Add filters for home screen

Closes: #25
Changelog-Added: Added ability to hide replies on home timeline

damus/ContentView.swift

@@ -59,6 +59,8 @@ struct ContentView: View {
     @State var profile_open: Bool = false
     @State var thread_open: Bool = false
     @State var search_open: Bool = false
+    @State var filters_showing : Bool = false
+    @State var should_show_replies : Bool = true
     @StateObject var home: HomeModel = HomeModel()
     
     // connect retry timer
@@ -86,18 +88,52 @@ struct ContentView: View {
             Spacer()
         }
     }
+    
+    var FiltersView: some View {
+        VStack{
+            HStack{
+                Toggle("Show Replies", isOn: $should_show_replies)
+                .toggleStyle(SwitchToggleStyle(tint: .purple))
+                .padding(.leading,30)
+                .padding(.trailing,30)
+                
+            }
+        }
+    }
 
     var PostingTimelineView: some View {
-        ZStack {
-            if let damus = self.damus_state {
-                TimelineView(events: $home.events, loading: $home.loading, damus: damus, show_friend_icon: false)
+        VStack{
+            Label("", systemImage: "line.3.horizontal.decrease.circle.fill")
+                .padding(.leading, 10)
+                .frame(maxWidth: .infinity, alignment: .leading)
+                .onTapGesture {
+                    print("Filtering")
+                    self.filters_showing = !self.filters_showing
+                }
+            if(filters_showing){
+                FiltersView
             }
-            if privkey != nil {
-                PostButtonContainer {
-                    self.active_sheet = .post
+            ZStack {
+                if let damus = self.damus_state {
+                    TimelineView(events: $home.events, loading: $home.loading, damus: damus, show_friend_icon: false, filter: filter_event)
+                    //TODO: Add filter function to the events to keep out replies if should_show_replies is false!
+                }
+                if privkey != nil {
+                    PostButtonContainer {
+                        self.active_sheet = .post
+                    }
                 }
             }
         }
+        
+    }
+    
+    func filter_event(_ ev: NostrEvent) -> Bool {
+        if !should_show_replies {
+            return !ev.is_reply(nil)
+        }
+        
+        return true
     }
     
     func MainContent(damus: DamusState) -> some View {
@@ -119,7 +155,7 @@ 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), pool: damus.pool, privkey: damus.keypair.privkey)
                 let is_chatroom = has_hashtag(ev.tags, hashtag: "chat")
                 let tv = ThreadView(thread: tm, damus: damus, is_chatroom: is_chatroom)
@@ -41,6 +42,8 @@ struct TimelineView: View {
     let damus: DamusState
     let show_friend_icon: Bool
     
+    let filter: (NostrEvent) -> Bool 
+    
     var body: some View {
         MainContent
     }
@@ -52,7 +55,7 @@ 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 {