[iLemming]

Ah, that's on Mac, but I forgot to tell you about the Linux. On Linux, I ran my modal-keyboard-toolkit controlled through babashka (clojure) with an exposed nREPL endpoint. That means I can query and control windows - their placement, change brightness and color temp. - all interactively, directly from my editor. I can write some conditional event loop, e.g., time-based color temp changes. Because I have a Lisp REPL - I can test out all the colors, squeezing the entire day into a minute - simulate, eval and preview the results - no saving, no reloading, no recompilation. Once satisfied - I can put the time markers accordingly - so colors change depending on the time of day.