.TTABLE
-  valuetype (MetaBool _) = Lua.TBOOLEAN
-  valuetype (MetaString _) = Lua.TSTRING
-  valuetype (MetaInlines _) = Lua.TSTRING
-  valuetype (MetaBlocks _) = Lua.TSTRING
-
-instance StackValue Citation where
-  push lua cit = do
-    Lua.createtable lua 6 0
-    let addValue (k :: String, v) = Lua.push lua k >> Lua.push lua v >>
-                          Lua.rawset lua (-3)
-    addValue ("citationId", citationId cit)
-    addValue ("citationPrefix", citationPrefix cit)
-    addValue ("citationSuffix", citationSuffix cit)
-    addValue ("citationMode", show (citationMode cit))
-    addValue ("citationNoteNum", citationNoteNum cit)
-    addValue ("citationHash", citationHash cit)
-  peek = undefined
-  valuetype _ = Lua.TTABLE
-
-data PandocLuaException = PandocLuaException String
-    deriving (Show, Typeable)
-
-instance Exception PandocLuaException
-
--- | Convert Pandoc to custom markup.
-writeCustom :: FilePath -> WriterOptions -> Pandoc -> IO String
-writeCustom luaFile opts doc@(Pandoc meta _) = do
-  luaScript <- UTF8.readFile luaFile
-  enc <- getForeignEncoding
-  setForeignEncoding utf8
-  lua <- Lua.newstate
-  Lua.openlibs lua
-  status <- Lua.loadstring lua luaScript luaFile
-  -- check for error in lua script (later we'll change the return type
-  -- to handle this more gracefully):
-  when (status /= 0) $
-#if MIN_VERSION_hslua(0,4,0)
-    Lua.tostring lua 1 >>= throw . PandocLuaException . UTF8.toString
-#else
-    Lua.tostring lua 1 >>= throw . PandocLuaException
-#endif
-  Lua.call lua 0 0
-  -- TODO - call hierarchicalize, so we have that info
-  rendered <- docToCustom lua opts doc
-  context <- metaToJSON opts
-             (blockListToCustom lua)
-             (inlineListToCustom lua)
-             meta
-  Lua.close lua
-  setForeignEncoding enc
-  let body = rendered
-  case writerTemplate opts of
-       Nothing  -> return body
-       Just tpl -> return $ renderTemplate' tpl $ setField "body" body context
-
-docToCustom :: LuaState -> WriterOptions -> Pandoc -> IO String
-docToCustom lua opts (Pandoc (Meta metamap) blocks) = do
-  body <- blockListToCustom lua blocks
-  callfunc lua "Doc" body metamap (writerVariables opts)
-
--- | Convert Pandoc block element to Custom.
-blockToCustom :: LuaState      -- ^ Lua state
-              -> Block         -- ^ Block element
-              -> IO String
-
-blockToCustom _ Null = return ""
-
-blockToCustom lua (Plain inlines) = callfunc lua "Plain" inlines
-
-blockToCustom lua (Para [Image attr txt (src,tit)]) =
-  callfunc lua "CaptionedImage" src tit txt (attrToMap attr)
-
-blockToCustom lua (Para inlines) = callfunc lua "Para" inlines
-
-blockToCustom lua (LineBlock linesList) = callfunc lua "LineBlock" linesList
-
-blockToCustom lua (RawBlock format str) =
-  callfunc lua "RawBlock" format str
-
-blockToCustom lua HorizontalRule = callfunc lua "HorizontalRule"
-
-blockToCustom lua (Header level attr inlines) =
-  callfunc lua "Header" level inlines (attrToMap attr)
-
-blockToCustom lua (CodeBlock attr str) =
-  callfunc lua "CodeBlock" str (attrToMap attr)
-
-blockToCustom lua (BlockQuote blocks) = callfunc lua "BlockQuote" blocks
-
-blockToCustom lua (Table capt aligns widths headers rows') =
-  callfunc lua "Table" capt (map show aligns) widths headers rows'
-
-blockToCustom lua (BulletList items) = callfunc lua "BulletList" items
-
-blockToCustom lua (OrderedList (num,sty,delim) items) =
-  callfunc lua "OrderedList" items num (show sty) (show delim)
-
-blockToCustom lua (DefinitionList items) =
-  callfunc lua "DefinitionList" items
-
-blockToCustom lua (Div attr items) =
-  callfunc lua "Div" items (attrToMap attr)
-
--- | Convert list of Pandoc block elements to Custom.
-blockListToCustom :: LuaState -- ^ Options
-                  -> [Block]       -- ^ List of block elements
-                  -> IO String
-blockListToCustom lua xs = do
-  blocksep <- callfunc lua "Blocksep"
-  bs <- mapM (blockToCustom lua) xs
-  return $ mconcat $ intersperse blocksep bs
-
--- | Convert list of Pandoc inline elements to Custom.
-inlineListToCustom :: LuaState -> [Inline] -> IO String
-inlineListToCustom lua lst = do
-  xs <- mapM (inlineToCustom lua) lst
-  return $ concat xs
-
--- | Convert Pandoc inline element to Custom.
-inlineToCustom :: LuaState -> Inline -> IO String
-
-inlineToCustom lua (Str str) = callfunc lua "Str" str
-
-inlineToCustom lua Space = callfunc lua "Space"
-
-inlineToCustom lua SoftBreak = callfunc lua "SoftBreak"
-
-inlineToCustom lua (Emph lst) = callfunc lua "Emph" lst
-
-inlineToCustom lua (Strong lst) = callfunc lua "Strong" lst
-
-inlineToCustom lua (Strikeout lst) = callfunc lua "Strikeout" lst
-
-inlineToCustom lua (Superscript lst) = callfunc lua "Superscript" lst
-
-inlineToCustom lua (Subscript lst) = callfunc lua "Subscript" lst
-
-inlineToCustom lua (SmallCaps lst) = callfunc lua "SmallCaps" lst
-
-inlineToCustom lua (Quoted SingleQuote lst) = callfunc lua "SingleQuoted" lst
-
-inlineToCustom lua (Quoted DoubleQuote lst) = callfunc lua "DoubleQuoted" lst
-
-inlineToCustom lua (Cite cs lst) = callfunc lua "Cite" lst cs
-
-inlineToCustom lua (Code attr str) =
-  callfunc lua "Code" str (attrToMap attr)
-
-inlineToCustom lua (Math DisplayMath str) =
-  callfunc lua "DisplayMath" str
-
-inlineToCustom lua (Math InlineMath str) =
-  callfunc lua "InlineMath" str
-
-inlineToCustom lua (RawInline format str) =
-  callfunc lua "RawInline" format str
-
-inlineToCustom lua (LineBreak) = callfunc lua "LineBreak"
-
-inlineToCustom lua (Link attr txt (src,tit)) =
-  callfunc lua "Link" txt src tit (attrToMap attr)
-
-inlineToCustom lua (Image attr alt (src,tit)) =
-  callfunc lua "Image" alt src tit (attrToMap attr)
-
-inlineToCustom lua (Note contents) = callfunc lua "Note" contents
-
-inlineToCustom lua (Span attr items) =
-  callfunc lua "Span" items (attrToMap attr)