main.lua

local World     = require('world')
local Component = require('component')
local System    = require('system')
local coms      = require('components/common_components')
local health    = require('components/health')

function new_renderer_system()
  local renderer = System.new {'body', 'rect'}

  function renderer:load(entity)
    print 'found one!'
  end

  function renderer:draw(entity)
    local body = entity:get 'body'
    love.graphics.rectangle('fill', body.x, body.y, 32, 32)
  end

  return renderer
end

function new_functional_system()
  local system = System.new {'function'}

  function system:load(entity)
  end

  function system:update(dt, entity)
    local fn = entity:get('function').fn
    fn(entity)
  end

  return system
end

function love.load()
  World:register(new_renderer_system())
  World:register(new_functional_system())

  World:create()
    :madd(coms.new_body(100, 100))
    :madd(coms.new_rectangle_component())

  World:assemble({
    { coms.new_body, 300, 100 },
    { coms.new_rectangle_component },
  })
end

function love.update(dt)
  World:update(dt)
end

function love.draw()
  World:draw()
end