Tool bit initial implementation

code/game/objects/items.dm

@@ -173,6 +173,14 @@ GLOBAL_DATUM_INIT(welding_sparks, /mutable_appearance, mutable_appearance('icons
 
 	var/tip_timer = 0
 
+	// Smithing vars
+	/// List of attached tool bits
+	var/list/attached_bits = list()
+	/// Maximum number of bits
+	var/max_bits = 1
+	/// Can this item equip bits?
+	var/can_have_bits = FALSE
+
 	///////////////////////////
 	// MARK: item hover FX
 	///////////////////////////
@@ -435,6 +443,29 @@ GLOBAL_DATUM_INIT(welding_sparks, /mutable_appearance, mutable_appearance('icons
 			user.transfer_fingerprints_to(src)
 		else
 			to_chat(user, "<span class='notice'>You don't have enough tape to do that!</span>")
+	else if(istype(I, /obj/item/smithed_item/tool_bit) && can_have_bits)
+		if(length(attached_bits) >= max_bits)
+			to_chat(user, "<span class='notice'>Your tool already has the maximum number of bits!</span>")
+			return
+		var/obj/item/smithed_item/tool_bit/bit = I
+		bit.forceMove(src)
+		attached_bits += bit
+		bit.on_attached(user, src)
+
+/obj/item/AltClick(mob/user)
+	. = ..()
+	if(!attached_bits)
+		to_chat(user, "<span class='notice'>Your [src] has no tool bits to remove.</span>")
+		return
+	var/obj/item/smithed_item/tool_bit/old_bit
+	if(length(attached_bits) == 1)
+		old_bit = attached_bits[0]
+	else
+		attached_bits = tgui_input_list(user, "Select a tool bit", src, attached_bits)
+	if(!istype(old_bit, /obj/item/smithed_item/tool_bit))
+		return
+	old_bit.on_detached()
+	user.put_in_hands(old_bit)
 
 /obj/item/proc/hit_reaction(mob/living/carbon/human/owner, atom/movable/hitby, attack_text = "the attack", final_block_chance = 0, damage = 0, attack_type = MELEE_ATTACK)
 	var/signal_result = (SEND_SIGNAL(src, COMSIG_ITEM_HIT_REACT, owner, hitby, damage, attack_type)) + prob(final_block_chance)

code/game/objects/items/tools/crowbar.dm

@@ -17,6 +17,7 @@
 	origin_tech = "engineering=1;combat=1"
 	attack_verb = list("attacked", "bashed", "battered", "bludgeoned", "whacked")
 	toolspeed = 1
+	can_have_bits = TRUE
 
 	armor = list(MELEE = 0, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, RAD = 0, FIRE = 50, ACID = 30)
 	tool_behaviour = TOOL_CROWBAR

code/game/objects/items/tools/hammer.dm

@@ -15,6 +15,7 @@
 	origin_tech = "engineering=1;combat=1"
 	attack_verb = list("attacked", "hammered", "smashed", "bludgeoned", "whacked")
 	toolspeed = 1
+	can_have_bits = TRUE
 
 	armor = list(MELEE = 0, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, RAD = 0, FIRE = 50, ACID = 30)
 	tool_behaviour = TOOL_HAMMER

code/game/objects/items/tools/multitool.dm

@@ -23,6 +23,7 @@
 	materials = list(MAT_METAL = 300, MAT_GLASS = 140)
 	origin_tech = "magnets=1;engineering=2"
 	toolspeed = 1
+	can_have_bits = TRUE
 	tool_behaviour = TOOL_MULTITOOL
 	hitsound = 'sound/weapons/tap.ogg'
 	/// Reference to whatever machine is held in the buffer

code/game/objects/items/tools/screwdriver.dm

@@ -21,6 +21,7 @@
 	drop_sound = 'sound/items/handling/screwdriver_drop.ogg'
 	pickup_sound =  'sound/items/handling/screwdriver_pickup.ogg'
 	tool_behaviour = TOOL_SCREWDRIVER
+	can_have_bits = TRUE
 	var/random_color = TRUE //if the screwdriver uses random coloring
 
 	new_attack_chain = TRUE

code/game/objects/items/tools/tool_behaviour.dm

@@ -37,6 +37,14 @@
 	// but only if the delay between the beginning and the end is not too small
 	if(delay >= MIN_TOOL_SOUND_DELAY)
 		play_tool_sound(target, volume)
+
+	// If it has a bit, wear and tear
+	for(var/obj/item/smithed_item/tool_bit/bit in attached_bits)
+		bit.durability--
+		if(bit.durability == 0)
+			attached_bits -= bit
+			bit.break_bit()
+
 	return TRUE
 
 // Called before use_tool if there is a delay, or by use_tool if there isn't.

code/game/objects/items/tools/welder.dm

@@ -25,6 +25,7 @@
 	usesound = 'sound/items/welder.ogg'
 	drop_sound = 'sound/items/handling/weldingtool_drop.ogg'
 	pickup_sound =  'sound/items/handling/weldingtool_pickup.ogg'
+	can_have_bits = TRUE
 	var/maximum_fuel = 20
 	/// Set to FALSE if it doesn't need fuel, but serves equally well as a cost modifier.
 	var/requires_fuel = TRUE

code/game/objects/items/tools/wirecutters.dm

@@ -22,6 +22,7 @@
 	armor = list(MELEE = 0, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, RAD = 0, FIRE = 50, ACID = 30)
 	tool_behaviour = TOOL_WIRECUTTER
 	var/random_color = TRUE
+	can_have_bits = TRUE
 
 	new_attack_chain = TRUE
 

code/game/objects/items/tools/wrench.dm

@@ -18,6 +18,7 @@
 	toolspeed = 1
 	armor = list(MELEE = 0, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, RAD = 0, FIRE = 50, ACID = 30)
 	tool_behaviour = TOOL_WRENCH
+	can_have_bits = TRUE
 
 	new_attack_chain = TRUE
 

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

@@ -231,6 +231,7 @@
 	armor = list(MELEE = 0, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, RAD = 0, FIRE = 100, ACID = 50)
 	resistance_flags = FIRE_PROOF
 	new_attack_chain = TRUE
+	can_have_bits = TRUE
 	/// No ammo warning
 	var/no_ammo_message = "<span class='warning'>The \'Low Ammo\' light on the device blinks yellow.</span>"
 	/// The spark system used to create sparks when the user interacts with the RCD.

code/modules/crafting/smithed_items.dm

@@ -197,6 +197,7 @@
 	attached_suit.siemens_coefficient += siemens_coeff
 	attached_suit.min_cold_protection_temperature += heat_insulation
 	attached_suit.max_heat_protection_temperature -= heat_insulation
+	attached_suit = null
 
 /obj/item/smithed_item/insert/ballistic
 	name = "ballistic plate"
@@ -318,10 +319,13 @@
 	if(!istype(target))
 		return
 	attached_tool = target
+	attached_tool.w_class += size_mod
 	attached_tool.toolspeed = toolspeed * speed_mod
 
 /obj/item/smithed_item/tool_bit/on_detached()
 	attached_tool.toolspeed = toolspeed / speed_mod
+	attached_tool.w_class -= size_mod
+	attached_tool = null
 
 /obj/item/smithed_item/tool_bit/proc/break_bit()
 	on_detached()
@@ -407,6 +411,7 @@
 		var/obj/item/projectile/e_bullet = casing.projectile_type
 		e_bullet.damage = e_bullet.damage / damage_mult
 		e_bullet.speed = e_bullet.speed * laser_speed_mult
+	attached_gun = null
 
 /obj/item/smithed_item/lense/proc/break_lense()
 	on_detached()

code/modules/projectiles/guns/energy_guns.dm

@@ -155,6 +155,11 @@
 /obj/item/gun/energy/process_fire(atom/target, mob/living/user, message = 1, params, zone_override, bonus_spread = 0)
 	if(!chambered && can_shoot())
 		process_chamber()
+	if(current_lense)
+		current_lense.durability--
+		if(current_lense.durability <= 0)
+			current_lense.break_lense()
+			current_lense = null
 	return ..()
 
 /obj/item/gun/energy/proc/select_fire(mob/living/user)

code/modules/surgery/tools.dm

@@ -10,6 +10,7 @@
 	w_class = WEIGHT_CLASS_SMALL
 	origin_tech = "materials=1;biotech=1"
 	tool_behaviour = TOOL_RETRACTOR
+	can_have_bits = TRUE
 
 /obj/item/retractor/Initialize(mapload)
 	. = ..()
@@ -33,6 +34,7 @@
 	origin_tech = "materials=1;biotech=1"
 	attack_verb = list("attacked", "pinched")
 	tool_behaviour = TOOL_HEMOSTAT
+	can_have_bits = TRUE
 
 /obj/item/hemostat/Initialize(mapload)
 	. = ..()
@@ -56,6 +58,7 @@
 	origin_tech = "materials=1;biotech=1"
 	attack_verb = list("burnt")
 	tool_behaviour = TOOL_CAUTERY
+	can_have_bits = TRUE
 
 /obj/item/cautery/attack__legacy__attackchain(mob/living/target, mob/living/user)
 	if(!cigarette_lighter_act(user, target))
@@ -103,6 +106,7 @@
 	origin_tech = "materials=1;biotech=1"
 	attack_verb = list("drilled")
 	tool_behaviour = TOOL_DRILL
+	can_have_bits = TRUE
 
 /obj/item/surgicaldrill/Initialize(mapload)
 	. = ..()
@@ -140,6 +144,7 @@
 	attack_verb = list("attacked", "slashed", "stabbed", "sliced", "torn", "ripped", "diced", "cut")
 	hitsound = 'sound/weapons/bladeslice.ogg'
 	tool_behaviour = TOOL_SCALPEL
+	can_have_bits = TRUE
 
 /obj/item/scalpel/Initialize(mapload)
 	. = ..()
@@ -242,6 +247,7 @@
 	origin_tech = "biotech=1;combat=1"
 	attack_verb = list("attacked", "slashed", "sawed", "cut")
 	tool_behaviour = TOOL_SAW
+	can_have_bits = TRUE
 
 /obj/item/circular_saw/Initialize(mapload)
 	. = ..()
@@ -266,6 +272,7 @@
 	throwforce = 1.0
 	origin_tech = "materials=1;biotech=1"
 	tool_behaviour = TOOL_BONEGEL
+	can_have_bits = TRUE
 
 /obj/item/bonegel/Initialize(mapload)
 	. = ..()
@@ -286,6 +293,7 @@
 	origin_tech = "materials=1;biotech=1"
 	w_class = WEIGHT_CLASS_SMALL
 	tool_behaviour = TOOL_FIXOVEIN
+	can_have_bits = TRUE
 
 /obj/item/fix_o_vein/Initialize(mapload)
 	. = ..()
@@ -309,6 +317,7 @@
 	attack_verb = list("attacked", "hit", "bludgeoned")
 	origin_tech = "materials=1;biotech=1"
 	tool_behaviour = TOOL_BONESET
+	can_have_bits = TRUE
 
 /obj/item/bonesetter/Initialize(mapload)
 	. = ..()

code/modules/telesci/rcs.dm

@@ -18,6 +18,7 @@
 	throw_range = 5
 	toolspeed = 1
 	usesound = 'sound/weapons/flash.ogg'
+	can_have_bits = TRUE
 	/// Power cell (10000W)
 	var/obj/item/stock_parts/cell/high/rcell = null
 	/// Selected telepad