Re: Lua filter process LaTeX

[Thomas Hodgson <thomas.hodgson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I think that the regex was partly the problem. This does what I want, as 
long as there is a line break after the end of the `\caption`. The errors I 
was getting from pandoc.read were because the input wasn't good LaTeX.

```
local caption = string.match(el.text, "\\caption{(.+)}\n")
        if caption then
            local alt_text = pandoc.utils.stringify(pandoc.read(caption, 
'latex').blocks)
            return pandoc.Plain({pandoc.Image({pandoc.Str(alt_text)}, 
fname)})
```

On Monday, 26 October 2020 at 11:28:24 UTC+1 Thomas Hodgson wrote:

> I have been learning how to write filters with Lua. I started with the 
> tikz.lua example, and changed it to search for any figure. I want to put 
> captions in the alt text of the images. So, I added this:
>
> ```
> local caption = string.match(el.text, "\\caption{(.-)}")
>         if caption then
>             return pandoc.Plain({pandoc.Image({pandoc.Str(caption)}, 
> fname)})
> ```
>
> That works, but it turns the raw LaTeX into a string, and my regex only 
> goes as far as the last bracket; this is a regex issue.. So, I get things 
> like this as alt text:
>
> `foo' \emph{bar
>
> Is there a way to have the filter turn that LaTeX into Pandoc's native 
> format? I tried to think about pandoc.read, but didn't get very far.
>
> Thanks.
>
> Tom
>

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