MineClone2/mods/CORE/mcl_groupcache/init.lua

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mcl_groupcache = {
cache = {},
}
local function check_insert(item, group, cache)
if minetest.get_item_group(item, group) ~= 0 then
table.insert(cache, item)
end
end
local old_register_item = minetest.register_item
function minetest.register_item(name, def)
old_register_item(name, def)
for group, cache in pairs(mcl_groupcache.cache) do
check_insert(item, group, cache)
end
end
function mcl_groupcache.init_cache(group)
local cache = {}
for item in pairs(minetest.registered_items) do
check_insert(item, group, cache)
end
return cache
end
function mcl_groupcache.get_items_in_group(group)
local cache = mcl_groupcache.cache[group] or mcl_groupcache.init_cache(group)
mcl_groupcache.cache[group] = cache
return cache
end