Replying

DB/Sources/DB/Entities/CollectionItem.swift

@@ -54,4 +54,13 @@ public extension CollectionItem {
 
 public extension CollectionItem.StatusConfiguration {
     static let `default` = Self(showContentToggled: false, showAttachmentsToggled: false)
+
+    func reply() -> Self {
+        Self(showContentToggled: showContentToggled,
+             showAttachmentsToggled: showAttachmentsToggled,
+             isContextParent: false,
+             isPinned: false,
+             isReplyInContext: false,
+             hasReplyFollowing: true)
+    }
 }

View Controllers/NewStatusViewController.swift

@@ -68,6 +68,18 @@ final class NewStatusViewController: UIViewController {
             self?.viewModel.post()
         }
 
+        #if !IS_SHARE_EXTENSION
+        if let inReplyToViewModel = viewModel.inReplyToViewModel {
+            let statusView = StatusView(configuration: .init(viewModel: inReplyToViewModel))
+
+            statusView.isUserInteractionEnabled = false
+            statusView.bodyView.alpha = 0.5
+            statusView.buttonsStackView.isHidden = true
+
+            stackView.addArrangedSubview(statusView)
+        }
+        #endif
+
         setupViewModelBindings()
     }
 
@@ -145,7 +157,9 @@ private extension NewStatusViewController {
             let compositionView = CompositionView(
                 viewModel: compositionViewModel,
                 parentViewModel: viewModel)
-            stackView.insertArrangedSubview(compositionView, at: index)
+            let adjustedIndex = viewModel.inReplyToViewModel == nil ? index : index + 1
+
+            stackView.insertArrangedSubview(compositionView, at: adjustedIndex)
             compositionView.textView.becomeFirstResponder()
 
             DispatchQueue.main.async {

View Controllers/ProfileViewController.swift

@@ -9,10 +9,10 @@ final class ProfileViewController: TableViewController {
     private let viewModel: ProfileViewModel
     private var cancellables = Set<AnyCancellable>()
 
-    required init(viewModel: ProfileViewModel, identification: Identification) {
+    required init(viewModel: ProfileViewModel, rootViewModel: RootViewModel, identification: Identification) {
         self.viewModel = viewModel
 
-        super.init(viewModel: viewModel, identification: identification)
+        super.init(viewModel: viewModel, rootViewModel: rootViewModel, identification: identification)
     }
 
     override func viewDidLoad() {
@@ -108,7 +108,7 @@ private extension ProfileViewController {
                   let reportViewModel = self.viewModel.accountViewModel?.reportViewModel()
             else { return }
 
-            self.report(viewModel: reportViewModel)
+            self.report(reportViewModel: reportViewModel)
         })
 
         if relationship.blocking {

View Controllers/TableViewController.swift

@@ -6,10 +6,12 @@ import SafariServices
 import SwiftUI
 import ViewModels
 
+// swiftlint:disable file_length
 class TableViewController: UITableViewController {
     var transitionViewTag = -1
 
     private let viewModel: CollectionViewModel
+    private let rootViewModel: RootViewModel
     private let identification: Identification
     private let loadingTableFooterView = LoadingTableFooterView()
     private let webfingerIndicatorView = WebfingerIndicatorView()
@@ -21,8 +23,9 @@ class TableViewController: UITableViewController {
         .init(tableView: tableView, viewModelProvider: viewModel.viewModel(indexPath:))
     }()
 
-    init(viewModel: CollectionViewModel, identification: Identification) {
+    init(viewModel: CollectionViewModel, rootViewModel: RootViewModel, identification: Identification) {
         self.viewModel = viewModel
+        self.rootViewModel = rootViewModel
         self.identification = identification
 
         super.init(style: .plain)
@@ -109,15 +112,6 @@ class TableViewController: UITableViewController {
     }
 }
 
-extension TableViewController {
-    func report(viewModel: ReportViewModel) {
-        let reportViewController = ReportViewController(viewModel: viewModel)
-        let navigationController = UINavigationController(rootViewController: reportViewController)
-
-        present(navigationController, animated: true)
-    }
-}
-
 extension TableViewController: UITableViewDataSourcePrefetching {
     func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
         guard
@@ -132,6 +126,13 @@ extension TableViewController: UITableViewDataSourcePrefetching {
 }
 
 extension TableViewController {
+    func report(reportViewModel: ReportViewModel) {
+        let reportViewController = ReportViewController(viewModel: reportViewModel)
+        let navigationController = UINavigationController(rootViewController: reportViewController)
+
+        present(navigationController, animated: true)
+    }
+
     func sizeTableHeaderFooterViews() {
         // https://useyourloaf.com/blog/variable-height-table-view-header/
         if let headerView = tableView.tableHeaderView {
@@ -299,32 +300,40 @@ private extension TableViewController {
         case let .share(url):
             share(url: url)
         case let .navigation(navigation):
-            switch navigation {
+            handle(navigation: navigation)
-            case let .collection(collectionService):
-                show(TableViewController(
-                        viewModel: CollectionItemsViewModel(
-                            collectionService: collectionService,
-                            identification: identification),
-                        identification: identification),
-                     sender: self)
-            case let .profile(profileService):
-                show(ProfileViewController(
-                        viewModel: ProfileViewModel(
-                            profileService: profileService,
-                            identification: identification),
-                        identification: identification),
-                     sender: self)
-            case let .url(url):
-                present(SFSafariViewController(url: url), animated: true)
-            case .webfingerStart:
-                webfingerIndicatorView.startAnimating()
-            case .webfingerEnd:
-                webfingerIndicatorView.stopAnimating()
-            }
         case let .attachment(attachmentViewModel, statusViewModel):
             present(attachmentViewModel: attachmentViewModel, statusViewModel: statusViewModel)
+        case let .reply(statusViewModel):
+            reply(statusViewModel: statusViewModel)
         case let .report(reportViewModel):
-            report(viewModel: reportViewModel)
+            report(reportViewModel: reportViewModel)
+        }
+    }
+
+    func handle(navigation: Navigation) {
+        switch navigation {
+        case let .collection(collectionService):
+            show(TableViewController(
+                    viewModel: CollectionItemsViewModel(
+                        collectionService: collectionService,
+                        identification: identification),
+                    rootViewModel: rootViewModel,
+                    identification: identification),
+                 sender: self)
+        case let .profile(profileService):
+            show(ProfileViewController(
+                    viewModel: ProfileViewModel(
+                        profileService: profileService,
+                        identification: identification),
+                    rootViewModel: rootViewModel,
+                    identification: identification),
+                 sender: self)
+        case let .url(url):
+            present(SFSafariViewController(url: url), animated: true)
+        case .webfingerStart:
+            webfingerIndicatorView.startAnimating()
+        case .webfingerEnd:
+            webfingerIndicatorView.stopAnimating()
         }
     }
 
@@ -365,6 +374,18 @@ private extension TableViewController {
         }
     }
 
+    func reply(statusViewModel: StatusViewModel) {
+        let newStatusViewModel = rootViewModel.newStatusViewModel(
+            identification: identification,
+            inReplyTo: statusViewModel)
+        let newStatusViewController = UIHostingController(rootView: NewStatusView { newStatusViewModel })
+        let navigationController = UINavigationController(rootViewController: newStatusViewController)
+
+        navigationController.modalPresentationStyle = .overFullScreen
+
+        present(navigationController, animated: true)
+    }
+
     func set(expandAllState: ExpandAllState) {
         switch expandAllState {
         case .hidden:
@@ -388,3 +409,4 @@ private extension TableViewController {
         present(activityViewController, animated: true, completion: nil)
     }
 }
+// swiftlint:enable file_length

ViewModels/Sources/ViewModels/Entities/CollectionItemEvent.swift

@@ -7,6 +7,7 @@ public enum CollectionItemEvent {
     case ignorableOutput
     case navigation(Navigation)
     case attachment(AttachmentViewModel, StatusViewModel)
+    case reply(StatusViewModel)
     case report(ReportViewModel)
     case share(URL)
 }

ViewModels/Sources/ViewModels/Entities/Navigation.swift

@@ -0,0 +1,5 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import ServiceLayer
+
+public typealias Navigation = ServiceLayer.Navigation

ViewModels/Sources/ViewModels/NewStatusViewModel.swift

@@ -14,6 +14,7 @@ public final class NewStatusViewModel: ObservableObject {
     @Published public var canChangeIdentity = true
     @Published public var alertItem: AlertItem?
     @Published public private(set) var postingState = PostingState.composing
+    public let inReplyToViewModel: StatusViewModel?
     public let events: AnyPublisher<Event, Never>
 
     private let allIdentitiesService: AllIdentitiesService
@@ -24,10 +25,12 @@ public final class NewStatusViewModel: ObservableObject {
 
     public init(allIdentitiesService: AllIdentitiesService,
                 identification: Identification,
-                environment: AppEnvironment) {
+                environment: AppEnvironment,
+                inReplyTo: StatusViewModel?) {
         self.allIdentitiesService = allIdentitiesService
         self.identification = identification
         self.environment = environment
+        inReplyToViewModel = inReplyTo
         compositionViewModels = [CompositionViewModel(eventsSubject: compositionEventsSubject)]
         events = eventsSubject.eraseToAnyPublisher()
         visibility = identification.identity.preferences.postingDefaultVisibility
@@ -109,7 +112,7 @@ public extension NewStatusViewModel {
     func post() {
         guard let unposted = compositionViewModels.first(where: { !$0.isPosted }) else { return }
 
-        post(viewModel: unposted, inReplyToId: nil)
+        post(viewModel: unposted, inReplyToId: inReplyToViewModel?.id)
     }
 }
 

ViewModels/Sources/ViewModels/RootViewModel.swift

@@ -58,11 +58,12 @@ public extension RootViewModel {
             instanceURLService: InstanceURLService(environment: environment))
     }
 
-    func newStatusViewModel(identification: Identification) -> NewStatusViewModel {
+    func newStatusViewModel(identification: Identification, inReplyTo: StatusViewModel? = nil) -> NewStatusViewModel {
         NewStatusViewModel(
             allIdentitiesService: allIdentitiesService,
             identification: identification,
-            environment: environment)
+            environment: environment,
+            inReplyTo: inReplyTo)
     }
 }
 

ViewModels/Sources/ViewModels/ShareExtensionNavigationViewModel.swift

@@ -36,6 +36,7 @@ public extension ShareExtensionNavigationViewModel {
         return NewStatusViewModel(
             allIdentitiesService: allIdentitiesService,
             identification: identification,
-            environment: environment)
+            environment: environment,
+            inReplyTo: nil)
     }
 }

ViewModels/Sources/ViewModels/StatusViewModel.swift

@@ -72,6 +72,8 @@ public extension StatusViewModel {
         sensitive || identification.identity.preferences.readingExpandMedia == .hideAll
     }
 
+    var id: Status.Id { statusService.status.displayStatus.id }
+
     var accountName: String { "@".appending(statusService.status.displayStatus.account.acct) }
 
     var avatarURL: URL {
@@ -200,6 +202,14 @@ public extension StatusViewModel {
                 .eraseToAnyPublisher())
     }
 
+    func reply() {
+        let replyViewModel = Self(statusService: statusService, identification: identification)
+
+        replyViewModel.configuration = configuration.reply()
+
+        eventsSubject.send(Just(.reply(replyViewModel)).setFailureType(to: Error.self).eraseToAnyPublisher())
+    }
+
     func toggleReblogged() {
         eventsSubject.send(
             statusService.toggleReblogged()

Views/Status/StatusView.swift

@@ -198,6 +198,10 @@ private extension StatusView {
         interactionsStackView.addArrangedSubview(favoritedByButton)
         interactionsStackView.distribution = .fillEqually
 
+        replyButton.addAction(
+            UIAction { [weak self] _ in self?.statusConfiguration.viewModel.reply() },
+            for: .touchUpInside)
+
         reblogButton.addAction(
             UIAction { [weak self] _ in self?.statusConfiguration.viewModel.toggleReblogged() },
             for: .touchUpInside)

Views/TableView.swift

@@ -5,10 +5,11 @@ import ViewModels
 
 struct TableView: UIViewControllerRepresentable {
     @EnvironmentObject var identification: Identification
+    @EnvironmentObject var rootViewModel: RootViewModel
     let viewModelClosure: () -> CollectionViewModel
 
     func makeUIViewController(context: Context) -> TableViewController {
-        TableViewController(viewModel: viewModelClosure(), identification: identification)
+        TableViewController(viewModel: viewModelClosure(), rootViewModel: rootViewModel, identification: identification)
     }
 
     func updateUIViewController(_ uiViewController: TableViewController, context: Context) {