Make proper modules

camera.lua

@@ -24,11 +24,14 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ]]--
 
-require 'vector'
+local setmetatable, require, love = setmetatable, require, love
+module(...)
+local vector = require(_PACKAGE..'vector')
 
 local camera = {}
 camera.__index = camera
-function Camera(pos, zoom, rot)
+
+function new(pos, zoom, rot)
 	local pos  = pos or vector(love.graphics.getWidth(), love.graphics.getHeight()) / 2
 	local zoom = zoom or 1
 	local rot  = rot or 0
@@ -42,6 +45,7 @@ end
 function camera:translate(t)
 	self.pos = self.pos + t
 end
+camera.move = camera.translate
 
 function camera:predraw()
 	local center = vector(love.graphics.getWidth(), love.graphics.getHeight()) / (self.zoom * 2)
@@ -77,3 +81,10 @@ end
 function camera:mousepos()
 	return self:toWorldCoords(vector(love.mouse.getPosition()))
 end
+
+-- camera() as a shortcut to new()
+do
+	local m = {}
+	m.__call = function(_, ...) return new(...) end
+	setmetatable(_M, m)
+end

class.lua

@@ -24,8 +24,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ]]--
 
+local setmetatable, getmetatable = setmetatable, getmetatable
+local type, assert, pairs = type, assert, pairs
+local tostring, string_format = tostring, string.format
+module(...)
+
 local function __NULL__() end
-function Class(constructor)
+function new(constructor)
 	-- check name and constructor
 	local name = '<unnamed class>'
 	if type(constructor) == "table" then
@@ -33,16 +38,16 @@ function Class(constructor)
 		constructor = constructor[1]
 	end
 	assert(not constructor or type(constructor) == "function",
-		string.format('%s: constructor has to be nil or a function', name))
+		string_format('%s: constructor has to be nil or a function', name))
 
 	-- build class
 	local c = {}
 	c.__index = c
-	c.__tostring = function() return string.format("<instance of %s>", name) end
+	c.__tostring = function() return string_format("<instance of %s>", name) end
 	c.construct = constructor or __NULL__
 	c.Construct = constructor or __NULL__
-	c.inherit = Inherit
-	c.Inherit = Inherit
+	c.inherit = inherit
+	c.Inherit = inherit
 
 	local meta = {
 		__call = function(self, ...)
@@ -56,7 +61,7 @@ function Class(constructor)
 	return setmetatable(c, meta)
 end
 
-function Inherit(class, interface, ...)
+function inherit(class, interface, ...)
 	if not interface then return end
 
 	-- __index and construct are not overwritten as for them class[name] is defined
@@ -66,5 +71,12 @@ function Inherit(class, interface, ...)
 		end
 	end
 
-	Inherit(class, ...)
+	inherit(class, ...)
+end
+
+-- class() as shortcut to class.new()
+do
+	local m = {}
+	m.__call = function(_, ...) return new(...) end
+	setmetatable(_M, m)
 end

gamestate.lua

@@ -24,12 +24,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ]]--
 
-Gamestate = {}
+local error, assert, love = error, assert, love
+module(...)
 
 local function __NULL__() end
 -- default gamestate produces error on every callback
 local function __ERROR__() error("Gamestate not initialized. Use Gamestate.switch()") end
-Gamestate.current = {
+current = {
 	enter            = __ERROR__,
 	leave            = __NULL__,
 	update           = __ERROR__,
@@ -42,7 +43,7 @@ Gamestate.current = {
 	joystickreleased = __ERROR__,
 }
 
-function Gamestate.new()
+function new()
 	return {
 		enter            = __NULL__,
 		leave            = __NULL__,
@@ -57,77 +58,77 @@ function Gamestate.new()
 	}
 end
 
-function Gamestate.switch(to, ...)
+function switch(to, ...)
 	assert(to, "Missing argument: Gamestate to switch to")
-	Gamestate.current:leave()
-	local pre = Gamestate.current
-	Gamestate.current = to
-	Gamestate.current:enter(pre, ...)
+	current:leave()
+	local pre = current
+	current = to
+	current:enter(pre, ...)
 end
 
 local _update
-function Gamestate.update(...)
+function update(...)
 	if _update then _update(...) end
-	Gamestate.current:update(...)
+	current:update(...)
 end
 
 local _draw
-function Gamestate.draw(...)
+function draw(...)
 	if _draw then _draw(...) end
-	Gamestate.current:draw(...)
+	current:draw(...)
 end
 
 local _keypressed
-function Gamestate.keypressed(...)
+function keypressed(...)
 	if _keypressed then _keypressed(...) end
-	Gamestate.current:keypressed(...)
+	current:keypressed(...)
 end
 
 local _keyreleased
-function Gamestate.keyreleased(...)
+function keyreleased(...)
 	if _keyreleased then _keyreleased(...) end
-	Gamestate.current:keyreleased(...)
+	current:keyreleased(...)
 end
 
 local _mousepressed
-function Gamestate.mousepressed(...)
+function mousepressed(...)
 	if _mousereleased then _mousepressed(...) end
-	Gamestate.current:mousepressed(...)
+	current:mousepressed(...)
 end
 
 local _mousereleased
-function Gamestate.mousereleased(...)
+function mousereleased(...)
 	if _mousereleased then _mousereleased(...) end
-	Gamestate.current:mousereleased(...)
+	current:mousereleased(...)
 end
 
 local _joystickpressed
-function Gamestate.joystickpressed(...)
+function joystickpressed(...)
 	if _joystickpressed then _joystickpressed(...) end
-	Gamestate.current:joystickpressed(...)
+	current:joystickpressed(...)
 end
 
 local _joystickreleased
-function Gamestate.joystickreleased(...)
+function joystickreleased(...)
 	if _joystickreleased then _joystickreleased(...) end
-	Gamestate.current:joystickreleased(...)
+	current:joystickreleased(...)
 end
 
-function Gamestate.registerEvents()
+function registerEvents()
 	_update               = love.update
-	love.update           = Gamestate.update
+	love.update           = update
 	_draw                 = love.draw
-	love.draw             = Gamestate.draw
+	love.draw             = draw
 	_keypressed           = love.keypressed
-	love.keypressed       = Gamestate.keypressed
+	love.keypressed       = keypressed
 	_keyreleased          = love.keyreleased
-	love.keyreleased      = Gamestate.keyreleased
+	love.keyreleased      = keyreleased
 	_mousepressed         = love.mousepressed
-	love.mousepressed     = Gamestate.mousepressed
+	love.mousepressed     = mousepressed
 	_mousereleased        = love.mousereleased
-	love.mousereleased    = Gamestate.mousereleased
+	love.mousereleased    = mousereleased
 	_joystickpressed      = love.joystickpressed
-	love.joystickpressed  = Gamestate.joystickpressed
+	love.joystickpressed  = joystickpressed
 	_joystickreleased     = love.joystickreleased
-	love.joystickreleased = Gamestate.joystickreleased
+	love.joystickreleased = joystickreleased
 end

ringbuffer.lua

@@ -24,10 +24,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ]]--
 
+local setmetatable, getmetatable, table = setmetatable, getmetatable, table
+module(...)
 local ringbuffer = {}
 ringbuffer.__index = ringbuffer
 
-function Ringbuffer(...)
+function new(...)
 	local rb = {}
 	rb.items = {...}
 	rb.current = 1
@@ -77,10 +79,7 @@ function ringbuffer:size()
 end
 
 function ringbuffer:next()
-	self.current = self.current + 1
-	if self.current > #self.items then
-		self.current = 1
-	end
+	self.current = (self.current % #self.items) + 1
 	return self:get()
 end
 
@@ -90,3 +89,10 @@ function ringbuffer:prev()
 		self.current = #self.items
 	end
 end
+
+-- Ringbuffer() as a shortcut to Ringbuffer.new()
+do
+	local m = {}
+	m.__call = function(_, ...) return new(...) end
+	setmetatable(_M, m)
+end

timer.lua

@@ -24,40 +24,44 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ]]--
 
-Timer = {}
-Timer.functions = {}
-function Timer.update(dt)
+local assert, type = assert, type
+local pairs, ipairs = pairs, ipairs
+local min = math.min
+module(...)
+
+functions = {}
+function update(dt)
 	local to_remove = {}
-	for func, delay in pairs(Timer.functions) do
+	for func, delay in pairs(functions) do
 		delay = delay - dt
 		if delay <= 0 then
 			to_remove[#to_remove+1] = func
 		else
-			Timer.functions[func] = delay
+			functions[func] = delay
 		end
 	end
 	for _,func in ipairs(to_remove) do
-		Timer.functions[func] = nil
+		functions[func] = nil
 		func(func)
 	end
 end
 
-function Timer.add(delay, func)
+function add(delay, func)
 	assert(type(func) == "function", "second argument needs to be a function")
-	Timer.functions[func] = delay
+	functions[func] = delay
 end
 
-function Timer.addPeriodic(delay, func, count)
+function addPeriodic(delay, func, count)
 	assert(type(func) == "function", "second argument needs to be a function")
 	if count then
-		Timer.add(delay, function(f) func(func) count = count - 1 if count > 0 then Timer.add(delay, f) end end)
+		add(delay, function(f) func(func) count = count - 1 if count > 0 then add(delay, f) end end)
 	else
-		Timer.add(delay, function(f) func(func) Timer.add(delay, f) end)
+		add(delay, function(f) func(func) add(delay, f) end)
 	end
 end
 
-function Timer.clear()
-	Timer.functions = {}
+function clear()
+	functions = {}
 end
 
 function Interpolator(length, func)
@@ -65,7 +69,7 @@ function Interpolator(length, func)
 	local t = 0
 	return function(dt, ...)
 		t = t + dt
-		return t <= length or nil, func(math.min(1, (t-dt)/length), ...)
+		return t <= length or nil, func(min(1, (t-dt)/length), ...)
 	end
 end
 

vector.lua

@@ -24,121 +24,133 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ]]--
 
-local Vector = {}
-Vector.__index = Vector
+local setmetatable, getmetatable = setmetatable, getmetatable
+local assert, type, tonumber = assert, type, tonumber
+local sqrt, cos, sin = math.sqrt, math.cos, math.sin
+module(...)
 
-function vector(x,y)
+local vector = {}
+vector.__index = vector
+
+function new(x,y)
 	local v = {x = x or 0, y = y or 0}
-	setmetatable(v, Vector)
+	setmetatable(v, vector)
 	return v
 end
 
 function isvector(v)
-	return getmetatable(v) == Vector
+	return getmetatable(v) == vector
 end
 
-function Vector:clone()
-	return vector(self.x, self.y)
+function vector:clone()
+	return new(self.x, self.y)
 end
 
-function Vector:unpack()
+function vector:unpack()
 	return self.x, self.y
 end
 
-function Vector:__tostring()
+function vector:__tostring()
 	return "("..tonumber(self.x)..","..tonumber(self.y)..")"
 end
 
-function Vector.__unm(a)
-	return vector(-a.x, -a.y)
+function vector.__unm(a)
+	return new(-a.x, -a.y)
 end
 
-function Vector.__add(a,b)
+function vector.__add(a,b)
 	assert(isvector(a) and isvector(b), "Add: wrong argument types (<vector> expected)")
-	return vector(a.x+b.x, a.y+b.y)
+	return new(a.x+b.x, a.y+b.y)
 end
 
-function Vector.__sub(a,b)
+function vector.__sub(a,b)
 	assert(isvector(a) and isvector(b), "Sub: wrong argument types (<vector> expected)")
-	return vector(a.x-b.x, a.y-b.y)
+	return new(a.x-b.x, a.y-b.y)
 end
 
-function Vector.__mul(a,b)
+function vector.__mul(a,b)
 	if type(a) == "number" then
-		return vector(a*b.x, a*b.y)
+		return new(a*b.x, a*b.y)
 	elseif type(b) == "number" then
-		return vector(b*a.x, b*a.y)
+		return new(b*a.x, b*a.y)
 	else
 		assert(isvector(a) and isvector(b), "Mul: wrong argument types (<vector> or <number> expected)")
 		return a.x*b.x + a.y*b.y
 	end
 end
 
-function Vector.__div(a,b)
+function vector.__div(a,b)
 	assert(isvector(a) and type(b) == "number", "wrong argument types (expected <vector> / <number>)")
-	return vector(a.x / b, a.y / b)
+	return new(a.x / b, a.y / b)
 end
 
-function Vector.__eq(a,b)
+function vector.__eq(a,b)
 	return a.x == b.x and a.y == b.y
 end
 
-function Vector.__lt(a,b)
+function vector.__lt(a,b)
 	return a.x < b.x or (a.x == b.x and a.y < b.y)
 end
 
-function Vector.__le(a,b)
+function vector.__le(a,b)
 	return a.x <= b.x and a.y <= b.y
 end
 
-function Vector.permul(a,b)
+function vector.permul(a,b)
 	assert(isvector(a) and isvector(b), "permul: wrong argument types (<vector> expected)")
-	return vector(a.x*b.x, a.y*b.y)
+	return new(a.x*b.x, a.y*b.y)
 end
 
-function Vector:len2()
+function vector:len2()
 	return self * self
 end
 
-function Vector:len()
-	return math.sqrt(self*self)
+function vector:len()
+	return sqrt(self*self)
 end
 
-function Vector.dist(a, b)
+function vector.dist(a, b)
 	assert(isvector(a) and isvector(b), "dist: wrong argument types (<vector> expected)")
 	return (b-a):len()
 end
 
-function Vector:normalize_inplace()
+function vector:normalize_inplace()
 	local l = self:len()
 	self.x, self.y = self.x / l, self.y / l
 	return self
 end
 
-function Vector:normalized()
+function vector:normalized()
 	return self / self:len()
 end
 
-function Vector:rotate_inplace(phi)
-	local c, s = math.cos(phi), math.sin(phi)
+function vector:rotate_inplace(phi)
+	local c, s = cos(phi), sin(phi)
 	self.x, self.y = c * self.x - s * self.y, s * self.x + c * self.y
 	return self
 end
 
-function Vector:rotated(phi)
+function vector:rotated(phi)
 	return self:clone():rotate_inplace(phi)
 end
 
-function Vector:perpendicular()
-	return vector(-self.y, self.x)
+function vector:perpendicular()
+	return new(-self.y, self.x)
 end
 
-function Vector:projectOn(v)
-	assert(isvector(v), "invalid argument: cannot project onto anything other than a vector.")
+function vector:projectOn(v)
+	assert(isvector(v), "invalid argument: cannot project onto anything other than a new.")
 	return (self * v) * v / v:len2()
 end
 
-function Vector:cross(other)
+function vector:cross(other)
 	assert(isvector(other), "cross: wrong argument types (<vector> expected)")
 	return self.x * other.y - self.y * other.x
 end
+
+-- vector() as shortcut to vector.new()
+do
+	local m = {}
+	m.__call = function(_, ...) return new(...) end
+	setmetatable(_M, m)
+end