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Swift: macOS files and application state

Swift 5.9+ on macOS 14+: persisted app state, security-scoped files, bookmarks, cancellable debounce and Foundation parsing. Review names and integration points before use.

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;sw-httpjson

Decode JSON only after checking HTTP status

import Foundation enum HTTPPayloadError: Error { case nonHTTPResponse case status(Int) } f

;sw-query

Add URL query values without string concatenation

import Foundation func appendingQueryItems( _ items: [URLQueryItem], to url: URL ) throws -> UR

;sw-jsonfile

Encode JSON before replacing a local file

import Foundation func writeJSONAtomically<Value: Encodable>( _ value: Value, to destination: U

;sw-utc-stamp

Parse internet timestamps with optional fractional seconds

import Foundation func parseInternetTimestamp(_ text: String) -> Date? { let formatter = ISO860

;sw-batches

Split an array into bounded batches

enum BatchSizeError: Error { case nonPositive } func batches<Element>( of values: [Element], si

;sw-unique

Remove duplicate values while keeping first occurrence order

func uniqueInOrder<Element: Hashable>( _ values: [Element] ) -> [Element] { var seen = Set<E

;sw-capture

Read a regex capture using safe String indices

import Foundation func firstCapture( in text: String, pattern: String, group: Int = 1 ) throws

;sw-readfile

Read a local file with an explicit size limit

import Foundation enum BoundedFileError: Error { case invalidLimit, tooLarge } func readBoundedFil

;sw-statestore

Serialize app-state edits and persist before committing in memory

import Foundation actor JSONStateStore<Value: Codable & Sendable> { private var value: Value

;sw-bookmark

Resolve a saved file bookmark and report whether it is stale

import Foundation struct ResolvedFileBookmark { let url: URL let needsRefresh: Bool } func

;sw-scopedaccess

Balance security-scoped access around a file operation

import Foundation func withSecurityScopedAccess<Result>( to url: URL, operation: (URL) throws -

;sw-debounce

Debounce a search or autosave task with explicit cancellation

actor TaskDebouncer { private var pending: Task<Void, Never>? @discardableResult func s