matts-hammperspoon_config.lua

-- Great stuff at https://github.com/cmsj/hammerspoon-config

local hyper = {"ctrl", "alt", "cmd"}

local laptopScreen = "Color LCD"  -- 1440 x 900
local thunderboltScreen = "DELL P2715Q"

-- Defines for screen watcher
local screenWatcher = nil
local lastNumberOfScreens = #hs.screen.allScreens()

--local leftOffsetRect = hs.geometry.rect(280, 0, 1160, 900)
local leftOffsetRect = hs.geometry.rect(280, 0, 1400, 1050)

local singleScreenLayout = {
	{"Slack",  			nil,	laptopScreen, hs.layout.maximized, nil, nil},
	{"iTerm",  			nil,	laptopScreen, nil, nil, leftOffsetRect},
	{"iTerm2",  			nil,	laptopScreen, nil, nil, leftOffsetRect},
	{"Sublime Text", 	nil,	laptopScreen, nil, nil, leftOffsetRect},
	{"Notes",  			nil,	laptopScreen, nil, nil, leftOffsetRect},
	{"Google Chrome",  	nil,	laptopScreen, nil, nil, leftOffsetRect},
	{"Spotify",  		nil,	laptopScreen, nil, nil, leftOffsetRect}
}

local multiScreenLayout = {
	{"Slack",  			nil,	laptopScreen, hs.layout.maximized, nil, nil},
	{"iTerm",  			nil,	thunderboltScreen, hs.layout.right50,    nil, nil},
	{"iTerm2",  			nil,	thunderboltScreen, hs.layout.right50,    nil, nil},
	{"Sublime Text", 	nil,	thunderboltScreen, hs.layout.left50,   nil, nil},
	{"Notes",  			nil,	laptopScreen, nil, nil, leftOffsetRect},
	{"Google Chrome",  	nil,	laptopScreen, nil, nil, leftOffsetRect},
	{"Spotify",  		nil,	laptopScreen, nil, nil, leftOffsetRect}
}



-- Callback function for changes in screen layout
function screensChangedCallback()
	newNumberOfScreens = #hs.screen.allScreens()

	if lastNumberOfScreens ~= newNumberOfScreens then
		if newNumberOfScreens == 1 then
			hs.alert.show("Switching to single-screen layout")
			hs.layout.apply(singleScreenLayout)
		else
			hs.alert.show("Switching to multi-screen layout")
			hs.layout.apply(multiScreenLayout)
		end
	end

	lastNumberOfScreens = newNumberOfScreens
end

-- Replace Caffeine.app with 18 lines of Lua :D
-- NOTE: If you reload your config on a hotkey or a pathwatcher, you should call caffeine:delete() there
local caffeine = hs.menubar.new()

function setCaffeineDisplay(state)
	local result
	if state then
		result = caffeine:setIcon("caffeine-on.pdf")
	else
		result = caffeine:setIcon("caffeine-off.pdf")
	end
end

function caffeineClicked()
	setCaffeineDisplay(hs.caffeinate.toggle("displayIdle"))
end

if caffeine then
	caffeine:setClickCallback(caffeineClicked)
	setCaffeineDisplay(hs.caffeinate.get("displayIdle"))
end


function reloadConfig()
	screenWatcher:stop()
	screenWatcher = nil
	caffeine:delete()
	hs.reload()
end

hs.hotkey.bind(hyper , "L", function()
  hs.caffeinate.lockScreen()
end)

hs.hotkey.bind(hyper , "X", function()
  hs.alert.show(hs.screen.allScreens())
end)

hs.hotkey.bind(hyper , "R", function()
  reloadConfig()
  hs.alert.show("Config loaded")
end)

hs.hotkey.bind(hyper , "Z", function()
	if #hs.screen.allScreens() == 1 then
		hs.alert.show("Applying single-screen layout")
		hs.layout.apply(singleScreenLayout)
	else
		hs.alert.show("Applying multi-screen layout")
		hs.layout.apply(multiScreenLayout)
	end
end)

screenWatcher = hs.screen.watcher.new(screensChangedCallback)
screenWatcher:start()