flatten.lua

function fixChunk()
    local i = 2
    turtle.select(2)
    if turtle.detectDown() and not turtle.compareDown() then
        turtle.digDown()
    end

    if not turtle.detectDown() then
        while turtle.getItemCount(i) < 2 do
            i = i+1
        end
        turtle.select(i)
        turtle.placeDown()
    end
end

function forward()
    while turtle.detect() do
        turtle.dig()
        sleep(0.5)
    end
    flag = turtle.forward()
    while not flag do
        turtle.attack()
        sleep(0.5)
        flag = turtle.forward()
    end
end

function backAndForth()
    local i


    turtle.select(1)
    while turtle.getFuelLevel() < 40 do
        turtle.refuel(1)
    end

    for i=0,14,1 do
        fixChunk()
        forward()
    end
    fixChunk()
    turtle.turnLeft()
    forward()
    turtle.turnLeft()
    for i=0,14,1 do
        fixChunk()
        forward()
    end
    fixChunk()
end

function lawn()
    local i

    for i = 0,6,1 do
        backAndForth()
        turtle.turnRight()
        forward()
        turtle.turnRight()
    end
    backAndForth()
    turtle.turnLeft()
    for i=1,15,1 do
        forward()
    end
end

lawn()