Re: Lua filters: accessing Images's 'fig:' attribute?

["jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <jmuccigr-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Some discussion on a similar issue (not showing the fig label in beamer 
while keeping the image centered) in the GitHub repo issues here 
<https://github.com/jgm/pandoc/issues/7988>.

I don't write too many filters, but isn't the "fig." bit stored in 
`img.title` for lua?
On Tuesday, 26 April 2022 at 13:41:57 UTC-4 Julien Dutant wrote:

> Hi,
>
> Pandoc's markdown `implicit_figures` extension parses blocks consisting of 
> a single image as figures. This shows up in the `native` output as `fig:` 
> attribute after the source. Compare without caption:
>
> % pandoc -t native
>
> ![](file.jpg)
>
> [ Para [ Image ( "" , [] , [] ) [] ( "file.jpg" , "" ) ] ]
> And with:
>
> ![caption](file.jpg)
>
> [ Para
>     [ Image
>         ( "" , [] , [] ) [ Str "caption" ] ( "file.jpg" , "fig:" )
>     ]
> ]
> We can't look up this attribute in Lua filters. Any reason not too? Is it 
> not part of the Pandoc AST, or doesn't fit neatly in current Lua types? 
>
> I'd like my filter to be aware of whether an image is treated as figure or 
> inline (e.g., to wrap the latter, but not the former, in a LaTeX center 
> environment). Perhaps others need this too. Atm my best bet is to redo 
> Pandoc's figure detection, i.e. (a) check if we're reading from markdown 
> with the implicit_headers extension,  (b) filter Para elements looking if 
> they contain only one Image with caption and if so tag it with some 
> `.is-a-figure` class, and then (c) make my Image filter aware of the 
> `.is-a-figure` class, and perhaps (d) clean up by removing the class. 
>
> J
>

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