Add Reposts view

Changelog-Added: Reposts view
Closes: #376

damus/Models/RepostsModel.swift

@@ -0,0 +1,77 @@
+//
+//  RepostsModel.swift
+//  damus
+//
+//  Created by Terry Yiu on 1/22/23.
+//
+
+import Foundation
+
+class RepostsModel: ObservableObject {
+    let state: DamusState
+    let target: String
+    let sub_id: String
+    let profiles_id: String
+
+    @Published var reposts: [NostrEvent]
+
+    init (state: DamusState, target: String) {
+        self.state = state
+        self.target = target
+        self.sub_id = UUID().description
+        self.profiles_id = UUID().description
+        self.reposts = []
+    }
+
+    func get_filter() -> NostrFilter {
+        var filter = NostrFilter.filter_kinds([NostrKind.boost.rawValue])
+        filter.referenced_ids = [target]
+        filter.limit = 500
+        return filter
+    }
+
+    func subscribe() {
+        let filter = get_filter()
+        let filters = [filter]
+        self.state.pool.subscribe(sub_id: sub_id, filters: filters, handler: handle_nostr_event)
+    }
+
+    func unsubscribe() {
+        self.state.pool.unsubscribe(sub_id: sub_id)
+    }
+
+    func handle_event(relay_id: String, ev: NostrEvent) {
+        guard ev.kind == NostrKind.boost.rawValue else {
+            return
+        }
+
+        guard let reposted_event = last_etag(tags: ev.tags) else {
+            return
+        }
+
+        guard reposted_event == self.target else {
+            return
+        }
+
+        if insert_uniq_sorted_event(events: &self.reposts, new_ev: ev, cmp: { a, b in a.created_at < b.created_at } ) {
+            objectWillChange.send()
+        }
+    }
+
+    func handle_nostr_event(relay_id: String, ev: NostrConnectionEvent) {
+        guard case .nostr_event(let nev) = ev else {
+            return
+        }
+
+        switch nev {
+        case .event(_, let ev):
+            handle_event(relay_id: relay_id, ev: ev)
+
+        case .notice(_):
+            break
+        case .eose(_):
+            load_profiles(profiles_subid: profiles_id, relay_id: relay_id, events: reposts, damus_state: state)
+            break
+        }
+    }
+}

damus/Views/ActionBar/EventDetailBar.swift

@@ -15,7 +15,10 @@ struct EventDetailBar: View {
     var body: some View {
         HStack {
             if bar.boosts > 0 {
-                Text("\(Text("\(bar.boosts)", comment: "Number of reposts.").font(.body.bold())) \(Text(String(format: NSLocalizedString("reposts_count", comment: "Part of a larger sentence to describe how many reposts there are."), bar.boosts)).foregroundColor(.gray))", comment: "Sentence composed of 2 variables to describe how many reposts. In source English, the first variable is the number of reposts, and the second variable is 'Repost' or 'Reposts'.")
+                NavigationLink(destination: RepostsView(damus_state: state, model: RepostsModel(state: state, target: target))) {
+                    Text("\(Text("\(bar.boosts)", comment: "Number of reposts.").font(.body.bold())) \(Text(String(format: NSLocalizedString("reposts_count", comment: "Part of a larger sentence to describe how many reposts there are."), bar.boosts)).foregroundColor(.gray))", comment: "Sentence composed of 2 variables to describe how many reposts. In source English, the first variable is the number of reposts, and the second variable is 'Repost' or 'Reposts'.")
+                }
+                .buttonStyle(PlainButtonStyle())
             }
 
             if bar.likes > 0 {

damus/Views/Reposts/RepostView.swift

@@ -0,0 +1,24 @@
+//
+//  RepostView.swift
+//  damus
+//
+//  Created by Terry Yiu on 1/22/23.
+//
+
+import SwiftUI
+
+struct RepostView: View {
+    let damus_state: DamusState
+    let repost: NostrEvent
+
+    var body: some View {
+        FollowUserView(target: .pubkey(repost.pubkey), damus_state: damus_state)
+    }
+}
+
+struct RepostView_Previews: PreviewProvider {
+    static var previews: some View {
+        RepostView(damus_state: test_damus_state(), repost: NostrEvent(id: "", content: "", pubkey: ""))
+    }
+}
+

damus/Views/RepostsView.swift

@@ -0,0 +1,38 @@
+//
+//  RepostsView.swift
+//  damus
+//
+//  Created by Terry Yiu on 1/22/23.
+//
+
+import SwiftUI
+
+struct RepostsView: View {
+    let damus_state: DamusState
+    @StateObject var model: RepostsModel
+
+    var body: some View {
+        ScrollView {
+            LazyVStack {
+                ForEach(model.reposts, id: \.id) { ev in
+                    RepostView(damus_state: damus_state, repost: ev)
+                }
+            }
+            .padding()
+        }
+        .navigationBarTitle(NSLocalizedString("Reposts", comment: "Navigation bar title for Reposts view."))
+        .onAppear {
+            model.subscribe()
+        }
+        .onDisappear {
+            model.unsubscribe()
+        }
+    }
+}
+
+struct RepostsView_Previews: PreviewProvider {
+    static var previews: some View {
+        let state = test_damus_state()
+        RepostsView(damus_state: state, model: RepostsModel(state: state, target: "pubkey"))
+    }
+}