digQuarry

posH = 0
posW = 0
input = 0
ready = 0
line = 0
function checkFuel()
    local fuel = turtle.getFuelLevel()
    local fuelRequired = input*18
    if fuel <= fuelRequired then
        print('Not enough fuel for this mission')
    end

    if fuel > fuelRequired then
        ready = 1
    end
end

function checkInventory()
    turtle.select(15)
    if turtle.getItemCount() > 0 then
        for i = 1, posW do
            turtle.back()
        end
        for j = 1, posH do
            turtle.up()
        end
        turtle.turnLeft()
        turtle.turnLeft()
        for k = 1, 16 do
            turtle.select(k)
            turtle.drop()
        end
        turtle.select(1)
        turtle.turnLeft()
        turtle.turnLeft()
        for l = 1, posW do
            turtle.forward()
        end
        for m = 1, posH do
            turtle.down()
        end
    end
    turtle.select(1)
end

function mineLine()
    turtle.digDown()
    turtle.down()
    posH = posH + 1
    turtle.turnLeft()
    turtle.dig()
    turtle.turnRight()
    turtle.turnRight()
    turtle.dig()
    turtle.turnLeft()
end

print('What height am I standing at?')
local number = tonumber(io.read())
if tonumber(number) ~= nil then
   input = number - 1
end

checkFuel()
    if ready == 1 then
    repeat
        for n = 1, input do
            mineLine()
            checkInventory()
        end
        for o = 1, posW do
            turtle.back()
        end
        for p = 1, posH do
            turtle.up()
        end
        turtle.turnLeft()
        turtle.turnLeft()
        for q = 1, 16 do
            turtle.select(q)
            turtle.drop()
        end
        turtle.turnLeft()
        turtle.turnLeft()
        posH = 0
        if line < 2 then
            for x = 0, line do
                turtle.forward()
            end
        end
        posW = posW + 1
        line = line + 1
    until line == 3
end