davbeck

import Combine
import SwiftUI
import WebKit

@Observable final class WebViewContent: NSObject {
	let id = UUID()

	var url: URL?

	var title: String?

davbeck

import ConcurrencyExtras

private struct ObservationTrackingState: Sendable {
	var isCancelled: Bool = false
	var updateTaskID: UUID?
}

public func withObservationTracking<T>(_ apply: @escaping () -> T) -> AsyncThrowingStream<T, any Error> {
	let (stream, continuation) = AsyncThrowingStream.makeStream(of: T.self)

davbeck

import Foundation

// Foundation.CharacterSet should be called "UnicodeScalarSet"
// this operates on actual Characters

// TODO: Equatable doesn't work right: for instance defining a range vs defining a set with the same values will not be equal

indirect enum CharacterSet: Sendable, Hashable {
    case closedRange(ClosedRange<Character>)
    case set(Set<Character>)

davbeck

// example of what the macros could be expanded into for XCTestCase
final class PostsCoordinatorTests: XCTestCase {
  func test_addPost() async throws {
    let coordinator = PostsCoordinator()

		coordinator.createPost()
		XCTAssert(coordinator.postCount == 1)
	}

  func test_hasExistingPosts_countsPosts() async throws {

davbeck

import Foundation

struct Weak<Value: AnyObject> {
	weak var value: Value?

	init(_ value: Value) {
		self.value = value
	}
}

davbeck

import UIKit
import Combine

public extension Task {
	/// Keep a reference to a task that can be cancelled.
	func store(in set: inout Set<AnyCancellable>) {
		set.insert(AnyCancellable {
			self.cancel()
		})
	}

davbeck

	func fetch<Result: Codable>(_ endpoint: Endpoint<Result>, cacheBehavior: CacheBehavior = .cacheElseNetwork) async throws -> Result {
		switch cacheBehavior {
		case .cacheElseNetwork:
			if let cached = self.cache[endpoint.cacheKey] {
				return cached.payload
			} else {
				return try await self.networkFetch(endpoint)
			}
		case .networkOnly:
			return try await self.networkFetch(endpoint)

davbeck

import SwiftUI

func ?? <T>(optional: Binding<T?>, defaultValue: @escaping @autoclosure () -> T) -> Binding<T> {
	return Binding {
		optional.wrappedValue ?? defaultValue()
	} set: { newValue in
		optional.wrappedValue = newValue
	}
}

davbeck

struct ContentView: View {
	var text: Text {
		Text("Bacon ipsum dolor amet fatback rump beef ribs jerky pork loin strip steak.")
			.font(.headline) +
		Text("\nCorned beef t-bone leberkas ball tip tongue burgdoggen picanha swine porchetta flank hamburger strip steak tail pork. Filet mignon prosciutto venison tongue meatball shankle pancetta. Hamburger prosciutto turkey chicken venison tenderloin porchetta spare ribs burgdoggen cupim pork turducken. Short ribs andouille kielbasa short loin beef. Ham kevin pork loin bacon, pastrami turducken jowl pig venison pork shank beef picanha.")
			.font(.body)
	}
	
	var body: some View {
		text

davbeck

struct Child: View {
    var count: Int
    
    var body: some View {
        Text("Child: \(count)")
            .useEffect(Int(floor(Double(count) / 2))) { source in
                // this only gets called when the source changes
                print("onAppear \(source)")
            }
    }