The (under-recognized, imho) iOS text editor 1Writer has a great collection of JavaScripts for text manipulation etc., which can be adapted for use in Drafts with a few slight changes:
http://1writerapp.com/actiondir
Figured folks might be interested in this resource. It’s a lot less work than translating Python to JavaScript which is what I had been doing with a lot of my Editorial scripts.
The main difference I’ve found is in the Drafts prompt object vs. the ui object in 1Writer