Fix "Official Community" link, Improve navigation routing pattern

Mlem/Extensions/Navigation getter.swift

@@ -24,11 +24,11 @@ extension EnvironmentValues {
 // MARK: - Mlem NavigationRoute
 
 private struct NavigationPathWithRoutes: EnvironmentKey {
-    static let defaultValue: Binding<[NavigationRoute]> = .constant([])
+    static let defaultValue: Binding<[AppRoute]> = .constant([])
 }
 
 extension EnvironmentValues {
-    var navigationPathWithRoutes: Binding<[NavigationRoute]> {
+    var navigationPathWithRoutes: Binding<[AppRoute]> {
         get { self[NavigationPathWithRoutes.self] }
         set { self[NavigationPathWithRoutes.self] = newValue }
     }

Mlem/Extensions/View - Handle Lemmy Links.swift

@@ -10,6 +10,8 @@ import Foundation
 import SwiftUI
 
 struct HandleLemmyLinksDisplay: ViewModifier {
+    @Environment(\.navigationPath) private var navigationPath
+    @EnvironmentObject private var layoutWidgetTracker: LayoutWidgetTracker
     @EnvironmentObject var appState: AppState
     @EnvironmentObject var filtersTracker: FiltersTracker
 
@@ -18,9 +20,10 @@ struct HandleLemmyLinksDisplay: ViewModifier {
     @AppStorage("upvoteOnSave") var upvoteOnSave = false
 
     // swiftlint:disable function_body_length
+    // swiftlint:disable:next cyclomatic_complexity
     func body(content: Content) -> some View {
         content
-            .navigationDestination(for: NavigationRoute.self) { route in
+            .navigationDestination(for: AppRoute.self) { route in
                 switch route {
                 case .apiCommunity(let community):
                     FeedView(community: community, feedType: .all, sortType: defaultPostSorting)
@@ -70,13 +73,108 @@ struct HandleLemmyLinksDisplay: ViewModifier {
                 case .userModeratorLink(let user):
                     UserModeratorView(userDetails: user.user, moderatedCommunities: user.moderatedCommunities)
                         .environmentObject(appState)
+                case .settings(let page):
+                    settingsDestination(for: page)
+                case .aboutSettings(let page):
+                    aboutSettingsDestination(for: page)
+                case .appearanceSettings(let page):
+                    appearanceSettingsDestination(for: page)
+                case .commentSettings(let page):
+                    commentSettingsDestination(for: page)
+                case .postSettings(let page):
+                    postSettingsDestination(for: page)
+                case .licenseSettings(let page):
+                    licensesSettingsDestination(for: page)
                 }
             }
     }
     // swiftlint:enable function_body_length
+
+    @ViewBuilder
+    private func settingsDestination(for page: SettingsPage) -> some View {
+        switch page {
+        case .accounts:
+            AccountsPage()
+        case .general:
+            GeneralSettingsView()
+        case .accessibility:
+            AccessibilitySettingsView()
+        case .appearance:
+            AppearanceSettingsView()
+        case .contentFilters:
+            FiltersSettingsView()
+        case .about:
+            AboutView(navigationPath: navigationPath)
+        case .advanced:
+            AdvancedSettingsView()
+        }
+    }
+
+    @ViewBuilder
+    private func aboutSettingsDestination(for page: AboutSettingsPage) -> some View {
+        switch page {
+        case .contributors:
+            ContributorsView()
+        case let .document(doc):
+            DocumentView(text: doc.body)
+        case .licenses:
+            LicensesView()
+        }
+    }
+
+    @ViewBuilder
+    private func appearanceSettingsDestination(for page: AppearanceSettingsPage) -> some View {
+        switch page {
+        case .theme:
+            ThemeSettingsView()
+        case .appIcon:
+            IconSettingsView()
+        case .posts:
+            PostSettingsView()
+        case .comments:
+            CommentSettingsView()
+        case .communities:
+            CommunitySettingsView()
+        case .users:
+            UserSettingsView()
+        case .tabBar:
+            TabBarSettingsView()
+        }
+    }
+
+    @ViewBuilder
+    private func commentSettingsDestination(for page: CommentSettingsPage) -> some View {
+        switch page {
+        case .layoutWidget:
+            LayoutWidgetEditView(widgets: layoutWidgetTracker.groups.comment, onSave: { widgets in
+                layoutWidgetTracker.groups.comment = widgets
+                layoutWidgetTracker.saveLayoutWidgets()
+            })
+        }
+    }
+
+    @ViewBuilder
+    private func postSettingsDestination(for page: PostSettingsPage) -> some View {
+        switch page {
+        case .customizeWidgets:
+            /// We really should be passing in the layout widget through the route enum value, but that would involve making layout widget tracker hashable and codable.
+            LayoutWidgetEditView(widgets: layoutWidgetTracker.groups.post, onSave: { widgets in
+                layoutWidgetTracker.groups.post = widgets
+                layoutWidgetTracker.saveLayoutWidgets()
+            })
+        }
+    }
+
+    @ViewBuilder
+    private func licensesSettingsDestination(for page: LicensesSettingsPage) -> some View {
+        switch page {
+        case let .licenseDocument(doc):
+            DocumentView(text: doc.body)
+        }
+    }
 }
 
-struct HandleLemmyLinkResolution<Path: AnyNavigationPath>: ViewModifier {
+struct HandleLemmyLinkResolution<Path: AnyNavigablePath>: ViewModifier {
     @Dependency(\.apiClient) var apiClient
     @Dependency(\.errorHandler) var errorHandler
     @Dependency(\.notifier) var notifier
@@ -180,7 +278,7 @@ extension View {
         modifier(HandleLemmyLinksDisplay())
     }
 
-    func handleLemmyLinkResolution<P: AnyNavigationPath>(navigationPath: Binding<P>) -> some View {
+    func handleLemmyLinkResolution<P: AnyNavigablePath>(navigationPath: Binding<P>) -> some View {
         modifier(HandleLemmyLinkResolution(navigationPath: navigationPath))
     }
 }

Mlem/Navigation/AnyNavigablePath.swift

@@ -0,0 +1,31 @@
+//
+//  AnyNavigablePath.swift
+//  Mlem
+//
+//  Created by Bosco Ho on 2023-09-08.
+//
+
+import Foundation
+import SwiftUI
+
+protocol AnyNavigablePath {
+
+    associatedtype Route: Routable
+
+    /// Implementation should make a route that makes sense for the passed-in data value and can be appended to the navigation path.
+    static func makeRoute<V>(_ value: V) throws -> Route where V: Hashable
+
+    /// The number of elements in this path.
+    var count: Int { get }
+
+    /// A Boolean that indicates whether this path is empty.
+    var isEmpty: Bool { get }
+
+    /// Appends a new value to the end of this path.
+    mutating func append<V>(_ value: V) where V: Routable
+
+    // swiftlint:disable identifier_name
+    /// Removes values from the end of this path.
+    mutating func removeLast(_ k: Int)
+    // swiftlint:enable identifier_name
+}

Mlem/Navigation/AnyNavigationPath.swift

@@ -6,26 +6,45 @@
 //
 
 import Foundation
-import SwiftUI
 
-protocol AnyNavigationPath {
+/// For when the system `NavigationPath` doesn't meet your needs.
+///
+/// Technical Note:
+/// - [2023.09] Initially, enum-based navigation routes were added during the development of tab-bar navigation. When using the system `NavigationPath`, the UI would exhibit a bug where views would randomly push onto view without any animations, after which the navigation path became corrupt, making programmatic navigation unreliable. Using enum-based navigation routes with custom navigation paths resulted in this issue disappearing on both iOS 16/17.
+final class AnyNavigationPath<RouteValue: Routable>: ObservableObject {
 
-    associatedtype Route: Routable
+    /// - Avoid directly manipulating this value, if alternate methods are provided.
+    @Published var path: [RouteValue] = []
 
-    /// Implementation should make a route that makes sense for the passed-in data value and can be appended to the navigation path.
-    static func makeRoute<V>(_ value: V) throws -> Route where V: Hashable
+}
+
+extension AnyNavigationPath: AnyNavigablePath {
+
+    typealias Route = RouteValue
+
+    static func makeRoute<V>(_ value: V) throws -> Route where V: Hashable {
+        try RouteValue.makeRoute(value)
+    }
 
-    /// The number of elements in this path.
-    var count: Int { get }
+    var count: Int {
+        path.count
+    }
 
-    /// A Boolean that indicates whether this path is empty.
-    var isEmpty: Bool { get }
+    var isEmpty: Bool {
+        path.isEmpty
+    }
 
-    /// Appends a new value to the end of this path.
-    mutating func append<V>(_ value: V) where V: Routable
+    func append<V>(_ value: V) where V: Routable {
+        guard let route = value as? Route else {
+            assert(value is Route)
+            return
+        }
+        path.append(route)
+    }
 
     // swiftlint:disable identifier_name
-    /// Removes values from the end of this path.
-    mutating func removeLast(_ k: Int)
+    func removeLast(_ k: Int = 1) {
+        path.removeLast(k)
+    }
     // swiftlint:enable identifier_name
 }

Mlem/Navigation/Destination Values/DestinationValue.swift

@@ -0,0 +1,20 @@
+//
+//  DestinationValue.swift
+//  Mlem
+//
+//  Created by Bosco Ho on 2023-09-26.
+//
+
+import Foundation
+
+/// Essentially a cheap "view-model", wrap `DestinationValue` inside a `Routable` value, then use that value as the data to define navigation destinations.
+///
+/// Conforming types can be used to drive value-based navigation for destinations that are defined semantically or are not (yet) mapped to a particular data-type or view model.
+///
+/// For example: 
+/// - Many `Settings` views are presented based on their purpose and not the data they present.
+/// - In this scenario, we can define a set of semantically named enum cases (i.e. `.general` or `.about`), and treat these enum cases as values that drive navigation.
+/// - See `AppRoute` settings routes for an example implementation.
+///
+/// - Warning: Avoid directly adding `DestinationValue` to a navigation path or using them as data to define `navigationDestination(...)`.
+protocol DestinationValue: Hashable {}

Mlem/Navigation/Destination Values/SettingsValues.swift

@@ -0,0 +1,47 @@
+//
+//  SettingsRoutes.swift
+//  Mlem
+//
+//  Created by Bosco Ho on 2023-08-18.
+//
+
+import Foundation
+
+enum SettingsPage: DestinationValue {
+    case accounts
+    case general
+    case accessibility
+    case appearance
+    case contentFilters
+    case about
+    case advanced
+}
+
+enum AboutSettingsPage: DestinationValue {
+    case contributors
+    /// e.g. `Privacy Policy` or `EULA`.
+    case document(Document)
+    case licenses
+}
+
+enum AppearanceSettingsPage: DestinationValue {
+    case theme
+    case appIcon
+    case posts
+    case comments
+    case communities
+    case users
+    case tabBar
+}
+
+enum CommentSettingsPage: DestinationValue {
+    case layoutWidget
+}
+
+enum PostSettingsPage: DestinationValue {
+    case customizeWidgets
+}
+
+enum LicensesSettingsPage: DestinationValue {
+    case licenseDocument(Document)
+}

Mlem/Navigation/NavigationLink+Helpers.swift

@@ -10,7 +10,7 @@ import SwiftUI
 extension NavigationLink where Destination == Never {
 
     /// Convenience initializer.
-    init(_ route: NavigationRoute, @ViewBuilder label: () -> Label) {
+    init(_ route: AppRoute, @ViewBuilder label: () -> Label) {
         self = .init(value: route, label: label)
     }
 }