On top of having 2 Macs, I sometimes change screen resolutions — so I’m hoping for a shared, resolution-independent way to size and position windows (Finder mostly, but any app, really). I use (and love) BetterSnapTool, but it doesn’t have a setting for what I want: ¼ display width, full-height.
My thinking is: I need to get the display’s current resolution, divide its width by 4, then set the current window width and top-left position accordingly.
I’m stumbling on a) everything related to screen size seems to be about SETTING it — not GETTING it and b) not being able to figure out parsing tokens like ScreenResolutions that return a set of comma-delimited values.
Unless I'm missunderstanding what you are after, Keyboard Maestro can size windows proportionally to whatever screen the Macro is run on directly without any further steps: