sqQ7Std

--quarry square forward left
sidelength = tonumber(arg[1])
layersleft = tonumber(arg[2])
totallayers = layersleft
turnd = 0
-- turnd => turndirection
-- 0 for turn right
-- 1 for turn left

function keepup()
    while not turtle.up() do
        turtle.attackUp()
        turtle.digUp()
        checkandrefuelpurge()
        sleep(2)
    end
end

function keepdown()
    while not turtle.down() do
        turtle.attackDown()
        turtle.digDown()
        checkandrefuelpurge()
        sleep(2)
    end
end

function keepforward()
    while not turtle.forward() do
        turtle.attack()
        turtle.dig()
        checkandrefuelpurge()
        sleep(2)
    end
end

function trydigforward()
    if (turtle.detect()) then
        turtle.dig()
    end
end

function trydigdown()
    if (turtle.detectDown()) then
        turtle.digDown()
    end
end

function trydigmoveforward()
    trydigforward()
    keepforward()
end

function trydigmovedown()
    trydigdown()
    keepdown()
end

function turnaround()
    turtle.turnRight()
    turtle.turnRight()
end

function checkandrefuelpurge()
    for slot = 1, 16 do
        turtle.select(slot)
        if turtle.getFuelLevel() <= 1 then
            turtle.refuel(1)
        end
        local item = turtle.getItemDetail(slot)
        if item ~= nil then
            if item["name"] == "minecraft:cobblestone" or item["name"] == "minecraft:dirt" or item["name"] == "minecraft:stone" or item["name"] == "minecraft:netherrack" or item["name"] == "minecraft:gravel" then
                turtle.drop()
            end
        end
    end
end

function digsingleline()
    for i=1, sidelength-1 do
        trydigmoveforward()
    end
    checkandrefuelpurge()
end

function digsinglelayer()
    for i=1, sidelength-1 do
        digsingleline()
        if (turnd==0) then
            turtle.turnRight()
            trydigmoveforward()
            turtle.turnRight()
            turnd = 1
        else
            turtle.turnLeft()
            trydigmoveforward()
            turtle.turnLeft()
            turnd = 0
        end
    end
    digsingleline()
end

function digalllayers()
    trydigmoveforward()
    while (layersleft > 0) do
        digsinglelayer()
        layersleft = layersleft - 1
        if (layersleft > 0) then
            trydigmovedown()
            turnaround()
        end
    end
    for i=2, totallayers do
        keepup()
    end
    if (totallayers % 2 ~= 0) then
        if (sidelength % 2 == 0) then
            turtle.turnRight()
            for i=1, sidelength-1 do
                keepforward()
            end
            turtle.turnLeft()
            keepforward()
        else
            turtle.turnLeft()
            for i=1, sidelength-1 do
                keepforward()
            end
            turtle.turnLeft()
            for i=1, sidelength do
                keepforward()
            end
        end
    else
        keepforward()
    end
    turnaround()
end

digalllayers()