home: dont show reposts for the same note more than once

Fixes: https://github.com/damus-io/damus/issues/859
Changelog-Changed: Don't show reposts for the same note more than once in your home feed
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Components/Reposted.swift

@@ -10,6 +10,7 @@ import SwiftUI
 struct Reposted: View {
     let damus: DamusState
     let pubkey: Pubkey
+    let target: NoteId
 
     var body: some View {
         HStack(alignment: .center) {
@@ -17,8 +18,14 @@ struct Reposted: View {
                 .foregroundColor(Color.gray)
             ProfileName(pubkey: pubkey, damus: damus, show_nip5_domain: false)
                     .foregroundColor(Color.gray)
-            Text("Reposted", comment: "Text indicating that the note was reposted (i.e. re-shared).")
+            let other_reposts = (damus.boosts.counts[target] ?? 0) - 1
+            if other_reposts > 0 {
+                Text(" and \(other_reposts) others reposted", comment: "Text indicating that the note was reposted (i.e. re-shared) by multiple people")
                     .foregroundColor(Color.gray)
+            } else {
+                Text("reposted", comment: "Text indicating that the note was reposted (i.e. re-shared).")
+                    .foregroundColor(Color.gray)
+            }
         }
     }
 }
@@ -26,6 +33,6 @@ struct Reposted: View {
 struct Reposted_Previews: PreviewProvider {
     static var previews: some View {
         let test_state = test_damus_state
-        Reposted(damus: test_state, pubkey: test_state.pubkey)
+        Reposted(damus: test_state, pubkey: test_state.pubkey, target: test_note.id)
     }
 }

damus/Models/HomeModel.swift

@@ -79,6 +79,7 @@ class HomeModel: ContactsDelegate {
     var notifications = NotificationsModel()
     var notification_status = NotificationStatusModel()
     var events: EventHolder = EventHolder()
+    var already_reposted: Set<NoteId> = Set()
     var zap_button: ZapButtonModel = ZapButtonModel()
     
     init() {
@@ -734,6 +735,16 @@ class HomeModel: ContactsDelegate {
             handle_quote_repost_event(ev, target: quoted_event.note_id)
         }
 
+        // don't add duplicate reposts to home
+        if ev.known_kind == .boost, let target = ev.get_inner_event()?.id {
+            if already_reposted.contains(target) {
+                Log.info("Skipping duplicate repost for event %s", for: .timeline, target.hex())
+                return
+            } else {
+                already_reposted.insert(target)
+            }
+        }
+
         if sub_id == home_subid {
             insert_home_event(ev)
         } else if sub_id == notifications_subid {

damus/Util/Log.swift

@@ -14,6 +14,7 @@ enum LogCategory: String {
     case render
     case storage
     case networking
+    case timeline
     case push_notifications
     case damus_purple
     case image_uploading

damus/Views/Reposts/RepostedEvent.swift

@@ -16,7 +16,7 @@ struct RepostedEvent: View {
     var body: some View {
         VStack(alignment: .leading) {
             NavigationLink(value: Route.ProfileByKey(pubkey: event.pubkey)) {
-                Reposted(damus: damus, pubkey: event.pubkey)
+                Reposted(damus: damus, pubkey: event.pubkey, target: inner_ev.id)
                     .padding(.horizontal)
             }
            .buttonStyle(PlainButtonStyle())