Flatten.lua

function clearUpAndDown(ceiling)
    local i = 0
    while i < ceiling do
        while turtle.detectUp() do
            turtle.digUp()
            sleep(0.5)
        end
        turtle.up()
        i = i+1
    end
    forward()
    while i > 0 do
        while turtle.detectDown() do
            turtle.digDown()
            sleep(0.5)
        end
        turtle.down()
        i = i-1
    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(ceiling)
    local i
    for i = 0, 6, 1 do
        clearUpAndDown(ceiling)
        forward()
    end
    clearUpAndDown(ceiling)
    turtle.turnLeft()
    forward()
    turtle.turnLeft()
    for i = 0, 6, 1 do
        clearUpAndDown(ceiling)
        forward()
    end
    clearUpAndDown(ceiling)
end

function clearChunk(ceiling)
    local fuelLevel = ceiling * 40
    for i = 0,6,1 do
        while turtle.getFuelLevel() < fuelLevel do
            turtle.select(1)
            turtle.refuel(1)
        end
        backAndForth(ceiling)
        turtle.turnRight()
        forward()
        turtle.turnRight()
        if turtle.getItemCount(13) > 0 then
            turtle.turnRight()
            for j = 1,2 * (i+1),1 do
                turtle.forward()
            end
            turtle.turnRight()
            for j = 2,16,1 do
                turtle.select(j)
                turtle.drop()
            end
            turtle.turnRight()
            for j = 1,2 * (i+1),1 do
                turtle.forward()
            end
            turtle.turnRight()
        end
    end
    while turtle.getFuelLevel() < fuelLevel do
        turtle.select(1)
        turtle.refuel(1)
    end
    backAndForth(ceiling)
    turtle.turnLeft()
    for i = 0,14,1 do
        turtle.forward()
    end
    turtle.turnRight()
end

clearChunk(8)