Hello everyone,

In Pandoc 2.18, custom writers were added: 
https://pandoc.org/custom-writers.html#new-style

I tried to use it but it's not working and I don't know if it's an error or 
I'm using it the wrong way.

I have a lua filter
--
PANDOC_VERSION:must_be_at_least '2.18'
print(PANDOC_DOCUMENT)
function Writer(doc, opts)
print('We enter don\'t enter "Writer"')
return pandoc.write(doc, 'markdown', opts)
end

function Doc(body, meta, vars)
print('We enter don\'t enter "Doc"')
vars.date = vars.date or meta.data or os.date '%B %e, %Y'
return body, vars
end

function Pandoc(doc)
print('We enter "Pandoc"')
end

function Header(header)
print('We enter "Header"')
end
--
Command used "pandoc --standalone --verbose --lua-filter=sample.lua 
--output=output.md sample.md"

   - None of *Doc*, *Writer* is called.
   

   - "print(PANDOC_DOCUMENT)" returns "nil"
   

Some links
- https://github.com/jgm/pandoc/pull/7897 (The MR to see "Writer" was 
implemented)
- https://gist.github.com/tarleb/5a9c3fbfa47b0e6d3643efd8af2994b9 : exemple 
filter I tested but not working
- https://groups.google.com/g/pandoc-discuss/c/Ti4Qsehn1Z8/m/Btu_uE6IBwAJ: 
Question asked but another person before the fonctionnality was released. 
It does not contains an answer to my question

Question:
Does anyone have a minimal working example for "Doc" or "Writer" I could 
use?

Regards


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