sheep.lua

turtle.select(1)
local data = turtle.getItemDetail()
while not data or data.name~="minecraft:shears" do
    print("Please insert shears into the first slot.")
    os.pullEvent("turtle_inventory")
    data = turtle.getItemDetail()
end
turtle.up()
turtle.forward()
turtle.forward()
turtle.forward()
turtle.down()
local rotateright = true
while true do
    turtle.placeDown()
    if turtle.getItemCount()==0 then
        print("Shears broke! Program stopped.")
        break
    end
    if turtle.detect() then
        if rotateright then
            turtle.turnRight()
            if turtle.detect() then break end
            turtle.up()
            turtle.forward()
            turtle.down()
            turtle.turnRight()
        else
            turtle.turnLeft()
            if turtle.detect() then break end
            turtle.forward()
            turtle.turnLeft()
        end
        rotateright = not rotateright
    else
        turtle.up()
        turtle.forward()
        turtle.down()
    end
end