added hud_notify api call

sparkapi/lua/hud_notify.lua

@@ -0,0 +1,38 @@
+notify = notify or {}
+notify.hud = notify.hud or {}
+
+-- the only API gurantee is that notify.hud.sendtext(mt_player player, string text, optional int timeout) is available
+minetest.register_on_joinplayer(function(player)
+	--register the hud elements to use later
+	--this is a simple implementation, so just one
+
+	local hud_fg = player:hud_add({
+		hud_elem_type = "text",
+		position = { x=0.5,y=0.8 },
+		text = "",
+		direction = 0,
+		number = "0xFFFFFF"
+		})
+	player:get_meta():set_int("notify_fg", hud_fg)
+end)
+
+notify.hud.sendtext = function(player, text, timeout)
+	if not player then return end
+	if not text then return end
+	if not timeout or timeout <= 0 then timeout = 1 end
+	minetest.after(1, notify.hud.timeout, player)
+	player:get_meta():set_int("time_left", timeout)
+	player:hud_change(player:get_meta():get_int("notify_fg"), "text", text)
+end
+
+notify.hud.timeout = function(player) -- checks whether player timed out yet
+	if not player then return end
+	local timeout = player:get_meta():get_int("time_left")
+	timeout = timeout -1
+	if timeout <= 0 then
+		player:hud_change(player:get_meta():get_int("notify_fg"), "text", "")
+	else
+		player:get_meta():set_int("time_left", timeout)
+		minetest.after(1, notify.hud.timeout, player)
+	end
+end