ComputerCraft program to maintain a certain stock of items in an ender chest based on the contents of a template chest

maintain_stock.lua

-- Peripheral names
local sourceName = "storagedrawers:controllerslave_0"
local templateContainerName = "minecraft:ironchest_crystal_0"
local outputName = "minecraft:ender chest_4"

-- Wrap peripherals
local source = peripheral.wrap(sourceName)
local templateContainer = peripheral.wrap(templateContainerName)
local output = peripheral.wrap(outputName)

-- Item limit for the output chest
local itemLimit = 64

-- Main loop
while true do
    -- Fetch the template container inventory dynamically
    local templateList = templateContainer.list()

    -- Iterate over each slot in the template container
    for templateSlot, templateItem in pairs(templateList) do
        -- Fetch metadata for the template item
        local templateName = templateItem.name
        local templateMeta = templateContainer.getItemMeta(templateSlot)
        local templateRawName = templateMeta.rawName

        -- Count how many of this item are already in the output chest
        local outputList = output.list()
        local outputCount = 0
        for outputSlot, outputItem in pairs(outputList) do
            if outputItem.name == templateName then
                -- Fetch metadata to confirm rawName matches
                local outputMeta = output.getItemMeta(outputSlot)
                if outputMeta and outputMeta.rawName == templateRawName then
                    outputCount = outputCount + outputMeta.count
                end
            end
        end

        -- Calculate how many more items are needed to reach the item limit
        local neededCount = itemLimit - outputCount
        if neededCount > 0 then
            -- Fetch the source inventory dynamically
            local sourceList = source.list()

            -- Find the item in the source and transfer the required amount
            for sourceSlot, sourceItem in pairs(sourceList) do
                if sourceItem.name == templateName then
                    -- Fetch metadata to confirm rawName matches
                    local sourceMeta = source.getItemMeta(sourceSlot)
                    if sourceMeta and sourceMeta.rawName == templateRawName then
                        local transferCount = math.min(neededCount, sourceMeta.count)
                        source.pushItems(outputName, sourceSlot, transferCount)
                    end
                end
            end
        end
    end

    -- Add a small delay to prevent excessive CPU usage
    sleep(0.1)
end

I have an ender chest that I use to provide a single stack of arbitrary items to various different automation setups. This program simply maintains that ender chests's stock from a storage drawer network. The list of items to maintain is defined by the contents of the "template" chest.