Allow adding unified plugins to AST processing?

[gitonthescene]

Hey there,

Thanks again for an awesome project.

Do you think it might be a good idea to allow overriding the AST parsers/transformers for configurability? If someone wanted to touch up the produced HTML they could simply add a transformer plugin to edit the resulting tree. I'm thinking something like this change.

I don't have strong opinions for how to configure use of plugins (where they should be placed, how they are fetched, etc.). I don't have a need for this, so this is more food for thought than anything else. Browsing through the other issues, I wonder if something like this might put the power in the end user's hands. The obvious downside is the potential for incompatibility.

Please let me know what you think.

Regards,
-Doug

[xiaoxinghu]

This is a good idea. The unifiedjs is so powerful because of the composable plugin system. We should take advantage of it. luckily we have plenty of examples to learn from (remark-toc, remark-react). We should create orga-toc for starters to take it for a spin. Will create a separate issue with more details in it.