Re: How best to determine (in a lua filter) that PDF is being generated?

[BPJ <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org>]

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Den tis 28 mars 2023 19:38'William Lupton' via pandoc-discuss <
pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> skrev:

> Hello,
>
> I'm generating PDF using wkhtmltopdf, so "to" is "html" and I don't see
> the PDF engine in any of the globals. Should I just look at the output file
> name?
>

As a last resort I set a 'flag' in metadata and inspect that:

``````lua
local make_pdf
local Meta = function(meta)
  -- For use outside this function
  make_pdf = meta['my-filter-pdf']
  if not (make_pdf) then
    local includes = meta['header-includes']
    -- Make sure we have a list
    if 'List' ~= pandoc.utils.type(includes) then
      if nil == includes then
        includes = pandoc.List({ })
      else
        -- Assume the current value makes sense as a meta list item
        includes = pandoc.List({ includes })
      end
    end
    includes:insert(pandoc.RawBlock('html', [=[...]=]))
    meta['header-includes'] = includes
    return meta
  end
  return nil
end
return {
  { Meta = Meta },
  main_filter
}
``````

``````
% pandoc -L my-filter.lua -M my-filter-pdf ...
``````

At least guaranteed surprise free...


> Thanks,
> William
>
> PS, My filter adds some JavaScript to header-includes. I'm doing this as a
> RawBlock(html) but I think I need to omit it when the HTML will be
> converted to PDF (wkhtmltopdf complains).
>
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>

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