Merge pull request #9380 from Ghommie/Ghommie_cit212

refactoring and fixing altdisarm() exploits (ergo pushing people over directional windows etc).

code/game/atoms.dm

@@ -252,6 +252,11 @@
 	SEND_SIGNAL(src, COMSIG_ATOM_BULLET_ACT, P, def_zone)
 	. = P.on_hit(src, 0, def_zone)
 
+//used on altdisarm() for special interactions between the shoved victim (target) and the src, with user being the one shoving the target on it.
+// IMPORTANT: if you wish to add a new own shove_act() to a certain object, remember to add SHOVABLE_ONTO to its obj_flags bitfied var first.
+/atom/proc/shove_act(mob/living/target, mob/living/user)
+	return FALSE
+
 /atom/proc/in_contents_of(container)//can take class or object instance as argument
 	if(ispath(container))
 		if(istype(src.loc, container))

code/game/objects/structures/tables_racks.dm

@@ -21,6 +21,7 @@
 	anchored = TRUE
 	layer = TABLE_LAYER
 	climbable = TRUE
+	obj_flags = CAN_BE_HIT|SHOVABLE_ONTO
 	pass_flags = LETPASSTHROW //You can throw objects over this, despite it's density.")
 	var/frame = /obj/structure/table_frame
 	var/framestack = /obj/item/stack/rods
@@ -136,6 +137,15 @@
 	var/mob/living/carbon/human/H = pushed_mob
 	SEND_SIGNAL(H, COMSIG_ADD_MOOD_EVENT, "table", /datum/mood_event/table)
 
+/obj/structure/table/shove_act(mob/living/target, mob/living/user)
+	if(!target.resting)
+		target.Knockdown(SHOVE_KNOCKDOWN_TABLE)
+	user.visible_message("<span class='danger'>[user.name] shoves [target.name] onto \the [src]!</span>",
+		"<span class='danger'>You shove [target.name] onto \the [src]!</span>", null, COMBAT_MESSAGE_RANGE)
+	target.forceMove(src.loc)
+	log_combat(user, target, "shoved", "onto [src] (table)")
+	return TRUE
+
 /obj/structure/table/attackby(obj/item/I, mob/user, params)
 	if(!(flags_1 & NODECONSTRUCT_1))
 		if(istype(I, /obj/item/screwdriver) && deconstruction_ready)

code/game/turfs/turf.dm

@@ -457,6 +457,19 @@
 		if(ismob(A) || .)
 			A.ratvar_act()
 
+//called on /datum/species/proc/altdisarm()
+/turf/shove_act(mob/living/target, mob/living/user, pre_act = FALSE)
+	var/list/possibilities
+	for(var/obj/O in contents)
+		if(CHECK_BITFIELD(O.obj_flags, SHOVABLE_ONTO))
+			LAZYADD(possibilities, O)
+		else if(!O.CanPass(target, src))
+			return FALSE
+	if(possibilities)
+		var/obj/O = pick(possibilities)
+		return O.shove_act(target, user)
+	return FALSE
+
 /turf/proc/get_smooth_underlay_icon(mutable_appearance/underlay_appearance, turf/asking_turf, adjacency_dir)
 	underlay_appearance.icon = icon
 	underlay_appearance.icon_state = icon_state