OceanTempleFiller[NoFuel]

x = 0

y = 0

z = 0

slot = 1

facing = "north"

print("Length = ?")

l = tonumber(read())

print("Width = ?")

w = tonumber(read())

function turn(direction)
    if direction == "north" then
        if facing == "west" then
            turtle.turnRight()
        end
        if facing == "south" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "east" then
            turtle.turnLeft()
        end
        facing = "north"
    end
    if direction == "west" then
        if facing == "south" then
            turtle.turnRight()
        end
        if facing == "east" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "north" then
            turtle.turnLeft()
        end
        facing = "west"
    end
    if direction == "south" then
        if facing == "east" then
            turtle.turnRight()
        end
        if facing == "north" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "west" then
            turtle.turnLeft()
        end
        facing = "south"
    end
    if direction == "east" then
        if facing == "north" then
            turtle.turnRight()
        end
        if facing == "west" then
            turtle.turnRight()
            turtle.turnRight()
        end
        if facing == "south" then
            turtle.turnLeft()
        end
        facing = "east"
    end
end

function selectSlot()
    if turtle.getItemCount(slot) == 0 and slot < 16 then
        slot = slot + 1
    elseif turtle.getItemCount(slot) == 0 and slot == 16 then
        slot = 1
    end
    turtle.select(slot)
end

function pillar()
    repeat
        selectSlot()
        turtle.placeDown()
        sleep(0.1)
        success, data = turtle.inspectDown()
    until data.name == "minecraft:sand"
end

function row()
    turn("east")
    while x < w do
        pillar()
        if turtle.forward() then
            x = x + 1
        end
    end
    while x > 0 do
        if turtle.back() then
            x = x - 1
        end
    end
end

function digPillar()
    repeat
        turtle.digDown()
        if turtle.down() then
            z = z - 1
        end
        success, data = turtle.inspectDown()
    until data.name ~= "minecraft:sand"
    while z < 0 do
        if turtle.up() then
            z = z + 1
        end
    end
end

function digRow()
    turn("east")
    while x < w do
        digPillar()
        if turtle.forward() then
            x = x + 1
        end
    end
    while x > 0 do
        if turtle.back() then
            x = x - 1
        end
    end
end

function fullDig()
    row()
    turn("north")
    while y < l do
        if turtle.forward() then
            y = y + 1
        end
        row()
        turn("south")
        if turtle.forward() then
            y = y - 1
        end
        digRow()
        turn("north")
        if turtle.forward() then
            y = y + 1
        end
    end
end

fullDig()