Create Stock Network Item Counter

-- You need to connect the computer to a stock ticker and a display link from Create before you start it
-- Put this into startup.lua so it automatically starts when the computer starts (or the chunks are loaded)

-- Format the number in a shorter format
function format(num)
    if num >= 10 ^ 6 then
        return string.format("%.1fm", num / 10 ^ 6)
    elseif num >= 10 ^ 3 then
        return string.format("%.1fk", num / 10 ^ 3)
    else
        return tostring(num)
    end
end

local ticker = peripheral.find("Create_StockTicker")
local link = peripheral.find("Create_DisplayLink")

while true do
    -- Wait in the beginning so the surrounding chunks are loaded
    os.sleep(5)

    -- Get the stock of the network
    local stock = ticker.stock()
    local count = 0

    -- Count all items in the network
    -- If you want to do anything with the specific item types, this is the loop you need to change
    for _, entry in ipairs(stock) do
        count = count + entry.count
    end

    local writableCount = format(count)

    -- debug logging
    print(count)
    print(writableCount)

    -- Write to the display link
    link.clear()
    link.setCursorPos(1, 1)
    link.write(writableCount .. " Items")
    link.update()
end