Option --match not-fenced

[asimjalis]

It would be nice to have a "--match indented". In other words, the opposite of "--match fenced".

Benefits are:

1. Easy to indicate syntax of non-executable code (using fencing) so IPYN syntax highlighting can work.
2. Easy to distinguish executable vs non-executable code.

[aaren]

So notedown --match indented would only execute indented code and would leave fenced code as-is in a markdown cell?

[aaren]

You can already do notedown --match strict, which requires executed code to have .input in the classes, e.g.

not executed

```{.input}
executed

not executed

executed

[aaren]

Not going to add this unless there is more demand and the current solution (--match strict) is insufficient.