native macOS codings agent orchestrator prowl.onev.cat
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Swift
at main
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/// Reads and writes the app language choice in the per-app `AppleLanguages` default, the/// key that Foundation and AppKit consult at launch.////// macOS writes the same key from System Settings → Language & Region → Applications, so/// the Settings picker and System Settings always show one value and the last change/// wins. Prowl keeps no second copy of the choice, which leaves nothing to reconcile.////// Only the app domain is written (Debug and Release have separate bundle domains). The/// global domain and other apps are never written.nonisolated struct AppLanguageStore { static let appleLanguagesKey = "AppleLanguages"
let defaults: UserDefaults /// The persistent domain of the app. Reads go through `persistentDomain(forName:)` so a /// command-line `-AppleLanguages` argument, which lives in the argument domain for one /// launch, is never mistaken for the saved choice. let domainName: String
var appleLanguages: [String]? { defaults.persistentDomain(forName: domainName)?[Self.appleLanguagesKey] as? [String] }
var language: AppLanguage { AppLanguage(appleLanguages: appleLanguages) }
func setLanguage(_ language: AppLanguage) { if let appleLanguages = language.appleLanguages { defaults.set(appleLanguages, forKey: Self.appleLanguagesKey) } else { defaults.removeObject(forKey: Self.appleLanguagesKey) } }
/// The system languages, without the per-app override. `Locale.preferredLanguages` cannot /// be used: it already has the override applied. static func systemLanguages(defaults: UserDefaults = .standard) -> [String] { defaults.persistentDomain(forName: UserDefaults.globalDomain)?[appleLanguagesKey] as? [String] ?? [] }}
nonisolated struct AppLanguageClient: Sendable { var current: @Sendable () -> AppLanguage = { .system } var set: @Sendable (_ language: AppLanguage) -> Void = { _ in } var systemLanguages: @Sendable () -> [String] = { [] }}
extension AppLanguageClient: DependencyKey { static let liveValue: AppLanguageClient = { guard let domainName = Bundle.main.bundleIdentifier else { return AppLanguageClient() } return AppLanguageClient( current: { AppLanguageStore(defaults: .standard, domainName: domainName).language }, set: { AppLanguageStore(defaults: .standard, domainName: domainName).setLanguage($0) }, systemLanguages: { AppLanguageStore.systemLanguages() } ) }()
static let testValue = AppLanguageClient()}
extension DependencyValues { var appLanguage: AppLanguageClient { get { self[AppLanguageClient.self] } set { self[AppLanguageClient.self] = newValue } }}