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unified_inventory.registered_group_items = {
mesecon_conductor_craftable = "mesecons:wire_00000000_off",
wool = "wool:white",
}
function unified_inventory.register_group_item(groupname, itemname)
unified_inventory.registered_group_items[groupname] = itemname
end
-- This is used when displaying craft recipes, where an ingredient is
-- specified by group rather than as a specific item. A single-item group
-- is represented by that item, with the single-item status signalled
-- in the "sole" field. If the group contains no items at all, the item
-- field will be nil.
--
-- Within a multiple-item group, we prefer to use an item that has the
-- same specific name as the group, and if there are more than one of
-- those items we prefer the one registered for the group by a mod.
-- Among equally-preferred items, we just pick the one with the
-- lexicographically earliest name.
function compute_group_item(group_name)
local candidate_items = {}
for itemname, itemdef in pairs(minetest.registered_items) do
if (itemdef.groups.not_in_creative_inventory or 0) == 0 and
(itemdef.groups[group_name] or 0) ~= 0 then
table.insert(candidate_items, itemname)
end
end
local num_candidates = #candidate_items
if num_candidates == 0 then
return {sole = true}
elseif num_candidates == 1 then
return {item = candidate_items[1], sole = true}
end
local bestitem = ""
local bestpref = 0
for _, item in ipairs(candidate_items) do
local pref
if item == unified_inventory.registered_group_items[group_name] then
pref = 3
elseif item:gsub("^[^:]+:", "") == group_name then
pref = 2
else
pref = 1
end
if pref > bestpref or (pref == bestpref and item < bestitem) then
bestitem = item
bestpref = pref
end
end
return {item = bestitem, sole = false}
end
local group_item_cache = {}
function unified_inventory.get_group_item(group_name)
if not group_item_cache[group_name] then
group_item_cache[group_name] = compute_group_item(group_name)
end
return group_item_cache[group_name]
end
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