Making a lua filter for short captions

Making a lua filter for short captions

[Greg Tucker-Kellogg]

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I'm trying to create a lua filter for short captions with latex output, so 
they can be used in `\listoffigures`. I have a filter that sort of kind of 
works for figures,
but it's obliterating other attributes (including the #fig needed for 
pandoc-crossref). I I'd like to fix this filter
to preserve the other attributes, and would appreciate any guidance on 
doing so.

I understand there is no current way to set attributes on tables, so that 
would have to be manual.

local utils = require 'pandoc.utils'

function Para (figure)
   if FORMAT =="latex" then
      if #figure.content == 1 and figure.content[1].t == 'Image' then
         local img = figure.content[1]
         if img.caption and img.attributes['short-caption'] then
            local short = img.attributes['short-caption']
            local long = utils.stringify(img.caption)
            return pandoc.Plain {
                     pandoc.RawInline('tex',"\\begin{figure}\n"),
                     pandoc.RawInline('tex','\\centering\n'),
                    
 pandoc.RawInline('tex',string.format("\\includegraphics{%s}\n",img.src)),
                    
 pandoc.RawInline('tex',string.format('\\caption[%s]{%s}\n',short,long)),
                     pandoc.RawInline('tex',"\\end{figure}\n")
            }
         end
      end
   end
end



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Re: Making a lua filter for short captions

[Albert Krewinkel]

If you keep the normal Image element in your output, then pandoc will
take care of image attributes, e.g.:

    ⋮
    return pandoc.Plain {
      pandoc.RawInline('tex', '\\begin{figure}\n'),
      img,
      pandoc.RawInline('tex', '\\end{figure}\n'),
    }
    ⋮

This way one can still leverage pandoc's LaTeX writer functionality
while getting more control over the output.

I wrote a short-caption filter some month ago; I'd write it a bit
differently nowadays:
https://gist.github.com/tarleb/a57366474bbeef4c4c388adc19e85a41

A clean and working filter would be a good addition to
https://github.com/pandoc/lua-filters. Please consider making a pull
request when you get your filter working.

Greg Tucker-Kellogg <gtuckerkellogg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> I'm trying to create a lua filter for short captions with latex output, so they can be used in `\listoffigures`. I have a filter that sort of kind of works for figures,
> but it's obliterating other attributes (including the #fig needed for pandoc-crossref). I I'd like to fix this filter
> to preserve the other attributes, and would appreciate any guidance on doing so.
>
> I understand there is no current way to set attributes on tables, so that would have to be manual.
>
> local utils = require 'pandoc.utils'
>
> function Para (figure)
> if FORMAT =="latex" then
> if #figure.content == 1 and figure.content[1].t == 'Image' then
> local img = figure.content[1]
> if img.caption and img.attributes['short-caption'] then
> local short = img.attributes['short-caption']
> local long = utils.stringify(img.caption)
> return pandoc.Plain {
> pandoc.RawInline('tex',"\\begin{figure}\n"),
> pandoc.RawInline('tex','\\centering\n'),
> pandoc.RawInline('tex',string.format("\\includegraphics{%s}\n",img.src)),
> pandoc.RawInline('tex',string.format('\\caption[%s]{%s}\n',short,long)),
> pandoc.RawInline('tex',"\\end{figure}\n")
> }
> end
> end
> end
> end

-- 
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124

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