isopenturf() macro, update_above improvements (#2931)

changes:

Added a isopenturf() macro, equivalent to istype(thing, /turf/simulated/open).
Converted most/all instances of istype(/turf/simulated/open) to isopenturf().
Made update_above()' aware of queue status & inlined a proc-call.

code/modules/admin/verbs/mapping.dm

@@ -425,7 +425,7 @@ var/global/movement_disabled_exception //This is the client that calls the proc,
 
 	for(var/obj/machinery/door/airlock/A in machines)
 		var/turf/T = get_turf(A)
-		if(istype(T, /turf/space) || istype(T, /turf/simulated/floor/asteroid) || istype(T, /turf/simulated/open) || T.density)
+		if(istype(T, /turf/space) || istype(T, /turf/simulated/floor/asteroid) || isopenturf(T) || T.density)
 			usr << "Airlock [A] with bad turf at ([A.x],[A.y],[A.z]) in [T.loc]."
 
 /client/proc/get_bad_fdoors()

code/modules/clothing/spacesuits/rig/modules/utility.dm

@@ -590,7 +590,7 @@
 				return 0
 
 		var/turf/leapEnd = get_step(TA, H.dir)
-		if (!leapEnd || istype(leapEnd, /turf/simulated/open) || istype(leapEnd, /turf/space)\
+		if (!leapEnd || isopenturf(leapEnd) || istype(leapEnd, /turf/space)\
 			|| leapEnd.density || leapEnd.contains_dense_objects())
 			to_chat(H, "<span class='warning'>There is no valid ledge to scale ahead of you!</span>")
 			return 0

code/modules/lighting/lighting_source.dm

@@ -342,7 +342,7 @@
 
 		turfs += T
 
-		if (istype(T, /turf/simulated/open) && T:below)
+		if (isopenturf(T) && T:below)
 			T = T:below	// Consider the turf below us as well. (Z-lights)
 			goto check_t
 

code/modules/lighting/lighting_source_novis.dm

@@ -76,7 +76,7 @@
 
 		CHECK_TICK
 
-		if (istype(T, /turf/simulated/open) && T:below)
+		if (isopenturf(T) && T:below)
 			T = T:below
 			goto check_t
 

code/modules/multiz/mobile_ladders.dm

@@ -12,7 +12,7 @@
 
 /obj/item/weapon/ladder_mobile/proc/place_ladder(atom/A, mob/user)
 
-	if (istype(A, /turf/simulated/open))         //Place into open space
+	if (isopenturf(A))         //Place into open space
 		var/turf/below_loc = GetBelow(A)
 		if (!below_loc || (istype(/turf/space, below_loc)))
 			to_chat(user, "<span class='notice'>Why would you do that?! There is only infinite space there...</span>")
@@ -33,7 +33,7 @@
 
 	else if (istype(A, /turf/simulated/floor))        //Place onto Floor
 		var/turf/upper_loc = GetAbove(A)
-		if (!upper_loc || !istype(upper_loc,/turf/simulated/open))
+		if (!upper_loc || !isopenturf(upper_loc))
 			user << "<span class='notice'>There is something above. You can't deploy!</span>"
 			return
 		user.visible_message("<span class='warning'>[user] begins deploying \the [src] on \the [A].</span>",

code/modules/multiz/openspace.dm

@@ -7,7 +7,7 @@
 
 /turf/Entered(atom/movable/thing, atom/oldLoc)
 	. = ..()
-	if (above && !thing.no_z_overlay && !thing.bound_overlay && !istype(oldLoc, /turf/simulated/open))
+	if (above && !thing.no_z_overlay && !thing.bound_overlay && !isopenturf(oldLoc))
 		above.update_icon()
 
 /turf/Destroy()
@@ -43,8 +43,11 @@
 		return
 
 	// check_existence returns TRUE if the overlay is valid.
-	if (bound_overlay.check_existence() && !bound_overlay.queued)
+	if (isopenturf(bound_overlay.loc) && !bound_overlay.queued)
 		SSopenturf.queued_overlays += bound_overlay
+		bound_overlay.queued = TRUE
+	else
+		qdel(bound_overlay)
 
 /atom/movable/proc/get_above_oo()
 	. = list()
@@ -136,22 +139,13 @@
 
 /atom/movable/openspace/overlay/forceMove(atom/dest)
 	. = ..()
-	if (istype(dest, /turf/simulated/open))
+	if (isopenturf(dest))
 		if (destruction_timer)
 			deltimer(destruction_timer)
 			destruction_timer = null
 	else if (!destruction_timer)
 		destruction_timer = addtimer(CALLBACK(GLOBAL_PROC, /proc/qdel, src), 10 SECONDS, TIMER_STOPPABLE)
 
-// Checks if we've moved off of an openturf.
-// Returns TRUE if we're continuing to exist, FALSE if we're deleting ourselves.
-/atom/movable/openspace/overlay/proc/check_existence()
-	if (!istype(loc, /turf/simulated/open))
-		qdel(src)
-		return FALSE
-	else
-		return TRUE
-
 // Called when the turf we're on is deleted/changed.
 /atom/movable/openspace/overlay/proc/owning_turf_changed()
 	if (!destruction_timer)

code/modules/power/cable.dm

@@ -666,7 +666,7 @@ obj/structure/cable/proc/cableColor(var/colorC)
 				return
 ///// Z-Level Stuff
 		// check if the target is open space
-		if(istype(F, /turf/simulated/open))
+		if(isopenturf(F))
 			for(var/obj/structure/cable/LC in F)
 				if((LC.d1 == dirn && LC.d2 == 11 ) || ( LC.d2 == dirn && LC.d1 == 11))
 					user << "<span class='warning'>There's already a cable at that position.</span>"