Yeah I think the exact same way! The top of the physical wheel spins the opposite direction of the bottom of the wheel which would be "touching" the page/content. Originally I was going to just make a background script to automatically toggle the option when it detects certain USB devices (like my mouse) but I couldn't find a way to apply settings changed via the "defaults write" command without logging out and then back in. In my research I came across discrete-scroll and scroll reverser on GitHub. Discrete-scroll worked in Catalina but had no GUI, and Scroll Reverser didn't work reliably on Catalina. So I combined the ideas from both in as little Swift code as possible so that anyone using my app wouldn't need to worry about allowing the app to "control your computer".
I have to say I really appreciate this! I was going down very similar lines just last week (I had installed Hammerspoon and was experimenting with some applescript hacks, but to no avail).
Just intercepting the actual scroll and inverting it is a really elegant solution (that doesn't require a relog) which is great.
This solves one of the two biggest gripes I had about MacOs - with the other being my inablility to "pin" my dock to one of my monitors, overriding the swap functionality. Thanks!
