fence (Ender Quarry)

function line(x)
 for i=1,x do
  while turtle.detect() do
   turtle.dig()
  end
  turtle.forward()
  turtle.digDown()
  if turtle.getItemCount(13)>0 then
   turtle.select(13)
  elseif turtle.getItemCount(14)>0 then
   turtle.select(14)
  elseif turtle.getItemCount(15)>0 then
   turtle.select(15)
  elseif turtle.getItemCount(16)>0 then
   turtle.select(16)
  end
  turtle.placeDown()
 end
end

function check(x,y)
 while true do
  total = 0
  for i=13, 16 do
   total = total + turtle.getItemCount(i)
  end
  if x+x+y+y>=total then
   print "Ograde: OK."
   break
  else
   print ("Nedovoljno ograda! Stavi još ", x+x+y+y-total, " ograda u slotove 13-16.")
  end
 end
end

--GLAVNI PROGRAM

local tArgs = {...}
local a = 0
local b = 0
a = tonumber(tArgs[1])
b = tonumber(tArgs[2])

check(a,b)
turtle.up()
line(a)
turtle.turnRight()
line(b)
turtle.turnRight()
line(a)
turtle.turnRight()
line(b)