Added `Text.Pandoc.Writers.Custom`, `--print-custom-lua-writer`.

    pandoc -t data/sample.lua

will load the script sample.lua and use it as a custom writer.
data/sample.lua is provided as an example.

Added `--print-custom-lua-writer` option to print the sample
script.

6 files changed, 595 insertions, 11 deletions

diff --git a/README b/README
index 7efc00e26..22bce6de9 100644
--- a/README
+++ b/README
@@ -174,14 +174,16 @@ General options
     (Slidy HTML and javascript slide show), `slideous` (Slideous HTML and
     javascript slide show), `dzslides` (DZSlides HTML5 + javascript slide
     show), `revealjs` (reveal.js HTML5 + javascript slide show), `s5`
-    (S5 HTML and javascript slide show). Note that `odt`, `epub`, and
-    `epub3` output will not be directed to *stdout*; an output
-    filename must be specified using the `-o/--output` option. If `+lhs` is
-    appended to `markdown`, `rst`, `latex`, `beamer`, `html`, or `html5`, the
-    output will be rendered as literate Haskell source: see [Literate Haskell
-    support](#literate-haskell-support), below.  Markdown syntax extensions can
-    be individually enabled or disabled by appending `+EXTENSION` or
-    `-EXTENSION` to the format name, as described above under `-f`.
+    (S5 HTML and javascript slide show), or the path of a custom
+    lua writer (see [Custom writers](#custom-writers), below). Note that
+    `odt`, `epub`, and `epub3` output will not be directed to *stdout*; an
+    output filename must be specified using the `-o/--output` option. If
+    `+lhs` is appended to `markdown`, `rst`, `latex`, `beamer`, `html`, or
+    `html5`, the output will be rendered as literate Haskell source: see
+    [Literate Haskell support](#literate-haskell-support), below.  Markdown
+    syntax extensions can be individually enabled or disabled by appending
+    `+EXTENSION` or `-EXTENSION` to the format name, as described above
+    under `-f`.
 
 `-o` *FILE*, `--output=`*FILE*
 :   Write output to *FILE* instead of *stdout*.  If *FILE* is
@@ -301,6 +303,10 @@ General writer options
 :   Print the default template for an output *FORMAT*. (See `-t`
     for a list of possible *FORMAT*s.)
 
+`--print-sample-lua-writer`
+:   Print a sample lua custom writer (see [Custom writers](#custom-writers),
+    below.
+
 `--no-wrap`
 :   Disable text wrapping in output. By default, text is wrapped
     appropriately for the output format.
@@ -2622,6 +2628,23 @@ ordinary HTML (without bird tracks).
 writes HTML with the Haskell code in bird tracks, so it can be copied
 and pasted as literate Haskell source.
 
+Custom writers
+==============
+
+Pandoc can be extended with custom writers written in [lua].  (Pandoc
+includes a lua interpreter, so lua need not be installed separately.)
+
+To use a custom writer, simply specify the path to the lua script
+in place of the output format. For example:
+
+    pandoc -t data/sample.lua
+
+Creating a custom writer requires writing a lua function for each
+possible element in a pandoc document.  To get a documented example
+which you can modify according to your needs, do
+
+    pandoc --print-sample-lua-writer
+
 Authors
 =======
 
@@ -2668,3 +2691,5 @@ Sergey Astanin, Arlo O'Keeffe, Denis Laxalde, Brent Yorgey.
 [PDF]: http://www.adobe.com/pdf/
 [reveal.js]: http://lab.hakim.se/reveal-js/
 [FictionBook2]: http://www.fictionbook.org/index.php/Eng:XML_Schema_Fictionbook_2.1
+[lua]: TODO
+
diff --git a/data/sample.lua b/data/sample.lua
new file mode 100644
index 000000000..fe425b749
--- /dev/null
+++ b/data/sample.lua
@@ -0,0 +1,312 @@
+-- This is a sample custom writer for pandoc.  It produces output
+-- that is very similar to that of pandoc's HTML writer.
+-- There is one new feature: code blocks marked with class 'dot'
+-- are piped through graphviz and images are included in the HTML
+-- output using 'data:' URLs.
+--
+-- Invoke with: pandoc -t sample.lua
+--
+-- Note:  you need not have lua installed on your system to use this
+-- custom writer.  However, if you do have lua installed, you can
+-- use it to test changes to the script.  'lua sample.lua' will
+-- produce informative error messages if your code contains
+-- syntax errors.
+
+-- Character escaping
+local function escape(s, in_attribute)
+  return s:gsub("[<>&\"']",
+    function(x)
+      if x == '<' then
+        return '&lt;'
+      elseif x == '>' then
+        return '&gt;'
+      elseif x == '&' then
+        return '&amp;'
+      elseif x == '"' then
+        return '&quot;'
+      elseif x == "'" then
+        return '&#39;'
+      else
+        return x
+      end
+    end)
+end
+
+-- Helper function to convert an attributes table into
+-- a string that can be put into HTML tags.
+local function attributes(attr)
+  local attr_table = {}
+  for x,y in pairs(attr) do
+    if y and y ~= "" then
+      table.insert(attr_table, ' ' .. x .. '="' .. escape(y,true) .. '"')
+    end
+  end
+  return table.concat(attr_table)
+end
+
+-- Run cmd on a temporary file containing inp and return result.
+local function pipe(cmd, inp)
+  local tmp = os.tmpname()
+  local tmph = io.open(tmp, "w")
+  tmph:write(inp)
+  tmph:close()
+  local outh = io.popen(cmd .. " " .. tmp,"r")
+  local result = outh:read("*all")
+  outh:close()
+  os.remove(tmp)
+  return result
+end
+
+-- Table to store footnotes, so they can be included at the end.
+local notes = {}
+
+-- Blocksep is used to separate block elements.
+function Blocksep()
+  return "\n\n"
+end
+
+-- This function is called once for the whole document. Parameters:
+-- body, title, date are strings; authors is an array of strings;
+-- variables is a table.  One could use some kind of templating
+-- system here; this just gives you a simple standalone HTML file.
+function Doc(body, title, authors, date, variables)
+  local buffer = {}
+  local function add(s)
+    table.insert(buffer, s)
+  end
+  add('<!DOCTYPE html>')
+  add('<html>')
+  add('<head>')
+  add('<title>' .. title .. '</title>')
+  add('</head>')
+  add('<body>')
+  if title ~= "" then
+    add('<h1 class="title">' .. title .. '</h1>')
+  end
+  for _, author in pairs(authors) do
+    add('<h2 class="author">' .. author .. '</h2>')
+  end
+  if date ~= "" then
+    add('<h3 class="date">' .. date .. '</h3>')
+  end
+  add(body)
+  if #notes > 0 then
+    add('<ol class="footnotes">')
+    for _,note in pairs(notes) do
+      add(note)
+    end
+    add('</ol>')
+  end
+  add('</body>')
+  add('</html>')
+  return table.concat(buffer,'\n')
+end
+
+-- The functions that follow render corresponding pandoc elements.
+-- s is always a string, attr is always a table of attributes, and
+-- items is always an array of strings (the items in a list).
+-- Comments indicate the types of other variables.
+
+function Str(s)
+  return escape(s)
+end
+
+function Space()
+  return " "
+end
+
+function LineBreak()
+  return "<br/>"
+end
+
+function Emph(s)
+  return "<em>" .. s .. "</em>"
+end
+
+function Strong(s)
+  return "<strong>" .. s .. "</strong>"
+end
+
+function Subscript(s)
+  return "<sub>" .. s .. "</sub>"
+end
+
+function Superscript(s)
+  return "<sup>" .. s .. "</sup>"
+end
+
+function SmallCaps(s)
+  return '<span style="font-variant: small-caps;">' .. s .. '</span>'
+end
+
+function Strikeout(s)
+  return '<del>' .. s .. '</del>'
+end
+
+function Link(s, src, tit)
+  return "<a href='" .. escape(src,true) .. "' title='" ..
+         escape(tit,true) .. "'>" .. s .. "</a>"
+end
+
+function Image(s, src, tit)
+  return "<img src='" .. escape(src,true) .. "' title='" ..
+         escape(tit,true) .. "'/>"
+end
+
+function Code(s, attr)
+  return "<code" .. attributes(attr) .. ">" .. escape(s) .. "</code>"
+end
+
+function InlineMath(s)
+  return "\\(" .. escape(s) .. "\\)"
+end
+
+function DisplayMath(s)
+  return "\\[" .. escape(s) .. "\\]"
+end
+
+function Note(s)
+  local num = #notes + 1
+  -- insert the back reference right before the final closing tag.
+  s = string.gsub(s,
+          '(.*)</', '%1 <a href="#fnref' .. num ..  '">&#8617;</a></')
+  -- add a list item with the note to the note table.
+  table.insert(notes, '<li id="fn' .. num .. '">' .. s .. '</li>')
+  -- return the footnote reference, linked to the note.
+  return '<a id="fnref' .. num .. '" href="#fn' .. num ..
+            '"><sup>' .. num .. '</sup></a>'
+end
+
+function Plain(s)
+  return s
+end
+
+function Para(s)
+  return "<p>" .. s .. "</p>"
+end
+
+-- lev is an integer, the header level.
+function Header(lev, s, attr)
+  return "<h" .. lev .. attributes(attr) ..  ">" .. s .. "</h" .. lev .. ">"
+end
+
+function BlockQuote(s)
+  return "<blockquote>\n" .. s .. "\n</blockquote>"
+end
+
+function HorizontalRule()
+  return "<hr/>"
+end
+
+function CodeBlock(s, attr)
+  -- If code block has class 'dot', pipe the contents through dot
+  -- and base64, and include the base64-encoded png as a data: URL.
+  if attr.class and string.match(' ' .. attr.class .. ' ',' dot ') then
+    local png = pipe("base64", pipe("dot -Tpng", s))
+    return '<img src="data:image/png;base64,' .. png .. '"/>'
+  -- otherwise treat as code (one could pipe through a highlighter)
+  else
+    return "<pre><code" .. attributes(attr) .. ">" .. escape(s) ..
+           "</code></pre>"
+  end
+end
+
+function BulletList(items)
+  local buffer = {}
+  for _, item in pairs(items) do
+    table.insert(buffer, "<li>" .. item .. "</li>")
+  end
+  return "<ul>\n" .. table.concat(buffer, "\n") .. "\n</ul>"
+end
+
+function OrderedList(items)
+  local buffer = {}
+  for _, item in pairs(items) do
+    table.insert(buffer, "<li>" .. item .. "</li>")
+  end
+  return "<ol>\n" .. table.concat(buffer, "\n") .. "\n</ol>"
+end
+
+-- Revisit association list STackValue instance.
+function DefinitionList(items)
+  local buffer = {}
+  for _,item in pairs(items) do
+    for k, v in pairs(item) do
+      table.insert(buffer,"<dt>" .. k .. "</dt>\n<dd>" ..
+                        table.concat(v,"</dd>\n<dd>") .. "</dd>")
+    end
+  end
+  return "<dl>\n" .. table.concat(buffer, "\n") .. "\n</dl>"
+end
+
+-- Convert pandoc alignment to something HTML can use.
+-- align is AlignLeft, AlignRight, AlignCenter, or AlignDefault.
+function html_align(align)
+  if align == 'AlignLeft' then
+    return 'left'
+  elseif align == 'AlignRight' then
+    return 'right'
+  elseif align == 'AlignCenter' then
+    return 'center'
+  else
+    return 'left'
+  end
+end
+
+-- Caption is a string, aligns is an array of strings,
+-- widths is an array of floats, headers is an array of
+-- strings, rows is an array of arrays of strings.
+function Table(caption, aligns, widths, headers, rows)
+  local buffer = {}
+  local function add(s)
+    table.insert(buffer, s)
+  end
+  add("<table>")
+  if caption ~= "" then
+    add("<caption>" .. caption .. "</caption>")
+  end
+  if widths and widths[1] ~= 0 then
+    for _, w in pairs(widths) do
+      add('<col width="' .. string.format("%d%%", w * 100) .. '" />')
+    end
+  end
+  local header_row = {}
+  local empty_header = true
+  for i, h in pairs(headers) do
+    local align = html_align(aligns[i])
+    table.insert(header_row,'<th align="' .. align .. '">' .. h .. '</th>')
+    empty_header = empty_header and h == ""
+  end
+  if empty_header then
+    head = ""
+  else
+    add('<tr class="header">')
+    for _,h in pairs(header_row) do
+      add(h)
+    end
+    add('</tr>')
+  end
+  local class = "even"
+  for _, row in pairs(rows) do
+    class = (class == "even" and "odd") or "even"
+    add('<tr class="' .. class .. '">')
+    for i,c in pairs(row) do
+      add('<td align="' .. html_align(aligns[i]) .. '">' .. c .. '</td>')
+    end
+    add('</tr>')
+  end
+  add('</table')
+  return table.concat(buffer,'\n')
+end
+
+-- The following code will produce runtime warnings when you haven't defined
+-- all of the functions you need for the custom writer, so it's useful
+-- to include when you're working on a writer.
+local meta = {}
+meta.__index =
+  function(_, key)
+    io.stderr:write(string.format("WARNING: Undefined function '%s'\n",key))
+    return function() return "" end
+  end
+setmetatable(_G, meta)
+
diff --git a/pandoc.cabal b/pandoc.cabal
index 2d2af70cc..6011c0094 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -101,6 +101,8 @@ Data-Files:
                  data/dzslides/template.html,
                  -- data for citeproc
                  data/default.csl,
+                 -- sample lua custom writer
+                 data/sample.lua
                  -- documentation
                  README, INSTALL, COPYRIGHT, BUGS, changelog
 Extra-Source-Files:
@@ -253,7 +255,8 @@ Library
                  data-default >= 0.4 && < 0.6,
                  temporary >= 1.1 && < 1.2,
                  blaze-html >= 0.5 && < 0.7,
-                 blaze-markup >= 0.5.1 && < 0.6
+                 blaze-markup >= 0.5.1 && < 0.6,
+                 hslua >= 0.3 && < 0.4
   if flag(embed_data_files)
      cpp-options:   -DEMBED_DATA_FILES
      -- build-tools:   hsb2hs
@@ -305,6 +308,7 @@ Library
                    Text.Pandoc.Writers.RST,
                    Text.Pandoc.Writers.Org,
                    Text.Pandoc.Writers.AsciiDoc,
+                   Text.Pandoc.Writers.Custom,
                    Text.Pandoc.Writers.Textile,
                    Text.Pandoc.Writers.MediaWiki,
                    Text.Pandoc.Writers.RTF,
diff --git a/pandoc.hs b/pandoc.hs
index 7608ad017..1836fe345 100644
--- a/pandoc.hs
+++ b/pandoc.hs
@@ -327,6 +327,14 @@ options =
                   "FORMAT")
                  "" -- "Print default template for FORMAT"
 
+    , Option "" ["print-sample-lua-writer"]
+                 (NoArg
+                  (\_ -> do
+                    sample <- readDataFileUTF8 Nothing "sample.lua"
+                    UTF8.hPutStr stdout sample
+                    exitWith ExitSuccess))
+                  "" -- "Print sample lua custom writer"
+
     , Option "" ["no-wrap"]
                  (NoArg
                   (\opt -> return opt { optWrapText = False }))
diff --git a/src/Text/Pandoc.hs b/src/Text/Pandoc.hs
index cd2aa0fd3..0d1d6375e 100644
--- a/src/Text/Pandoc.hs
+++ b/src/Text/Pandoc.hs
@@ -99,6 +99,7 @@ module Text.Pandoc
                , writeFB2
                , writeOrg
                , writeAsciiDoc
+               , writeCustom
                -- * Rendering templates and default templates
                , module Text.Pandoc.Templates
                -- * Version
@@ -142,11 +143,12 @@ import Text.Pandoc.Writers.MediaWiki
 import Text.Pandoc.Writers.Textile
 import Text.Pandoc.Writers.Org
 import Text.Pandoc.Writers.AsciiDoc
+import Text.Pandoc.Writers.Custom
 import Text.Pandoc.Templates
 import Text.Pandoc.Options
 import Text.Pandoc.Shared (safeRead, warn)
 import Data.ByteString.Lazy (ByteString)
-import Data.List (intercalate)
+import Data.List (intercalate, isSuffixOf)
 import Data.Version (showVersion)
 import Text.JSON.Generic
 import Data.Set (Set)
@@ -286,7 +288,10 @@ getWriter s =
        Left e  -> Left $ intercalate "\n" $ [m | Message m <- errorMessages e]
        Right (writerName, setExts) ->
            case lookup writerName writers of
-                   Nothing  -> Left $ "Unknown writer: " ++ writerName
+                   Nothing
+                     | ".lua" `isSuffixOf` s ->
+                       Right $ IOStringWriter $ writeCustom s
+                     | otherwise -> Left $ "Unknown writer: " ++ writerName
                    Just (PureStringWriter r) -> Right $ PureStringWriter $
                            \o -> r o{ writerExtensions = setExts $
                                             getDefaultExtensions writerName }
diff --git a/src/Text/Pandoc/Writers/Custom.hs b/src/Text/Pandoc/Writers/Custom.hs
new file mode 100644
index 000000000..fc16a057e
--- /dev/null
+++ b/src/Text/Pandoc/Writers/Custom.hs
@@ -0,0 +1,230 @@
+{-# LANGUAGE OverlappingInstances, FlexibleInstances, OverloadedStrings #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{- Copyright (C) 2012 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 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 Scripting.Lua (LuaState, StackValue, callfunc)
+import qualified Scripting.Lua as Lua
+import Text.Pandoc.UTF8 (fromString, toString)
+import Data.ByteString (ByteString)
+import qualified Data.ByteString.Char8 as C8
+import Data.Monoid
+import qualified Data.Map as M
+
+attrToMap :: Attr -> M.Map ByteString ByteString
+attrToMap (id',classes,keyvals) = M.fromList
+    $ ("id", fromString id')
+    : ("class", fromString $ unwords classes)
+    : map (\(x,y) -> (fromString x, fromString y)) keyvals
+
+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 []
+
+instance StackValue ByteString where
+    push l x = Lua.push l $ C8.unpack x
+    peek l n = (fmap . fmap) C8.pack (Lua.peek l n)
+    valuetype _ = Lua.TSTRING
+
+instance StackValue a => StackValue [a] where
+  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
+
+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
+
+instance StackValue [Inline] where
+  push l ils = Lua.push l . C8.unpack =<< inlineListToCustom l ils
+  peek _ _ = undefined
+  valuetype _ = Lua.TSTRING
+
+instance StackValue [Block] where
+  push l ils = Lua.push l . C8.unpack =<< blockListToCustom l ils
+  peek _ _ = undefined
+  valuetype _ = Lua.TSTRING
+
+-- | Convert Pandoc to custom markup.
+writeCustom :: FilePath -> WriterOptions -> Pandoc -> IO String
+writeCustom luaFile opts doc = do
+  luaScript <- readFile luaFile
+  lua <- Lua.newstate
+  Lua.openlibs lua
+  Lua.loadstring lua luaScript "custom"
+  Lua.call lua 0 0
+  -- TODO - call hierarchicalize, so we have that info
+  rendered <- docToCustom lua opts doc
+  Lua.close lua
+  return $ toString rendered
+
+docToCustom :: LuaState -> WriterOptions -> Pandoc -> IO ByteString
+docToCustom lua opts (Pandoc (Meta title authors date) blocks) = do
+  title' <- inlineListToCustom lua title
+  authors' <- mapM (inlineListToCustom lua) authors
+  date' <- inlineListToCustom lua date
+  body <- blockListToCustom lua blocks
+  callfunc lua "Doc" body title' authors' date' (writerVariables opts)
+
+-- | Convert Pandoc block element to Custom.
+blockToCustom :: LuaState      -- ^ Lua state
+              -> Block         -- ^ Block element
+              -> IO ByteString
+
+blockToCustom _ Null = return ""
+
+blockToCustom lua (Plain inlines) = callfunc lua "Plain" inlines
+
+blockToCustom lua (Para [Image txt (src,tit)]) =
+  callfunc lua "CaptionedImage" src tit txt
+
+blockToCustom lua (Para inlines) = callfunc lua "Para" inlines
+
+blockToCustom lua (RawBlock format str) =
+  callfunc lua "RawBlock" format (fromString 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" (fromString 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
+
+-- | Convert list of Pandoc block elements to Custom.
+blockListToCustom :: LuaState -- ^ Options
+                  -> [Block]       -- ^ List of block elements
+                  -> IO ByteString
+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 ByteString
+inlineListToCustom lua lst = do
+  xs <- mapM (inlineToCustom lua) lst
+  return $ C8.concat xs
+
+-- | Convert Pandoc inline element to Custom.
+inlineToCustom :: LuaState -> Inline -> IO ByteString
+
+inlineToCustom lua (Str str) = callfunc lua "Str" $ fromString str
+
+inlineToCustom lua Space = callfunc lua "Space"
+
+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 _  lst) = callfunc lua "Cite" lst
+
+inlineToCustom lua (Code attr str) =
+  callfunc lua "Code" (fromString str) (attrToMap attr)
+
+inlineToCustom lua (Math DisplayMath str) =
+  callfunc lua "DisplayMath" (fromString str)
+
+inlineToCustom lua (Math InlineMath str) =
+  callfunc lua "InlineMath" (fromString str)
+
+inlineToCustom lua (RawInline format str) =
+  callfunc lua "RawInline" format (fromString str)
+
+inlineToCustom lua (LineBreak) = callfunc lua "LineBreak"
+
+inlineToCustom lua (Link txt (src,tit)) =
+  callfunc lua "Link" txt (fromString src) (fromString tit)
+
+inlineToCustom lua (Image alt (src,tit)) =
+  callfunc lua "Image" alt (fromString src) (fromString tit)
+
+inlineToCustom lua (Note contents) = callfunc lua "Note" contents
+