use direct references on root events

references to root should be treated slightly differently, otherwise the
entire thread will be shown when you select the root event.

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Nostr/NostrEvent.swift

@@ -64,7 +64,39 @@ class NostrEvent: Codable, Identifiable {
             }
         }
     }
-
+    
+    public func is_root_event() -> Bool {
+        for tag in tags {
+            if tag.count >= 1 && tag[0] == "e" {
+                return false
+            }
+        }
+        return true
+    }
+    
+    public func directly_references(_ id: String) -> Bool {
+        // conditions: if it only has 1 e ref
+        // OR it has more than 1 e ref, ignoring the first
+        
+        var nrefs = 0
+        var i = 0
+        var first_matched = false
+        var matched = true
+        
+        for tag in tags {
+            if tag.count >= 2 && tag[0] == "e" {
+                nrefs += 1
+                if tag[1] == id {
+                    matched = true
+                    first_matched = nrefs == 1
+                }
+            }
+            i += 1
+        }
+        
+        return (nrefs == 1 && matched) || (nrefs > 1 && matched && !first_matched)
+    }
+    
     public func references(id: String, key: String) -> Bool {
         for tag in tags {
             if tag.count >= 2 && tag[0] == key {

damus/Views/EventDetailView.swift

@@ -208,9 +208,14 @@ func make_reply_map(active: NostrEvent, events: [NostrEvent]) -> [String: ()]
     if events.count == 0 {
         return is_reply
     }
-
+    
+    let is_root = active.is_root_event()
+    
     for ev in events {
-        if ev.references(id: active.id, key: "e") {
+        if is_root && ev.directly_references(active.id) {
+            is_reply[ev.id] = ()
+            start = i
+        } else if !is_root && ev.references(id: active.id, key: "e") {
             is_reply[ev.id] = ()
             start = i
         } else if active.references(id: ev.id, key: "e") {
@@ -257,11 +262,20 @@ func determine_highlight(current: NostrEvent, active: NostrEvent) -> Highlight
     if current.id == active.id {
         return .main
     }
-    if active.references(id: current.id, key: "e") {
-        return .reply
-    } else if current.references(id: active.id, key: "e") {
-        return .reply
+    if active.is_root_event() {
+        if active.directly_references(current.id) {
+            return .reply
+        } else if current.directly_references(active.id) {
+            return .reply
+        }
+    } else {
+        if active.references(id: current.id, key: "e") {
+            return .reply
+        } else if current.references(id: active.id, key: "e") {
+            return .reply
+        }
     }
+    
     return .none
 }