Prototyping SwiftUI utilities

Sources/ListReader.swift

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+//
+//  ListReader.swift
+//  CoreStore
+//
+//  Copyright © 2021 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+#if canImport(Combine) && canImport(SwiftUI)
+
+import Combine
+import SwiftUI
+
+
+// MARK: - ListReader
+
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
+public struct ListReader<Object: DynamicObject, Content: View, Value>: View {
+    
+    // MARK: Internal
+    
+    public init(
+        _ listPublisher: ListPublisher<Object>,
+        @ViewBuilder content: @escaping (Value) -> Content
+    ) where Value == LiveList<Object>.Items {
+        
+        self._list = .init(listPublisher)
+        self.content = content
+        self.keyPath = \.self
+    }
+    
+    public init(
+        _ listPublisher: ListPublisher<Object>,
+        keyPath: KeyPath<LiveList<Object>.Items, Value>,
+        @ViewBuilder content: @escaping (Value) -> Content
+    ) {
+        
+        self._list = .init(listPublisher)
+        self.content = content
+        self.keyPath = keyPath
+    }
+    
+    
+    // MARK: View
+    
+    public var body: some View {
+        
+        self.content(self.list[keyPath: self.keyPath])
+    }
+    
+    
+    // MARK: Private
+    
+    @LiveList
+    private var list: LiveList<Object>.Items
+    
+    private let content: (Value) -> Content
+    private let keyPath: KeyPath<LiveList<Object>.Items, Value>
+}
+
+#endif