How to add a new option?

[timaschew]

I've tried to introduce a new option transcludeAutowhich is similar to the transcludeWith but it didn't work. The pattern was found and also the _content was filled up with all the lines. But at the end in the browser it showed up: No lines matched.. It was very weird because it even didn't log this line (No lines matched) to the terminal (this logic I've added as well).

So I ended up replacing the logic with the existing transcludeWIth. This way it was working as expected. Also the No lines matched was printed to the terminal. It feels like vuepress was using some cached functions of plugins. But I did restart the process, do they realy can cache it across processes?

Here is the code: https://github.com/timaschew/markdown-it-vuepress-code-snippet-enhanced/blob/6cab329cbc570010486e53687f9ae1c081ddcbef/src/plugin.js#L116-L133