Adds AI ventcrawling code, does not implement it (#29661)

* bam

* push

* im trolling myself

* code

* ok lets go

* fix

* improvements

code/modules/atmospherics/machinery/atmospherics.dm

@@ -466,4 +466,7 @@ Pipelines + Other Objects -> Pipe network
 	if(user)
 		to_chat(user, "<span class='notice'>You set the target pressure of [src] to maximum.</span>")
 
+/obj/machinery/atmospherics/proc/get_machinery_pipelines()
+	return list()
+
 #undef VENT_SOUND_DELAY

code/modules/atmospherics/machinery/components/binary_devices/binary_atmos_base.dm

@@ -131,6 +131,9 @@
 	else if(A == node2)
 		return parent2
 
+/obj/machinery/atmospherics/binary/get_machinery_pipelines()
+	return list(parent1, parent2)
+
 /obj/machinery/atmospherics/binary/is_pipenet_split()
 	return TRUE
 

code/modules/atmospherics/machinery/components/trinary_devices/trinary_base.dm

@@ -182,8 +182,11 @@
 	else if(A == node3)
 		return parent3
 
+/obj/machinery/atmospherics/trinary/get_machinery_pipelines()
+	return list(parent1, parent2, parent3)
+
 /obj/machinery/atmospherics/trinary/is_pipenet_split()
-	return FALSE
+	return TRUE
 
 /obj/machinery/atmospherics/trinary/replacePipenet(datum/pipeline/Old, datum/pipeline/New)
 	if(Old == parent1)

code/modules/atmospherics/machinery/components/unary_devices/unary_base.dm

@@ -90,6 +90,9 @@
 /obj/machinery/atmospherics/unary/returnPipenet()
 	return parent
 
+/obj/machinery/atmospherics/unary/get_machinery_pipelines()
+	return parent
+
 /obj/machinery/atmospherics/unary/replacePipenet(datum/pipeline/Old, datum/pipeline/New)
 	if(Old == parent)
 		parent = New

code/modules/atmospherics/machinery/datum_pipeline.dm

@@ -231,3 +231,30 @@
 /datum/pipeline/proc/remove_ventcrawler(mob/living/crawler)
 	UnregisterSignal(crawler, COMSIG_LIVING_EXIT_VENTCRAWL)
 	crawlers -= crawler
+
+/**
+ * Gets all pipelines connected to this with valves, including src.
+ */
+/datum/pipeline/proc/get_connected_pipelines()
+	. = list()
+	var/list/possible_expansions = list(src)
+	while(length(possible_expansions))
+		var/datum/pipeline/P = popleft(possible_expansions)
+		if(!P)
+			break
+		. |= P
+		for(var/obj/machinery/atmospherics/V in P.other_atmosmch)
+			for(var/datum/pipeline/possible in V.get_machinery_pipelines())
+				if(possible in .)
+					continue
+				possible_expansions |= possible
+
+/datum/pipeline/proc/get_ventcrawls(check_welded = TRUE)
+	. = list()
+	for(var/datum/pipeline/P in get_connected_pipelines())
+		for(var/obj/machinery/atmospherics/V in P.other_atmosmch)
+			if(!is_type_in_list(V, GLOB.ventcrawl_machinery))
+				continue
+			if(check_welded && !V.can_crawl_through())
+				continue
+			. |= V

code/modules/mob/living/carbon/carbon_procs.dm

@@ -541,8 +541,6 @@ GLOBAL_LIST_INIT(ventcrawl_machinery, list(/obj/machinery/atmospherics/unary/ven
 	var/ventcrawl_delay = 0 SECONDS
 #else
 	var/ventcrawl_delay = 4.5 SECONDS
-	if(!client)
-		return
 #endif
 	if(ismorph(src))
 		if(!do_after(src, ventcrawl_delay, target = src, hidden = TRUE))