packyourstuff

local tArgs = { ... }

local depth = 0
local xPos,zPos = 0,0
local xDir,zDir = 0,1

local goTo

local count = 0

local function turnLeft()
    turtle.turnLeft()
    xDir, zDir = -zDir, xDir
end

local function turnRight()
    turtle.turnRight()
    xDir, zDir = zDir, -xDir
end

function goTo( x, y, z, xd, zd )
    while depth > y do
        if turtle.up() then
            depth = depth - 1
        else
            turtle.digUp()
        end
    end

    if xPos > x then
        while xDir ~= -1 do
            turnLeft()
        end
        while xPos > x do
            if turtle.forward() then
                xPos = xPos - 1
            else
                turtle.dig()
            end
        end
    elseif xPos < x then
        while xDir ~= 1 do
            turnLeft()
        end
        while xPos < x do
            if turtle.forward() then
                xPos = xPos + 1
            else
                turtle.dig()
            end
        end
    end

    if zPos > z then
        while zDir ~= -1 do
            turnLeft()
        end
        while zPos > z do
            if turtle.forward() then
                zPos = zPos - 1
            else
                turtle.dig()
            end
        end
    elseif zPos < z then
        while zDir ~= 1 do
            turnLeft()
        end
        while zPos < z do
            if turtle.forward() then
                zPos = zPos + 1
            else
                turtle.dig()
            end
        end
    end

    while depth < y do
        if turtle.down() then
            depth = depth + 1
        else
            turtle.digDown()
        end
    end

    if zd ~= xd then
        while zDir ~= zd or xDir ~= xd do
            turnRight()
        end
    end
end

-- start --

turtle.select(1)
goTo(1, 1, 0, 0, -1)

local scanning = true

while scanning do
    local success, data = turtle.inspect()
    if success and data.name == "minecraft:hopper" then
        count = count + 1
        goTo(1, (1 + count), 0, 0, -1)
    else
        scanning = false
    end
end

goTo(0, 0, 0, 0, -1)
turtle.dig()
goTo(0, 0, -1, 0, -1)
turnLeft() turtle.dig() turnRight()
goTo(0, 0, -2, 1, 0)

for i=1, count do
    goTo(0, i, -2, 1, 0)
    turtle.dig() turtle.digDown()
end

goTo(1, count, -2, -1, 0)
goTo(1, count, -1, -1, 0)
goTo(1, 0, -1, -1, 0)

goTo(0, 0, 0, 0, 1)

print("Packed!")

if #tArgs > 0 then
    if tArgs[1] == "go" then
        local n = 0
        local arrived = false
        while not arrived do
            if turtle.forward() then
                n = n + 1
                if n == 16 then
                    arrived = true
                end
            else
                turtle.dig()
            end
        end
        shell.run("setup exf")
    end
end