Add support for LaTeX rendering using KaTex rendering engine

[kutenai]

Do you want to request a feature or report a bug?
Request a feature

What is the current behavior?
No support for LaTeX type markup, as implemented by
https://github.com/Khan/KaTeX

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. GIFs and screenshots are very helpful too.
There is just no support as I understand it.

What is the expected behavior?
Add the ability to (optionally) include KaTex support, so that character sequences like this:
$f(x) = \int_{-\infty}^\infty
\hat f(\xi),e^{2 \pi i \xi x}
,d\xi$

would be rendered as math.

Which versions of Draftail + Draft.js, and which browser / OS are affected by this issue? Did this work in previous versions of Draftail or Draft.js?
This is a future feature request.

[kutenai]

I did find that there is a KaTex Plugin for Draft.js..
https://www.npmjs.com/package/draft-js-katex-plugin

This would presumably help get things started.

[thibaudcolas]

Hey @kutenai, thank you for taking the time to file this.

Draftail only provides built-in support for very basic formatting (headings, lists, bold, italic and so on – see the full list in the docs). I think keeping this list as short as possible is good, and including KaTeX support would go against that. Generally, if a rich text format can map directly to a given HTML element without any further attributes, CSS or JS, it's a good fit to be built-in. Otherwise it's too complex.

Luckily it should be possible to implement KaTeX support as a third-party plugin, with the custom entities APIs.