Merge pull request #11921 from Couls/TG-chat-subsystem

Port TG's chat subsystem

code/controllers/subsystem/chat.dm

@@ -0,0 +1,65 @@
+SUBSYSTEM_DEF(chat)
+	name = "Chat"
+	flags = SS_TICKER|SS_NO_INIT
+	wait = 1
+	priority = FIRE_PRIORITY_CHAT
+	init_order = INIT_ORDER_CHAT
+
+	var/list/payload = list()
+
+
+/datum/controller/subsystem/chat/fire()
+	for(var/i in payload)
+		var/client/C = i
+		C << output(payload[C], "browseroutput:output")
+		payload -= C
+
+		if(MC_TICK_CHECK)
+			return
+
+
+/datum/controller/subsystem/chat/proc/queue(target, message, flag)
+	if(!target || !message)
+		return
+
+	if(!istext(message))
+		stack_trace("to_chat called with invalid input type")
+		return
+
+	if(target == world)
+		target = GLOB.clients
+
+	//Some macros remain in the string even after parsing and fuck up the eventual output
+	message = replacetext(message, "\improper", "")
+	message = replacetext(message, "\proper", "")
+	message += "<br>"
+
+
+	//url_encode it TWICE, this way any UTF-8 characters are able to be decoded by the Javascript.
+	//Do the double-encoding here to save nanoseconds
+	var/twiceEncoded = url_encode(url_encode(message))
+
+	if(islist(target))
+		for(var/I in target)
+			var/client/C = CLIENT_FROM_VAR(I) //Grab us a client if possible
+
+			if(!C?.chatOutput || C.chatOutput.broken) //A player who hasn't updated his skin file.
+				continue
+
+			if(!C.chatOutput.loaded) //Client still loading, put their messages in a queue
+				C.chatOutput.messageQueue += message
+				continue
+
+			payload[C] += twiceEncoded
+
+	else
+		var/client/C = CLIENT_FROM_VAR(target) //Grab us a client if possible
+
+		if(!C?.chatOutput || C.chatOutput.broken) //A player who hasn't updated his skin file.
+			return
+
+		if(!C.chatOutput.loaded) //Client still loading, put their messages in a queue
+			C.chatOutput.messageQueue += message
+			return
+
+		payload[C] += twiceEncoded