LÖVE

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local function error_printer(msg, layer)
	print((debug.traceback("Error: " .. tostring(msg), 1+(layer or 1)):gsub("\n[^\n]+$", "")))
end
 
function love.errhand(msg)
	msg = tostring(msg)
	local path = love.filesystem.getSourceBaseDirectory()
	local file, err = io.open(path .. "/error_log.txt", "wb")
	file:write((debug.traceback("Error: " .. msg, 3):gsub("\n[^\n]+$", "")))
	file:close()
	error_printer(msg, 2)
	if not love.window or not love.graphics or not love.event then
		return
	end
	if not love.graphics.isCreated() or not love.window.isOpen() then
		local success, status = pcall(love.window.setMode, 800, 600)
		if not success or not status then
			return
		end
	end
	-- Reset state.
	if love.mouse then
		love.mouse.setVisible(true)
		love.mouse.setGrabbed(false)
		love.mouse.setRelativeMode(false)
	end
	if love.joystick then
		-- Stop all joystick vibrations.
		for i,v in ipairs(love.joystick.getJoysticks()) do
			v:setVibration()
		end
	end
	if love.audio then love.audio.stop() end
	love.graphics.reset()
	local font = love.graphics.setNewFont(math.floor(love.window.toPixels(14)))
	love.graphics.setBackgroundColor(89, 157, 220)
	love.graphics.setColor(255, 255, 255, 255)
	local trace = debug.traceback()
	love.graphics.clear(love.graphics.getBackgroundColor())
	love.graphics.origin()
	local err = {}
	table.insert(err, "Error\n")
	table.insert(err, msg.."\n\n")
	for l in string.gmatch(trace, "(.-)\n") do
		if not string.match(l, "boot.lua") then
			l = string.gsub(l, "stack traceback:", "Traceback\n")
			table.insert(err, l)
		end
	end
	local p = table.concat(err, "\n")
	p = string.gsub(p, "\t", "")
	p = string.gsub(p, "%[string \"(.-)\"%]", "%1")
	local function draw()
		local pos = love.window.toPixels(70)
		love.graphics.clear(love.graphics.getBackgroundColor())
		love.graphics.printf(p, pos, pos, love.graphics.getWidth() - pos)
		love.graphics.present()
	end
	while true do
		love.event.pump()
		for e, a, b, c in love.event.poll() do
			if e == "quit" then
				return
			elseif e == "keypressed" and a == "escape" then
				return
			elseif e == "touchpressed" then
				local name = love.window.getTitle()
				if #name == 0 or name == "Untitled" then name = "Game" end
				local buttons = {"OK", "Cancel"}
				local pressed = love.window.showMessageBox("Quit "..name.."?", "", buttons)
				if pressed == 1 then
					return
				end
			end
		end
		draw()
 		if love.timer then love.timer.sleep(0.1) end
	end
end