actual tgui code

code/modules/tgui/external.dm

@@ -130,6 +130,13 @@
  */
 /client/var/list/tgui_windows = list()
 
+/**
+ * global
+ *
+ * TRUE if cache was reloaded by tgui dev server at least once.
+ */
+/client/var/tgui_cache_reloaded = FALSE
+
 /**
  * public
  *
@@ -159,16 +166,29 @@
 /**
  * Middleware for /client/Topic.
  *
- * return bool Whether the topic is passed (TRUE), or cancelled (FALSE).
+ * return bool If TRUE, prevents propagation of the topic call.
  */
 /proc/tgui_Topic(href_list)
 	// Skip non-tgui topics
 	if(!href_list["tgui"])
-		return TRUE
+		return FALSE
 	var/type = href_list["type"]
 	// Unconditionally collect tgui logs
 	if(type == "log")
 		log_tgui(usr, href_list["message"])
+	// Reload all tgui windows
+	if(type == "cacheReloaded")
+		if(!check_rights(R_ADMIN) || usr.client.tgui_cache_reloaded)
+			return TRUE
+		// Mark as reloaded
+		usr.client.tgui_cache_reloaded = TRUE
+		// Notify windows
+		var/list/windows = usr.client.tgui_windows
+		for(var/window_id in windows)
+			var/datum/tgui_window/window = windows[window_id]
+			if (window.status == TGUI_WINDOW_READY)
+				window.on_message(type, null, href_list)
+		return TRUE
 	// Locate window
 	var/window_id = href_list["window_id"]
 	var/datum/tgui_window/window
@@ -177,7 +197,7 @@
 		if(!window)
 			log_tgui(usr, "Error: Couldn't find the window datum, force closing.")
 			SStgui.force_close_window(usr, window_id)
-			return FALSE
+			return TRUE
 	// Decode payload
 	var/payload
 	if(href_list["payload"])
@@ -185,4 +205,4 @@
 	// Pass message to window
 	if(window)
 		window.on_message(type, payload, href_list)
-	return FALSE
+	return TRUE