lua: module reloader

loader.lua

-- -*- Mode: lua; tab-width: 2; lua-indent-level: 2; indent-tabs-mode: nil; -*-

local loader = {}
local package = require "package"

loader.last_err = false
loader.last_err_msg = nil

function loader.load(module)
  return require(module)
end

function loader.reload(module)
  if package.loaded[module] == nil then
    -- initial load
    return require(module)
  else
    -- reload
    local oldmod = package.loaded[module]
    package.loaded[module] = nil
    local ok, obj = pcall(require, module)
    if ok then
      loader.last_err = false
      return obj
    else
      loader.last_err = true
      loader.last_err_msg = obj
      package.loaded[module] = oldmod
      return oldmod
    end
  end
end

return loader