Add replies filter and tabs

Closes: #31
Changelog-Added: Tabs to switch between posts and replies in home view
Signed-off-by: William Casarin <jb55@jb55.com>

damus/ContentView.swift

@@ -35,6 +35,11 @@ enum ThreadState {
     case chatroom
 }
 
+enum FilterState : Int {
+    case posts_and_replies = 1
+    case posts = 0
+}
+
 struct ContentView: View {
     let keypair: Keypair
     
@@ -59,6 +64,7 @@ struct ContentView: View {
     @State var profile_open: Bool = false
     @State var thread_open: Bool = false
     @State var search_open: Bool = false
+    @State var filter_state : FilterState = .posts_and_replies
     @StateObject var home: HomeModel = HomeModel()
     
     // connect retry timer
@@ -88,18 +94,39 @@ struct ContentView: View {
     }
 
     var PostingTimelineView: some View {
-        ZStack {
-            if let damus = self.damus_state {
-                TimelineView(events: $home.events, loading: $home.loading, damus: damus, show_friend_icon: false)
-            }
-            if privkey != nil {
-                PostButtonContainer {
-                    self.active_sheet = .post
+        VStack{
+            FiltersView
+            ZStack {
+                if let damus = self.damus_state {
+                    TimelineView(events: $home.events, loading: $home.loading, damus: damus, show_friend_icon: false, filter: filter_event)
+                }
+                if privkey != nil {
+                    PostButtonContainer {
+                        self.active_sheet = .post
+                    }
                 }
             }
         }
     }
     
+    var FiltersView: some View {
+        VStack{
+            Picker("Filter State", selection: $filter_state) {
+                Text("Posts").tag(FilterState.posts)
+                Text("Posts & Replies").tag(FilterState.posts_and_replies)
+            }
+            .pickerStyle(.segmented)
+        }
+    }
+    
+    func filter_event(_ ev: NostrEvent) -> Bool {
+        if self.filter_state == .posts {
+            return !ev.is_reply(nil)
+        }
+        
+        return true
+    }
+    
     func MainContent(damus: DamusState) -> some View {
         VStack {
             NavigationLink(destination: MaybeProfileView, isActive: $profile_open) {
@@ -119,7 +146,7 @@ struct ContentView: View {
                 PostingTimelineView
                 
             case .notifications:
-                TimelineView(events: $home.notifications, loading: $home.loading, damus: damus, show_friend_icon: true)
+                TimelineView(events: $home.notifications, loading: $home.loading, damus: damus, show_friend_icon: true, filter: { _ in true })
                     .navigationTitle("Notifications")
                 
             case .dms:

damus/Views/ProfileView.swift

@@ -147,7 +147,7 @@ struct ProfileView: View {
             
                 Divider()
                 
-                InnerTimelineView(events: $profile.events, damus: damus_state, show_friend_icon: false)
+                InnerTimelineView(events: $profile.events, damus: damus_state, show_friend_icon: false, filter: { _ in true })
             }
             .frame(maxHeight: .infinity, alignment: .topLeading)
         }

damus/Views/SearchHomeView.swift

@@ -39,7 +39,7 @@ struct SearchHomeView: View {
     }
     
     var GlobalContent: some View {
-        TimelineView(events: $model.events, loading: $model.loading, damus: damus_state, show_friend_icon: true)
+        TimelineView(events: $model.events, loading: $model.loading, damus: damus_state, show_friend_icon: true, filter: { _ in true })
     }
     
     var SearchContent: some View {

damus/Views/SearchView.swift

@@ -13,7 +13,7 @@ struct SearchView: View {
     @Environment(\.dismiss) var dismiss
     
     var body: some View {
-        TimelineView(events: $search.events, loading: $search.loading, damus: appstate, show_friend_icon: true)
+        TimelineView(events: $search.events, loading: $search.loading, damus: appstate, show_friend_icon: true, filter: { _ in true })
             .navigationBarTitle(describe_search(search.search))
             .padding([.leading, .trailing], 6)
             .onReceive(handle_notify(.switched_timeline)) { obj in

damus/Views/TimelineView.swift

@@ -16,10 +16,11 @@ struct InnerTimelineView: View {
     @Binding var events: [NostrEvent]
     let damus: DamusState
     let show_friend_icon: Bool
+    let filter: (NostrEvent) -> Bool
     
     var body: some View {
         LazyVStack {
-            ForEach(events, id: \.id) { (ev: NostrEvent) in
+            ForEach(events.filter(filter), id: \.id) { (ev: NostrEvent) in
                 let tm = ThreadModel(event: inner_event_or_self(ev: ev), damus_state: damus)
                 let is_chatroom = should_show_chatroom(ev)
                 let tv = ThreadView(thread: tm, damus: damus, is_chatroom: is_chatroom)
@@ -40,6 +41,7 @@ struct TimelineView: View {
 
     let damus: DamusState
     let show_friend_icon: Bool
+    let filter: (NostrEvent) -> Bool
     
     var body: some View {
         MainContent
@@ -52,7 +54,7 @@ struct TimelineView: View {
                     ProgressView()
                         .progressViewStyle(.circular)
                 }
-                InnerTimelineView(events: $events, damus: damus, show_friend_icon: show_friend_icon)
+                InnerTimelineView(events: $events, damus: damus, show_friend_icon: show_friend_icon, filter: filter)
             }
             .onReceive(NotificationCenter.default.publisher(for: .scroll_to_top)) { _ in
                 guard let event = events.first else {