diff --git a/hammerspoon/init.lua b/hammerspoon/init.lua
index 1098fbb..deeabc0 100644
--- a/hammerspoon/init.lua
+++ b/hammerspoon/init.lua
@@ -1,7 +1,167 @@
-hs.hotkey.bind({"cmd", "alt", "ctrl"}, "H", function()
-  local win = hs.window.focusedWindow()
-  local f = win:frame()
+--
+-- configuration
+--
 
-  f.x = f.x - 10
-  win:setFrame(f)
-end)
\ No newline at end of file
+local animationDuration = 0.0
+local gridSizes = { default = '30x20', interactive = '8x4' }
+local gridTextSize = 100
+local margins = { w = 4, h = 4 }
+
+
+--
+-- setup
+--
+
+local grid = require('ext.grid')
+
+hs.window.animationDuration=animationDuration
+grid.setGrid(gridSizes.default)
+grid.setMargins(margins)
+grid.ui.textSize = gridTextSize
+
+
+--
+-- helpers
+--
+
+function adjustGridWindow(x, y, w, h)
+  return function()
+    grid.adjustWindow(
+      function(cell)
+        cell.x,cell.y,cell.w,cell.h = x, y, w, h
+      end
+    )
+  end
+end
+
+
+--
+-- resize to grid
+--
+
+-- show interactive grid menu
+hs.hotkey.bind(
+  {"cmd", "ctrl"}, "4",
+  function()
+    grid.setGrid(gridSizes.interactive)
+    grid.toggleShow(
+      function()
+        grid.setGrid(gridSizes.default)
+      end
+    )
+  end
+)
+
+-- left half
+hs.hotkey.bind({"cmd", "ctrl"}, "J", adjustGridWindow(0, 0, 15, 20))
+-- right half
+hs.hotkey.bind({"cmd", "ctrl"}, "L", adjustGridWindow(15, 0, 15, 20))
+-- top half
+hs.hotkey.bind({"cmd", "ctrl"}, "I", adjustGridWindow(0, 0, 30, 10))
+-- bottom half
+hs.hotkey.bind({"cmd", "ctrl"}, "K", adjustGridWindow(0, 10, 30, 10))
+
+-- left narrow
+hs.hotkey.bind({"ctrl", "alt"}, "U", adjustGridWindow(0, 0, 12, 20))
+-- right narrow
+hs.hotkey.bind({"ctrl", "alt"}, "O", adjustGridWindow(18, 0, 12, 20))
+
+-- left wide
+hs.hotkey.bind({"cmd", "ctrl"}, "U", adjustGridWindow(0, 0, 18, 20))
+-- right wide
+hs.hotkey.bind({"cmd", "ctrl"}, "O", adjustGridWindow(12, 0, 18, 20))
+
+-- left fat
+hs.hotkey.bind({"ctrl", "alt"}, "J", adjustGridWindow(0, 0, 21, 20))
+-- right wide
+hs.hotkey.bind({"ctrl", "alt"}, "L", adjustGridWindow(9, 0, 21, 20))
+-- top fat
+hs.hotkey.bind({"ctrl", "alt"}, "I", adjustGridWindow(0, 0, 30, 14))
+-- bottom wide
+hs.hotkey.bind({"ctrl", "alt"}, "K", adjustGridWindow(0, 6, 30, 14))
+
+-- top left quarter
+hs.hotkey.bind({"cmd", "ctrl", "shift"}, "J", adjustGridWindow(0, 0, 15, 10))
+-- top right quarter
+hs.hotkey.bind({"cmd", "ctrl", "shift"}, "I", adjustGridWindow(15, 0, 15, 10))
+-- bottom right quarter
+hs.hotkey.bind({"cmd", "ctrl", "shift"}, "L", adjustGridWindow(15, 10, 15, 10))
+-- bottom left quarter
+hs.hotkey.bind({"cmd", "ctrl", "shift"}, "K", adjustGridWindow(0, 10, 15, 10))
+
+-- center narrow small
+hs.hotkey.bind({"ctrl", "alt"}, "\\", adjustGridWindow(9, 0, 12, 20))
+-- center narrow
+hs.hotkey.bind({"cmd", "ctrl"}, "\\", adjustGridWindow(7, 0, 16, 20))
+
+-- center medium small
+hs.hotkey.bind({"ctrl", "alt"}, "'", adjustGridWindow(6, 0, 18, 20))
+-- center medium
+hs.hotkey.bind({"cmd", "ctrl"}, "'", adjustGridWindow(5, 0, 20, 20))
+
+-- center wide small
+hs.hotkey.bind({"ctrl", "alt"}, ";", adjustGridWindow(4, 0, 22, 20))
+-- center wide
+hs.hotkey.bind({"cmd", "ctrl"}, ";", adjustGridWindow(3, 0, 24, 20))
+
+-- center wide
+hs.hotkey.bind({"cmd", "ctrl"}, "H", function() grid.maximizeWindow() end)
+
+
+--
+-- move between displays
+--
+
+-- move to screen to the left
+hs.hotkey.bind(
+  {"cmd", "ctrl"}, ",",
+  function()
+    local win = hs.window.focusedWindow()
+    win:moveOneScreenWest()
+    grid.snap(win)
+  end
+)
+
+-- move to screen to the right
+hs.hotkey.bind(
+  {"cmd", "ctrl"}, ".",
+  function()
+    local win = hs.window.focusedWindow()
+    win:moveOneScreenEast()
+    grid.snap(win)
+  end
+)
+
+-- move to screen above
+hs.hotkey.bind(
+  {"cmd", "ctrl"}, "P",
+  function()
+    local win = hs.window.focusedWindow()
+    win:moveOneScreenNorth()
+    grid.snap(win)
+  end
+)
+
+-- move to screen bellow
+hs.hotkey.bind(
+  {"cmd", "ctrl"}, "N",
+  function()
+    local win = hs.window.focusedWindow()
+    win:moveOneScreenSouth()
+    grid.snap(win)
+  end
+)
+
+
+--
+-- the end
+--
+
+-- reload config
+hs.hotkey.bind(
+  {"cmd", "alt", "ctrl"}, "R",
+  function()
+    hs.reload()
+  end
+)
+hs.alert.show("Hammerspoon loaded")