ComputerCraft lzLoad

--[[
/**
 * lzModuleLoader
 *
 * Loads modules that are based on the
 * JavaScript Module pattern
 *
 * @copyright (C) LayZee 2014
 */
--]]

local fileExists = function(filename)
  local file = io.open(filename, 'r')

  if file == nil then
    return false
  end

  io.close(file)

  return true
end

load = function(moduleName, aliasName)
  local filename = 'lz.' .. moduleName

  assert(
    fileExists(filename),
    'File \'' .. filename
      .. '\' does not exist'
  )

  _G.lz = _G.lz or {}

  _G.lz[moduleName] = (loadfile(filename))()

  if aliasName then
    _G.lz[aliasName] = _G.lz[moduleName]
  end

  local moduleTitle = 'lz'
    .. moduleName:gsub(
      '^%l',
      string.upper
    )

  print(moduleTitle .. ' v'
    .. _G.lz[moduleName].VERSION
    .. ' loaded'
  )
end