love.errorhandler

Available since LÖVE 11.0
It has been renamed from love.errhand.

The error handler, used to display error messages.

Note that if the error handler itself throws error, LÖVE only prints the error in the console and exit immediately!

Function

Synopsis

mainLoop = love.errorhandler( msg )

Arguments

string msg

The error message.

Returns

function mainLoop

Function which handles one frame, including events and rendering, when called.

Examples

The default function used if you don't supply your own.

local utf8 = require("utf8")
 
local function error_printer(msg, layer)
	print((debug.traceback("Error: " .. tostring(msg), 1+(layer or 1)):gsub("\n[^\n]+$", "")))
end
 
function love.errorhandler(msg)
	msg = tostring(msg)
 
	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)
		if love.mouse.isCursorSupported() then
			love.mouse.setCursor()
		end
	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(14)
 
	love.graphics.setColor(1, 1, 1, 1)
 
	local trace = debug.traceback()
 
	love.graphics.origin()
 
	local sanitizedmsg = {}
	for char in msg:gmatch(utf8.charpattern) do
		table.insert(sanitizedmsg, char)
	end
	sanitizedmsg = table.concat(sanitizedmsg)
 
	local err = {}
 
	table.insert(err, "Error\n")
	table.insert(err, sanitizedmsg)
 
	if #sanitizedmsg ~= #msg then
		table.insert(err, "Invalid UTF-8 string in error message.")
	end
 
	table.insert(err, "\n")
 
	for l in trace:gmatch("(.-)\n") do
		if not l:match("boot.lua") then
			l = l:gsub("stack traceback:", "Traceback\n")
			table.insert(err, l)
		end
	end
 
	local p = table.concat(err, "\n")
 
	p = p:gsub("\t", "")
	p = p:gsub("%[string \"(.-)\"%]", "%1")
 
	local function draw()
		local pos = 70
		love.graphics.clear(89/255, 157/255, 220/255)
		love.graphics.printf(p, pos, pos, love.graphics.getWidth() - pos)
		love.graphics.present()
	end
 
	local fullErrorText = p
	local function copyToClipboard()
		if not love.system then return end
		love.system.setClipboardText(fullErrorText)
		p = p .. "\nCopied to clipboard!"
		draw()
	end
 
	if love.system then
		p = p .. "\n\nPress Ctrl+C or tap to copy this error"
	end
 
	return function()
		love.event.pump()
 
		for e, a, b, c in love.event.poll() do
			if e == "quit" then
				return 1
			elseif e == "keypressed" and a == "escape" then
				return 1
			elseif e == "keypressed" and a == "c" and love.keyboard.isDown("lctrl", "rctrl") then
				copyToClipboard()
			elseif e == "touchpressed" then
				local name = love.window.getTitle()
				if #name == 0 or name == "Untitled" then name = "Game" end
				local buttons = {"OK", "Cancel"}
				if love.system then
					buttons[3] = "Copy to clipboard"
				end
				local pressed = love.window.showMessageBox("Quit "..name.."?", "", buttons)
				if pressed == 1 then
					return 1
				elseif pressed == 3 then
					copyToClipboard()
				end
			end
		end
 
		draw()
 
		if love.timer then
			love.timer.sleep(0.1)
		end
	end
 
end

See Also

• love