Re: Thoughts trying to write a Lua filter

[Samuele Pilleri <pillerisamuele-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Oh I see. Indeed, I couldn't find any documentation on that and only looked 
at a couple of examples, my bad. Can you please tell me where to find 
those? I could only find this one 
<https://github.com/pandoc/lua-filters/blob/master/short-captions/short-captions.lua> 
which however doesn't cover all cases (ie. is there one shortcut for image 
path as well?).

You don't say why this would be useful in your case -- could you elaborate?
>

I'm writing a filter to handle wrapfigure in LaTeX (and maybe other formats 
in the future, it would be cool if it could target HTML and DOCX/ODT as 
well). This is the syntax which I have in mind:

![Image caption](/path/to/image.png){.wrap width=3}

As I've previously pointed out the manual defines a specific behaviour for 
width and height attributes and states that when no unit is passed it's 
assumed to be pixels. However, in order to convert pixels to inches 
(without introducing a misleading behaviour not matched by the manual) for 
LaTeX output, the filter needs to know the DPI value, which can be 
overridden from the command line: knowing such value would allow me to 
write a function to handle different units passed (or not passed) as part 
of the value to the width attribute, complying with this section 
<https://pandoc.org/MANUAL.html#extension-link_attributes> of the manual. 
Still, given the complexity of the task I think it would be a better idea 
to let Pandoc handle this once for all, converting accordingly to the 
output format:

Dimensions are converted to inches for output in page-based formats like 
> LaTeX. Dimensions are converted to pixels for output in HTML-like formats.
>

Hope I made myself clear.

I'm reluctant to do that unless we add Underline as a proper INline 
> constructor
>

I agree with you.
More generally speaking, can we rely on classes and attributes as part of 
the sematics? If not, I think I have to redesign the syntax for this 
particular filter.
 

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