ui: add follow hashtag ui on search view

damus/Views/SearchView.swift

@@ -11,32 +11,70 @@ struct SearchView: View {
     let appstate: DamusState
     @ObservedObject var search: SearchModel
     @Environment(\.dismiss) var dismiss
-    
+
+    let height: CGFloat = 250.0
+
     var body: some View {
-        TimelineView<AnyView>(events: search.events, loading: $search.loading, damus: appstate, show_friend_icon: true, filter: { _ in true })
-            .navigationBarTitle(describe_search(search.search))
-            .onReceive(handle_notify(.switched_timeline)) { obj in
-                dismiss()
-            }
-            .onAppear() {
-                search.subscribe()
-            }
-            .onDisappear() {
-                search.unsubscribe()
-            }
-            .onReceive(handle_notify(.new_mutes)) { notif in
-                search.filter_muted()
+        TimelineView(events: search.events, loading: $search.loading, damus: appstate, show_friend_icon: true, filter: { _ in true }) {
+            ZStack(alignment: .leading) {
+                DamusBackground(maxHeight: height)
+                    .mask(LinearGradient(gradient: Gradient(colors: [.black, .black, .black, .clear]), startPoint: .top, endPoint: .bottom))
+                SearchHeaderView(state: appstate, described: described_search)
+                    .padding(.leading, 30)
+                    .padding(.top, 100)
             }
+        }
+        .ignoresSafeArea()
+        .onReceive(handle_notify(.switched_timeline)) { obj in
+            dismiss()
+        }
+        .onAppear() {
+            search.subscribe()
+        }
+        .onDisappear() {
+            search.unsubscribe()
+        }
+        .onReceive(handle_notify(.new_mutes)) { notif in
+            search.filter_muted()
+        }
+    }
+
+    var described_search: DescribedSearch {
+        return describe_search(search.search)
     }
 }
 
-func describe_search(_ filter: NostrFilter) -> String {
-    if let hashtags = filter.hashtag {
-        if hashtags.count >= 1 {
-            return "#" + hashtags[0]
+enum DescribedSearch {
+    case hashtag(String)
+    case unknown
+
+    var is_hashtag: String? {
+        switch self {
+        case .hashtag(let ht):
+            return ht
+        case .unknown:
+            return nil
         }
     }
-    return "Search"
+
+    var description: String {
+        switch self {
+        case .hashtag(let s):
+            return "#" + s
+        case .unknown:
+            return "Search"
+        }
+    }
+}
+
+func describe_search(_ filter: NostrFilter) -> DescribedSearch {
+    if let hashtags = filter.hashtag {
+        if hashtags.count >= 1 {
+            return .hashtag(hashtags[0])
+        }
+    }
+
+    return .unknown
 }
 
 struct SearchView_Previews: PreviewProvider {