ytyubox

import Combine

func aPublisher() -> some Publisher {
    Just(1)
}

protocol IntNeverPublisher: Publisher where Output == Int, Failure == Never { }
extension Just: IntNeverPublisher where Output == Int {}

func aIntNeverPublisher() -> some IntNeverPublisher {

ytyubox

import Combine
final class DeviceOrientation: ObservableObject {
    @Published private(set) var orientation = UIDevice.current.orientation
    private var listener: AnyCancellable?
    init() {
        orientation = UIDevice.current.orientation
        print(orientation.isPortrait)
        listener = NotificationCenter.default.publisher(for: UIDevice.orientationDidChangeNotification)
            .compactMap { ($0.object as? UIDevice)?.orientation }
            .compactMap{

ytyubox

Before

  Text("Hello")
  Text("world")

After apply <Leader>ai on both line selected by V

👇 cursor here

ytyubox

XCTAssertEqual + Tuple Keypath

GYB to Swift code

//bash
gyb XCTAssertEqual+TupleKeypath.swift.gyb --line-directive "" -o XCTAssertEqual+TupleKeypath.swift

Usage

ytyubox

import UIKit
class AutoUpdateColor: UIColor {
    convenience init(lightColor: UIColor, darkColor: UIColor) {
        if #available(iOS 13.0, *) {
            self.init {
                traitCollection in
                traitCollection.userInterfaceStyle == .dark
                    ? darkColor 
                    : lightColor
            }

ytyubox

before execute, gen xcode project by

swift package generate-xcodeproj

and configure the build setting as you need

then excute the script with two argument

1. the name of .xcodeproj
2. the sheme to gen (may be different due to auto generate xcode project)

ytyubox

@propertyWrapper struct MustInjected<Value> {
    private var _value: Value! = nil
    #if DEBUG
    let line: UInt
    let file: StaticString
    #endif
    @available(*, unavailable)
    init(wrappedValue: @autoclosure @escaping () -> Value) {
        self._value = nil
        line = #line

ytyubox

import XCTest
enum XCTGetIndexError: Error {
    case outofRange
}
func XCTGetIndex<C, T>(
    _ array: C, with index: C.Index,
    _ message: @autoclosure () -> String = "Index out of range",
    file: StaticString = #file,
    line: UInt = #line) throws -> T
where C: RandomAccessCollection, C.Element == T

ytyubox

struct HardCodedString: ExpressibleByStringLiteral, CustomStringConvertible {
    private var backing: String
    @available(*, deprecated, message: "This method was used by compiler, you should not call directly")
    init(stringLiteral value: String) {
        self.backing = value
    }
    var description: String {backing}
    
}

ytyubox

import XCTest
final class TwitterMathProbramTests: XCTestCase {
    func testBFS() throws {
        var q = (1 ..< 10).map(\.description)
        var res = [String]()
        var cur = ""
        while true {
            if q.isEmpty { break }
            cur = q.removeFirst()
            if cur.count == 10 {