Returns old alien weeds (#4075)

This update returns the alien weeds to their old behavior, instead of just being regular vines that turns any alien round into a giant clusterfuck. Also fixes alien acid being unable to melt the floor.

code/game/objects/structures/alien/node.dm

@@ -1,19 +1,105 @@
-/obj/structure/alien/node
-	name = "alien weed node"
-	desc = "Some kind of strange, pulsating structure."
+#define NODERANGE 3
+
+/obj/structure/alien/weeds
+	name = "weeds"
+	desc = "Weird purple weeds."
+	icon_state = "weeds"
+	anchored = 1
+	density = 0
+	health = 15
+	var/obj/structure/alien/weeds/node/linked_node = null
+	var/list/dirs_left
+
+/obj/structure/alien/weeds/node
 	icon_state = "weednode"
-	health = 100
-	layer = 3.1
+	name = "purple sac"
+	desc = "Weird purple octopus-like thing."
+	light_range = NODERANGE
+	var/node_range = NODERANGE
 
-/obj/structure/alien/node/Initialize()
-	. = ..()
-	START_PROCESSING(SSprocessing, src)
-
-/obj/structure/alien/node/Destroy()
+/obj/structure/alien/weeds/Destroy()
 	STOP_PROCESSING(SSprocessing, src)
 	return ..()
 
-/obj/structure/alien/node/process()
-	if(locate(/obj/effect/plant) in loc)
-		return
-	new /obj/effect/plant(get_turf(src), SSplants.seeds["xenomorph"])
+/obj/structure/alien/weeds/Initialize(pos, node)
+	. = ..()
+	if(istype(loc, /turf/space))
+		return INITIALIZE_HINT_QDEL
+	linked_node = node
+	if(icon_state == "weeds")icon_state = pick("weeds", "weeds1", "weeds2")
+
+	START_PROCESSING(SSprocessing, src)
+
+	dirs_left = cardinal.Copy()
+
+/obj/structure/alien/weeds/process()
+	var/turf/U = get_turf(src)
+
+	if (istype(U, /turf/space))
+		qdel(src)
+		return PROCESS_KILL
+
+	if (!dirs_left.len || !linked_node || get_dist(linked_node, src) > linked_node.node_range)
+		return PROCESS_KILL
+
+	for (var/D in dirs_left)
+		var/turf/T = get_step(src, D)
+
+		if (!isturf(T) || T.is_hole || T.is_space() || locate(/obj/structure/alien/weeds, T))
+			dirs_left -= D
+			continue
+
+		if (T.density)
+			continue
+
+		var/spawn_new = TRUE
+		for (var/aa in T)
+			var/atom/A = aa
+			if (istype(/obj/structure/alien/weeds, A))
+				dirs_left -= D
+				spawn_new = FALSE
+				break
+
+			else if (A.density)
+				spawn_new = FALSE
+
+		if (spawn_new)
+			new /obj/structure/alien/weeds(T, linked_node)
+
+
+/obj/structure/alien/weeds/ex_act(severity)
+	switch(severity)
+		if(1.0)
+			qdel(src)
+		if(2.0)
+			if (prob(50))
+				qdel(src)
+		if(3.0)
+			if (prob(5))
+				qdel(src)
+	return
+
+/obj/structure/alien/weeds/attackby(var/obj/item/weapon/W, var/mob/user)
+	user.setClickCooldown(DEFAULT_ATTACK_COOLDOWN)
+
+	visible_message("<span class='danger'>\The [src] have been attacked with \the [W][(user ? " by [user]." : ".")]</span>")
+
+	var/damage = W.force / 4.0
+
+	if(iswelder(W))
+		var/obj/item/weapon/weldingtool/WT = W
+
+		if(WT.remove_fuel(0, user))
+			damage = 15
+			playsound(loc, 'sound/items/Welder.ogg', 100, 1)
+
+	health -= damage
+	healthcheck()
+
+
+/obj/structure/alien/weeds/fire_act(datum/gas_mixture/air, exposed_temperature, exposed_volume)
+	if(exposed_temperature > 300 + T0C)
+		health -= 5
+		healthcheck()
+
+#undef NODERANGE