Re: Use --number-sections with markdown output

[Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>]

relayism <tamas.harkai-fWcQWCtGVWc@public.gmane.org> writes:

> I know --number-sections does not support markdown output, but how
> could I achieve this:
>
> I am converting a .docx to .md and the headings in word are configured
> to be numbered, when I convert to .md those numbers are lost.
>
> I'd like to have something like this
>
> # 1 title
> ## 1.1 subtitle
>
> ## 1.2 subtitle
>
> # 2 title
>
> ### 2.1.1 subsbutitle
>
> as output, where the numbers are not explicitly part of the docx raw
> text input, but could be appended in same way as --number-sections adds
> it to other formats

Here's a Lua filter that should do what you need. See
https://pandoc.org/lua-filters.html for details.

``` lua

function Pandoc (doc)
  doc.blocks = pandoc.utils.make_sections(true, nil, doc.blocks):walk {
    Div = function (div)
      if div.attributes.number then
        -- first child should be a heading
        local header = div.content[1]
        header.content = {div.attributes.number, pandoc.Space()}
          .. header.content
        header.attributes.number = nil
        return div.content
      end
    end
  }
  return doc
end

```

-- 
Albert Krewinkel
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