Door rigging tool (#18899)

Added a door rigging tool, it allows you to mine a door, so that when it
opens, it explodes. Requires the door to be welded shut first.
Added a box and antag uplink item for the above.

---------

Signed-off-by: Fluffy <65877598+FluffyGhoster@users.noreply.github.com>
Co-authored-by: Geeves <ggrobler447@gmail.com>

code/datums/uplink/stealthy and inconspicuous weapons.dm

@@ -62,6 +62,13 @@
 	telecrystal_cost = 5
 	path = /obj/item/storage/box/landmines/standstill
 
+/datum/uplink_item/item/stealthy_weapons/door_rigging_landmines
+	name = "Door Rigging Landmines"
+	desc = "A box with 5 door rigging landmines, which will explode when the door they are attached to opens. \
+			You need to weld the door closed to use this, so do not forget to have a welder and probably some welding goggles with you."
+	telecrystal_cost = 5
+	path = /obj/item/storage/box/landmines/door_rigging
+
 /datum/uplink_item/item/stealthy_weapons/claymore_mines
 	name = "Claymore Mines"
 	desc = "A box with 5 claymore miners, relative detonators (signalers), and a spare one for you to trigger them all."

code/game/objects/items/weapons/landmines.dm

@@ -196,6 +196,69 @@
 	fragem(src,num_fragments,num_fragments,explosion_size,explosion_size+1,fragment_damage,damage_step,TRUE)
 	qdel(src)
 
+/**
+ * # Door Rigging Landmine
+ *
+ * A landmine that will explode when the door it is attached to opens
+ */
+/obj/item/landmine/frag/door_rigging
+	name = "door rigging landmine"
+	fragment_damage = 20
+
+	///The airlock that we are observing for when it opens, to explode
+	var/obj/machinery/door/airlock/door_rigged
+
+//Prevent this mine to be used like a normal one
+/obj/item/landmine/frag/door_rigging/attack_self(mob/user)
+	to_chat(user, SPAN_ALERT("This landmine is not usable in this way, you need to apply it to a door."))
+	return
+
+/obj/item/landmine/frag/door_rigging/resolve_attackby(atom/A, mob/user, click_parameters)
+	. = ..()
+
+	if(istype(A, /obj/machinery/door/airlock))
+
+		door_rigged = A
+		var/turf/turf_under_door = get_turf(door_rigged)
+
+		//Prevent people from exploding themselves by targeting a door that will open once clicked
+		if(!door_rigged.welded || !door_rigged.density || !istype(turf_under_door) || locate(/obj/item/landmine) in turf_under_door)
+			to_chat(user, SPAN_WARNING("The door is not welded, is open, is already rigged or does not have a turf below it."))
+			door_rigged = null //Clean up the var
+			return
+
+		//Take a little to do this
+		if(!do_after(user, 10 SECONDS, door_rigged))
+			door_rigged = null
+			return
+
+		RegisterSignal(door_rigged, COMSIG_QDELETING, PROC_REF(handle_door_qdel))
+
+		deploy(user)
+		src.forceMove(turf_under_door)
+
+		activate(user)
+
+		START_PROCESSING(SSfast_process, src)
+
+/obj/item/landmine/frag/door_rigging/process(seconds_per_tick)
+	if(QDELETED(door_rigged))
+		STOP_PROCESSING(SSfast_process, src)
+		qdel(src)
+
+	if(!door_rigged.density)
+		STOP_PROCESSING(SSfast_process, src)
+		trigger(null)
+
+///Clear the reference and delete the mine if the door gets deleted
+/obj/item/landmine/frag/door_rigging/proc/handle_door_qdel()
+	SIGNAL_HANDLER
+
+	door_rigged = null
+	STOP_PROCESSING(SSfast_process, src)
+	qdel(src)
+
+
 /**
  * # Radiation Landmine
  *

code/game/objects/items/weapons/storage/boxes.dm

@@ -1276,6 +1276,11 @@
 	desc = "A box containing 5 standstill landmines."
 	starts_with = list(/obj/item/landmine/standstill = 5)
 
+/obj/item/storage/box/landmines/door_rigging
+	name = "box of door rigging landmines"
+	desc = "A box containing 5 door rigging landmines."
+	starts_with = list(/obj/item/landmine/frag/door_rigging = 5)
+
 /obj/item/storage/box/landmines/claymore
 	name = "box of claymore landmines"
 	desc = "A box containing 5 claymore landmines, relative detonators, and a spare one to trigger them all."

html/changelogs/fluffyghost-doorrigging.yml

@@ -0,0 +1,42 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#   admin
+#   backend
+#   security
+#   refactor
+#################################
+
+# Your name.
+author: FluffyGhost
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - rscadd: "Added a door rigging tool, it allows you to mine a door, so that when it opens, it explodes. Requires the door to be welded shut first."
+  - rscadd: "Added a box and antag uplink item for the above."