Ask HN: What code editors or IDEs are easily scriptable?

Of the “preferred not” languages you listed, Lisp and Lisp-derivatives are easily the most pragmatic languages you will see doing “real” work outside of the scripting environment. So, given the dearth of good scriptable editors using other languages, why not give Emacs a try? I will grant that Elisp is a bit of an odd dialect, but a lot of what you learn from learning Elisp will transfer to understanding other languages better, modulo function names and whatnot. It’s also helpful that Elisp has comprehensive documentation available right from the editor itself. There are also hundreds of high-quality examples you can look at too, and Elisp lets to poke at basically every aspect of the editor.

Zed is written in Rust: https://github.com/zed-industries/zed. It seems relatively straightforward to write an extension for it, but I've never personally tried (I suck at Rust).

I will say that Lua is extremely easy to pick up, and as far as hacking on an IDE I think that simplicity might make it an ideal language.

VSCode has a comprehensive API that you can create scripts for in Typescript

Also Ruby.

IMO, the language is only a small part of a deeper relationship with your IDE. The IDE needs a good debugger, a good introspection system, and good hooks to modify things (ideally anything). Emacs meets this criteria, but few others do. This is why there is a living corpus of 40+ year old elisp that can be drawn upon for functionality and inspiration.