Initial

code/controllers/subsystem/xeno_ai.dm

@@ -9,12 +9,10 @@ SUBSYSTEM_DEF(xeno_ai)
 	/// A list of AI mobs
 	var/list/ai_mobs = list()
 
-	var/game_evaluation = 0
-
 	var/ai_kill = FALSE
 
 /datum/controller/subsystem/xeno_ai/stat_entry(msg)
-	msg = "P:[length(ai_mobs)]|Eval:[game_evaluation]"
+	msg = "P:[length(ai_mobs)]"
 	return ..()
 
 /datum/admins/proc/toggle_ai()
@@ -39,7 +37,7 @@ SUBSYSTEM_DEF(xeno_ai)
 		var/mob/living/carbon/xenomorph/M = current_run[current_run.len]
 		current_run.len--
 		if(!QDELETED(M) && !M.client && M.stat != DEAD)
-			M.process_ai(wait * 0.1, game_evaluation)
+			M.process_ai(wait * 0.1)
 		else
 			remove_ai(M)
 

code/modules/mob/living/carbon/xenomorph/abilities/general_abilities.dm

@@ -219,6 +219,31 @@
 	var/list/pounce_callbacks = null // Specific callbacks to invoke when a pounce lands on an atom of a specific type
 										// (note that if a collided atom does not match any of the key types, defaults to the appropriate X_launch_collision proc)
 
+	default_ai_action = TRUE
+	var/prob_chance = 80
+
+/datum/action/xeno_action/activable/pounce/process_ai(mob/living/carbon/xenomorph/pouncing_xeno, delta_time)
+	if(get_dist(pouncing_xeno, pouncing_xeno.current_target) > distance || !DT_PROB(prob_chance, delta_time))
+		return
+
+	var/turf/last_turf = pouncing_xeno.loc
+	var/clear = TRUE
+
+	pouncing_xeno.add_temp_pass_flags(PASS_OVER_THROW_MOB)
+
+	for(var/i in getline2(pouncing_xeno, pouncing_xeno.current_target, FALSE))
+		var/turf/new_turf = i
+		if(LinkBlocked(pouncing_xeno, last_turf, new_turf, list(pouncing_xeno.current_target, pouncing_xeno)))
+			clear = FALSE
+			break
+
+	pouncing_xeno.remove_temp_pass_flags(PASS_OVER_THROW_MOB)
+
+	if(!clear)
+		return
+
+	use_ability_async(pouncing_xeno.current_target)
+
 /datum/action/xeno_action/activable/pounce/New()
 	. = ..()
 	initialize_pounce_pass_flags()

code/modules/mob/living/carbon/xenomorph/abilities/runner/runner_abilities.dm

@@ -5,7 +5,7 @@
 	macro_path = /datum/action/xeno_action/verb/verb_pounce
 	action_type = XENO_ACTION_CLICK
 	ability_primacy = XENO_PRIMARY_ACTION_1
-	xeno_cooldown = 30
+	xeno_cooldown = 50
 	plasma_cost = 0
 
 	// Config options

code/modules/mob/living/carbon/xenomorph/abilities/xeno_action.dm

@@ -7,6 +7,9 @@
 	var/action_type = XENO_ACTION_CLICK // Determines how macros interact with this action. Defines are in xeno.dm in the defines folder.
 	var/ability_primacy = XENO_NOT_PRIMARY_ACTION // Determines how the default ability macros handle this.
 
+	/// Whether this action gets added to AI xenos
+	var/default_ai_action = FALSE
+
 	// Cooldown
 	/// Cooldown of the ability (do not use the cooldown var)
 	/// Probably should only have the cooldown var, but that is for another rework
@@ -58,6 +61,11 @@
 		action.update_button_icon()
 	return TRUE
 
+/// Used for AI xenos to prevent them from sleeping
+/datum/action/xeno_action/proc/use_ability_async(atom/A)
+	set waitfor = FALSE
+	use_ability(A)
+
 // Track statistics for this ability
 /datum/action/xeno_action/proc/track_xeno_ability_stats()
 	if(!owner)
@@ -74,10 +82,19 @@
 	if(X && !X.is_mob_incapacitated() && !X.dazed && !X.lying && !X.buckled && X.plasma_stored >= plasma_cost)
 		return TRUE
 
-/datum/action/xeno_action/give_to(mob/living/L)
+/datum/action/xeno_action/give_to(mob/living/living_mob)
 	..()
+
 	if(macro_path)
-		add_verb(L, macro_path)
+		add_verb(living_mob, macro_path)
+
+	if(!istype(living_mob, /mob/living/carbon/xenomorph))
+		return
+
+	var/mob/living/carbon/xenomorph/xeno_mob = living_mob
+
+	if(default_ai_action)
+		xeno_mob.register_ai_action(src)
 
 /datum/action/xeno_action/update_button_icon()
 	if(!button)
@@ -92,7 +109,7 @@
 	else
 		button.color = rgb(255,255,255,255)
 
-/datum/action/xeno_action/proc/process_ai(mob/living/carbon/xenomorph/X, delta_time, game_evaluation)
+/datum/action/xeno_action/proc/process_ai(mob/living/carbon/xenomorph/X, delta_time)
 	SHOULD_NOT_SLEEP(TRUE)
 	return PROCESS_KILL
 

code/modules/mob/living/carbon/xenomorph/ai/movement/base_define.dm

@@ -19,7 +19,7 @@
 	parent = null
 	return ..()
 
-/datum/xeno_ai_movement/proc/ai_move_idle(delta_time, game_evaluation)
+/datum/xeno_ai_movement/proc/ai_move_idle(delta_time)
 	SHOULD_NOT_SLEEP(TRUE)
 	var/mob/living/carbon/xenomorph/idle_xeno = parent
 	if(idle_xeno.throwing)
@@ -47,7 +47,7 @@
 	else
 		home_turf = null
 
-/datum/xeno_ai_movement/proc/ai_move_target(delta_time, game_evaluation)
+/datum/xeno_ai_movement/proc/ai_move_target(delta_time)
 	SHOULD_NOT_SLEEP(TRUE)
 	var/mob/living/carbon/xenomorph/X = parent
 	if(X.throwing)

code/modules/mob/living/carbon/xenomorph/ai/movement/drone.dm

@@ -9,7 +9,7 @@
 	blacklisted_turfs = null
 
 //drones expand the hive
-/datum/xeno_ai_movement/drone/ai_move_idle(delta_time, game_evaluation)
+/datum/xeno_ai_movement/drone/ai_move_idle(delta_time)
 	var/mob/living/carbon/xenomorph/idle_xeno = parent
 
 	if(idle_xeno.throwing)

code/modules/mob/living/carbon/xenomorph/ai/movement/linger.dm

@@ -0,0 +1,56 @@
+/datum/xeno_ai_movement/linger
+
+	/// The turf the xeno is currently attempting to travel to
+	var/turf/travelling_turf
+
+	/// Distance in turfs that the xeno will try to run to when the marine is not incapacitated or out of view
+	var/linger_range = 5
+
+	/// The deviation in turfs of linger_range, gives the bounds a + and - of upper and inner range
+	var/linger_deviation = 1
+
+	/// The cooldown for how long the xeno will wait out of view before attempting to re-engage
+	COOLDOWN_DECLARE(reengage_cooldown)
+
+/datum/xeno_ai_movement/linger/ai_move_target(delta_time)
+	var/mob/living/carbon/xenomorph/moving_xeno = parent
+	if(moving_xeno.throwing)
+		return
+
+	if(moving_xeno.current_target.is_mob_incapacitated())
+		return ..()
+
+	check_for_travelling_turf_change(moving_xeno)
+
+	if(!moving_xeno.move_to_next_turf(travelling_turf))
+		travelling_turf = get_turf(moving_xeno.current_target)
+		return TRUE
+
+#define REENGAGE_COOLDOWN (2 SECONDS)
+#define FIND_NEW_TRAVEL_TURF_LIMIT 5
+
+/datum/xeno_ai_movement/linger/proc/check_for_travelling_turf_change(mob/living/carbon/xenomorph/moving_xeno)
+	if(!(moving_xeno in view(world.view, moving_xeno.current_target)) && COOLDOWN_FINISHED(src, reengage_cooldown))
+		travelling_turf = get_turf(moving_xeno.current_target)
+		COOLDOWN_START(src, reengage_cooldown, REENGAGE_COOLDOWN)
+		return
+
+	if(!travelling_turf || get_dist(travelling_turf, moving_xeno) <= 0)
+		for(var/i = 0 to FIND_NEW_TRAVEL_TURF_LIMIT)
+			travelling_turf = get_random_turf_in_range_unblocked(moving_xeno.current_target, linger_range + linger_deviation, linger_range - linger_deviation)
+
+			if(!travelling_turf)
+				continue
+
+			var/travelling_turf_dir = get_dir(moving_xeno, travelling_turf)
+			var/current_target_dir = get_dir(moving_xeno, moving_xeno.current_target)
+
+			if(current_target_dir != travelling_turf_dir && current_target_dir != turn(travelling_turf_dir, 45) && current_target_dir != turn(travelling_turf_dir, -45))
+				break
+
+	if(!travelling_turf)
+		travelling_turf = get_turf(moving_xeno.current_target)
+		return
+
+#undef REENGAGE_COOLDOWN
+#undef FIND_NEW_TRAVEL_TURF_LIMIT

code/modules/mob/living/carbon/xenomorph/ai/xeno_ai.dm

@@ -50,7 +50,7 @@ GLOBAL_LIST_INIT(ai_target_limbs, list(
 	registered_ai_abilities -= XA
 	XA.ai_unregistered(src)
 
-/mob/living/carbon/xenomorph/proc/process_ai(delta_time, game_evaluation)
+/mob/living/carbon/xenomorph/proc/process_ai(delta_time)
 	SHOULD_NOT_SLEEP(TRUE)
 	SHOULD_CALL_PARENT(TRUE)
 	if(!hive || !get_turf(src))
@@ -72,10 +72,10 @@ GLOBAL_LIST_INIT(ai_target_limbs, list(
 	a_intent = INTENT_HARM
 
 	if(!current_target)
-		ai_move_idle(delta_time, game_evaluation)
+		ai_move_idle(delta_time)
 		return TRUE
 
-	if(ai_move_target(delta_time, game_evaluation))
+	if(ai_move_target(delta_time))
 		return TRUE
 
 	for(var/x in registered_ai_abilities)
@@ -87,23 +87,23 @@ GLOBAL_LIST_INIT(ai_target_limbs, list(
 		if(XA.hidden)
 			continue
 
-		if(XA.process_ai(src, delta_time, game_evaluation) == PROCESS_KILL)
+		if(XA.process_ai(src, delta_time) == PROCESS_KILL)
 			unregister_ai_action(XA)
 
 	if(get_dist(src, current_target) <= 1 && DT_PROB(XENO_SLASH, delta_time))
-		INVOKE_ASYNC(src, TYPE_PROC_REF(/mob, do_click), current_target, "", list())
+		INVOKE_ASYNC(src, PROC_REF(do_click), current_target, "", list())
 
 /** Controls movement when idle. Called by process_ai */
-/mob/living/carbon/xenomorph/proc/ai_move_idle(delta_time, game_evaluation)
+/mob/living/carbon/xenomorph/proc/ai_move_idle(delta_time)
 	if(!ai_movement_handler)
 		CRASH("No valid movement handler for [src]!")
-	ai_movement_handler.ai_move_idle(delta_time, game_evaluation)
+	ai_movement_handler.ai_move_idle(delta_time)
 
 /** Controls movement towards target. Called by process_ai */
-/mob/living/carbon/xenomorph/proc/ai_move_target(delta_time, game_evaluation)
+/mob/living/carbon/xenomorph/proc/ai_move_target(delta_time)
 	if(!ai_movement_handler)
 		CRASH("No valid movement handler for [src]!")
-	return ai_movement_handler.ai_move_target(delta_time, game_evaluation)
+	return ai_movement_handler.ai_move_target(delta_time)
 
 /atom/proc/xeno_ai_obstacle(mob/living/carbon/xenomorph/X, direction)
 	return INFINITY
@@ -126,7 +126,6 @@ GLOBAL_LIST_INIT(ai_target_limbs, list(
 		next_move_slowdown = 0
 	return TRUE
 
-
 /mob/living/carbon/xenomorph/proc/set_path(list/path)
 	current_path = path
 	if(!path)

code/modules/mob/living/carbon/xenomorph/castes/Runner.dm

@@ -67,12 +67,68 @@
 	icon_xeno = 'icons/mob/xenos/runner.dmi'
 	icon_xenonid = 'icons/mob/xenonids/runner.dmi'
 
+	var/linger_range = 5
+	var/linger_deviation = 1
+	var/pull_direction
 
 /mob/living/carbon/xenomorph/runner/initialize_pass_flags(datum/pass_flags_container/PF)
 	..()
 	if (PF)
 		PF.flags_pass |= PASS_FLAGS_CRAWLER
 
+/mob/living/carbon/xenomorph/runner/launch_towards(datum/launch_metadata/LM)
+	if(!current_target)
+		return ..()
+
+	pull_direction = turn(get_dir(src, current_target), 180)
+
+	if(!(pull_direction in GLOB.cardinals))
+		if(abs(x - current_target.x) < abs(y - current_target.y))
+			pull_direction &= (NORTH|SOUTH)
+		else
+			pull_direction &= (EAST|WEST)
+	return ..()
+
+/mob/living/carbon/xenomorph/runner/init_movement_handler()
+	var/datum/xeno_ai_movement/linger/linger_movement = new(src)
+	linger_movement.linger_range = linger_range
+	linger_movement.linger_deviation = linger_deviation
+	return linger_movement
+
+/mob/living/carbon/xenomorph/runner/ai_move_target(delta_time)
+	if(throwing)
+		return
+
+	if(pulling)
+		if(can_move_and_apply_move_delay())
+			if(!Move(get_step(loc, pull_direction), pull_direction))
+				pull_direction = turn(pull_direction, pick(45, -45))
+		current_path = null
+		return
+
+	..()
+
+	if(get_dist(current_target, src) > 1)
+		return
+
+	if(!current_target.is_mob_incapacitated())
+		return
+
+	if(isxeno(current_target.pulledby))
+		return
+
+	if(!DT_PROB(RUNNER_GRAB, delta_time))
+		return
+
+	INVOKE_ASYNC(src, PROC_REF(start_pulling), current_target)
+	swap_hand()
+
+/mob/living/carbon/xenomorph/runner/process_ai(delta_time)
+	if(get_active_hand())
+		swap_hand()
+	zone_selected = pick(GLOB.ai_target_limbs)
+	return ..()
+
 /datum/behavior_delegate/runner_base
 	name = "Base Runner Behavior Delegate"
 

code/modules/mob/mob.dm

@@ -472,7 +472,7 @@
 	if(istype(AM, /atom/movable/clone))
 		AM = AM.mstr //If AM is a clone, refer to the real target
 
-	if ( QDELETED(AM) || !usr || src==AM || !isturf(loc) || !isturf(AM.loc) ) //if there's no person pulling OR the person is pulling themself OR the object being pulled is inside something: abort!
+	if (QDELETED(AM) || src == AM || !isturf(loc) || !isturf(AM.loc)) //if there's no person pulling OR the person is pulling themself OR the object being pulled is inside something: abort!
 		return
 
 	if (AM.anchored || AM.throwing)

colonialmarines.dme

@@ -1949,6 +1949,7 @@ s// DM Environment file for colonialmarines.dme.
 #include "code\modules\mob\living\carbon\xenomorph\ai\xeno_ai.dm"
 #include "code\modules\mob\living\carbon\xenomorph\ai\movement\base_define.dm"
 #include "code\modules\mob\living\carbon\xenomorph\ai\movement\drone.dm"
+#include "code\modules\mob\living\carbon\xenomorph\ai\movement\linger.dm"
 #include "code\modules\mob\living\carbon\xenomorph\castes\Boiler.dm"
 #include "code\modules\mob\living\carbon\xenomorph\castes\Burrower.dm"
 #include "code\modules\mob\living\carbon\xenomorph\castes\Carrier.dm"