added some unused code for isRelevant logic in writing to file

lib/tree_ds.dart

@@ -2046,6 +2046,16 @@ class Store {
       return room;
   }
 
+
+  // TODO to be finished
+  bool isRelevant(Tree tree) {
+    //Set<String> contacts = getContactList(userPublicKey);
+    //contacts = contacts.union(gDefaultFollows);
+
+
+    return true;
+  }
+
   // Write the tree's events to file as one event's json per line
   Future<void> writeEventsToFile(String filename) async {
     if( gDebug > 0) print("opening $filename to write to.");
@@ -2083,6 +2093,11 @@ class Store {
           continue;
         }
 
+        if( !isRelevant(tree)) {
+          continue;
+        }
+        
+
         String temp = tree.event.originalJson.trim();
         String line = "${temp}\n";
         nLinesStr += line;

lib/user.dart

@@ -92,4 +92,23 @@ Set<String> getOnlyUserEvents(Set<Event> initialEvents, String userPubkey) {
     }
   });
   return userEvents;
+}
+
+
+Set<String> getContactList(String pubkey) {
+  Set<String> contacts = {};
+
+  if( pubkey != "") {
+    // get the latest kind 3 event for the user, which has the 'follows' list
+    Event? contactEvent = getContactEvent(userPublicKey);
+
+    // if contact list was found, get user's feed; also get some default contacts
+    if (contactEvent != null ) {
+      contactEvent.eventData.contactList.forEach((contact) {
+        contacts.add(contact.contactPubkey);
+      });
+    } else {
+    }
+  }
+  return contacts;
 }