Add toast error messages to menu actions

Tusker/Screens/Utilities/Previewing.swift

@@ -139,8 +139,15 @@ extension MenuActionProvider {
                 guard let self = self else { return }
                 let request = (bookmarked ? Status.unbookmark : Status.bookmark)(status.id)
                 self.mastodonController?.run(request) { (response) in
-                    if case let .success(status, _) = response {
+                    switch response {
+                    case .success(let status, _):
                         self.mastodonController?.persistentContainer.addOrUpdate(status: status)
+                        
+                    case .failure(let error):
+                        if let toastable = self.toastableViewController {
+                            let config = ToastConfiguration(from: error, with: "Error \(bookmarked ? "Unb" : "B")ookmarking", in: toastable, retryAction: nil)
+                            toastable.showToast(configuration: config, animated: true)
+                        }
                     }
                 }
             }),
@@ -161,8 +168,14 @@ extension MenuActionProvider {
                     guard let self = self else { return }
                     let request = (muted ? Status.unmuteConversation : Status.muteConversation)(status.id)
                     self.mastodonController?.run(request) { (response) in
-                        if case let .success(status, _) = response {
+                        switch response {
+                        case .success(let status, _):
                             self.mastodonController?.persistentContainer.addOrUpdate(status: status)
+                        case .failure(let error):
+                            if let toastable = self.toastableViewController {
+                                let config = ToastConfiguration(from: error, with: "Error \(muted ? "Unm" : "M")uting", in: toastable, retryAction: nil)
+                                toastable.showToast(configuration: config, animated: true)
+                            }
                         }
                     }
                 }))
@@ -177,8 +190,14 @@ extension MenuActionProvider {
                     let request = (pinned ? Status.unpin : Status.pin)(status.id)
                     self.mastodonController?.run(request, completion: { [weak self] (response) in
                         guard let self = self else { return }
-                        if case let .success(status, _) = response {
+                        switch response {
+                        case .success(let status, _):
                             self.mastodonController?.persistentContainer.addOrUpdate(status: status)
+                        case .failure(let error):
+                            if let toastable = self.toastableViewController {
+                                let config = ToastConfiguration(from: error, with: "Error \(pinned ? "Unp" :"P")inning", in: toastable, retryAction: nil)
+                                toastable.showToast(configuration: config, animated: true)
+                            }
                         }
                     })
                 }))
@@ -190,10 +209,16 @@ extension MenuActionProvider {
                 guard let mastodonController = self?.mastodonController else { return }
                 let request = Client.getStatus(id: status.id)
                 mastodonController.run(request, completion: { (response) in
-                    if case let .success(status, _) = response {
+                    switch response {
+                    case .success(let status, _):
                         // todo: this shouldn't really use the viewContext, but for some reason saving the
                         // backgroundContext with the new version of the status isn't updating the viewContext
                         mastodonController.persistentContainer.addOrUpdate(status: status, context: mastodonController.persistentContainer.viewContext)
+                    case .failure(let error):
+                        if let toastable = self?.toastableViewController {
+                            let config = ToastConfiguration(from: error, with: "Error Refreshing Poll", in: toastable, retryAction: nil)
+                            toastable.showToast(configuration: config, animated: true)
+                        }
                     }
                 })
             }), at: 0)
@@ -283,8 +308,11 @@ extension MenuActionProvider {
             let request = (following ? Account.unfollow : Account.follow)(accountID)
             mastodonController.run(request) { response in
                 switch response {
-                case .failure(_):
+                case .failure(let error):
-                    fatalError()
+                    if let toastable = self.toastableViewController {
+                        let config = ToastConfiguration(from: error, with: "Error \(following ? "Unf" : "F")ollowing", in: toastable, retryAction: nil)
+                        toastable.showToast(configuration: config, animated: true)
+                    }
                 case .success(let relationship, _):
                     mastodonController.persistentContainer.addOrUpdate(relationship: relationship)
                 }

Tusker/Views/Toast/ToastConfiguration.swift

@@ -35,12 +35,14 @@ struct ToastConfiguration {
 }
 
 extension ToastConfiguration {
-    init(from error: Client.Error, with title: String, in viewController: UIViewController, retryAction: @escaping (ToastView) -> Void) {
+    init(from error: Client.Error, with title: String, in viewController: UIViewController, retryAction: ((ToastView) -> Void)?) {
         self.init(title: title)
         self.subtitle = error.localizedDescription
         self.systemImageName = error.systemImageName
-        self.actionTitle = "Retry"
+        if let retryAction = retryAction {
-        self.action = retryAction
+            self.actionTitle = "Retry"
+            self.action = retryAction
+        }
         self.longPressAction = { [unowned viewController] toast in
             toast.dismissToast(animated: true)
             let text = """