storage_manager.lua: first pass at a storage manager to remove waste

storage_manager.lua

@@ -0,0 +1,39 @@
+-- Program that manages a storage system
+-- For now this just means removing "waste" but in the future it could involve
+-- - Displaying information to the user
+-- - Freeing up slots where it can
+
+local SOURCES =
+{
+}
+
+local KEEP_ONLY = {}
+KEEP_ONLY["minecraft:quartz"] = 6 * 64
+KEEP_ONLY["minecraft:prismarine_shard"] = 2 * 64
+
+function remove_excess_from (waste_inv, amounts_to_keep, source)
+    for slot, item in pairs(peripheral.call(source, "list")) do
+        if amounts_to_keep[item.name] ~= nil then
+            local excess = item.count - amounts_to_keep[item.name]
+            if excess > 0 then
+                amounts_to_keep[item.name] = 0
+                local result = peripheral.call(
+                    waste_inv, "pullItems", source, slot, excess
+                )
+            else
+                amounts_to_keep[item.name] = -excess
+            end
+        end
+    end
+    return amounts_to_keep
+end
+
+function remove_waste(sources, waste_inventory, amounts_to_keep)
+    for _, src in ipairs(sources) do
+        amounts_to_keep = remove_excess_from(waste_inventory, amounts_to_keep, src)
+    end
+end
+
+while true do
+    remove_waste(SOURCES, WASTE_INV, KEEP_ONLY)
+end