Farming turtle

--Program pro farmici zelvu pro farmareni
--Verze programu beta 0.8.1
--vytvoril SVty
--*****************************

print("Napiste delku farmy:")
delka = (read())
print("Delka farmy je "..delka.. " kostek")
print("Zadejte sirku farmy:")
sir = (read())
print("Sirka farmy je "..sir.." kostek")
sir = sir /2
sleep(1)

function palivo()
  if (turtle.getFuelLevel()) < 20 then
    turtle.select(16)
    turtle.refuel(4)
    turtle.select(1)
    print("doplnuji palivo")
  end
end

palivo()
if (turtle.detectDown()) then
  turtle.up()
  turtle.forward()
else
  turtle.forward()
end

function left()
turtle.turnLeft()
turtle.forward()
turtle.turnLeft()
turtle.forward()
end

function right()
turtle.turnRight()
turtle.forward()
turtle.turnRight()
turtle.forward()
end

function farm()
  for del=1,delka do
    turtle.digDown()
    turtle.digDown()
    turtle.select(1)
    turtle.placeDown()
    turtle.forward()
    del = del + 1
    print(del)
    palivo()
  end
end

function retu()
  sir = sir *2
  turtle.turnLeft()
    for c=1,sir do
    turtle.forward()
    end
  turtle.turnLeft()
  turtle.forward()
  turtle.turnLeft()
  turtle.turnLeft()
end

--program
for d=1,sir do
  farm()
  right()
  farm()
  left()
end
--program

retu()
print("HOTOVO")