My hammerspoon configuration

init.lua

-- Auto-reload config
function reloadConfig(files)
    doReload = false
    for _,file in pairs(files) do
        if file:sub(-4) == ".lua" then
            doReload = true
        end
    end
    if doReload then
        hs.reload()
    end
end
hs.pathwatcher.new(os.getenv("HOME") .. "/.hammerspoon/", reloadConfig):start()

--
-- Key defs
--

local cah = {"cmd", "alt", "ctrl"}
local cahs = {"cmd", "alt", "ctrl", "shift"}

--
-- Window manipulation
--

-- Window hints
hs.hotkey.bind(cah, "E", hs.hints.windowHints)

-- Grid setup

hs.grid.MARGINX = 0
hs.grid.MARGINY = 0
hs.grid.GRIDWIDTH = 10
hs.grid.GRIDHEIGHT = 2

-- a helper function that returns another function that resizes the current window
-- to a certain grid size.
local gridset = function(x, y, w, h)
    return function()
        local win = hs.window.focusedWindow()
        hs.grid.set(
            win,
            {x=x, y=y, w=w, h=h},
            win:screen()
        )
    end
end

-- Maximize window
hs.hotkey.bind(cah, "M", function()
  hs.grid.maximizeWindow(hs.window.focusedWindow())
end)

-- Left 1/2 of the screen
hs.hotkey.bind(cah, "Left", gridset(0, 0, 5, 2))
-- Right 1/2 of the screen
hs.hotkey.bind(cah, "Right", gridset(5, 0, 5, 2))

-- Left 7/10 of the screen
hs.hotkey.bind(cah, "1", gridset(0, 0, 7, 2))
-- Top right corner 3/10 of the screen
hs.hotkey.bind(cah, "2", gridset(7, 0, 3, 1))
-- Bottom right corner 3/10 of the screen
hs.hotkey.bind(cah, "3", gridset(7, 1, 3, 1))
-- Bottom right corner 4/10 of the screen
hs.hotkey.bind(cah, "4", gridset(6, 1, 4, 1))

-- Shift window on grid
hs.hotkey.bind(cah, "H", function()
    hs.grid.pushWindowLeft(hs.window.focusedWindow())
end)
hs.hotkey.bind(cah, "J", function()
    hs.grid.pushWindowDown(hs.window.focusedWindow())
end)
hs.hotkey.bind(cah, "K", function()
    hs.grid.pushWindowUp(hs.window.focusedWindow())
end)
hs.hotkey.bind(cah, "L", function()
    hs.grid.pushWindowRight(hs.window.focusedWindow())
end)

-- Resize window on grid
hs.hotkey.bind(cahs, "H", function()
    hs.grid.resizeWindowThinner(hs.window.focusedWindow())
end)
hs.hotkey.bind(cahs, "J", function()
    hs.grid.resizeWindowShorter(hs.window.focusedWindow())
end)
hs.hotkey.bind(cahs, "K", function()
    hs.grid.resizeWindowTaller(hs.window.focusedWindow())
end)
hs.hotkey.bind(cahs, "L", function()
    hs.grid.resizeWindowWider(hs.window.focusedWindow())
end)

-- End Window manipulation

-- Start screensaver...  This isn't needed because we do this with
-- an OS level key binding already
--hs.hotkey.bind({"cmd", "shift"}, "L", function()
--    hs.caffeinate.startScreensaver()
--end)


hs.alert.show("Hammerspoon loaded")