mine.lua

local tArgs = { ... }
local side = 40;
if #tArgs >= 1 then
    side = tonumber(tArgs[1])
end

local api = require("api")
local ENDERCHEST_SLOT = 1

-- Blacklist
local blackIds = { "forbidden_arcanus:stella_arcanum" }
local function blacklist(data)
    for _, value in ipairs(blackIds) do
        if value == data.name then
            return true
        end
    end
    return false
end

print("Mining a square of side " .. side)

local function safeDig(i)
    local exists, blacklisted = api.checkBlacklist(blacklist, i)
    if blacklisted then return false end
    if not exists then return true end
    if not api.dig(i) then
        api.attack(i)
    end
    return true
end

local function freeupSpace()
    local dir = api.DOWN
    local exists = true
    while true do
        local blacklisted
        exists, blacklisted = api.checkBlacklist(blacklist, dir)
        if not exists or not blacklisted then
            break
        end

        if dir == api.DOWN then
            dir = api.FRONT
        elseif dir == api.FRONT then
            dir = api.UP
        elseif dir == api.UP then
            api.turn(api.RIGHT)
            dir = api.DOWN
        end
    end

    if exists then
        api.dig(dir)
    end
    api.place(dir, ENDERCHEST_SLOT)
    api.dropAll(dir)
    api.select(ENDERCHEST_SLOT)
    api.dig(dir)
end

local function ensureSpace()
    if api.freeSlots() == 0 then
        freeupSpace()
    end
end

local function mine()
    local blocksToUp = -1
    local downBy = 0
    local times = 2 * side - 1;

    for n=1,times do
        print("Segment " .. n)
        local blocks = side - math.floor(n / 2)
        for b=1,blocks do
            print("Block " .. b)
            ensureSpace()
            safeDig(api.UP)
            safeDig(api.DOWN)
            while not api.move(api.FRONT) do
                if not safeDig(api.FRONT) then
                    safeDig(api.DOWN)
                    if api.move(api.DOWN) then
                        downBy = downBy + 1
                        blocksToUp = 1
                    end
                end
            end
            while blocksToUp <= 0 and downBy > 0 do
                if not safeDig(api.UP) then
                    break
                end
                if api.move(api.UP) then
                    downBy = downBy - 1
                end
            end
            if blocksToUp > 0 then
                blocksToUp = blocksToUp - 1
            end
        end
        api.turn(api.RIGHT)
    end

    freeupSpace()
end

mine()