math: allow to work with Hugo's passthrough configuration

[Kevinanny]

When I was using a '\' to break line in array environment using mathjax, it can't break line properly. The reason is the last \ was escaping. As i know, hugo didn't support escaping configuration for now. Some people say Katex can solve this issue. Some say that is bug from the render. But i know less to figure it out. I guess the author may could solve this from the theme side. By the way, would this theme will consider support Katex in the future?

[McShelby]

I am not a MathJax nerd either. Please provide your formula in source code and expected output (as gif).

The theme will not support Katex. One math library is enough but you could write a katex shortcode yourself.

[Kevinanny]

Thank you for the reply very much! Here is my issue.

To keep consistence between markdown and latex, my mathjax configure is :

<script>
  MathJax = {
    tex: {
      packages: ['base', 'ams'],        // extensions to use
      inlineMath: [['$','$'], ['\\(','\\)']], // allow using $ $ to input inline equation
      displayMath: [['$$','$$'], ['\[','\]']], //allow using $$ $$ to display equation
      processEscapes: true,      // use \$ to produce a literal dollar sign
    }
  };
  </script>

<script type="text/javascript" id="MathJax-script" async
  src="https://cdn.jsdelivr.net/npm/mathjax@3.2.2/es5/tex-svg.js">
</script>

I didn't use codefence to input formula, because it display formular as source code in markdown. It's unintuitive. I use $$ $$ to input formula, which is supported both in markdown and latex.

My formula source code is below:

$$\left|
\begin{array}{cc}
a & b \\
c & d
\end{array}\right|$$

The display should be:

While it seems there is a '\' escaping, that means '\\' won't break line, so the actual display is

Some people implied that '\\\\' could breakline, it did work. However, it will break the consistence between markdown and latex. Change formula one by one is very annoyed.

[McShelby]

Thanks for providing. I'll take a look into it.

[McShelby]

With this fix, your example should work without a shortcode or codefence if adhering to the passthrough configuration.

I've reused your example on the above linked docs page.