Add text content renderer

[JinneeJ]

Finally added ability to get clean text.

P.S.: Really sorry for big delay 🙏

[robinst]

This should probably use orderedList.getStartNumber() instead of 1, right?

[JinneeJ]

You're right :) Fixed here 32771fa

[robinst]

Nice change!

Do you have any plans for making it work for custom nodes for extensions (e.g. Strikethrough)? Maybe we should have a similar model as for HTML rendering where extensions can contribute code for rendering, and users can customize the rendering for specific node types. See NodeRenderer and friends.

(By the way, I was on holidays, that's why it took so long to respond.)

[JinneeJ]

Thanks for review! I've made the fix with lists.

Also I've tried to implement support extensions for TextContentRenderer. But I had to make some changes in core in order to avoid copying of code. You can see it in last 5 commits. Let me know what you think about those changes 😊

[robinst]

Cool, starting to look good!

I wanted to make a few suggestions but wasn't sure how they'd work, so I checked out the branch and started modifying it :). I merged master into your branch and did these changes on top:

1. 43c7e28
2. 91827e2

Can you have a look and tell me if it makes sense?

[JinneeJ]

I think your changes are great 😊

[robinst]

Thanks! Merged now. Will do a release soon with these and other changes.

[robinst]

Released now, thanks a lot @JinneeJ: https://github.com/atlassian/commonmark-java/releases/tag/commonmark-parent-0.7.0