Thanks albert,
 The filter works as intended, with your permission may I include it in my 
github repo containing lua filters 
: https://github.com/Abhi-1U/tex-lua-filters

On Saturday, 16 July 2022 at 18:17:53 UTC+5:30 Albert Krewinkel wrote:

>
> Abhishek Ulayil <abhim...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > I was working on a lua filter to change the Table caption to add
> > numbering
> >
> > ```
> > tables = 0
> > function Table(el)
> > tables = tables + 1
> > local caption = "Table " .. tostring(tables) .. ": " ..
> > pandoc.utils.stringify(el.caption)
> > print(caption)
> >
> > el.caption = caption --facing problem here
> > return el
> > end
> > ```
> >
> > I am facing a problem to set the caption back to the element,
> >
> > what will be the correct way to set the caption.
>
> Captions consist of two parts, the normal (long) caption and a shorter
> (short) description that can be used in a list of tables, for example.
> The problematic line should be changed to
>
> el.caption.long = caption
>
> As you noticed, it's not very user-friendly though, and we should
> definitely improve that.
>
> You'll probably want to keep the markup in the caption. I'm attaching a
> version that's a bit longer, but will preserve the caption's markup.
>
> HTH!
>
>
> ```
> tables = 0
> function Table(el)
> tables = tables + 1
> local label = pandoc.Inlines("Table " .. tostring(tables))
> local caption = el.caption.long
> if not caption[1] then
> -- Table has no caption, just add the label
> caption = pandoc.Blocks{label}
> elseif caption[1].tag == 'Plain' or caption[1].tag == 'Para' then
> -- Prepend label to paragraph
> label:extend{pandoc.Str ':', pandoc.Space()}
> caption[1].content = label .. caption[1].content
> else
> -- Add label as plain block element
> label:extend{pandoc.Str ':', pandoc.Space()}
> caption:insert(1, pandoc.Plain(label))
> end
>
> el.caption.long = caption
> return el
> end
> ```
>

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