fix hud update bugs (huds which didn't disappear)

notify.lua

@@ -1,5 +1,7 @@
 local mod_name = minetest.get_current_modname()
-local huds = {}
+local hud_name = ("%s_feedback"):format(mod_name)
+
+local hud_info_by_player_name = {}
 local hud_timeout_seconds = 3
 
 -- defaults
@@ -14,20 +16,7 @@ local notify = {}
 notify.__index = notify
 setmetatable(notify, notify)
 
-local function hud_remove(player, playername)
-	local hud = huds[playername]
-	if not hud then return end
-	if os.time() < hud_timeout_seconds + hud.time then
-		return
-	end
-	if player and player.hud_remove then
-		player:hud_remove(hud.id)
-	end
-	huds[playername] = nil
-end
-
-local function hud_create(player, message, params)
-	local playername = player:get_player_name()
+local function get_hud_def(message, params)
 	local def = type(params) == "table" and params or {}
 	def.position = def.position or position
 	def.alignment = def.alignment or alignment
@@ -37,16 +26,53 @@ local function hud_create(player, message, params)
 	def.direction = def.direction or direction
 	def.text = message or def.text
 	def.hud_elem_type = def.hud_elem_type or "text"
-	def.name = mod_name .. "_feedback"
-	if player and player.hud_add then
-		local id = player:hud_add(def)
-		huds[playername] = {
-			id = id,
-			time = os.time(),
-		}
-	end
+	def.name = hud_name
+
+	return def
 end
 
+local function hud_create(player, player_name, message, params)
+	local def = get_hud_def(message, params)
+
+	local id = player:hud_add(def)
+	hud_info_by_player_name[player_name] = {
+		id = id,
+		timeout = os.time() + hud_timeout_seconds,
+	}
+end
+
+local function hud_update(player, player_name, hud_id, message, params)
+	local def = get_hud_def(message, params)
+
+	for key, value in pairs(def) do
+		player:hud_change(hud_id, key, value)
+	end
+
+	hud_info_by_player_name[player_name] = {
+		id = hud_id,
+		timeout = os.time() + hud_timeout_seconds,
+	}
+end
+
+minetest.register_globalstep(function()
+	local now = os.time()
+
+	for player_name, hud_info in pairs(hud_info_by_player_name) do
+		if now > hud_info.timeout then
+			local player = minetest.get_player_by_name(player_name)
+
+			if player then
+				local hud_def = player:hud_get(hud_info.id)
+				if hud_def and hud_def.name == hud_name then
+					player:hud_remove(hud_info.id)
+				end
+			end
+
+			hud_info_by_player_name[player_name] = nil
+		end
+	end
+end)
+
 notify.warn = function(player, message)
 	notify(player, message, {color = warning_color })
 end
@@ -59,25 +85,44 @@ end
 
 notify.error = notify.err
 
+local function is_valid_player(player)
+	return player
+		and player.get_player_name
+		and player.hud_get
+		and player.hud_add
+		and player.hud_change
+		and player.hud_remove
+end
+
 notify.__call = function(self, player, message, params)
-	local playername
+	local player_name
 	if type(player) == "string" then
-		playername = player
-		player = minetest.get_player_by_name(playername)
-	elseif player and player.get_player_name then
-		playername = player:get_player_name()
-	else
+		player_name = player
+		player = minetest.get_player_by_name(player_name)
+
+	elseif is_valid_player(player) then
+		player_name = player:get_player_name()
+	end
+
+	if not player and player_name then
 		return
 	end
-	message = "[" .. mod_name .. "] " .. message
-	local hud = huds[playername]
-	if hud and player.hud_remove then
-		player:hud_remove(hud.id)
+
+	message = ("[%s] %s"):format(mod_name, message)
+
+	local hud_info = hud_info_by_player_name[player_name]
+	local hud_def
+
+	if hud_info then
+		hud_def = player:hud_get(hud_info.id)
+	end
+
+	if hud_def and hud_def.name == hud_name then
+		hud_update(player, player_name, hud_info.id, message, params)
+
+	else
+		hud_create(player, player_name, message, params)
 	end
-	hud_create(player, message, params)
-	minetest.after(hud_timeout_seconds, function()
-		hud_remove(player, playername)
-	end)
 end
 
 return notify