@amszmidt @pancake @korreckj328 Yeah, you can also “trivially” do something similar in Forth with SOURCE and >IN, here’s quite a fitting example: https://forth-standard.org/standard/core/PARSE-NAME
You should understand that these are quite low-level mechanisms. What I’m imagining would need some sufficient “framework” or “infrastructure”, which would make it as easy as installing and tweaking editor themes or plugins. I wonder if there are people who are interested in making this possible; if so, who they are and how much progress was made.