Item_names: Refactorize & use meta description

item_names.lua

@@ -1,8 +1,6 @@
 -- Based on 4itemnames mod by 4aiman
 
-local wield = {}
+local item_names = {} -- [player_name] = { hud, dtime, itemname } 
-local huds = {}
-local dtimes = {}
 local dlimit = 3  -- HUD element will be hidden after this many seconds
 local air_hud_mod = minetest.get_modpath("4air")
 local hud_mod = minetest.get_modpath("hud")
@@ -16,40 +14,62 @@ local function set_hud(player)
 	elseif hudbars_mod then
 		off.y = off.y + 13
 	end
-	huds[player_name] = player:hud_add({
+	item_names[player_name] = {
+		hud = player:hud_add({
 			hud_elem_type = "text",
 			position = {x=0.5, y=1},
 			offset = off,
 			alignment = {x=0, y=0},
-		number = 0xFFFFFF ,
+			number = 0xFFFFFF,
 			text = "",
-	})
+		}),
+		dtime = dlimit,
+		index = 1,
+		itemname = ""
+	}
 end
 
 minetest.register_on_joinplayer(function(player)
 	minetest.after(0, set_hud, player)
 end)
 
+minetest.register_on_leaveplayer(function(player)
+	item_names[player:get_player_name()] = nil
+end)
+
 minetest.register_globalstep(function(dtime)
 	for _, player in pairs(minetest.get_connected_players()) do
-		local player_name = player:get_player_name()
+		local data = item_names[player:get_player_name()]
-		local wstack = player:get_wielded_item():get_name()
+		if not data or not data.hud then
+			data = {} -- Update on next step
+			set_hud(player)
+		end
 
-		if dtimes[player_name] and dtimes[player_name] < dlimit then
+		local index = player:get_wield_index()
-			dtimes[player_name] = dtimes[player_name] + dtime
+		local stack = player:get_wielded_item()
-			if dtimes[player_name] > dlimit and huds[player_name] then
+		local itemname = stack:get_name()
-				player:hud_change(huds[player_name], 'text', "")
+
+		if data.hud and data.dtime < dlimit then
+			data.dtime = data.dtime + dtime
+			if data.dtime > dlimit then
+				player:hud_change(data.hud, 'text', "")
 			end
 		end
 
-		if wstack ~= wield[player_name] then
+		if data.hud and (itemname ~= data.itemname or index ~= data.index) then
-			wield[player_name] = wstack
+			data.itemname = itemname
-			dtimes[player_name] = 0
+			data.index = index
-			if huds[player_name] then 
+			data.dtime = 0
-				local def = minetest.registered_items[wstack]
+
-				local desc = def and def.description or ""
+			local desc = stack.get_meta
-				player:hud_change(huds[player_name], 'text', desc)
+				and stack:get_meta():get_string("description")
+
+			if not desc or desc == "" then
+				-- Try to use default description when none is set in the meta
+				local def = minetest.registered_items[itemname]
+				desc = def and def.description or ""
 			end
+			player:hud_change(data.hud, 'text', desc)
 		end
 	end
 end)