desander

local args = {...}
local sand, area = 0, 0

local function fueled_forward()
    while turtle.getFuelLevel() <= 0 do
        turtle.select(1)
        turtle.refuel(1)
    end
    while turtle.detect() do
        turtle.dig()
    end
    turtle.forward()
end

local function is_sand()
    local _, data = turtle.inspectDown()
    return data.name == 'minecraft:'..args[2]
end

while true do
    for x = 1, args[1], 1 do
        for z = 1, args[1], 1 do
            if is_sand() then
                turtle.digDown()
                sand = sand + 1
            end
            fueled_forward()
            area = area + 1
            print(math.floor(sand/area*100)..'% '..args[2]..' so far')
        end
        if x%2 == 0 then
            turtle.turnLeft()
            fueled_forward()
            turtle.turnLeft()
            fueled_forward()
        else
            turtle.turnRight()
            fueled_forward()
            turtle.turnRight()
            fueled_forward()
        end
    end
    print('This layer was'..math.floor(sand/area*100)..'% '..args[2])
    if sand/area < .4 then
        print('Not much '..args[2]..' left, stopping')
        break
    end
    print('Moving on to next layer')
    sand = 0
    area = 0
    turtle.digDown()
    turtle.down()
    if args[1]%2 == 0 then
        turtle.turnLeft()
    end
end