lua filter, convert Para into RawBlock

["Agustín Martín" <agusmba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi, I'm new to lua, so forgive me if this is something basic.

I'm trying to create a filter to convert the text "{{pagebreak}}" into a 
docx page break. I know there are existing haskel filters for this, and 
that I could also use a raw block directly in my docx (I've done that 
already) but I wanted to scratch my itch and do it with a lua filter.

So far trying different approaches I have ended up with:

-- file: macro-expander.lua

function pagebreak_to_docx (inlines)

  if #inlines ~= 1 then return end
 if inlines[1].t == 'Str' and inlines[1].text == "{{pagebreak}}" then
   return pandoc.RawBlock{"openxml", "<w:p><w:r><w:br w:type=\"page\"
/></w:r></w:p>"}
 end
end

  function Para (c)
   return pagebreak_to_docx(c.content)
 end

Still when I run it with a basic example, I get the following error: 

Could not read list: Could not get Block value: Expected a string but got a 
nil

Right at the exact place where the {{pagebreak}} occurs.

Without the filter:

$ echo -e "Raw Block in md: \n\n\`\`\`{=openxml}\n<w:p>\n\`\`\` \n\nLua 
Filter Test: \n\n{{pagebreak}}" | pandoc -f markdown -t native
[Para [Str "Raw",Space,Str "Block",Space,Str "in",Space,Str "md:"]
,RawBlock (Format "openxml") "<w:p>"
,Para [Str "Lua",Space,Str "Filter",Space,Str "Test:"]
,Para [Str "{{pagebreak}}"]]

With the filter I'd expect the last Para to turn into a RawBlock but...

$ echo -e "Raw Block in md: \n\n\`\`\`{=openxml}\n<w:p>\n\`\`\` \n\nLua 
Filter Test: \n\n{{pagebreak}}" | pandoc -f markdown -t native 
--lua-filter="./macro-expander.lua"

Error running filter ./src/servicio-gestion-software/macro-expander.lua:
Could not read list: Could not get Block value: Expected a string but got a 
nil


Any help would be appreciated.
Thanks!

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