add immortal effect

bottles.lua

@@ -183,3 +183,28 @@ minetest.register_node("magical_potion:speed", {
 	end,
 })
 
+minetest.register_node("magical_potion:immortal", {
+	description = "Small bottle of immortal",
+	drawtype = "plantlike",
+	tiles = {"immortal_bottle_small.png"},
+	wield_image = "immortal_bottle_small.png",
+	paramtype = "light",
+	is_ground_content = false,
+	walkable = false,
+    light_source = 14,
+	selection_box = {
+		type = "fixed",
+		fixed = {-0.25, -0.5, -0.25, 0.25, 0.4, 0.25}
+	},
+	groups = {vessel=1,dig_immediate=3,attached_node=1, potion=1},
+	sounds = default.node_sound_glass_defaults(),
+	inventory_image = "immortal_bottle_small.png",
+	on_use = function(itemstack, player)
+	playereffects.apply_effect_type("immortal_bottle", 5, player)
+	if minetest.get_modpath("vessels") then
+        player:get_inventory():add_item("main", "vessels:glass_bottle")
+    end
+    itemstack:take_item(1)
+    return itemstack
+	end,
+})

functions.lua

@@ -1,4 +1,4 @@
-playereffects.register_effect_type("fly_bottle", "Fly mode available", "wings.png", {"fly"},
+playereffects.register_effect_type("fly_bottle", "Fly", "wings.png", {"fly"},
 function(player)
     local playername = player:get_player_name()
     local privs = minetest.get_player_privs(playername)
@@ -16,7 +16,7 @@ false,
 false)
 
 
-playereffects.register_effect_type("speed_bottle", "High speed", "bottle_speed.png", {"speed"},
+playereffects.register_effect_type("speed_bottle", "High speed", "speed.png", {"speed"},
 function(player)
     player:set_physics_override({speed=2})
 end,
@@ -24,3 +24,35 @@ function(effect, player)
     player:set_physics_override({speed=1})
 end
 )
+
+playereffects.register_effect_type("immortal_bottle", "Immortal", "immortal.png", {"immortal"},
+function(user)
+    if user and user:is_player() then
+        local groups = user:get_armor_groups()
+
+        playereffects.preset = groups
+        user:set_armor_groups({immortal=1})
+    end
+end,
+function(effect, user)
+    if user and user:is_player() then
+        local groups = user:get_armor_groups()
+        if groups.immortal then
+            user:set_armor_groups(playereffects.preset)
+        end
+    end
+end
+)
+
+-- TODO: integrate into different mod
+minetest.register_on_joinplayer(function(name, param)
+    minetest.after(1, function()
+        playereffects.apply_effect_type("immortal_bottle", 20, name)
+    end)
+end)
+
+minetest.register_on_newplayer(function(name, param)
+    minetest.after(1, function()
+        playereffects.apply_effect_type("immortal_bottle", 1800, name)
+    end)
+end)