pet

function forward(n)
  for i=1,n do
    if not turtle.detectDown() then
      turtle.down()
    end
    if not turtle.forward() then
      if not turtle.detectDown() then
        turtle.down()
      end
      if not turtle.up() then
        break
      end
      if not turtle.forward() then
        turtle.down()
        break
      end
    end
    if not turtle.detectDown() then
      turtle.down()
    end
  end
end
function right(n)
  turtle.turnRight()
  forward(n)
end
function left(n)
  turtle.turnLeft()
  forward(n)
end
function back(n)
  turtle.turnRight()
  turtle.turnRight()
  forward(n)
end
local L=0
while L==0 do
  dir=math.random(1,4)
  n=math.random(1,4)
  if dir==1 then
    forward(n)
  end
  if dir==2 then
    right(n)
  end
  if dir==3 then
    back(n)
  end
  if dir==3 then
    left(n)
  end
  if turtle.getFuelLevel()<100 then
    turtle.refuel()
  end
  if not (math.random(1,4)==1) then
    sleep(math.random(1,5))
  end
end