Feature request: support MyST directives and roles

[tarleb]

MyST (Markedly Structured Text) is a reStructuredText-inspired superset of CommonMark. It comes with two major additions: directives and roles:

• Directives are code blocks with a special attribute syntax:

  ``` {directiveName} arg1 arg2
  Contents
  ```

• Roles are similar to the attributes extension, but come before the inline code:

  {role}`text`

MyST is supported by the Jupyter Book project.

[jgm]

Would supporting directives and roles fully support MyST, or is there more to it?

What would the semantics of these be?

[tarleb]

I believe it would be enough to get basic support, but I'm still learning about MyST and can't answer with confidence. It seems that the contents of those constructs is treated as CommonMark. If these were to be read as code, then a pandoc filter might be enough to add full support.

I'll have to do some experimenting and/or sources reading.