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Without knowing too much about either editor, how does this compare / differ with Yi (http://yi-editor.github.io/)?

Looks like they're using parts of Yi. They seem to have switched to using the rope data type from Yi for the representation of text:

commit: "Add BufRefs and switch to YiString for all internal representations" (23 hours ago)

https://github.com/ChrisPenner/rasa/commit/bb95a3263fc40120e...

I think I remember the author posting on /r/haskell a bit back about this project. He mentioned that in his editor even the core editor functionality are implemented as extensions (contrary to Yi), so the extension API is quite robust.

> Rasa is putting extensions first from the very beginning, I've read that Yi has plans to extract their renderers into extensions but hasn't been able to easily extract them at this point. In rasa, EVERYTHING is an extension (for better or worse I suppose we'll see).

https://www.reddit.com/r/haskell/comments/5l0a2i/rasa_modula...

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