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0075-modular-state-management-wtp/PrimeTime/ComposableArchitecture/ComposableArchitecture.h

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+//
+//  ComposableArchitecture.h
+//  ComposableArchitecture
+//
+//  Created by Stephen Celis on 9/8/19.
+//  Copyright © 2019 Point-Free. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+//! Project version number for ComposableArchitecture.
+FOUNDATION_EXPORT double ComposableArchitectureVersionNumber;
+
+//! Project version string for ComposableArchitecture.
+FOUNDATION_EXPORT const unsigned char ComposableArchitectureVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <ComposableArchitecture/PublicHeader.h>
+
+

0075-modular-state-management-wtp/PrimeTime/ComposableArchitecture/ComposableArchitecture.swift

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+import Combine
+import SwiftUI
+
+public final class Store<Value, Action>: ObservableObject {
+  private let reducer: (inout Value, Action) -> Void
+  @Published public private(set) var value: Value
+  private var cancellable: Cancellable?
+
+  public init(initialValue: Value, reducer: @escaping (inout Value, Action) -> Void) {
+//    self.objectWillChange
+//    self.$value.sink(receiveValue: <#T##((Value) -> Void)##((Value) -> Void)##(Value) -> Void#>)
+    self.reducer = reducer
+    self.value = initialValue
+  }
+
+  public func send(_ action: Action) {
+    self.reducer(&self.value, action)
+  }
+
+  // ((Value) -> LocalValue) -> (Store<Value ,_>) -> Store<LocalValue, _>
+  // ((A) -> B) -> (Store<A ,_>) -> Store<B, _>
+  // map: ((A) -> B) -> (F<A>) -> F<B>
+
+  public func view<LocalValue, LocalAction>(
+    value toLocalValue: @escaping (Value) -> LocalValue,
+    action toGlobalAction: @escaping (LocalAction) -> Action
+  ) -> Store<LocalValue, LocalAction> {
+    let localStore = Store<LocalValue, LocalAction>(
+      initialValue: toLocalValue(self.value),
+      reducer: { localValue, localAction in
+        self.send(toGlobalAction(localAction))
+        localValue = toLocalValue(self.value)
+    }
+    )
+    localStore.cancellable = self.$value.sink { [weak localStore] newValue in
+      localStore?.value = toLocalValue(newValue)
+    }
+    return localStore
+  }
+
+  // ((LocalAction) -> Action) -> (Store<_, Action>) -> Store<_, LocalAction>
+  // ((B) -> A) -> (Store<_, A>) -> Store<_, B>
+  // pullback: ((B) -> A) -> (F<A>) -> F<B>
+}
+
+
+func transform<A, B, Action>(
+  _ reducer: (A, Action) -> A,
+  _ f: (A) -> B
+) -> (B, Action) -> B {
+  fatalError()
+}
+
+
+public func combine<Value, Action>(
+  _ reducers: (inout Value, Action) -> Void...
+) -> (inout Value, Action) -> Void {
+  return { value, action in
+    for reducer in reducers {
+      reducer(&value, action)
+    }
+  }
+}
+
+public func pullback<LocalValue, GlobalValue, LocalAction, GlobalAction>(
+  _ reducer: @escaping (inout LocalValue, LocalAction) -> Void,
+  value: WritableKeyPath<GlobalValue, LocalValue>,
+  action: WritableKeyPath<GlobalAction, LocalAction?>
+) -> (inout GlobalValue, GlobalAction) -> Void {
+  return { globalValue, globalAction in
+    guard let localAction = globalAction[keyPath: action] else { return }
+    reducer(&globalValue[keyPath: value], localAction)
+  }
+}
+
+public func logging<Value, Action>(
+  _ reducer: @escaping (inout Value, Action) -> Void
+) -> (inout Value, Action) -> Void {
+  return { value, action in
+    reducer(&value, action)
+    print("Action: \(action)")
+    print("Value:")
+    dump(value)
+    print("---")
+  }
+}
+

0075-modular-state-management-wtp/PrimeTime/ComposableArchitecture/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+</dict>
+</plist>

0075-modular-state-management-wtp/PrimeTime/ComposableArchitectureTests/ComposableArchitectureTests.swift

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+//
+//  ComposableArchitectureTests.swift
+//  ComposableArchitectureTests
+//
+//  Created by Stephen Celis on 9/8/19.
+//  Copyright © 2019 Point-Free. All rights reserved.
+//
+
+import XCTest
+@testable import ComposableArchitecture
+
+class ComposableArchitectureTests: XCTestCase {
+
+    override func setUp() {
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+
+    override func tearDown() {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+    }
+
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct results.
+    }
+
+    func testPerformanceExample() {
+        // This is an example of a performance test case.
+        self.measure {
+            // Put the code you want to measure the time of here.
+        }
+    }
+
+}

0075-modular-state-management-wtp/PrimeTime/ComposableArchitectureTests/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>

0075-modular-state-management-wtp/PrimeTime/Counter/Counter.h

@@ -0,0 +1,19 @@
+//
+//  Counter.h
+//  Counter
+//
+//  Created by Stephen Celis on 9/8/19.
+//  Copyright © 2019 Point-Free. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+//! Project version number for Counter.
+FOUNDATION_EXPORT double CounterVersionNumber;
+
+//! Project version string for Counter.
+FOUNDATION_EXPORT const unsigned char CounterVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <Counter/PublicHeader.h>
+
+

0075-modular-state-management-wtp/PrimeTime/Counter/Counter.swift

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+import ComposableArchitecture
+import PrimeModal
+import SwiftUI
+
+public enum CounterAction {
+  case decrTapped
+  case incrTapped
+}
+
+public func counterReducer(state: inout Int, action: CounterAction) {
+  switch action {
+  case .decrTapped:
+    state -= 1
+
+  case .incrTapped:
+    state += 1
+  }
+}
+
+public let counterViewReducer = combine(
+  pullback(counterReducer, value: \CounterViewState.count, action: \CounterViewAction.counter),
+  pullback(primeModalReducer, value: \.self, action: \.primeModal)
+)
+
+struct PrimeAlert: Identifiable {
+  let prime: Int
+  var id: Int { self.prime }
+}
+
+public typealias CounterViewState = (count: Int, favoritePrimes: [Int])
+
+public enum CounterViewAction {
+  case counter(CounterAction)
+  case primeModal(PrimeModalAction)
+
+  var counter: CounterAction? {
+    get {
+      guard case let .counter(value) = self else { return nil }
+      return value
+    }
+    set {
+      guard case .counter = self, let newValue = newValue else { return }
+      self = .counter(newValue)
+    }
+  }
+
+  var primeModal: PrimeModalAction? {
+    get {
+      guard case let .primeModal(value) = self else { return nil }
+      return value
+    }
+    set {
+      guard case .primeModal = self, let newValue = newValue else { return }
+      self = .primeModal(newValue)
+    }
+  }
+
+}
+
+public struct CounterView: View {
+  @ObservedObject var store: Store<CounterViewState, CounterViewAction>
+  @State var isPrimeModalShown = false
+  @State var alertNthPrime: PrimeAlert?
+  @State var isNthPrimeButtonDisabled = false
+
+  public init(store: Store<CounterViewState, CounterViewAction>) {
+    self.store = store
+  }
+
+  public var body: some View {
+    VStack {
+      HStack {
+        Button("-") { self.store.send(.counter(.decrTapped)) }
+        Text("\(self.store.value.count)")
+        Button("+") { self.store.send(.counter(.incrTapped)) }
+      }
+      Button("Is this prime?") { self.isPrimeModalShown = true }
+      Button(
+        "What is the \(ordinal(self.store.value.count)) prime?",
+        action: self.nthPrimeButtonAction
+      )
+      .disabled(self.isNthPrimeButtonDisabled)
+    }
+    .font(.title)
+    .navigationBarTitle("Counter demo")
+    .sheet(isPresented: self.$isPrimeModalShown) {
+      IsPrimeModalView(
+        store: self.store
+          .view(
+            value: { ($0.count, $0.favoritePrimes) },
+            action: { .primeModal($0) }
+        )
+      )
+    }
+    .alert(item: self.$alertNthPrime) { alert in
+      Alert(
+        title: Text("The \(ordinal(self.store.value.count)) prime is \(alert.prime)"),
+        dismissButton: .default(Text("Ok"))
+      )
+    }
+  }
+
+  func nthPrimeButtonAction() {
+    self.isNthPrimeButtonDisabled = true
+    nthPrime(self.store.value.count) { prime in
+      self.alertNthPrime = prime.map(PrimeAlert.init(prime:))
+      self.isNthPrimeButtonDisabled = false
+    }
+  }
+}
+
+func nthPrime(_ n: Int, callback: @escaping (Int?) -> Void) -> Void {
+  wolframAlpha(query: "prime \(n)") { result in
+    callback(
+      result
+        .flatMap {
+          $0.queryresult
+            .pods
+            .first(where: { $0.primary == .some(true) })?
+            .subpods
+            .first?
+            .plaintext
+      }
+      .flatMap(Int.init)
+    )
+  }
+}
+
+func ordinal(_ n: Int) -> String {
+  let formatter = NumberFormatter()
+  formatter.numberStyle = .ordinal
+  return formatter.string(for: n) ?? ""
+}

0075-modular-state-management-wtp/PrimeTime/Counter/Info.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+</dict>
+</plist>