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function unified_inventory.canonical_item_spec_matcher(spec)
local specname = ItemStack(spec):get_name()
if specname:sub(1, 6) == "group:" then
local group_names = specname:sub(7):split(",")
return function (itemname)
local itemdef = minetest.registered_items[itemname]
for _, group_name in ipairs(group_names) do
if (itemdef.groups[group_name] or 0) == 0 then
return false
end
end
return true
end
else
return function (itemname) return itemname == specname end
end
end
function unified_inventory.item_matches_spec(item, spec)
local itemname = ItemStack(item):get_name()
return unified_inventory.canonical_item_spec_matcher(spec)(itemname)
end
unified_inventory.registered_group_items = {
mesecon_conductor_craftable = "mesecons:wire_00000000_off",
stone = "default:cobble",
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.
--
-- The parameter to this function isn't just a single group name.
-- It may be a comma-separated list of group names. This is really a
-- "group:..." ingredient specification, minus the "group:" prefix.
local function compute_group_item(group_name_list)
local group_names = group_name_list:split(",")
local candidate_items = {}
for itemname, itemdef in pairs(minetest.registered_items) do
if (itemdef.groups.not_in_creative_inventory or 0) == 0 then
local all = true
for _, group_name in ipairs(group_names) do
if (itemdef.groups[group_name] or 0) == 0 then
all = false
end
end
if all then table.insert(candidate_items, itemname) end
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 is_group = {}
local registered_rep = {}
for _, group_name in ipairs(group_names) do
is_group[group_name] = true
local rep = unified_inventory.registered_group_items[group_name]
if rep then registered_rep[rep] = true end
end
local bestitem = ""
local bestpref = 0
for _, item in ipairs(candidate_items) do
local pref
if registered_rep[item] then
pref = 4
elseif string.sub(item, 1, 8) == "default:" and is_group[string.sub(item, 9)] then
pref = 3
elseif is_group[item:gsub("^[^:]*:", "")] 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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