Quarry

DescentMax = 55
length = 4
width = 4
LeftOrRight = 1


function log(msg)
    file = fs.open("quarry.log", "a")
    file.write(msg)
    file.close()
end

function fw(blocks)
    for i=1, blocks do
        if turtle.detect() then
            turtle.dig()
            log("Dig a block while going forward\n")
        end
        turtle.forward()
    end
    print("Gone forward\n")
end

function dw(blocks)
    for i=1, blocks do
        if turtle.detectDown() then
            turtle.digDown()
            log("Dig a block while going down\n")
        end
        turtle.down()
    end
    print("Gone down\n")
end

function up(blocks)
    for i=1, blocks do
        if turtle.detectUp() then
            turtle.digUp()
            log("Dig a block while going up\n")
        end
        turtle.up()
    end
    print("Gone up\n")
end

fw(width)
for u=0, DescentMax do
    for x=1, length do
        print(LeftOrRight.."\n")
        turn = LeftOrRight%2
        print(turn.."\n")
        if turn == 0 then
            turtle.turnLeft()
            fw(1)
            turtle.turnLeft()
            print("Turn left")
        else
            turtle.turnRight()
            fw(1)
            turtle.turnRight()
            print("Turn right")
        end
        fw(width)
        LeftOrRight = LeftOrRight+1
    end
    dw(1)
    if turn == 1 then
        turtle.turnLeft()
        fw(1)
        turtle.turnRight()
    else
        turtle.turnRight()
        fw(1)
        turtle.turnLeft()
    end
    LeftOrRight = LeftOrRight+1
    for slot=1, 16 do
        turtle.select(slot)
        items = turtle.getItemDetail()
        if items then
            if items.name == "minecraft:dirt" or items.name == "minecraft:sand" then
                turtle.drop()
            end
            if turtle.getItemCount(15) > 1 then
                if items.name == "minecraft:cobblestone" then
                    turtle.drop()
                    turtle.select(15)
                    turtle.transferTo(slot)
                    turtle.select(slot)
                end
            end
        end
    end
    turtle.select(1)
    print("Current level :"..u)
end
turtle.turnRight()
turtle.turnRight()
fw(width)
up(DescentMax+1)