[MIRROR] Ventcrawler update (#11930)

Co-authored-by: Will <7099514+Willburd@users.noreply.github.com>

code/ATMOSPHERICS/atmospherics.dm

@@ -260,3 +260,22 @@ Pipelines + Other Objects -> Pipe network
 	if(user.buckled)
 		user.buckled.unbuckle_mob(user, TRUE)
 	user.throw_at(get_edge_target_turf(user, get_dir(src, user) || pick(GLOB.cardinal)), pressures / 250, pressures / 1250)
+
+/// Blows out a pipe, deconstructing it, breaking the floor and releasing all mobs crawling inside it
+/obj/machinery/atmospherics/proc/blowout(mob/user)
+	// Deconstruct turf
+	var/turf/our_turf = loc
+	if(!our_turf.is_plating() && istype(our_turf,/turf/simulated/floor)) //intact floor, pop the tile
+		var/turf/simulated/floor/our_floor = our_turf
+		our_floor.make_plating(TRUE)
+	// Deconstruct pipe
+	var/datum/gas_mixture/int_air = return_air()
+	var/datum/gas_mixture/env_air = our_turf.return_air()
+	var/internal_pressure = int_air.return_pressure()-env_air.return_pressure()
+	deconstruct()
+	// Release pressure
+	playsound(our_turf, 'sound/effects/bang.ogg', 70, 0, 0)
+	playsound(our_turf, 'sound/effects/clang2.ogg', 70, 0, 0)
+	if(internal_pressure > 2*ONE_ATMOSPHERE)
+		unsafe_pressure_release(user, internal_pressure)
+		playsound(our_turf, 'sound/machines/hiss.ogg', 50, 0, 0)

code/ATMOSPHERICS/components/unary/unary_base.dm

@@ -11,7 +11,7 @@
 
 	var/datum/pipe_network/network
 
-	var/welded = 0 //defining this here for ventcrawl stuff
+	var/welded = FALSE //defining this here for ventcrawl stuff
 
 /obj/machinery/atmospherics/unary/Initialize(mapload)
 	. = ..()

code/ATMOSPHERICS/components/unary/vent_scrubber.dm

@@ -68,7 +68,9 @@
 	if(!istype(T))
 		return
 
-	if(!powered())
+	if(welded)
+		scrubber_icon += "weld"
+	else if(!powered())
 		scrubber_icon += "off"
 	else
 		scrubber_icon += "[use_power ? "[scrubbing ? "on" : "in"]" : "off"]"
@@ -269,6 +271,27 @@
 		update_icon()
 
 /obj/machinery/atmospherics/unary/vent_scrubber/attackby(var/obj/item/W as obj, var/mob/user as mob)
+	if(W.has_tool_quality(TOOL_WELDER))
+		var/obj/item/weldingtool/WT = W
+		if (WT.remove_fuel(0,user))
+			to_chat(user, span_notice("Now welding the vent."))
+
+			if(do_after(user, 20 * WT.toolspeed))
+				if(!src || !WT.isOn()) return
+				playsound(src, WT.usesound, 50, 1)
+				if(!welded)
+					user.visible_message(span_notice("<b>\The [user]</b> welds the vent shut."), span_notice("You weld the vent shut."), "You hear welding.")
+					welded = TRUE
+					update_icon()
+				else
+					user.visible_message(span_notice("[user] unwelds the vent."), span_notice("You unweld the vent."), "You hear welding.")
+					welded = FALSE
+					update_icon()
+			else
+				to_chat(user, span_notice("The welding tool needs to be on to start this task."))
+		else
+			to_chat(user, span_warning("You need more welding fuel to complete this task."))
+			return 1
 	if (!W.has_tool_quality(TOOL_WRENCH))
 		return ..()
 	if (!(stat & NOPOWER) && use_power)
@@ -278,6 +301,9 @@
 	if (node && node.level==1 && isturf(T) && !T.is_plating())
 		to_chat(user, span_warning("You must remove the plating first."))
 		return 1
+	if(welded)
+		to_chat(user, span_warning("You cannot unwrench \the [src], it is welded down firmly."))
+		return 1
 	if(!can_unwrench())
 		to_chat(user, span_warning("You cannot unwrench \the [src], it is too exerted due to internal pressure."))
 		add_fingerprint(user)
@@ -297,3 +323,5 @@
 		. += "A small gauge in the corner reads [round(last_flow_rate, 0.1)] L/s; [round(last_power_draw)] W"
 	else
 		. += "You are too far away to read the gauge."
+	if(welded)
+		. += "It is welded shut."