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)")
            }
    }

davbeck

import Combine
import Foundation
import SwiftUI

class ObservablePublisher<Output>: ObservableObject {
	@Published var output: Output?
	@Published var error: Swift.Error?
	private var observer: AnyCancellable?
	
	init() {}

davbeck

@propertyWrapper
struct IgnoreHashable<T>: Hashable {
	var wrappedValue: T
	
	init(wrappedValue: T) {
		self.wrappedValue = wrappedValue
	}
	
	func hash(into hasher: inout Hasher) {}
	

davbeck

class Loader<Output>: ObservableObject {
	@Published var isLoding: Bool = false
	@Published var error: Swift.Error?
	@Published var value: Output?
	
	private var observer: AnyCancellable?
	
	func load<P: Publisher>(_ publisher: P) where P.Output == Output {
		self.observer?.cancel()
		

davbeck

# remap windows menu/application key to option to avoid hidden characters
# in particular when using the Microsoft ergonomic keyboard 
# I found that I would accidentally insert hidden characters when pasting
hidutil property --set '{"UserKeyMapping":
    [{"HIDKeyboardModifierMappingSrc":0x700000065,
      "HIDKeyboardModifierMappingDst":0x7000000e6}]
}'

davbeck

struct Lock {
	private var unfairLock = os_unfair_lock_s()
	
	mutating func lock(_ work: () -> Void) {
		self.lock()
		work()
		self.unlock()
	}
	
	mutating func trylock(_ work: () -> Void) -> Bool {

davbeck

import ObjectiveC


extension objc_AssociationPolicy {
	public static let retain = objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN
	public static let retainNonatomic = objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC
	public static let copy = objc_AssociationPolicy.OBJC_ASSOCIATION_COPY
	public static let copyNonatomic = objc_AssociationPolicy.OBJC_ASSOCIATION_COPY_NONATOMIC
	public static let assign = objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN
}

davbeck

import Foundation

/// Allows a property to fail decoding, defaulting to nil instead of surfacing the error.
@propertyWrapper
struct AllowDecodeFailure<Wrapped>: Codable where Wrapped: Codable {
	var wrappedValue: Wrapped?
	
	init() {
		self.wrappedValue = nil
	}

davbeck

func _if<T>(_ test: Bool, action: () -> T) -> T? {
	if test {
		return action()
	} else {
		return nil
	}
}

extension Optional {
	func _else(action: () -> Wrapped) -> Wrapped {