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pointfreeco · Jun 16, 2020 · 649f0a4 · 649f0a4
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diff --git a/0105-combine-schedulers-pt2/README.md b/0105-combine-schedulers-pt2/README.md
@@ -1,5 +1,5 @@
 ## [Point-Free](https://www.pointfree.co)
 
-> #### This directory contains code from Point-Free Episode: [Combine Schedulers: Controlling Time](https://www.pointfree.co/episodes/ep105-combine-schedulers-controlling-time)
+> #### This directory contains code from Point-Free Episode: [Combine Schedulers: Erasing Time](https://www.pointfree.co/episodes/ep106-combine-schedulers-erasing-time)
 >
-> The `Scheduler` protocol of Combine is a powerful abstraction that unifies many ways of executing asynchronous work, and it can even control the flow of time through our code. Unfortunately Combine doesn't give us this ability out of the box, so let's build it from scratch.
+> We refactor our application’s code so that we can run it in production with a live dispatch queue for the scheduler, while allowing us to run it in tests with a test scheduler. If we do this naively we will find that generics infect many parts of our code, but luckily we can employ the technique of type erasure to make things much nicer.
diff --git a/0106-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers.xcodeproj/project.pbxproj b/0106-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers.xcodeproj/project.pbxproj
diff --git a/...ombineSchedulers/CombineSchedulers.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/...ombineSchedulers/CombineSchedulers.xcodeproj/project.xcworkspace/contents.xcworkspacedata
diff --git a/...ers/CombineSchedulers.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/...ers/CombineSchedulers.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?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>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/...eSchedulers/CombineSchedulers.xcodeproj/xcshareddata/xcschemes/CombineSchedulers.xcscheme b/...eSchedulers/CombineSchedulers.xcodeproj/xcshareddata/xcschemes/CombineSchedulers.xcscheme
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1150"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "2A3CEE822486B4EA00C69C3C"
+               BuildableName = "CombineSchedulers.app"
+               BlueprintName = "CombineSchedulers"
+               ReferencedContainer = "container:CombineSchedulers.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "2A3CEE982486B4EC00C69C3C"
+               BuildableName = "CombineSchedulersTests.xctest"
+               BlueprintName = "CombineSchedulersTests"
+               ReferencedContainer = "container:CombineSchedulers.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "2A3CEE822486B4EA00C69C3C"
+            BuildableName = "CombineSchedulers.app"
+            BlueprintName = "CombineSchedulers"
+            ReferencedContainer = "container:CombineSchedulers.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "2A3CEE822486B4EA00C69C3C"
+            BuildableName = "CombineSchedulers.app"
+            BlueprintName = "CombineSchedulers"
+            ReferencedContainer = "container:CombineSchedulers.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/0106-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers/AnyScheduler.swift b/0106-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers/AnyScheduler.swift
@@ -0,0 +1,47 @@
+import Combine
+
+struct AnyScheduler<SchedulerTimeType, SchedulerOptions>: Scheduler
+  where SchedulerTimeType: Strideable, SchedulerTimeType.Stride: SchedulerTimeIntervalConvertible
+{
+  func schedule(after date: SchedulerTimeType, interval: SchedulerTimeType.Stride, tolerance: SchedulerTimeType.Stride, options: SchedulerOptions?, _ action: @escaping () -> Void) -> Cancellable {
+    self._schedulerWithInterval(date, interval, tolerance, options, action)
+  }
+
+  private let _schedulerWithInterval: (SchedulerTimeType, SchedulerTimeType.Stride, SchedulerTimeType.Stride, SchedulerOptions?, @escaping () -> Void) -> Cancellable
+
+  func schedule(after date: SchedulerTimeType, tolerance: SchedulerTimeType.Stride, options: SchedulerOptions?, _ action: @escaping () -> Void) {
+    self._scheduleAfterDelay(date, tolerance, options, action)
+  }
+
+  private let _scheduleAfterDelay: (SchedulerTimeType, SchedulerTimeType.Stride, SchedulerOptions?, @escaping () -> Void) -> Void
+
+  func schedule(options: SchedulerOptions?, _ action: @escaping () -> Void) {
+    self._schedule(options, action)
+  }
+
+  private let _schedule: (SchedulerOptions?, @escaping () -> Void) -> Void
+
+  var now: SchedulerTimeType {
+    self._now()
+  }
+  var minimumTolerance: SchedulerTimeType.Stride {
+    self._minimumTolerance()
+  }
+
+  private let _now: () -> SchedulerTimeType
+  private let _minimumTolerance: () -> SchedulerTimeType.Stride
+
+
+  init<S: Scheduler>(
+    _ scheduler: S
+  ) where S.SchedulerTimeType == SchedulerTimeType, S.SchedulerOptions == SchedulerOptions {
+
+    self._now = { scheduler.now }
+    self._minimumTolerance = { scheduler.minimumTolerance }
+    self._schedule = { scheduler.schedule(options: $0, $1) }
+    self._scheduleAfterDelay = { scheduler.schedule(after: $0, tolerance: $1, options: $2, $3) }
+    self._schedulerWithInterval = { scheduler.schedule(after: $0, interval: $1, tolerance: $2, options: $3, $4) }
+  }
+}
+
+typealias AnySchedulerOf<S: Scheduler> = AnyScheduler<S.SchedulerTimeType, S.SchedulerOptions>
diff --git a/0106-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers/AppDelegate.swift b/0106-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers/AppDelegate.swift
@@ -0,0 +1,37 @@
+//
+//  AppDelegate.swift
+//  CombineSchedulers
+//
+//  Created by Point-Free on 6/2/20.
+//  Copyright © 2020 Point-Free. All rights reserved.
+//
+
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+
+  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+    // Override point for customization after application launch.
+    return true
+  }
+
+  // MARK: UISceneSession Lifecycle
+
+  func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+    // Called when a new scene session is being created.
+    // Use this method to select a configuration to create the new scene with.
+    return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+  }
+
+  func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+    // Called when the user discards a scene session.
+    // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+    // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+  }
+
+
+}
+
diff --git a/...-pt3/CombineSchedulers/CombineSchedulers/Assets.xcassets/AppIcon.appiconset/Contents.json b/...-pt3/CombineSchedulers/CombineSchedulers/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/...-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers/Assets.xcassets/Contents.json b/...-combine-schedulers-pt3/CombineSchedulers/CombineSchedulers/Assets.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/...ine-schedulers-pt3/CombineSchedulers/CombineSchedulers/Base.lproj/LaunchScreen.storyboard b/...ine-schedulers-pt3/CombineSchedulers/CombineSchedulers/Base.lproj/LaunchScreen.storyboard
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>