Standardise despawn logic and add asserts. Add persistent flag for mobs that have been interacted with.

mods/ENTITIES/mcl_mobs/api.lua

@@ -78,11 +78,10 @@ function mob_class:get_staticdata()
 	for _,p in pairs(minetest.get_connected_players()) do
 		self:remove_particlespawners(p:get_player_name())
 	end
+
 	-- remove mob when out of range unless tamed
 	if remove_far
-	and self.can_despawn
+	and self:despawn_allowed()
-	and self.remove_ok
-	and ((not self.nametag) or (self.nametag == ""))
 	and self.lifetimer <= 20 then
 		if spawn_logging then
 			minetest.log("action", "[mcl_mobs] Mob "..tostring(self.name).." despawns at "..minetest.pos_to_string(vector.round(self.object:get_pos())) .. " - out of range")
@@ -91,7 +90,6 @@ function mob_class:get_staticdata()
 		return "remove"-- nil
 	end
 
-	self.remove_ok = true
 	self.attack = nil
 	self.following = nil
 	self.state = "stand"

mods/ENTITIES/mcl_mobs/breeding.lua

@@ -74,6 +74,7 @@ function mob_class:feed_tame(clicker, feed_count, breed, tame, notake)
 			if self.food >= feed_count then
 				self.food = 0
 				self.horny = true
+				self.persistent = true
 			end
 		end
 

mods/ENTITIES/mcl_mobs/spawning.lua

@@ -1071,15 +1071,43 @@ if mobs_spawn then
 	end)
 end
 
+local function despawn_allowed(self)
+	local nametag = self.nametag and self.nametag ~= ""
+	local not_busy = self.state ~= "attack" and self.following == nil
+	if self.can_despawn == true then
+		if not nametag and not_busy and not self.tamed == true and not self.persistent == true then
+			return true
+		end
+	end
+	return false
+end
+
+function mob_class:despawn_allowed()
+	despawn_allowed(self)
+end
+
+
+assert(despawn_allowed({can_despawn=false}) == false, "despawn_allowed - can_despawn false failed")
+assert(despawn_allowed({can_despawn=true}) == true, "despawn_allowed - can_despawn true failed")
+
+assert(despawn_allowed({can_despawn=true, nametag=""}) == true, "despawn_allowed - blank nametag failed")
+assert(despawn_allowed({can_despawn=true, nametag=nil}) == true, "despawn_allowed - nil nametag failed")
+assert(despawn_allowed({can_despawn=true, nametag="bob"}) == false, "despawn_allowed - nametag failed")
+
+assert(despawn_allowed({can_despawn=true, state="attack"}) == false, "despawn_allowed - attack state failed")
+assert(despawn_allowed({can_despawn=true, following="blah"}) == false, "despawn_allowed - following state failed")
+
+assert(despawn_allowed({can_despawn=true, tamed=false}) == true, "despawn_allowed - not tamed")
+assert(despawn_allowed({can_despawn=true, tamed=true}) == false, "despawn_allowed - tamed")
+
+assert(despawn_allowed({can_despawn=true, persistent=true}) == false, "despawn_allowed - persistent")
+assert(despawn_allowed({can_despawn=true, persistent=false}) == true, "despawn_allowed - not persistent")
+
 function mob_class:check_despawn(pos, dtime)
 	self.lifetimer = self.lifetimer - dtime
 
 	-- Despawning: when lifetimer expires, remove mob
-	if remove_far
+	if remove_far and despawn_allowed(self) then
-	and self.can_despawn == true
-	and ((not self.nametag) or (self.nametag == ""))
-	and self.state ~= "attack"
-	and self.following == nil then
 		if self.despawn_immediately or self.lifetimer <= 0 then
 			if logging then
 				minetest.log("action", "[mcl_mobs] Mob "..self.name.." despawns at "..minetest.pos_to_string(pos, 1) .. " lifetimer ran out")

mods/ENTITIES/mobs_mc/enderman.lua

@@ -24,6 +24,12 @@
 -- added rain damage.
 -- fixed the grass_with_dirt issue.
 
+-- How freqeuntly to take and place blocks, in seconds
+local take_frequency_min = 235
+local take_frequency_max = 245
+local place_frequency_min = 235
+local place_frequency_max = 245
+
 minetest.register_entity("mobs_mc:ender_eyes", {
 	visual = "mesh",
 	mesh = "mobs_mc_spider.b3d",
@@ -60,13 +66,6 @@ end
 
 local pr = PseudoRandom(os.time()*(-334))
 
--- How freqeuntly to take and place blocks, in seconds
-local take_frequency_min = 235
-local take_frequency_max = 245
-local place_frequency_min = 235
-local place_frequency_max = 245
-
-
 -- Texuture overrides for enderman block. Required for cactus because it's original is a nodebox
 -- and the textures have tranparent pixels.
 local block_texture_overrides
@@ -491,7 +490,7 @@ mcl_mobs.register_mob("mobs_mc:enderman", {
 					local dug = minetest.get_node_or_nil(take_pos)
 					if dug and dug.name == "air" then
 						self._taken_node = node.name
-						self.can_despawn = false
+						self.persistent = true
 						local def = minetest.registered_nodes[self._taken_node]
 						-- Update animation and texture accordingly (adds visibly carried block)
 						local block_type
@@ -542,7 +541,7 @@ mcl_mobs.register_mob("mobs_mc:enderman", {
 				if success then
 					local def = minetest.registered_nodes[self._taken_node]
 					-- Update animation accordingly (removes visible block)
-					self.can_despawn = true
+					self.persistent = false
 					self.animation = select_enderman_animation("normal")
 					self:set_animation(self.animation.current)
 					if def.sounds and def.sounds.place then

mods/ENTITIES/mobs_mc/villager_zombie.lua

@@ -109,7 +109,7 @@ mcl_mobs.register_mob("mobs_mc:villager_zombie", {
 				clicker:set_wielded_item(wielditem)
 				self._curing = math.random(3 * 60, 5 * 60)
 				self.shaking = true
-				self.can_despawn = false
+				self.persistent = true
 			end
 		end
 	end,