Rudimentary Math Support

[2piix]

This is purely a feature request/request for some quick help. I'm trying to add rudimentary support for MathJax, and I've done most of the work, but I'm having a little bit of trouble with my debugging.

The support, as I envision it, simply passes the contents of $foo$ and

$$
foo
$$

through, without change. This way, the onus to import the mathjax libraries (or any other library) is on the user -- presumably by embedding the Cheapskate's Html in their product. However, I am having some problems getting the $$ parsers to work. I defined a new Container called 'DisplayMath'. I am unable to "close" the DisplayMath container. The closest I have gotten is with this case in continueContainer:

DisplayMath -> nfb $ string "\n$$"

This results in:

  DisplayMath
    BlankLine ""
    "\\sin \\pi = 0"
  DisplayMath
    BlankLine ""
    BlankLine ""
    "The quick brown $\\pi$ jumps over the lazy dog."
    BlankLine "",fromList [])

on the input

$$
\sin \pi = 0
$$

The quick brown $\pi$ jumps over the lazy dog.

Which makes it look like the second $$ is closing the environment but is not getting consumed, so it is triggering a new DisplayMath container. What is the proper place to consume the $$'s?

Sorry, I hope this request for help isn't too tangential to your goals. I really would like to make some nice, high quality code for your library.

[jgm]

Hint: your construct is like a fenced code block (opening
line delimiter, contents, closing line delimiter). So you
should be able to mimic the treatment of FencedCode.

[2piix]

Thanks for the hint. It's working great now.

I'm not sure if you're interested in my code, but if you are, I've committed a working version. One thing I did that might be off-putting is treat the math displays with an alternative version of parseInlines -- I'm calling it processMathLines (obviously, I'd be happy to do some clean up to fit your tree if you're interested). The point is that I do want the math environments to be richer than just plain Text, but I don't want the full power of Markdown in them. I plan on adding "Hide" (for "spoiler" tags) Inlines and Blocks next. Unless you're interested in that stuff too, I will be maintaining my own fork, either way.

https://github.com/2piix/cheapskate