My Hammerspoon config file

init.lua

hs.hotkey.bind({"cmd", "alt", "ctrl"}, "R", function()
  hs.reload()
end)
hs.alert.show("Config loaded")

hs.loadSpoon("ShiftIt")
spoon.ShiftIt:bindHotkeys({})

spoon.ShiftIt:bindHotkeys({
  left = {{ 'alt', 'cmd' }, 'z' },
  right = {{ 'alt', 'cmd' }, 'x' },
  up = {{ 'alt', 'cmd' }, 'q' },
  down = {{ 'alt', 'cmd' }, 'a' },
  resizeIn = {{ 'alt', 'cmd' }, '-' },
  resizeOut = {{ 'alt', 'cmd' }, '=' },
  toggleZoom = {{ 'alt', 'cmd' }, 'f' },
  upleft = {{ 'alt', 'cmd' }, '1' },
  upright = {{ 'alt', 'cmd' }, '2' },
  botleft = {{ 'alt', 'cmd' }, '3' },
  botright = {{ 'alt', 'cmd' }, '4' }
})


hs.hotkey.bind({"cmd", "alt"}, "s", function()
  -- size focused window to middle third of display
  local win = hs.window.focusedWindow()
  local f = win:frame()
  local screen = win:screen()
  local max = screen:frame()

  f.x = max.x + (max.w / 3)
  f.y = max.y
  f.w = max.w / 3
  f.h = max.h
  win:setFrame(f)
end)

-- move window to next screen
-- bind hotkey
hs.hotkey.bind({'alt', 'ctrl', 'cmd'}, ']', function()
  -- get the focused window
  local win = hs.window.focusedWindow()
  -- get the screen where the focused window is displayed, a.k.a. current screen
  local screen = win:screen()
  -- compute the unitRect of the focused window relative to the current screen
  -- and move the window to the next screen setting the same unitRect 
  win:move(win:frame():toUnitRect(screen:frame()), screen:next(), true, 0)
end)

-- move window to previous screen
-- bind hotkey
hs.hotkey.bind({'alt', 'ctrl', 'cmd'}, '[', function()
  -- get the focused window
  local win = hs.window.focusedWindow()
  -- get the screen where the focused window is displayed, a.k.a. current screen
  local screen = win:screen()
  -- compute the unitRect of the focused window relative to the current screen
  -- and move the window to the previous screen setting the same unitRect 
  win:move(win:frame():toUnitRect(screen:frame()), screen:previous(), true, 0)
end)