Finish extraction

- Moves SwiftUI code out of Riot and into RiotSwiftUI which has no dependency on Matrix SDK.
- Git wasn't smart enough to see the file moves. Most feature function has remain unchanged. 1 change I did make was remove NotificationSettingsViewModel's dependence on MxPushRule, so that the view model could be moved into RiotSwiftUI.
- Add LocaleProvider to abstract VectorL10n's use of Matrix SDK language so it can be used in RiotSwiftUI.
- Split Theme into UKit/SwiftUI version to remove RiotSwiftUI's dependence on ThemeService and ThemeV1.
- Migrated from ThemeObserver to ThemePublisher. We push updates to ThemePublisher so that we can remove ThemeService as dependency.
- Add .DS_Store to .gitignore

RiotSwiftUI/Modules/Common/DependencyInjection/DependencyContainer.swift

@@ -0,0 +1,48 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+/**
+ Used for storing and resolving dependencies at runtime.
+ */
+struct DependencyContainer {
+    
+    // Stores the dependencies with type information removed.
+    private var dependencyStore: [String: Any] = [:]
+    
+    /**
+     Resolve a dependency by type.
+     Given a particlar `Type` (Inferred from return type),
+     generate a key and retrieve from storage.
+     */
+    func resolve<T>() -> T {
+        let key = String(describing: T.self)
+        guard let t = dependencyStore[key] as? T else {
+            fatalError("No provider registered for type \(T.self)")
+        }
+        return t
+    }
+    
+    /**
+     Register a dependency.
+     Given a dependency, generate a key from it's `Type` and save in storage.
+     */
+    mutating func register<T>(dependency: T) {
+        let key = String(describing: T.self)
+        dependencyStore[key] = dependency
+    }
+}

RiotSwiftUI/Modules/Common/DependencyInjection/DependencyContainerKey.swift

@@ -0,0 +1,50 @@
+//
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import SwiftUI
+
+/**
+ An Environment Key for retrieving runtime dependencies to be injected into `ObservableObjects`
+ that are owned by a View (i.e. `@StateObject`'s, such as ViewModels owned by the View).
+ */
+private struct DependencyContainerKey: EnvironmentKey {
+    static let defaultValue = DependencyContainer()
+}
+
+@available(iOS 14.0, *)
+extension EnvironmentValues {
+    var dependencies: DependencyContainer {
+        get { self[DependencyContainerKey.self] }
+        set { self[DependencyContainerKey.self] = newValue }
+    }
+}
+
+@available(iOS 14.0, *)
+extension View {
+    
+    /**
+     A modifier for adding a dependency to the SwiftUI view hierarchy's dependency container.
+     Important: When adding a dependency to cast it to the type in which it will be injected.
+     So if adding `MockDependency` but type at injection is `Dependency` remember to cast
+     to `Dependency` first.
+     */
+    func addDependency<T>(_ dependency: T) -> some View {
+        transformEnvironment(\.dependencies) { container in
+            container.register(dependency: dependency)
+        }
+    }
+}

RiotSwiftUI/Modules/Common/DependencyInjection/Inject.swift

@@ -0,0 +1,46 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+/**
+ A property wrapped used to inject from the dependency
+ container on the instance to instance properties.
+ E.g. ```@Inject var someClass: SomeClass```
+ */
+@propertyWrapper struct Inject<Value> {
+    
+    static subscript<T: Injectable>(
+        _enclosingInstance instance: T,
+        wrapped wrappedKeyPath: ReferenceWritableKeyPath<T, Value>,
+        storage storageKeyPath: ReferenceWritableKeyPath<T, Self>
+    ) -> Value {
+        get {
+            // Resolve dependencies from enclosing instance's `dependencies` property
+            let v: Value = instance.dependencies.resolve()
+            return v
+        }
+        set {
+            fatalError("Only subscript get is supported for injection")
+        }
+    }
+    
+    @available(*, unavailable, message:  "This property wrapper can only be applied to classes")
+    var wrappedValue: Value {
+        get { fatalError("wrappedValue get not used") }
+        set { fatalError("wrappedValue set not used. \(newValue)" ) }
+    }
+}

RiotSwiftUI/Modules/Common/DependencyInjection/Injectable.swift

@@ -0,0 +1,34 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+/**
+ A protocol for classes that can be injected with a dependency container
+ */
+protocol Injectable: AnyObject {
+    var dependencies: DependencyContainer! { get set }
+}
+
+
+extension Injectable {
+    /**
+     Used to inject the dependency container into an Injectable.
+     */
+    func inject(dependencies: DependencyContainer) {
+        self.dependencies = dependencies
+    }
+}

RiotSwiftUI/Modules/Common/DependencyInjection/InjectableObject.swift

@@ -0,0 +1,25 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+/**
+ Class that can be extended and supports
+ injection and the `@Inject` property wrapper.
+ */
+open class InjectableObject: Injectable {
+    var dependencies: DependencyContainer!
+}