[MIRROR] Give more control over conveyor switch circuits (#2269) (#3140)

* Give more control over conveyor switch circuits (#82857)

## About The Pull Request
This adds more signals to the conveyor switch circuits, specifically for
going forward, stopping, or reversing. One-way conveyor switches will
not get the reverse signal (as shown by the bottom right switch in the
video).


https://github.com/tgstation/tgstation/assets/16826524/66f287de-8413-41df-a69c-51b9ab8d7a02

## Why It's Good For The Game
This makes it far easier to make contraptions such as sorting mechanisms
using circuits without the need to toggle multiple times just to get the
conveyor direction into the state you need it in.

## Changelog
:cl:
qol: conveyor switches now have direction-specific input signals
/:cl:

* Give more control over conveyor switch circuits

---------

Co-authored-by: NovaBot <[email protected]>
Co-authored-by: Echriser <[email protected]>

code/modules/recycling/conveyor.dm

@@ -590,12 +590,18 @@ GLOBAL_LIST_EMPTY(conveyors_by_id)
 	desc = "Allows to control connected conveyor belts."
 	circuit_flags = CIRCUIT_FLAG_INPUT_SIGNAL
 
+	/// Direction input ports.
+	var/datum/port/input/stop
+	var/datum/port/input/active
+	var/datum/port/input/reverse
 	/// The current direction of the conveyor attached to the component.
 	var/datum/port/output/direction
 	/// The switch this conveyor switch component is attached to.
 	var/obj/machinery/conveyor_switch/attached_switch
 
 /obj/item/circuit_component/conveyor_switch/populate_ports()
+	active = add_input_port("Activate", PORT_TYPE_SIGNAL, trigger = PROC_REF(activate))
+	stop = add_input_port("Stop", PORT_TYPE_SIGNAL, trigger = PROC_REF(stop))
 	direction = add_output_port("Conveyor Direction", PORT_TYPE_NUMBER)
 
 /obj/item/circuit_component/conveyor_switch/get_ui_notices()
@@ -606,6 +612,8 @@ GLOBAL_LIST_EMPTY(conveyors_by_id)
 	. = ..()
 	if(istype(shell, /obj/machinery/conveyor_switch))
 		attached_switch = shell
+		if(!attached_switch.oneway)
+			reverse = add_input_port("Reverse", PORT_TYPE_SIGNAL, trigger = PROC_REF(reverse))
 
 /obj/item/circuit_component/conveyor_switch/unregister_usb_parent(atom/movable/shell)
 	attached_switch = null
@@ -617,15 +625,33 @@ GLOBAL_LIST_EMPTY(conveyors_by_id)
 
 	INVOKE_ASYNC(src, PROC_REF(update_conveyors), port)
 
+/obj/item/circuit_component/conveyor_switch/proc/on_switch_changed()
+	attached_switch.update_appearance()
+	attached_switch.update_linked_conveyors()
+	attached_switch.update_linked_switches()
+	direction.set_output(attached_switch.position)
+
+/obj/item/circuit_component/conveyor_switch/proc/activate()
+	SIGNAL_HANDLER
+	attached_switch.position = CONVEYOR_FORWARD
+	INVOKE_ASYNC(src, PROC_REF(on_switch_changed))
+
+/obj/item/circuit_component/conveyor_switch/proc/stop()
+	SIGNAL_HANDLER
+	attached_switch.position = CONVEYOR_OFF
+	INVOKE_ASYNC(src, PROC_REF(on_switch_changed))
+
+/obj/item/circuit_component/conveyor_switch/proc/reverse()
+	SIGNAL_HANDLER
+	attached_switch.position = CONVEYOR_BACKWARDS
+	INVOKE_ASYNC(src, PROC_REF(on_switch_changed))
+
 /obj/item/circuit_component/conveyor_switch/proc/update_conveyors(datum/port/input/port)
 	if(!attached_switch)
 		return
 
 	attached_switch.update_position()
-	attached_switch.update_appearance()
-	attached_switch.update_linked_conveyors()
-	attached_switch.update_linked_switches()
-	direction.set_output(attached_switch.position)
+	INVOKE_ASYNC(src, PROC_REF(on_switch_changed))
 
 #undef CONVEYOR_BACKWARDS
 #undef CONVEYOR_OFF