Add support for GitLab Flavored Markdown

[simonspa]

I'm trying to configure KaTeX delimiters in order to parse and interpret the (admittedly odd) GitLab Markdown style using fenced code blocks of type math for formulae:

https://docs.gitlab.com/ee/user/markdown.html#math

I have added the definition to my config.toml but it doesn't seem to do anything - maybe because code highlighting is performed before KaTeX parsing?

[[params.katex.options.delimiters]]
left = "```math"
right = "```"
display = true

Do you have an idea how I could make the two compatible?

[LisaFC]

@deining, any ideas?

[deining]

Having a look at the documentation of the autorender extension, the ignoredTags option looks interesting to me: The default value of this option is ["script", "noscript", "style", "textarea", "pre", "code", "option"]. Since your code block is wrapped inside <pre> and <code> tags, the content of your code block might be ignored by the autorender extension. Just an idea, I haven't tested this. Maybe this can bring you on the right track here.

[simonspa]

Thanks @deining for the suggestion! I have tried this but unfortunately to no avail. After configuring KaTeX with

[params.katex.options]
ignoredTags = ["script", "noscript", "style", "textarea", "option"]

[[params.katex.options.delimiters]]
left = "```math"
right = "```"
display = true

my HTML still has the bare code:

<pre><code class="language-math" data-lang="math">\chi (x) = e^{-t/\tau}</code></pre>

I've also tried to find other solutions that use KaTeX with GitLab-flavored markdown but the only project I have found is this Python wrapper for KaTeX:

https://github.com/mbarkhau/markdown-katex

As far as I can see and understand the code, they parse the MD independently and only pass the stripped content to the KaTeX renderer. Do you have any other idea? (It's really unfortunate GitLab had to go their individual path there instead of sticking to what everyone else uses...)

[deining]

With #987, support for GLFM math blocks was added.
Therefore this ticket can be closed.