function split_string(str, pat)
  local t = {}
  local fpat = "(.-)"..pat
  local last_end = 1
  local s, e, cap = str:find(fpat, 1)
  while s do
    if s ~= 1 or cap ~= "" then
      table.insert(t,cap)
    end
    last_end = e + 1
    s, e, cap = str:find(fpat, last_end)
  end
  if last_end <= #str then
    cap = str:sub(last_end) table.insert(t, cap)
  end
  return t
end
function clear()
   term.clear()
   term.setCursorPos (1,1)
end

while true do
  clear()
  print ("Press any key to run.")
  local event, key = os.pullEvent ("char")
  clear() 
  local source = http.get("http://example.com/turtle.txt")
  local aSource = source.readAll()
  source.close()
  local delay = 0.3
  move = split_string(aSource, ",")

  for i=1, #move do
    if move[i] == "0" then
      turtle.forward()
    elseif move[i] == "1" then
      turtle.back()
    elseif move[i] == "2" then
      turtle.turnLeft()
    elseif move[i] == "3" then
      turtle.turnRight()
    elseif move[i] == "4" then
      turtle.up()
    elseif move[i] == "5" then
      turtle.down()
    elseif move[i] == "6" then
      turtle.dig()
    end
    sleep(delay)
  end
  sleep(1.5)
end