adds a zero-pressure gun for mining

code/modules/projectiles/guns/energy/particle.dm

@@ -0,0 +1,87 @@
+/obj/item/weapon/gun/energy/particle
+	name = "Antiparticle projector gun"
+	icon = 'icons/obj/gun_vr.dmi'
+	icon_state = "particle"
+	item_state = "particle"
+	desc = "An unconventional firearm, APP guns generate attogram-scale quantities of antimatter which are then launched using an electromagnetic field."
+	force = 5
+	fire_sound = 'sound/weapons/Laser.ogg'
+	slot_flags = SLOT_BELT
+	w_class = ITEMSIZE_NORMAL
+	projectile_type = /obj/item/projectile/bullet/particle
+	origin_tech = null
+	fire_delay = 10
+	charge_cost = 240	//same cost as lasers
+	var/safetycatch = 0 //if 1, won't let you fire in pressurised environment, rather than malfunctioning
+
+
+/obj/item/weapon/gun/energy/particle/special_check(var/mob/user)
+	if (..())
+		var/turf/T = get_turf(src)
+		var/datum/gas_mixture/environment = T ? T.return_air() : null
+		var/pressure =  environment ? environment.return_pressure() : 0
+
+		if (!power_supply || power_supply.charge < charge_cost)
+			user.visible_message("<span class='warning'>*click*</span>", "<span class='danger'>*click*</span>")
+			playsound(src.loc, 'sound/weapons/empty.ogg', 100, 1)
+			return 0
+		if(pressure >= 10)
+			if (safetycatch) //weapons with a pressure regulator simply won't fire
+				user.visible_message("<span class='warning'>*click*</span>", "<span class='danger'>The pressure-interlock prevents you from firing \the [src].</span>")
+				playsound(src.loc, 'sound/weapons/empty.ogg', 100, 1)
+				return 0
+			else if (prob(min(pressure, 100))) //pressure% chance of failing
+				var/severity = rand(pressure)
+				if (severity <= 10) // just doesn't fire. 10% chance in 100 atmo.
+					user.visible_message("<span class='warning'>*click*</span>", "<span class='danger'>\The [src] jams.</span>")
+					playsound(src.loc, 'sound/weapons/empty.ogg', 100, 1)
+				else if (severity <= 60) //50% chance of fizzling and wasting a shot
+					user.visible_message("<span class='warning'>\The [user] fires \the [src], but the shot fizzles in the air!</span>", "<span class='danger'>You fire \the [src], but the shot fizzles in the air!</span>")
+					power_supply.charge -= charge_cost
+					playsound(src.loc, fire_sound, 100, 1)
+					var/datum/effect/effect/system/spark_spread/sparks = PoolOrNew(/datum/effect/effect/system/spark_spread)
+					sparks.set_up(2, 1, T)
+					sparks.start()
+					update_icon()
+				else if (severity <= 80) //20% chance of shorting out and emptying the cell
+					user.visible_message("<span class='warning'>\The [user] pulls the trigger, but \the [src] shorts out!</span>", "<span class='danger'>You pull the trigger, but \the [src] shorts out!</span>")
+					power_supply.charge = 0
+					var/datum/effect/effect/system/spark_spread/sparks = PoolOrNew(/datum/effect/effect/system/spark_spread)
+					sparks.set_up(2, 1, T)
+					sparks.start()
+					update_icon()
+				else if (severity <= 90) //10% chance of breaking the gun
+					user.visible_message("<span class='warning'>\The [user] pulls the trigger, but \the [src] erupts in a shower of sparks!</span>", "<span class='danger'>You pull the trigger, but \the [src] bursts into a shower of sparks!</span>")
+					var/datum/effect/effect/system/spark_spread/sparks = PoolOrNew(/datum/effect/effect/system/spark_spread)
+					sparks.set_up(2, 1, T)
+					sparks.start()
+					power_supply.charge = 0
+					power_supply.maxcharge = 0
+					power_supply.desc += " It seems to be burnt out!"
+					desc += " The casing is covered in scorch-marks."
+					fire_delay += fire_delay // even if you swap out the cell for a good one, the gun's cluckety-clucked.
+					charge_cost += charge_cost
+					update_icon()
+				else if (severity <= 150) // 10% chance of exploding
+					user << "<span class='danger'>The [src] explodes!</span>"
+					explosion(T, -1, -1, 1, 1)
+					qdel(src)
+				else //can only possibly happen if you're dumb enough to fire it in an OVER pressure environment, over 150kPa
+					user << "<span class='danger'>The [src] explodes catastrophically!</span>"
+					explosion(T, -1, 1, 2, 2)
+					qdel(src)
+				return 0
+		return 1
+	return 0
+
+
+// projectiles below
+
+/obj/item/projectile/bullet/particle
+	name = "particle"
+	icon = 'icons/obj/projectiles_vr.dmi'
+	icon_state = "particle"
+	damage = 40
+	damage_type = BURN
+	check_armour = "energy"
+	embed_chance = 0