ComputerCraft getSnow Program [wip]

local tArgs = {...}

local slotNum
local slotItemCount
local fullItemCount

local function returnSupplies()
    print( "Returning snow..." )
    turtle.left()
    turtle.left()
    for n=1, 16 do
        turtle.select(n)
        turtle.drop()
    end

    turtle.select(1)
end

local function collect()
    local iFull = true

    for n=1,16 do
        local nCount = turtle.getItemCount(n)
        if nCount ~= 16 then
            iFull = false
        end
    end

    if iFull then
        print( "No storage space left." )
        return false
    end
    return true
end

local function dig()
    while collect() do
        turtle.dig()
    end
end

dig()