Teleport cats and tamed wolfs to owner

3_shared.lua

@@ -0,0 +1,63 @@
+local pr = PseudoRandom(os.time()*5)
+
+local offsets = {}
+for x=-2, 2 do
+	for z=-2, 2 do
+		table.insert(offsets, {x=x, y=0, z=z})
+	end
+end
+
+--[[ Periodically check and teleport mob to owner if not sitting (order ~= "sit") and
+the owner is too far away. To be used with do_custom. Note: Optimized for mobs smaller than 1×1×1.
+Larger mobs might have space problems after teleportation.
+
+* dist: Minimum required distance from owner to teleport. Default: 12
+* teleport_check_interval: Optional. Interval in seconds to check the mob teleportation. Default: 4 ]]
+mobs_mc.make_owner_teleport_function = function(dist, teleport_check_interval)
+	return function(self, dtime)
+		-- No teleportation if no owner or if sitting
+		if not self.owner or self.order == "sit" then
+			return
+		end
+		if not teleport_check_interval then
+			teleport_check_interval = 4
+		end
+		if not dist then
+			dist = 12
+		end
+		if self._teleport_timer == nil then
+			self._teleport_timer = teleport_check_interval
+			return
+		end
+		self._teleport_timer = self._teleport_timer - dtime
+		if self._teleport_timer <= 0 then
+			self._teleport_timer = teleport_check_interval
+			local mob_pos = self.object:getpos()
+			local owner = minetest.get_player_by_name(self.owner)
+			if not owner then
+				-- No owner found, no teleportation
+				return
+			end
+			local owner_pos = owner:getpos()
+			local dist_from_owner = vector.distance(owner_pos, mob_pos)
+			if dist_from_owner > dist then
+				-- Check for nodes below air in a 5×1×5 area around the owner position
+				local check_offsets = table.copy(offsets)
+				-- Attempt to place mob near player. Must be placed on walkable node below a non-walkable one. Place inside that air node.
+				while #check_offsets > 0 do
+					local r = pr:next(1, #check_offsets)
+					local telepos = vector.add(owner_pos, check_offsets[r])
+					local telepos_below = {x=telepos.x, y=telepos.y-1, z=telepos.z}
+					table.remove(check_offsets, r)
+					-- Long story short, spawn on a platform
+					if minetest.registered_nodes[minetest.get_node(telepos).name].walkable == false and
+							minetest.registered_nodes[minetest.get_node(telepos_below).name].walkable == true then
+						-- Correct position found! Let's teleport.
+						self.object:setpos(telepos)
+						return
+					end
+				end
+			end
+		end
+	end
+end

init.lua

@@ -48,6 +48,8 @@ else
 	minetest.register_alias("_:arrow", "throwing:arrow")
 	mobs:alias_mob("_:arrow_entity", "throwing:arrow_entity")
 end
+-- Shared functions
+dofile(path .. "/3_shared.lua")
 
 --Mob heads
 dofile(path .. "/heads.lua") -- maikerumine

ocelot.lua

@@ -101,6 +101,8 @@ cat.order = "roam" -- "sit" or "roam"
 cat.owner_loyal = true
 cat.tamed = true
 cat.runaway = false
+-- Automatically teleport cat to owner
+cat.do_custom = mobs_mc.make_owner_teleport_function(12)
 cat.on_rightclick = function(self, clicker)
 	if self.child then
 		return

wolf.lua

@@ -122,6 +122,8 @@ dog.owner = ""
 -- TODO: Start sitting by default
 dog.order = "roam"
 dog.owner_loyal = true
+-- Automatically teleport dog to owner
+dog.do_custom = mobs_mc.make_owner_teleport_function(12)
 dog.on_rightclick = function(self, clicker)
 	local item = clicker:get_wielded_item()
 	if is_flesh(item:get_name()) then