executablebooks
Better rendering of unknown directives
Currently, an undefined directive such as:
:::{foo} A title
Lorem ipsum etc ...
:::
is rendered as such:
It's indeed important to warn the user about such an unknown directive which may result from a typo. Yet on many occasions the user needs to edit notebooks which legitimately include such unknown directives. Typically because this is a custom directive defined in a Jupyter-Book or MySTmd extension that is not yet supported in JupyterLab-Myst. This includes fairly standard directives such as todo, etc.
In that case the current rendering is very obtrusive, requiring user interaction to see the actual content.
Proposal
Render the directive as a standard admonition (including the support for classes etc.), with just
(foo: undefined directive) added at the end of the title in warning style. Typically:
