Add support for serializing math nodes as markdown

[bnchi]

Adds support for serializing math nodes in mdast_util_to_markdown

TODO :

• Add support for inline math and complete the tests

[bnchi]

@wooorm I made this a draft to get your opinion on how we're going to be serializing the extensions should we do any special way in the API by allowing the user to configure the extension or no. This draft doesn't allow the user to configure the extension and we serialize the extensions nodes in a "normal" way.

[wooorm]

should we do any special way in the API by allowing the user to configure the extension or no

No, I don’t think so. I think it’s good to always serialize nodes, if we understand them!

[wooorm]

Looks good, just a small nit on docs :)

Otherwise, I think it’s good? You? Anything in particular you wanted me to look at?

[bnchi]

Otherwise, I think it’s good? You? Anything in particular you wanted me to look at?

No, all good.

I'll probably work on the mdx nodes next. Thank you :)

[wooorm]

Super, thank you! 👏

[SamPeng87]

so,I think that to_markdown api has need some time to used?thanks that pr，I need that feature too

[bnchi]

@SamPeng87 It's usable but it needs some documentations and most likely a release into the registry, for now you can add the following to your Cargo.toml and use it :

[dependencies]
mdast_util_to_markdown = { git = "https://github.com/wooorm/markdown-rs.git" }

The api is pretty simple just have a look at the exposed functions here : https://github.com/wooorm/markdown-rs/blob/main/mdast_util_to_markdown/src/lib.rs

[SamPeng87]

@bnchi yes,thanks，I found that there was no document to tell me how to use it, but I found that there was in master branch, so I just studied the latest master of github master branch instead of crate.io。that work。thanks you。