Typst: Improve syntax highlighting support

[cwickham]

Bring typst support up to the level of PDF as described in PDF Basics.

In particular, add support for the highlight-style option.

This one might be out of our scope, since from what I can tell, the syntax highlighting we currently get is via Typst directly not Pandoc.

Perhaps we could provide an option to specify the style Typst uses via the theme argument to raw().

[cscheid]

I agree, I think this one will be pretty hard to do in general (and specifically I'm not looking to do it for 1.4)

[cwickham]

And I guess if someone really wants different syntax highlighting, it's easy enough to set through Typst with a raw block:

```{=typst} 
#set raw(theme: "Adventure_Time.tmTheme.txt")
```

[cscheid]

This one might be out of our scope, since from what I can tell, the syntax highlighting we currently get is via Typst directly not Pandoc.

This is the main complication indeed.

Perhaps we could provide an option to specify the style Typst uses via the theme argument to raw().

Yes, that's one way of doing it, but the real problem is that we have two incompatible notions of syntax highlighting.

I don't want to do this for 1.5, but I wonder if the solution for 1.6 is to add support for native syntax highlighting of text in Pandoc's Typst writer directly.

[cderv]

I think this is something we should work on with Pandoc team, to add support for Pandoc's highlighter for Typst output format
This is the library that powers it https://github.com/jgm/skylighting and which is used by pandoc
It needs to gain a format to typst feature.

[mcanouil]

FYI:

• Highlighting for typst jgm/skylighting#184

[cderv]

Thanks @mcanouil - I have seen this one obviously, and this not the same. I haven't linked to it because this is about highlighting style for code block of language typst

```typst
<raw typst here>
```

so that this is highlighted correctly in format where Pandoc's syntax highlighter applies. It is about XML language highlighting support.

Here were are talking about syntax highlighter - The fact that Pandoc does the highlighting for the Typst format, which would allow for highlighting-style to then be applied.

As mentioned originally, currently we get code block highlighting by Typst directly.

So we could either:

• Improve our configuration for native Typst highlighting, and this would mean different them than current highlight-style option
• Add support in Pandoc for its syntax highlighter knowing how to write typst output and adapt the highlighting style and xml language file (like it is done for HTML or PDF)

Hope it clarifies.

[mcanouil]

oh, I misunderstood.

• this issue is highlighting (any) code in Typst document (using Pandoc/Skylighting).
• the issue in "skylighting" is highlighting Typst code (anywhere)