Hammerspoon ShiftIt replacement (50% window tiling, maximize, change display)

gistfile1.lua

-- https://www.hammerspoon.org/go/#window-sizing
-- https://stackoverflow.com/questions/54151343/how-to-move-an-application-between-monitors-in-hammerspoon
-- https://github.com/fikovnik/ShiftIt/issues/296#issuecomment-438386501
hs.hotkey.bind({"cmd", "alt", "ctrl"}, "r", function()
  hs.reload()
end)
hs.alert.show("Config loaded")

hs.window.animationDuration = 0
units = {
  right50       = { x = 0.50, y = 0.00, w = 0.50, h = 1.00 },
  left50        = { x = 0.00, y = 0.00, w = 0.50, h = 1.00 },
  top50         = { x = 0.00, y = 0.00, w = 1.00, h = 0.50 },
  bot50         = { x = 0.00, y = 0.50, w = 1.00, h = 0.50 },
  maximum       = { x = 0.00, y = 0.00, w = 1.00, h = 1.00 }
}

mash = { 'alt', 'ctrl', 'cmd' }
hs.hotkey.bind(mash, 'left', function() hs.window.focusedWindow():move(units.left50,    nil, true) end)
hs.hotkey.bind(mash, 'right', function() hs.window.focusedWindow():move(units.right50,     nil, true) end)
hs.hotkey.bind(mash, 'h', function() hs.window.focusedWindow():move(units.left50,    nil, true) end)
hs.hotkey.bind(mash, 'l', function() hs.window.focusedWindow():move(units.right50,     nil, true) end)
hs.hotkey.bind(mash, 'up', function() hs.window.focusedWindow():move(units.top50,      nil, true) end)
hs.hotkey.bind(mash, 'down', function() hs.window.focusedWindow():move(units.bot50,      nil, true) end)
hs.hotkey.bind(mash, 'k', function() hs.window.focusedWindow():move(units.top50,      nil, true) end)
hs.hotkey.bind(mash, 'j', function() hs.window.focusedWindow():move(units.bot50,      nil, true) end)
hs.hotkey.bind(mash, 'm', function() hs.window.focusedWindow():move(units.maximum,    nil, true) end)
hs.hotkey.bind(mash, 'n', function()
  local focusedWindow = hs.window.focusedWindow()
  local focusedScreenFrame = focusedWindow:screen():frame()
  local nextScreenFrame = focusedWindow:screen():next():frame()
  local windowFrame = focusedWindow:frame()

  windowFrame.x = ((((windowFrame.x - focusedScreenFrame.x) / focusedScreenFrame.w) * nextScreenFrame.w) + nextScreenFrame.x)
  windowFrame.y = ((((windowFrame.y - focusedScreenFrame.y) / focusedScreenFrame.h) * nextScreenFrame.h) + nextScreenFrame.y)
  windowFrame.h = ((windowFrame.h / focusedScreenFrame.h) * nextScreenFrame.h)
  windowFrame.w = ((windowFrame.w / focusedScreenFrame.w) * nextScreenFrame.w)

  focusedWindow:setFrame(windowFrame)
end)