add basic airtank code

code/modules/mob/airhack.dm

@@ -0,0 +1,113 @@
+/mob
+	var/datum/gas_mixture/air_contents = new
+
+	var/obj/machinery/atmospherics/portables_connector/connected_port
+	var/obj/item/weapon/tank/holding
+
+	var/volume = 1000
+	var/destroyed = 0
+
+	var/start_pressure = ONE_ATMOSPHERE
+	var/maximum_pressure = 90 * ONE_ATMOSPHERE
+/mob/New()
+	..()
+
+	air_contents.volume = volume
+	air_contents.temperature = T20C
+
+	return 1
+/mob/Destroy()
+	qdel_null(air_contents)
+	qdel_null(holding)
+	. = ..()
+/mob/Life()
+	if(!connected_port) //only react when pipe_network will ont it do it for you
+		//Allow for reactions
+		air_contents.react()
+	. = ..()
+/mob/proc/StandardAirMix()
+	return list(
+		"oxygen" = O2STANDARD * MolesForPressure(),
+		"nitrogen" = N2STANDARD *  MolesForPressure())
+/mob/proc/MolesForPressure(var/target_pressure = start_pressure)
+	return (target_pressure * air_contents.volume) / (R_IDEAL_GAS_EQUATION * air_contents.temperature)
+
+/mob/proc/connect(obj/machinery/atmospherics/portables_connector/new_port)
+	//Make sure not already connected to something else
+	if(connected_port || !new_port || new_port.connected_device)
+		return 0
+
+	//Make sure are close enough for a valid connection
+	if(new_port.loc != loc)
+		return 0
+
+	//Perform the connection
+	connected_port = new_port
+	connected_port.connected_device = src
+	connected_port.on = 1 //Activate port updates
+
+	anchored = 1 //Prevent movement
+
+	//Actually enforce the air sharing
+	var/datum/pipe_network/network = connected_port.return_network(src)
+	if(network && !network.gases.Find(air_contents))
+		network.gases += air_contents
+		network.update = 1
+
+	return 1
+
+/mob/proc/disconnect()
+	if(!connected_port)
+		return 0
+
+	var/datum/pipe_network/network = connected_port.return_network(src)
+	if(network)
+		network.gases -= air_contents
+
+	anchored = 0
+
+	connected_port.connected_device = null
+	connected_port = null
+
+	return 1
+
+/mob/proc/update_connected_network()
+	if(!connected_port)
+		return
+
+	var/datum/pipe_network/network = connected_port.return_network(src)
+	if (network)
+		network.update = 1
+
+/mob/proc/Airattackby(var/obj/item/weapon/W as obj, var/mob/user as mob)
+	if (istype(W, /obj/item/weapon/wrench))
+		if(connected_port)
+			disconnect()
+			user << "<span class='notice'>You disconnect \the [src] from the port.</span>"
+			update_icon()
+			playsound(src, W.usesound, 50, 1)
+			return 1
+		else
+			var/obj/machinery/atmospherics/portables_connector/possible_port = locate(/obj/machinery/atmospherics/portables_connector/) in loc
+			if(possible_port)
+				if(connect(possible_port))
+					user << "<span class='notice'>You connect \the [src] to the port.</span>"
+					update_icon()
+					playsound(src, W.usesound, 50, 1)
+					return
+				else
+					user << "<span class='notice'>\The [src] failed to connect to the port.</span>"
+					return
+			else
+				user << "<span class='notice'>Nothing happens.</span>"
+				return 1
+
+	else if ((istype(W, /obj/item/device/analyzer)) && Adjacent(user))
+		var/obj/item/device/analyzer/A = W
+		A.analyze_gases(src, user)
+		return 1
+	return 0
+
+/mob/living/hit_with_weapon(obj/item/I, mob/living/user, var/effective_force, var/hit_zone)
+	user.Airattackby(I,src)
+	..(I,user,effective_force,hit_zone)