require

local shell
function setShell(s)
  shell=s
  _G.require.setShell=nil
end

function require(path)
  if _G[path]~=nil then return end -- stuff

  local modulePath=shell.resolve(".")
  for part in  string.gmatch(path,"[^%.]+") do
    local can = modulePath.."/"..part
    if fs.exists(can) then
      modulePath=can
    elseif fs.exists(can..".lua") then
      modulePath=can..".lua"
    end
  end
  if modulePath == shell.resolve(".") then
    return nil
  else
    return loadfile(modulePath)()
  end
end