loader.lua

-- Based on this: http://lua-users.org/wiki/LuaModulesLoader
module(..., package.seeall)

local function loader(modulename)
  local errmsg = ""
  local modulepath = string.gsub(modulename, "%.", "/")
  local dirname = modulepath:match("(.*[/\\])")
  local basename = modulepath:match("^.+/(.+)$")
  for path in string.gmatch(package.path, "([^;]+)") do
    local filename = string.gsub(path, "%?", table.concat({dirname, basename, "/", basename}))
    local file = io.open(filename, "rb")
    if file then
      return assert(loadstring(assert(file:read("*a")), filename))
    end
    errmsg = errmsg.."\n\tno file '"..filename.."' (checked with custom loader)"
  end
  return errmsg
end

table.insert(package.loaders, 3, loader)

Most modules are singleton and has the same name as its directory. This let you load module *sorter*.

Before:

local inspect = require("path.to.vendor.inspect.inspect")

After

local inspect = require("path.to.vendor.inspect")