window.lua

-- window management

-- define window movement/resize operation mappings
local arrowMap = {
  Up = { half = { 0, 0, 1,.5}, movement = { 0,-20}, complement = "Left", resize = "Shorter" },
  Down = { half = { 0,.5, 1,.5}, movement = { 0, 20}, complement = "Right", resize = "Taller" },
  Left = { half = { 0, 0,.5, 1}, movement = {-20, 0}, complement = "Down", resize = "Thinner" },
  Right = { half = {.5, 0,.5, 1}, movement = { 20, 0}, complement = "Up", resize = "Wider" },
}

-- compose screen quadrants from halves
local function quadrant(t1, t2)
  return {t1[1] + t2[1], t1[2] + t2[2], .5, .5}
end

-- move and/or resize windows
local function rect(rect)
  return function()
    undo:push()
    local win = fw()
    if win then win:move(rect) end
  end
end

-- center and enlarge current window; hold to maximize
bind(hyper, "space", rect({1/8, 1/8, 3/4, 3/4}), nil, rect({0, 0, 1, 1}))

-- arrow-based window movement/resize operations
hs.fnutils.each({"Left", "Right", "Up", "Down"}, function(arrow)

    bind(hyper, arrow, -- set to screen halves; hold for quadrants
      rect(arrowMap[arrow].half),
      nil,
      rect(quadrant(arrowMap[arrow].half, arrowMap[arrowMap[arrow].complement].half))
    )

    bind({"ctrl", "cmd"}, arrow, -- move windows incrementally
      rect(arrowMap[arrow].movement),
      nil,
      rect(arrowMap[arrow].movement)
    )

    bind({"ctrl", "alt"}, arrow, -- move windows by grid increments
      function() undo:push(); hs.grid['pushWindow'..arrow](fw()) end
    )

    bind({"ctrl", "alt", "shift"}, arrow, -- resize windows by grid increments
      function() undo:push(); hs.grid['resizeWindow'..arrowMap[arrow].resize](fw()) end
    )

  end)

-- window grid configuration
hs.grid.setGrid("6x4")
hs.grid.setMargins({0, 0})
bind(hyper, '/', function()
    local gridSize = hs.grid.getGrid()
    hs.grid.setGrid("3x3")
    hs.grid.show(function() hs.grid.setGrid(gridSize) end)
  end)

-- undo for window operations
undo = {}

function undo:push()
  local win = fw()
  if win and not undo[win:id()] then
    self[win:id()] = win:frame()
  end
end

function undo:pop()
  local win = fw()
  if win and self[win:id()] then
    win:setFrame(self[win:id()])
    self[win:id()] = nil
  end
end

bind({"ctrl", "alt"}, "z", function() undo:pop() end)