Reworked the Hostile mob friends list to use weakrefs (#30253)

code/game/objects/items/weapons/storage/belt.dm

@@ -448,7 +448,7 @@
 			var/mob/living/simple_animal/hostile/humanoid/H = NM
 			H.items_to_drop = list()
 		NM.faction = "lazarus \ref[user]"
-		NM.friends += user
+		NM.friends += makeweakref(user)
 		MC.contained_mob = NM
 		MC.name = "lazarus capsule - [NM.name]"
 	..()

code/modules/mining/mine_items.dm

@@ -823,7 +823,7 @@ proc/move_mining_shuttle()
 				M.revive(refreshbutcher = refreshes_drops)
 				if(istype(target, /mob/living/simple_animal/hostile))
 					var/mob/living/simple_animal/hostile/H = M
-					H.friends += user
+					H.friends += makeweakref(user)
 
 					log_attack("[key_name(user)] has revived hostile mob [H] with a lazarus injector.")
 					H.attack_log += "\[[time_stamp()]\] Revived by <b>[key_name(user)]</b> with a lazarus injector."
@@ -965,14 +965,10 @@ proc/move_mining_shuttle()
 	update_icon()
 
 /obj/item/device/mobcapsule/proc/take_contents(mob/user)
-	for(var/mob/living/simple_animal/AM in src.loc)
+	for(var/mob/living/simple_animal/hostile/AM in loc)
-		if(istype(AM))
+		for(var/datum/weakref/things in AM.friends)
-			var/mob/living/simple_animal/M = AM
+			var/mob/M = things.get()
-			var/mob/living/simple_animal/hostile/H = M
+			if(capsuleowner == M)
-			if(!istype(H))
-				continue
-			for(var/things in H.friends)
-				if(capsuleowner in H.friends)
 				if(insert(AM, user) == -1) //Limit reached
 					break
 

code/modules/mob/living/simple_animal/hostile/carp.dm

@@ -151,8 +151,12 @@
 			user.drop_item(F, force_drop = 1)
 
 			if(prob(25))
-				if(!friends.Find(user))
+				var/already_friend = FALSE
-					friends.Add(user)
+				for(var/datum/weakref/ref in friends)
+					if (ref.get() == user)
+						already_friend = TRUE
+				if (!already_friend)
+					friends += makeweakref(user)
 					to_chat(user, "<span class='info'>You have gained \the [src]'s trust.</span>")
 					var/image/heart = image('icons/mob/animal.dmi',src,"heart-ani2")
 					heart.plane = ABOVE_HUMAN_PLANE

code/modules/mob/living/simple_animal/hostile/deer.dm

@@ -27,7 +27,8 @@
 				D.get_spooked(new_target)
 
 /mob/living/simple_animal/hostile/deer/proc/is_spooked(var/mob/living/target)
-	if(friends.Find(target))
+	for(var/datum/weakref/ref in friends)
+		if (ref.get() == target)
 			return 0
 	if(ishuman(target))
 	/*
@@ -104,8 +105,12 @@
 			icon_state = "deer_flower"
 
 		if(prob(25))
-			if(!friends.Find(user))
+			var/already_friend = FALSE
-				friends.Add(user)
+			for(var/datum/weakref/ref in friends)
+				if (ref.get() == user)
+					already_friend = TRUE
+			if (!already_friend)
+				friends += makeweakref(user)
 				to_chat(user, "<span class='info'>You have gained \the [src]'s trust.</span>")
 			name_mob(user)
 		qdel(A)

code/modules/mob/living/simple_animal/hostile/hostile.dm

@@ -206,7 +206,9 @@
 		if((istype(L,/mob/living/simple_animal/corgi/Ian) || istype(L,/mob/living/carbon/human/dummy)) && (faction == "adminbus mob"))
 			return 0
 		//WE DON'T ATTACK OUR FRIENDS (used by lazarus injectors, and rabid slimes)
-		if(friends.Find(L))
+
+		for(var/datum/weakref/ref in friends)
+			if (ref.get() == L)
 				return 0
 		return 1
 	if(isobj(the_target))
@@ -346,7 +348,15 @@
 
 	var/mob/living/simple_animal/hostile/H = from
 	if(istype(H))
-		src.friends |= H.friends
+		for (var/datum/weakref/ref in H.friends)
+			var/not_a_friend_yet = TRUE
+			var/mob/M = ref.get()
+			for (var/datum/weakref/reff in H.friends)
+				if (M == reff.get())
+					not_a_friend_yet = FALSE
+					break
+			if (not_a_friend_yet)
+				friends += makeweakref(M)
 
 /mob/living/simple_animal/hostile/proc/OpenFire(var/atom/ttarget)
 	set waitfor = 0

code/modules/mob/living/simple_animal/hostile/necro.dm

@@ -13,7 +13,7 @@
 			key = mind.key // Force the ghost in here
 	if(Owner)
 		faction = "necro"
-		friends.Add(Owner)
+		friends += makeweakref(Owner)
 		creator = Owner
 		if(client)
 			to_chat(src, "<big><span class='warning'>You have been risen from the dead by your new master, [Owner]. Do his bidding so long as he lives, for when he falls so do you.</span></big>")

code/modules/mob/living/simple_animal/hostile/pitbull.dm

@@ -58,7 +58,7 @@
 	faction_original = faction
 	faction = ""
 	friends_temp = friends.Copy()
-	friends.Cut()
+	friends = list()
 	treacherous = TRUE
 
 /mob/living/simple_animal/hostile/pitbull/proc/Calmdown()

code/modules/mob/living/simple_animal/hostile/slime.dm

@@ -52,7 +52,7 @@
 		rabid.icon_dead = "[src.colour] baby slime dead"
 		rabid.colour = "[src.colour]"
 		for(var/mob/M in friends)
-			rabid.friends += M
+			rabid.friends += makeweakref(M)
 	qdel(src)
 
 /mob/living/simple_animal/hostile/slime/Life()
@@ -79,8 +79,10 @@
 		calmed_type = text2path("/mob/living/carbon/slime/" + path_end)
 
 	var/mob/living/carbon/slime/calmed = new calmed_type(loc)
-	for(var/mob/M in friends)
+	for(var/datum/weakref/ref in friends)
-		calmed.Friends += M
+		var/mob/M = ref.get()
+		if (istype(M))
+			calmed.Friends = M
 
 	qdel(src)
 
@@ -91,7 +93,9 @@
 		calmed_type = text2path("/mob/living/carbon/slime/adult/" + path_end)
 
 	var/mob/living/carbon/slime/calmed = new calmed_type(loc)
-	for(var/mob/M in friends)
+	for(var/datum/weakref/ref in friends)
-		calmed.Friends += M
+		var/mob/M = ref.get()
+		if (istype(M))
+			calmed.Friends = M
 
 	qdel(src)

code/modules/power/gourmonger.dm

@@ -93,7 +93,8 @@ var/global/gourmonger_saturation = 0
 					return 0
 		if((istype(L,/mob/living/carbon/human/dummy)) && (faction == "adminbus mob"))
 			return 0
-		if(friends.Find(L))
+		for(var/datum/weakref/ref in friends)
+			if (ref.get() == L)
 				return 0
 		if(!L.stat && !hangry)	//So we attack corpses but not living creatures unless we're starving
 			return 0