Körperbewegung

mods/modlib/minetest/wielditem_change.lua

@@ -0,0 +1,66 @@
+-- Localize globals
+local minetest, modlib, pairs, table = minetest, modlib, pairs, table
+
+-- Set environment
+local _ENV = ...
+setfenv(1, _ENV)
+
+players = {}
+
+registered_on_wielditem_changes = {function(...)
+	local _, previous_item, _, item = ...
+	if previous_item then
+		((previous_item:get_definition()._modlib or {}).un_wield or modlib.func.no_op)(...)
+	end
+	if item then
+		((item:get_definition()._modlib or {}).on_wield or modlib.func.no_op)(...)
+	end
+end}
+
+--+ Registers an on_wielditem_change callback: function(player, previous_item, previous_index, item)
+--+ Will be called once with player, nil, index, item on join
+register_on_wielditem_change = modlib.func.curry(table.insert, registered_on_wielditem_changes)
+
+local function register_callbacks()
+	minetest.register_on_joinplayer(function(player)
+		local item, index = player:get_wielded_item(), player:get_wield_index()
+		players[player:get_player_name()] = {
+			wield = {
+				item = item,
+				index = index
+			}
+		}
+		modlib.table.icall(registered_on_wielditem_changes, player, nil, index, item)
+	end)
+	minetest.register_on_leaveplayer(function(player)
+		players[player:get_player_name()] = nil
+	end)
+end
+
+-- Other on_joinplayer / on_leaveplayer callbacks should execute first
+if minetest.get_current_modname() then
+	-- Loaded during load time, register callbacks after load time
+	minetest.register_on_mods_loaded(register_callbacks)
+else
+	-- Loaded after load time, register callbacks immediately
+	register_callbacks()
+end
+
+-- TODO export
+local function itemstack_equals(a, b)
+	return a:get_name() == b:get_name() and a:get_count() == b:get_count() and a:get_wear() == b:get_wear() and a:get_meta():equals(b:get_meta())
+end
+
+minetest.register_globalstep(function()
+	for _, player in pairs(minetest.get_connected_players()) do
+		local item, index = player:get_wielded_item(), player:get_wield_index()
+		local playerdata = players[player:get_player_name()]
+		if not playerdata then return end
+		local previous_item, previous_index = playerdata.wield.item, playerdata.wield.index
+		if not (itemstack_equals(item, previous_item) and index == previous_index) then
+			playerdata.wield.item = item
+			playerdata.wield.index = index
+			modlib.table.icall(registered_on_wielditem_changes, player, previous_item, previous_index, item)
+		end
+	end
+end)