Add basic message framework

mods/lzr_levels/init.lua

@@ -90,15 +90,15 @@ function lzr_levels.start_level(level)
 	reset_inventory(player)
 	player:set_pos({x=5,y=2,z=5})
 	lzr_levels.prepare_and_build_level(level)
+	lzr_messages.show_message(player, S("Level @1", level), 3)
 end
 
 function lzr_levels.next_level()
 	local player = get_singleplayer()
 	current_level = current_level + 1
 	if current_level > 10 then
-		minetest.chat_send_player("singleplayer", S("Yarrrr! You finished the last level!"))
+		lzr_messages.show_message(player, S("Final level completed!"), 5)
 	else
-		minetest.chat_send_player("singleplayer", S("Yarr! Level @1 completed!", current_level - 1))
 		lzr_levels.start_level(current_level)
 	end
 end

mods/lzr_messages/init.lua

@@ -0,0 +1,49 @@
+lzr_messages = {}
+
+local message_handles = {}
+local message_timers = {}
+
+function lzr_messages.show_message(player, text, duration)
+	local playername = player:get_player_name()
+	local id
+	if message_handles[playername] then
+		id = message_handles[playername]
+		player:hud_change(id, "text", text)
+	else
+		id = player:hud_add({
+			hud_elem_type = "text",
+			position = { x = 0.5, y = 0.5 },
+			name = "message",
+			text = text,
+			number = 0xFFFFFF,
+			alignment = { x = 0, y = -1 },
+			offset = { x = 0, y = -32 },
+			scale = { x = 100, y = 100 },
+			size = { x = 3, y = 3 },
+			z_index = 0,
+		})
+	end
+	message_handles[playername] = id
+	message_timers[playername] = duration
+	return id
+end
+
+minetest.register_on_leaveplayer(function(player)
+	message_handles[player:get_player_name()] = nil
+	message_timers[player:get_player_name()] = nil
+end)
+
+minetest.register_globalstep(function(dtime)
+	local players = minetest.get_connected_players()
+	for p=1, #players do
+		local name = players[p]:get_player_name()
+		if message_timers[name] then
+			message_timers[name] = message_timers[name] - dtime
+			if message_timers[name] <= 0 then
+				players[p]:hud_remove(message_handles[name])
+				message_handles[name] = nil
+				message_timers[name] = nil
+			end
+		end
+	end
+end)