Bugfixes: Welding tool, Constructs, Runes (#1072)

Fixes #1066 
Fixes #1065 
Fixes #1053

code/modules/mob/living/silicon/robot/robot.dm

@@ -456,16 +456,20 @@
 			user << "<span class='warning'>You lack the reach to be able to repair yourself.</span>"
 			return
 
-		if (!getBruteLoss())
+		if (getBruteLoss() == 0)
 			user << "Nothing to fix here!"
 			return
 		var/obj/item/weapon/weldingtool/WT = W
+		if (!WT.welding)
+			// Welding tool is switched off
+			user << "<span class='warning'>You need to light the welding tool, first!</span>"
+			return
 		if (WT.remove_fuel(0))
 			adjustBruteLoss(-30)
 			updatehealth()
 			add_fingerprint(user)
 			for(var/mob/O in viewers(user, null))
-				O.show_message(text("\red [user] has fixed some of the dents on [src]!"), 1)
+				O.show_message(text("<span class='warning'>[user] has fixed some of the dents on [src]!</span>"), 1)
 		else
 			user << "Need more welding fuel!"
 			return

code/modules/mob/living/simple_animal/constructs/constructs.dm

@@ -57,11 +57,14 @@
 
 /mob/living/simple_animal/construct/attack_generic(var/mob/user)
 	if(istype(user, /mob/living/simple_animal/construct/builder))
-		if(health < maxHealth)
+		if(getBruteLoss() > 0)
 			adjustBruteLoss(-5)
 			user.visible_message("<span class='notice'>\The [user]</b> mends some of \the [src]'s wounds.</span>")
 		else
-			user << "<span class='notice'>\The [src] is undamaged.</span>"
+			if (health < maxHealth)
+				user << "<span class='notice'>Healing \the [src] any further is beyond your abilities.</span>"
+			else
+				user << "<span class='notice'>\The [src] is undamaged.</span>"
 		return
 	return ..()
 
@@ -131,6 +134,16 @@
 
 	return (..(P))
 
+/mob/living/simple_animal/construct/armoured/UnarmedAttack(var/atom/A, var/proximity)
+	if(istype(A, /obj/machinery))
+		// Destroy machines instead of opening their UI
+		var/obj/machinery/M = A
+		do_attack_animation(M)
+		playsound(loc, attack_sound, 50, 1, 1)
+		M.ex_act(3.0)
+	else
+		..()
+
 
 
 ////////////////////////Wraith/////////////////////////////////////////////