support kind 42 chat messages

Changelog-Added: Support kind 42 chat messages (ArcadeCity).
Signed-off-by: William Casarin <jb55@jb55.com>

damus/ContentView.swift

@@ -187,7 +187,7 @@ struct ContentView: View {
         .sheet(item: $active_sheet) { item in
             switch item {
             case .post:
-                PostView(references: [])
+                PostView(replying_to: nil, references: [])
             case .reply(let event):
                 ReplyView(replying_to: event, damus: damus_state!)
             }

damus/Models/HomeModel.swift

@@ -86,6 +86,7 @@ class HomeModel: ObservableObject {
         }
 
         switch kind {
+        case .chat: fallthrough
         case .text:
             handle_text_event(sub_id: sub_id, ev)
         case .contacts:

damus/Models/Mentions.swift

@@ -279,7 +279,7 @@ func post_to_event(post: NostrPost, privkey: String, pubkey: String) -> NostrEve
     let post_blocks = parse_post_blocks(content: post.content)
     let post_tags = make_post_tags(post_blocks: post_blocks, tags: tags)
     let content = render_blocks(blocks: post_tags.blocks)
-    let new_ev = NostrEvent(content: content, pubkey: pubkey, kind: 1, tags: post_tags.tags)
+    let new_ev = NostrEvent(content: content, pubkey: pubkey, kind: post.kind.rawValue, tags: post_tags.tags)
     new_ev.calculate_id()
     new_ev.sign(privkey: privkey)
     return new_ev

damus/Models/Post.swift

@@ -8,8 +8,21 @@
 import Foundation
 
 struct NostrPost {
+    let kind: NostrKind
     let content: String
     let references: [ReferencedId]
+    
+    init (content: String, references: [ReferencedId]) {
+        self.content = content
+        self.references = references
+        self.kind = .text
+    }
+    
+    init (content: String, references: [ReferencedId], kind: NostrKind) {
+        self.content = content
+        self.references = references
+        self.kind = kind
+    }
 }
 
 // TODO: parse nostr:{e,p}:pubkey uris as well

damus/Nostr/NostrKind.swift

@@ -16,4 +16,5 @@ enum NostrKind: Int {
     case delete = 5
     case boost = 6
     case like = 7
+    case chat = 42
 }

damus/Views/PostView.swift

@@ -18,6 +18,7 @@ struct PostView: View {
     @State var post: String = POST_PLACEHOLDER
     @State var new: Bool = true
 
+    let replying_to: NostrEvent?
     @FocusState var focus: Bool
     let references: [ReferencedId]
 
@@ -37,7 +38,12 @@ struct PostView: View {
     }
 
     func send_post() {
-        let new_post = NostrPost(content: self.post, references: references)
+        var kind: NostrKind = .text
+        if replying_to?.known_kind == .chat {
+            kind = .chat
+        }
+        let new_post = NostrPost(content: self.post, references: references, kind: kind)
+
         NotificationCenter.default.post(name: .post, object: NostrPostResult.post(new_post))
         dismiss()
     }

damus/Views/ReplyView.swift

@@ -34,7 +34,7 @@ struct ReplyView: View {
                     .font(.footnote)
             }
             EventView(event: replying_to, highlight: .none, has_action_bar: false, damus: damus, show_friend_icon: true)
-            PostView(references: gather_reply_ids(our_pubkey: damus.pubkey, from: replying_to))
+            PostView(replying_to: replying_to, references: gather_reply_ids(our_pubkey: damus.pubkey, from: replying_to))
         }
         .padding()
         

damus/Views/ThreadView.swift

@@ -51,7 +51,7 @@ struct ThreadView: View {
                     return
                 }
                 seen_first = true
-                is_chatroom = has_hashtag(ev.tags, hashtag: "chat")
+                is_chatroom = should_show_chatroom(ev) 
             }
         }
         .onAppear() {
@@ -71,9 +71,17 @@ struct ThreadView_Previews: PreviewProvider {
 }
 */
 
+func should_show_chatroom(_ ev: NostrEvent) -> Bool {
+    if ev.known_kind == .chat {
+        return true
+    }
+    
+    return has_hashtag(ev.tags, hashtag: "chat")
+}
+
 func has_hashtag(_ tags: [[String]], hashtag: String) -> Bool {
     for tag in tags {
-        if tag.count >= 2 && tag[0] == "hashtag" && tag[1] == hashtag {
+        if tag.count >= 2 && (tag[0] == "hashtag" || tag[0] == "t") && tag[1] == hashtag {
             return true
         }
     }

damus/Views/TimelineView.swift

@@ -21,7 +21,7 @@ struct InnerTimelineView: View {
         LazyVStack {
             ForEach(events, id: \.id) { (ev: NostrEvent) in
                 let tm = ThreadModel(event: inner_event_or_self(ev: ev), pool: damus.pool, privkey: damus.keypair.privkey)
-                let is_chatroom = has_hashtag(ev.tags, hashtag: "chat")
+                let is_chatroom = should_show_chatroom(ev)
                 let tv = ThreadView(thread: tm, damus: damus, is_chatroom: is_chatroom)
                             
                 NavigationLink(destination: tv) {