🎱

Author: stephencelis

.circleci/config.yml

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+version: 2
+
+jobs:
+  build:
+    macos:
+      xcode: "10.1.0"
+
+    steps:
+      - checkout
+
+      - run:
+          name: Mac Info
+          command: system_profiler SPSoftwareDataType
+
+      - run:
+          name: Simulator Info
+          command: instruments -s devices
+
+      - run:
+          name: Run iOS tests
+          command: make test-ios
+
+      - run:
+          name: Run macOS tests
+          command: make test-macos
+
+      - run:
+          name: Run Swift tests
+          command: make test-swift

.gitignore

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+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+.build/
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+
+.DS_Store

.swift-version

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+4.2.1

.travis.yml

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+os:
+  - linux
+env:
+language: generic
+sudo: required
+dist: trusty
+install:
+  - if [ $TRAVIS_OS_NAME = linux ]; then
+      eval "$(curl -sL https://swiftenv.fuller.li/install.sh)";
+    fi
+script:
+  - swift test

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at [email protected]. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/

Dockerfile

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+FROM swift:4.2
+
+WORKDIR /package
+
+COPY . ./
+
+RUN swift package resolve
+RUN swift package clean
+CMD swift test --parallel

Gen.playground/Pages/Art.xcplaygroundpage/Contents.swift

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+import Gen
+import UIKit
+
+// We want to create a random art generator that creates UIImages.
+// ⚠️ Run this playground with the live view open. ⚠️
+
+let canvas = CGRect(x: 0, y: 0, width: 600, height: 600)
+let mainArea = canvas.insetBy(dx: 130, dy: 100)
+let numLines = 60
+let numPointsPerLine = 60
+let dx = mainArea.width / CGFloat(numPointsPerLine)
+let dy = mainArea.height / CGFloat(numLines)
+
+func bump(
+  amplitude: CGFloat,
+  center: CGFloat,
+  plateauSize: CGFloat,
+  curveSize: CGFloat
+  ) -> (CGFloat) -> CGFloat {
+
+  // A nice smooth curve that starts at zero and trends towards 1 asymptotically
+  func f(_ x: CGFloat) -> CGFloat {
+    if x <= 0 { return 0 }
+    return exp(-1 / x)
+  }
+
+  // A nice smooth curve that starts at zero and curves up to 1 on the unit interval.
+  func g(_ x: CGFloat) -> CGFloat {
+    return f(x) / (f(x) + f(1 - x))
+  }
+
+  return { x in
+    let plateauSize = plateauSize / 2
+    let curveSize = curveSize / 2
+    let size = plateauSize + curveSize
+    let x = x - center
+    return amplitude * (1 - g((x * x - plateauSize * plateauSize) / (size * size - plateauSize * plateauSize)))
+  }
+}
+
+func noisyBump(
+  amplitude: CGFloat,
+  center: CGFloat,
+  plateauSize: CGFloat,
+  curveSize: CGFloat
+  ) -> (CGFloat) -> Gen<CGFloat> {
+
+  let curve = bump(amplitude: amplitude, center: center, plateauSize: plateauSize, curveSize: curveSize)
+
+  return { x in
+    let y = curve(x)
+    return Gen<CGFloat>.float(in: 0...3).map { $0 * (y / amplitude + 0.5) + y }
+  }
+}
+
+let curve = zip(
+  Gen<CGFloat>.float(in: -30...(-1)),
+  Gen<CGFloat>.float(in: -60...60)
+    .map { $0 + canvas.width / 2 },
+  Gen<CGFloat>.float(in: 0...60),
+  Gen<CGFloat>.float(in: 10...60)
+  )
+  .map(noisyBump(amplitude:center:plateauSize:curveSize:))
+
+func path(from min: CGFloat, to max: CGFloat, baseline: CGFloat) -> Gen<CGPath> {
+  return Gen<CGPath> { rng in
+    let bumps = curve.array(of: .int(in: 1...4))
+      .run(using: &rng)
+
+    let path = CGMutablePath()
+    path.move(to: CGPoint(x: min, y: baseline))
+    stride(from: min, to: max, by: dx).forEach { x in
+      let ys = bumps.map { $0(x).run(using: &rng) }
+      let average = ys.reduce(0, +) / CGFloat(ys.count)
+      path.addLine(to: CGPoint(x: x, y: baseline + average))
+    }
+    path.addLine(to: CGPoint.init(x: max, y: baseline))
+    return path
+  }
+}
+
+let paths = stride(from: mainArea.minY, to: mainArea.maxY, by: dy)
+  .map { path(from: mainArea.minX, to: mainArea.maxX, baseline: $0) }
+  .sequence()
+
+let colors = [
+  UIColor(red: 0.47, green: 0.95, blue: 0.69, alpha: 1),
+  UIColor(red: 1, green: 0.94, blue: 0.5, alpha: 1),
+  UIColor(red: 0.3, green: 0.80, blue: 1, alpha: 1),
+  UIColor(red: 0.59, green: 0.30, blue: 1, alpha: 1)
+]
+
+let image = paths.map { paths in
+  UIGraphicsImageRenderer(bounds: canvas).image { ctx in
+    let ctx = ctx.cgContext
+
+    ctx.setFillColor(UIColor.black.cgColor)
+    ctx.fill(canvas)
+
+    paths.enumerated().forEach { idx, path in
+      ctx.setStrokeColor(
+        colors[colors.count * idx / paths.count].cgColor
+      )
+      ctx.addPath(path)
+      ctx.drawPath(using: .fillStroke)
+    }
+  }
+}
+
+let imageView = image.map(UIImageView.init)
+
+import PlaygroundSupport
+PlaygroundPage.current.liveView = imageView.run()

Gen.playground/Pages/Passwords.xcplaygroundpage/Contents.swift

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+import Gen
+
+// We want to generate passwords in the same format as those suggested by the iCloud keychain, for example `huwKun-1zyjxi-nyxseh`. It takes very little work! We're just three operations away:
+
+let password = Gen.letterOrNumber
+  // Generate a 6-character string of random letters and numbers.
+  .string(of: .always(6))
+  // Generate 3 segments of these strings.
+  .array(of: .always(3))
+  // And join them.
+  .map { $0.joined(separator: "-") }
+
+password.run()
+password.run()
+password.run()
+password.run()
+password.run()
+
+// The passwords Apple generates appears to strongly preference lowercase letters over uppercase letters. To get a bit closer we can dip down for a few lower-level combinators:
+let iCloudPassword = Gen
+  // Rather than work with evenly-distributed randomness across lowercase letters, uppercase letters, and numbers, let's weight lowercase letters much higher.
+  .frequency(
+    (12, .lowercaseLetter),
+    (1, .uppercaseLetter),
+    (1, .number)
+  )
+  // And do the same work as before.
+  .string(of: .always(6))
+  .array(of: .always(3))
+  .map { $0.joined(separator: "-") }
+
+iCloudPassword.run()
+iCloudPassword.run()
+iCloudPassword.run()
+iCloudPassword.run()
+iCloudPassword.run()

Gen.playground/Pages/Sandbox.xcplaygroundpage/Contents.swift

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+import Gen
+
+zip(.bool, .bool).dictionary(ofAtMost: .always(1)).run()
+Gen.bool.set(ofAtMost: .always(3)).run()
+Gen.float(in: 0...1)
+
+import CoreGraphics
+Gen.float80(in: 0...1)

Gen.playground/Pages/Zalgo.xcplaygroundpage/Contents.swift

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+import Gen
+
+// We want to create a generator that can randomly "Zalgo-ify" any string, which mean sit will glitch it
+// out with random artifacts, as seen here: http://www.eeemo.net
+
+// A Zalgo character is a UTF8 character in the "combining character" range.
+// See: https://en.wikipedia.org/wiki/Combining_character
+let zalgo = Gen.int(in: 0x300 ... 0x36f)
+  .map { String(UnicodeScalar($0)!) }
+
+// Here's what some Zalgo characters look like
+zalgo.run()
+zalgo.run()
+zalgo.run()
+zalgo.run()
+
+// Given an intensity, combines a random number of Zalgo characters into a single string.
+func zalgos(intensity: Gen<Int>) -> Gen<String> {
+  return zalgo
+    .array(of: intensity)
+    .map { $0.joined() }
+}
+
+let tameZalgos   = zalgos(intensity: .int(in: 0...1))
+let lowZalgos    = zalgos(intensity: .int(in: 1...5))
+let mediumZalgos = zalgos(intensity: .int(in: 0...10))
+let highZalgos   = zalgos(intensity: .int(in: 0...20))
+
+"a" + tameZalgos.run()
+
+"a" + lowZalgos.run()
+
+"a" + mediumZalgos.run()
+
+"a" + highZalgos.run()
+
+// Given a way to generate a bunch of Zalgo characters, this will return a function that can "Zalgo-ify" any string given to it.
+func zalgoify(with zalgos: Gen<String>) -> (String) -> Gen<String> {
+  return { string in
+    return Gen { rng in
+      string
+        .map { char in String(char) + zalgos.run(using: &rng) }
+        .joined()
+    }
+  }
+}
+
+let tameZalgoify   = zalgoify(with: tameZalgos)
+let lowZalgoify    = zalgoify(with: lowZalgos)
+let mediumZalgoify = zalgoify(with: mediumZalgos)
+let highZalgoify   = zalgoify(with: highZalgos)
+
+tameZalgoify("What’s the point?").run()
+
+lowZalgoify("What’s the point?").run()
+
+mediumZalgoify("What’s the point?").run()
+
+highZalgoify("What’s the point?").run()