Show chatroom first if content contains #chat

Changelog-Added: Load chat view first if content contains #chat
Signed-off-by: William Casarin <jb55@jb55.com>

damus/ContentView.swift

@@ -147,7 +147,7 @@ struct ContentView: View {
         Group {
             if let evid = self.active_event_id {
                 let thread_model = ThreadModel(evid: evid, pool: damus_state!.pool, privkey: damus_state!.keypair.privkey)
-                ThreadView(thread: thread_model, damus: damus_state!)
+                ThreadView(thread: thread_model, damus: damus_state!, is_chatroom: false)
             } else {
                 EmptyView()
             }

damus/Nostr/NostrEvent.swift

@@ -45,7 +45,11 @@ struct EventId: Identifiable, CustomStringConvertible {
     }
 }
 
-class NostrEvent: Codable, Identifiable, CustomStringConvertible {
+class NostrEvent: Codable, Identifiable, CustomStringConvertible, Equatable {
+    static func == (lhs: NostrEvent, rhs: NostrEvent) -> Bool {
+        return lhs.id == rhs.id
+    }
+    
     var id: String
     var sig: String
     var tags: [[String]]

damus/Views/ThreadView.swift

@@ -9,9 +9,10 @@ import SwiftUI
 
 
 struct ThreadView: View {
-    @State var is_chatroom: Bool = false
     @StateObject var thread: ThreadModel
     let damus: DamusState
+    @State var is_chatroom: Bool
+    @State var seen_first: Bool = false
     
     @Environment(\.dismiss) var dismiss
     
@@ -41,6 +42,15 @@ struct ThreadView: View {
             is_chatroom = !is_chatroom
             //print("is_chatroom: \(is_chatroom)")
         }
+        .onChange(of: thread.events) { val in
+            if seen_first {
+                return
+            }
+            if let ev = thread.events.first {
+                seen_first = true
+                is_chatroom = has_hashtag(ev.tags, hashtag: "chat")
+            }
+        }
         .onAppear() {
             thread.subscribe()
         }
@@ -57,3 +67,13 @@ struct ThreadView_Previews: PreviewProvider {
     }
 }
 */
+
+func has_hashtag(_ tags: [[String]], hashtag: String) -> Bool {
+    for tag in tags {
+        if tag.count >= 2 && tag[0] == "hashtag" && tag[1] == hashtag {
+            return true
+        }
+    }
+    
+    return false
+}

damus/Views/TimelineView.swift

@@ -19,7 +19,7 @@ struct InnerTimelineView: View {
     var body: some View {
         LazyVStack {
             ForEach(events, id: \.id) { (ev: NostrEvent) in
-                let tv = ThreadView(thread: ThreadModel(event: ev, pool: damus.pool, privkey: damus.keypair.privkey), damus: damus)
+                let tv = ThreadView(thread: ThreadModel(event: ev, pool: damus.pool, privkey: damus.keypair.privkey), damus: damus, is_chatroom: has_hashtag(ev.tags, hashtag: "chat"))
                             
                 NavigationLink(destination: tv) {
                     EventView(event: ev, highlight: .none, has_action_bar: true, damus: damus)