wyvern/IO.lua

local d = require "luadash"
local w = require "lib"

local conf = w.load_config({
    "chest",
    "items",
    "sleep_time"
}, {
    sleep_time = 1,
    items = {}
})

w.init()

local chest = peripheral.wrap(conf.chest)

while true do
    local stacks_stored = d.map(chest.list(), w.to_wyvern_item)
    local items_stored = w.collate_stacks(stacks_stored)

    for item_name, quantity_desired in pairs(conf.items) do
        local quantity_stocked = items_stored[item_name] or 0
        if quantity_desired > quantity_stocked then -- if we have fewer items than are desired, extract some from store
            local request = w.string_to_item(item_name)
            request.type = "extract"
            request.destination_inventory = w.chest
            w.unwrap(w.query_by_type("storage", request), "extracting items")
        end
    end

    for slot, item in pairs(stacks_stored) do
        if not conf.items[w.get_internal_identifier(item)] then -- if item is not in want list, send it back to storage
            w.unwrap(w.query_by_type("storage", {
                type = "insert",
                from_inventory = conf.chest,
                from_slot = slot
            }), "inserting items")
        end
    end

    sleep(conf.sleep_time)
end