LÖVE

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local function axisValue(self)
	local value
	if type(self.axis) == 'string' then
		value = self.device:getGamepadAxis(self.axis)
	elseif type(self.axis) == 'number' then
		value = self.device:getAxis(self.axis)
	else
		error("Unknown axis type.")
	end
	return value * self.dir
end

local function isAxisButtonDown(self)
	local value = axisValue(self)
	local down
	if value >= self.downThreshold then
		down = true
	elseif value <= self.upThreshold then
		down = false
	else
		-- indeterminate: use previous value.
		down = self.down
	end
	return down
end

local function updateAxisButton(self)
	local down = isAxisButtonDown(self)
	if down ~= self.down then
		self.down = down
		if self.down then self:pressed() else self:released() end
	end
end

local function newButtonFromAxis(device, axis, dir)
	return {
		device = device, axis = axis, dir = dir or 1,
		-- Call this in `love.update` to get pressed/released callbacks.
		update = updateAxisButton,
		pressed = function(button) end,
		released = function(button) end,
		-- Call this to check whether the button is currently down.
		isDown = isAxisButtonDown,
		-- Or just read this property after calling `update`.
		down = false,
		-- Leave a little space between these to avoid possible jitter.
		downThreshold = 0.9, upThreshold = 0.75
	}
end

function love.load()
	buttons = {}
end

function love.draw()
	local u = 50
	for i,b in ipairs(buttons) do
		if b:isDown() then
			love.graphics.rectangle('fill', i * u, u, 0.9 * u, 0.9 * u)
		end
	end
end

function love.joystickadded(j)
	if j:isGamepad() then
		table.insert(buttons, newButtonFromAxis(j, 'triggerleft'))
		table.insert(buttons, newButtonFromAxis(j, 'triggerright'))
	else
		for i=1,j:getAxisCount() do
			table.insert(buttons, newButtonFromAxis(j, i))
		end
	end
	print(#buttons)
end

function love.joystickremoved(j)
	for i=#buttons,1,-1 do  -- loop backwards so it's safe to remove.
		local b = buttons[i]
		if b.device == j then  table.remove(buttons, i)  end
	end
end

function love.keypressed(k, s)
	if k == 'escape' then love.event.quit() end
end