Manipulate Image in DOCX -> HTML using Lua Filter

Manipulate Image in DOCX -> HTML using Lua Filter

[Ken Dow]

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I'd like to modify the attributes of all images from a DOCX conversion to 
HTML in a Lua filter. So far:

function Image(el)
   el.classes = {"image"}
--   el.attributes = {"style", "mu"}
   return el
end


This el.classes line sets  the `img` class = "image". The el.attributes 
line removes the `img` tag from the output. What am I missing? 

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Re: Manipulate Image in DOCX -> HTML using Lua Filter

[Ken Dow]

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The following removes the `style="width100;height:100"` altogether, which 
is what I wanted:

function Image(el)
  el.attributes = {}
  return el
end


But this doesn't set anything - it also completely removes the style 
attribute. So I still don't understand see how `el.attributes` is supposed 
to work for images:

function Image(el)
  el.attributes = {["width"] = 101, ["height"] = 102}
  return el
end


On Friday, 9 August 2019 15:53:07 UTC-4, Ken Dow wrote:
>
> I'd like to modify the attributes of all images from a DOCX conversion to 
> HTML in a Lua filter. So far:
>
> function Image(el)
>    el.classes = {"image"}
> --   el.attributes = {"style", "mu"}
>    return el
> end
>
>
> This el.classes line sets  the `img` class = "image". The el.attributes 
> line removes the `img` tag from the output. What am I missing? 
>

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Re: Manipulate Image in DOCX -> HTML using Lua Filter

[Albert Krewinkel]

Ken Dow writes:

> The following removes the `style="width100;height:100"` altogether, which is what I wanted:
>
> function Image(el)
>   el.attributes = {}
>   return el
> end
>
> But this doesn't set anything - it also completely removes the style
> attribute. So I still don't understand see how `el.attributes` is
> supposed to work for images:
>
> function Image(el)
>   el.attributes = {["width"] = 101, ["height"] = 102}
>   return el
> end

Those are reasonable assumptions to make. The problems stems from the
fact that `el.attributes` isn't actually a key-value table, but a list
of tuples in disguise. Try this:

    el.attributes = {{"width", 101}, {"height", 102}}

We do this to preserve attribute order, which is not possible with a
plain key-value table.  There is some Lua-magic in place which makes the
attributes behave *as if* it was a key-value table, but it isn't. That
is why pandoc gets confused here.

Could you raise an issue over at https://github.com/jgm/pandoc/issues?
Your code is absolutely reasonable and we should make it work in the way
one would expect.


PS: Alternative solution: go via the `Attr` function, which deals with
    these tables in the way you expected.

        function Image (img)
          img.attr = pandoc.Attr(img.id, img.classes, {width=100, height=100})
          return img
        end


--
Albert Krewinkel
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