Improvements to NTNet and file mechanics

- Small adjustments to NTNet behaviour.
- Adds "undeletable" and "unmovable" flags for computer files. Intended to use for ROM-style programs that are necessary for PC to work.
- Programs now know NTNet status and can act differently depending on this.

code/modules/modular_computers/NTNet/NTNet.dm

@@ -16,6 +16,7 @@ var/global/datum/ntnet/ntnet_global = new()
 		ntnet_global = src // There can be only one.
 	for(var/obj/machinery/ntnet_relay/R in machines)
 		relays.Add(R)
+		R.NTNet = src
 
 /datum/ntnet/proc/check_function(var/specific_action = 0)
 	if(!relays || !relays.len) // No relays found. NTNet is down

code/modules/modular_computers/NTNet/NTNet_relay.dm

@@ -5,6 +5,9 @@
 	use_power = 1
 	idle_power_usage = 20000 //20kW, apropriate for machine that keeps massive cross-Zlevel wireless network operational.
 	icon_state = "bus"
+	anchored = 1
+	density = 1
+	var/NTNet = null // This is mostly for backwards reference and to allow varedit modifications from ingame.
 
 // TODO: Implement more logic here. For now it's only a placeholder.
 /obj/machinery/ntnet_relay/proc/is_operational()
@@ -15,7 +18,11 @@
 /obj/machinery/ntnet_relay/New()
 	if(ntnet_global)
 		ntnet_global.relays.Add(src)
+		NTNet = ntnet_global
+	..()
 
 /obj/machinery/ntnet_relay/Destroy()
 	if(ntnet_global)
-		ntnet_global.relays.Remove(src)
+		ntnet_global.relays.Remove(src)
+		NTNet = null
+	..()

code/modules/modular_computers/computers/modular_computer.dm

@@ -271,6 +271,7 @@
 
 	data["PC_stationtime"] = worldtime2text()
 	data["PC_hasheader"] = 1
+	data["PC_showexitprogram"] = active_program ? 1 : 0 // Hides "Exit Program" button on mainscreen
 	return data
 
 

code/modules/modular_computers/file_system/computer_file.dm

@@ -4,7 +4,8 @@
 	var/size = 1									// File size in GQ (default 1, do not change unless you really have to). Non-1 values are currently unused but they should be supported.
 	var/datum/computer_hardware/hard_drive/holder	// Holder that contains this file.
 	var/icon_path = null							// !!32x32!! icon of this program
-
+	var/unsendable = 0								// Whether the file may be sent to someone via NTNet transfer or other means.
+	var/undeletable = 0								// Whether the file may be deleted. Setting to 1 prevents deletion/renaming/etc.
 
 /datum/computer_file/Destroy()
 	if(!holder)
@@ -15,4 +16,4 @@
 	if(holder.holder && holder.holder.active_program == src)
 		holder.holder.kill_program(1)
 	holder = null
-	..()
+	..()

code/modules/modular_computers/file_system/program.dm

@@ -8,10 +8,11 @@
 	var/running = 1							// Set to 1 when the program is run and back to 0 when it's stopped.
 	var/atom/movable/computer = null		// Device that runs this program.
 	var/filedesc = "Unknown Program"		// User-friendly name of this program.
-	var/fileicon = "unknwn"					// Name of relevant icon that is displayed with the program
+	var/fileicon = "unknwn"					// Name of relevant icon that is displayed with the program. Currently unused.
 	var/laptop_icon_state = null			// Program-specific icon state (stored in /icons/obj/computer3.dmi)
 	var/requires_ntnet = 0					// Set to 1 for program to require nonstop NTNet connection to run. If NTNet connection is lost program crashes.
 	var/requires_ntnet_feature = 0			// Optional, if above is set to 1 checks for specific function of NTNet (currently NTNET_SOFTWAREDOWNLOAD, NTNET_PEERTOPEER, NTNET_SYSTEMCONTROL and NTNET_COMMUNICATION)
+	var/ntnet_status = 1					// NTNet status, updated every tick by computer running this program. Don't use this for checks if NTNet works, computers do that. Use this for calculations, etc.
 
 /datum/computer_file/program/New(var/atom/movable/comp = null)
 	..()
@@ -92,4 +93,5 @@
 
 	if(computer)
 		computer.Topic(href, href_list)
-	..()
+	..()
+

code/modules/modular_computers/hardware/network_card.dm

@@ -3,6 +3,7 @@
 	desc = "A basic network card for usage with standard NTNet frequencies."
 	power_usage = 50
 	critical = 0
+	var/identification_string = "" // Identification string, technically nickname seen in the network. Can be set by user.
 	var/long_range = 0
 	var/ethernet = 0 // Hard-wired, therefore always on, ignores NTNet wireless checks.