Turtle Slave Power

rednet.open("right")
m = peripheral.wrap("top")
m.setTextScale(0.5)

mid = 1352

function updatetime(time)
  tfile = fs.open("time","w")
  tfile.write(time)
  tfile.close()
end

function gettime()
  tfile = fs.open("time","r")
  time = tfile.readAll()
  tfile.close()
  return tonumber(time)
end

function updatecname(name)
  cnfile = fs.open("cname","w")
  cnfile.write(name)
  cnfile.close()
end

function getcname()
  cnfile = fs.open("cname","r")
  cn = cnfile.readAll()
  cnfile.close()
  return cn
end

color = {}
color.vc1 = colors.yellow
color.vc2 = colors.white

function writemon()
  term.redirect(m)
  term.clear()
  term.setCursorPos(1,1)
  term.setTextColor(color.vc1)
  print("Player:")
  term.setTextColor(color.vc2)
  print(getcname())
  term.setTextColor(color.vc1)
  print("Remaining Time:")
  term.setTextColor(color.vc2)
  print(gettime().." sec.")
  size = {term.getSize()}
  term.setCursorPos(1,size[2])
  term.setTextColor(color.vc1)
  term.write("Slave ID: ")
  term.setTextColor(color.vc2)
  term.write(os.getComputerID())
  term.restore()
end

if not fs.exists("time") then
  updatetime(0)
end
if not fs.exists("cname") then
  updatecname("No Player!")
end

ctime = gettime()
writemon()
os.startTimer(1)
while true do
  evnt = {os.pullEvent()}
  if evnt[1] == "rednet_message" then
    for i = 1,#evnt do
      print(evnt[i])
    end
    print("EOF")
    if evnt[3]:find(":") then
      args = {}
      for arg in string.gmatch(evnt[3], '([^:]+)') do
        table.insert(args,arg)
      end
      if evnt[2] == mid then
        if args[1] == "ms" and args[2] == "gs" then
          rednet.send(evnt[2],os.getComputerID())
        elseif args[1] == "ms" then
          if args[2] == tostring(os.getComputerID()) then
            if args[3] == "break" then
              turtle.dig()
            elseif args[3] == "place" then
              turtle.place()
            elseif args[3] == "rn" then
              print("I have been renamed to: "..args[4])
              updatecname(args[4])
              writemon()
            elseif args[3] == "stime" then
              updatetime(args[4])
            end
          end
        end
      end
    end
  elseif evnt[1] == "timer" then
    if gettime() ~= 0 then
      updatetime(gettime()-1)
      turtle.place()
    else
      turtle.dig()
    end
    os.startTimer(1)
    print("Timer started")
    writemon()
  end
end