From da66780a569712c23ae4f2996cfb4608a9f9d69d Mon Sep 17 00:00:00 2001
From: Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Date: Fri, 1 Apr 2016 20:02:19 -0400
Subject: copy all standard Dreambuilder mods in from the old subgame (exactly
 as last supplied there, updates to these mods will follow later)

---
 unified_inventory/group.lua | 108 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 unified_inventory/group.lua

(limited to 'unified_inventory/group.lua')

diff --git a/unified_inventory/group.lua b/unified_inventory/group.lua
new file mode 100644
index 0000000..9bf6895
--- /dev/null
+++ b/unified_inventory/group.lua
@@ -0,0 +1,108 @@
+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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