Headsets will now show the prefixes necessary to access the channels (#33941)

* prefixes

* Changes CARGO_PREFIX to SUPPLY_PREFIX

* updates comment

__DEFINES/communications.dm

@@ -15,6 +15,22 @@
 #define RAIDER "Vox Raiders"
 #define BUG "Radio Bug"
 
+//Communication prefixes to communicate on these radio freqs. So far only used for detecting which frequency
+//belongs to what prefix, showing it off in the radio headset.
+//These don't actually determine which prefix belongs to what, it's just a reference point
+#define COMMON_PREFIX "o"
+#define SECURITY_PREFIX "s"
+#define ENGINEERING_PREFIX "e"
+#define COMMAND_PREFIX "c"
+#define MEDICAL_PREFIX "m"
+#define SCIENCE_PREFIX "n"
+#define SERVICE_PREFIX "d"
+#define SUPPLY_PREFIX "u"
+#define DEATHSQUAD_PREFIX "0"
+#define RESPONSE_PREFIX "-"
+#define AIPRIVATE_PREFIX "p"
+#define SYNDICATE_PREFIX "t"
+
 var/list/freq_text = list(COMMON,SECURITY_COMM,ENGINEERING,COMMAND,MEDICAL,SCIENCE,SERVICE,CARGO,DEATHSQUAD_COMM,RESPONSE,AIPRIVATE,DJ,REV_COMM, SYND, RAIDER, BUG)
 var/list/freqs = list() //Generated by generate_radio_frequencies, in more_init_stuff.dm
 
@@ -45,4 +61,4 @@ var/list/radiochannelsreverse = list()
 var/list/stationchannels = list()
 
 //For custom stuff
-var/list/freqtocolor = list()
+var/list/freqtocolor = list()

code/game/objects/items/devices/radio/radio.dm

@@ -119,10 +119,41 @@
 
 /obj/item/device/radio/proc/text_sec_channel(var/chan_name, var/chan_stat)
 	var/list = !!(chan_stat&FREQ_LISTENING)!=0
+	var/chan_prefix = fetch_prefix(chan_name)
 	return {"
-			<B>[chan_name]</B>: <A href='byond://?src=\ref[src];ch_name=[chan_name];listen=[!list]'>[list ? "Engaged" : "Disengaged"]</A><BR>
+			<B>[chan_name][chan_prefix ? " (:[chan_prefix]) " : ""]</B>: <A href='byond://?src=\ref[src];ch_name=[chan_name];listen=[!list]'>[list ? "Engaged" : "Disengaged"]</A><BR>
 			"}
 
+//Finds if there is a defined prefix for the channel noted in _DEFINES/communications.dm
+//It's ugly but if it was as easy as slapping [chan_name]_PREFIX to call the associated prefix.
+//This way it also doesn't cause unforeseen consequences.
+/obj/item/device/radio/proc/fetch_prefix(var/chan_name)
+	switch(chan_name)
+		if("Common")
+			return COMMON_PREFIX
+		if("Security")
+			return SECURITY_PREFIX
+		if("Engineering")
+			return ENGINEERING_PREFIX
+		if("Command")
+			return COMMAND_PREFIX
+		if("Medical")
+			return MEDICAL_PREFIX
+		if("Science")
+			return SCIENCE_PREFIX
+		if("Service")
+			return SERVICE_PREFIX
+		if("Supply")
+			return SUPPLY_PREFIX
+		if("Deathsquad")
+			return DEATHSQUAD_PREFIX
+		if("Response Team")
+			return RESPONSE_PREFIX
+		if("AI Private")
+			return AIPRIVATE_PREFIX
+		if("Syndicate")
+			return SYNDICATE_PREFIX
+
 /obj/item/device/radio/Topic(href, href_list)
 	if (!isAdminGhost(usr) && (usr.stat || !on))
 		return 1