modlib/minetest/wielditem_change.lua
2021-10-20 19:21:27 +02:00

66 lines
2.3 KiB
Lua

-- 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)