colon fence syntax is broken by escape character

[arwedus]

Describe the problem

In case of a colon fence:

:::{NOTE}

README.md should contain the component or package name in it's title.
Using only README as title will lead to lots of "README" items in the outline of the generated documentation.
:::

mdformat produces:

:::\{NOTE}

README.md should contain the component or package name in it's title.
Using only README as title will lead to lots of "README" items in the outline of the generated documentation.
:::

Ideally, mdformat with mdformat_myst would respect this syntax and not escape it.

To me, it is not even clear why mdformat escapes curly brackets in the first place.

Link to your repository or website

No response

Steps to reproduce

1. "pip install mdformat_myst"
2. Put the above example in a .md file
3. run "mdformat filename.md"

The version of Python you're using

3.8

Your operating system

Ubuntu 20.04

Versions of your packages

mdformat==0.7.10
mdformat_frontmatter==0.4.1
mdformat_myst==0.1.4
mdformat_tables==0.4.1

Additional context

No response

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[hukkin]

The plugin only supports syntax extensions that are on by default in MyST. Colon fence is not a supported syntax currently.

[adamgayoso]

Will this be supported in the future?

[verm]

The formater seems to have gotten more aggressive in its escaping. The default suggestion for https://github.com/executablebooks/rst-to-myst is to enable colon fences. Then using mdformat it proceeds to escape everything.

We're already using mdformat for our other documents but now converting our Sphinx+reST documents over the formatter will no longer work. Are there any plans to add support?

Thank you!