Hammerspoon Lua Script – Split Windows 3×3

I’ve been using using Spectacle pretty heavily, but with a larger screen, I always felt like quadrants were a poor use of real estate, so I began to crack open the source code, which was pretty challenging to navigate because it’s a mix of JavaScript and Objective-C reminiscent of user interface programming from ages past. So, I turned next to Hammerspoon.

Hammerspoon uses Lua as a programming interface. I was able to automate moving windows around a 3×3 grid on the current screen with 18 lines of code.

function move_to_third(r,c)
local win = hs.window.focusedWindow()
local f = win:frame()
local screen = win:screen()
local extents = screen:frame()
f.x = extents.x + (extents.w / 3) * c
f.y = extents.y + (extents.h / 3) * r
f.w = extents.w / 3
f.h = extents.h / 3
for i=1,9 do
hs.hotkey.bind({"cmd", "alt", "ctrl"}, tostring(i), function()

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