8cc.vim is a C compiler that exists as pure Vimscript. Is it small? It sure is! How about fast? Absolutely not! Efficient? Also no. But does it work and is it neat? You betcha! Vimscript itself was ...
turn the trimmer counterclockwise until you find the position between D1 blinking and still on turn the trimmer clockwise until you find the position between D1 blinking and still off count the turns ...