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

["'William Lupton' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>]

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I'll do that (maybe with a fallback on an output file name check). Thanks!

On Wed, 29 Mar 2023 at 09:49, BPJ <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org> wrote:

>
>
> 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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