Thanks Albert,

I changed it as you've indicated:

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 

That gave another error:
my_luafilter.lua:5: <name> expected near '['

On Wednesday, May 6, 2020 at 11:48:41 AM UTC+2, Albert Krewinkel wrote:
>
> R. Wils writes: 
>
> > 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? 
>
> The issue is with `el.attributes.text-decoration`. Minus/hyphens are 
> special in Lua, so Lua treats this as "substract `decoration` from 
> `el.attributes.text`. The solution is to use more explicit table-access 
> syntax: `el.attributes['text-decoration']`. 
>
>
> -- 
> Albert Krewinkel 
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124 
>

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