Yes!! Thank you very much.

It worked also converting to PDF (adding -o mydoc.pdf to the call with 
pandoc)

I tried to add text underline to the same lua function;

function Span(el)
  if FORMAT == "latex" and el.attributes.color then
    return { pandoc.RawInline("latex", "\\textcolor{" ..
  el.attributes.color .. "}"), el }
  elseif FORMAT == "latex" and el.attributes.text-decoration then
    return { pandoc.RawInline("latex", "\\underline{" ..
  el.attributes.text-decoration .. "}"), el }
  end
end 

with input 
[this is my text]{text-decoration=underline}

This gives an error `my_luafilter.lua:5: attempt to perform arithmetic on a 
nil value (field 'text')`
What did I wrong?


On Tuesday, May 5, 2020 at 10:59:17 PM UTC+2, John MacFarlane wrote:
>
>
> Try this one: 
>
> function Span(el) 
>   if FORMAT == "latex" and el.attributes.color then 
>     return { pandoc.RawInline("latex", "\\textcolor{" .. 
>   el.attributes.color .. "}"), el } 
>   end 
> end 
>
> Call with pandoc --lua-filter my_luafilter.lua -t latex 
>
> With input 
>
> [this is my text]{color=red} 
>
> (note = not :) you should get the right result. 
>
>
> "R. Wils" <rai...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <javascript:>> writes: 
>
> > Thank you very much for your reply. 
> > 
> > Pandoc is so nice but also very difficult to understand. 
> > I've never seen the lua language before. I'm quit familiar with Python 
> and 
> > Html but I've never seen lua code before. 
> > 
> > I've read the pages: 
> > - lua-filters.html 
> > Created a file: my_luafilter.lua 
> > 
> > with your function inside 
> > 
> > function Span(el) 
> >   if el.attributes.color then 
> >     return { pandoc.rawInline("latex", "\\textcolor{" .. 
> >   el.attributes.color .. "}"), el } 
> >   end 
> > end 
> > 
> > And in my pandoc.markdown file I added this: 
> > 
> > <span style="color:red">test</span> 
> > 
> > And added this filter to my pandoc command: 
> > --lua-filter=d:\\my_luafilter.lua 
> > 
> > Nothing happened. 
> > What did I wrong? 
> > 
> > Sorry to ask you all these questions 
> > I just need *colored text* and *underscore* for a markdown document I 
> > created and which I want to convert to PDF format. 
> > I'll learn every day a bit more about lua and lua filters. 
> > 
> > On Tuesday, May 5, 2020 at 6:15:06 PM UTC+2, John MacFarlane wrote: 
> >> 
> >> 
> >> Cleanest way is to use a Span with an attribute, plus a 
> >> lua filter that reacts to Spans with that attribute by 
> >> adding some LaTeX color commands. 
> >> 
> >> See the lua filter documentation and feel free to ask 
> >> if you have questions. 
> >> 
> >> Something like this (untested) 
> >> 
> >> function Span(el) 
> >>   if el.attributes.color then 
> >>     return { pandoc.rawInline("latex", "\\textcolor{" .. 
> >>   el.attributes.color .. "}"), el } 
> >>   end 
> >> end 
> >> 
> >> "R. Wils" <rai...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <javascript:>> writes: 
> >> 
> >> > Does anyone know how to color text in a PDF 
> >> > (converting from a pandoc.markdown text file)? 
> >> > 
> >> > I tried to use a span and div tag without success. 
> >> > 
> >> > (Sorry I'm a new pandoc user) 
> >> > 
> >> > -- 
> >> > You received this message because you are subscribed to the Google 
> >> Groups "pandoc-discuss" group. 
> >> > To unsubscribe from this group and stop receiving emails from it, 
> send 
> >> an email to pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <javascript:>. 
> >> > To view this discussion on the web visit 
> >> 
> https://groups.google.com/d/msgid/pandoc-discuss/5f7aae6a-8087-439d-874b-dcf547dd10b1%40googlegroups.com. 
>
> >> 
> >> 
> > 
> > -- 
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>
>

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