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THINKING OUTSIDE THE BOX WITH ! SWIFT PACKAGE MANAGER HACKING WITH SWIFT LIVE | BATH, UK | JULY 2019 BY ELLEN SHAPIRO | @DESIGNATEDNERD | APOLLOGRAPHQL.COM

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DRAGGING THINGS INTO PROJECTS

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UPDATES? (˽°□°҂˽Ɨ ˍʓˍ

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GIT SUBMODULES

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CHANGES?

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COCOAPODS

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! CARTHAGE

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CODE SIGNING ! SILLINESS

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SWIFT PACKAGE MANAGER

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SERVER:

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SERVER: COMMAND LINE:

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SERVER: COMMAND LINE: IOS:

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! XCODE 11

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! BETA?!

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RIGHT NOW!

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Command line. Sorry.

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swift package init

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swift package init --type executable

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swift package init --type library

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swift package generate-xcodeproj

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swift build

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swift run

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swift run [project] [arguments]

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I HATE BASH

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I HATE BASH (I DON'T UNDERSTAND BASH)

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I HATE BASH (I AM VERY BAD AT BASH)

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TYPE SAFETY?

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! BETTER BUILD SCRIPT WRAPPERS

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RUN WHEN YOU BUILD YOUR MAIN PROJECT

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IN YOUR SPM EXECUTABLE PROJECT

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main.swift let args = CommandLine.arguments.dropFirst() print("Arguments: \(args)") if args.contains("--prebuild") { print("Run pre-build tasks") } if args.contains("--postbuild") { print("Run post-build tasks") }

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main.swift let args = CommandLine.arguments.dropFirst() print("Arguments: \(args)") if args.contains("--prebuild") { print("Run pre-build tasks") } if args.contains("--postbuild") { print("Run post-build tasks") }

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main.swift let args = CommandLine.arguments.dropFirst() print("Arguments: \(args)") if args.contains("--prebuild") { print("Run pre-build tasks") } if args.contains("--postbuild") { print("Run post-build tasks") }

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main.swift let args = CommandLine.arguments.dropFirst() print("Arguments: \(args)") if args.contains("--prebuild") { print("Run pre-build tasks") } if args.contains("--postbuild") { print("Run post-build tasks") }

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IN YOUR ACTUAL PROJECT

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IN YOUR ACTUAL PROJECT (EX: HTTPS://GITHUB.COM/DESIGNATEDNERD/PANORAMARAMA)

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<--- Main app <--- SPM executable

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PRE-BUILD SCRIPT cd Scripty swift run Scripty --prebuild

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PRE-BUILD SCRIPT cd Scripty swift run Scripty --prebuild POST-BUILD SCRIPT cd Scripty swift run Scripty --postbuild

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WHAT CAN I DO WITH THIS?

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HIDE AN OPEN-SOURCE PROJECT'S ! BUILD SECRETS

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Environment.plist

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HTTPS://GITHUB.COM/DESIGNATEDNERD/ PLISTER

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EnvironmentUpdater.swift import Files import Plister struct EnvironmentUpdater { static func updateEnvironment(file: File) throws { try Plister.setValue("I was updated!", for: "string_secret", in: file) } static func resetEnvironment(file: File) throws { try file.resetToGitHEAD() } }

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EnvironmentUpdater.swift import Files import Plister struct EnvironmentUpdater { static func updateEnvironment(file: File) throws { try Plister.setValue("I was updated!", for: "string_secret", in: file) } static func resetEnvironment(file: File) throws { try file.resetToGitHEAD() } }

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EnvironmentUpdater.swift import Files import Plister struct EnvironmentUpdater { static func updateEnvironment(file: File) throws { try Plister.setValue("I was updated!", for: "string_secret", in: file) } static func resetEnvironment(file: File) throws { try file.resetToGitHEAD() } }

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EnvironmentUpdater.swift import Files import Plister struct EnvironmentUpdater { static func updateEnvironment(file: File) throws { try Plister.setValue("I was updated!", for: "string_secret", in: file) } static func resetEnvironment(file: File) throws { try file.resetToGitHEAD() } }

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EnvironmentUpdater.swift import Files import Plister struct EnvironmentUpdater { static func updateEnvironment(file: File) throws { try Plister.setValue("I was updated!", for: "string_secret", in: file) } static func resetEnvironment(file: File) throws { try file.resetToGitHEAD() } }

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main.swift let args = CommandLine.arguments.dropFirst() let plistFile = try SourceFolders.appRoot.file(named: "Environment.plist") if args.contains("--prebuild") { print("Run pre-build tasks") try EnvironmentUpdater.updateEnvironment(file: plistFile) } if args.contains("--postbuild") { print("Run post-build tasks") try EnvironmentUpdater.resetEnvironment(file: plistFile) }

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main.swift let args = CommandLine.arguments.dropFirst() let plistFile = try SourceFolders.appRoot.file(named: "Environment.plist") if args.contains("--prebuild") { print("Run pre-build tasks") try EnvironmentUpdater.updateEnvironment(file: plistFile) } if args.contains("--postbuild") { print("Run post-build tasks") try EnvironmentUpdater.resetEnvironment(file: plistFile) }

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main.swift let args = CommandLine.arguments.dropFirst() let plistFile = try SourceFolders.appRoot.file(named: "Environment.plist") if args.contains("--prebuild") { print("Run pre-build tasks") try EnvironmentUpdater.updateEnvironment(file: plistFile) } if args.contains("--postbuild") { print("Run post-build tasks") try EnvironmentUpdater.resetEnvironment(file: plistFile) }

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main.swift let args = CommandLine.arguments.dropFirst() let plistFile = try SourceFolders.appRoot.file(named: "Environment.plist") if args.contains("--prebuild") { print("Run pre-build tasks") try EnvironmentUpdater.updateEnvironment(file: plistFile) } if args.contains("--postbuild") { print("Run post-build tasks") try EnvironmentUpdater.resetEnvironment(file: plistFile) }

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EnvironmentUpdater.swift import Files import Plister struct EnvironmentUpdater { static func updateEnvironment(file: File) throws { try Plister.setValue("I was updated!", for: "string_secret", in: file) } static func resetEnvironment(file: File) throws { try file.resetToGitHEAD() } }

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EnvironmentUpdater.swift static func updateEnvironment(file: File) throws { if let secretsFolder = SourceFolders.secrets, let secrets = try? secretsFolder.file(named: "production.json") { let json = try JSONLoader.loadJSONDictionary(from: secrets) try json.forEach { key, value in try Plister.setValue(value, for: key, in: file) } } else { let env = ProcessInfo.processInfo.environment guard let stringSecret = env["string_secret"] else { throw EnvironmentUpdater.EnvError.couldntLoadFromEnv } try Plister.setValue(stringSecret, for: "string_secret", in: file) } }

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EnvironmentUpdater.swift static func updateEnvironment(file: File) throws { if let secretsFolder = SourceFolders.secrets, let secrets = try? secretsFolder.file(named: "production.json") { let json = try JSONLoader.loadJSONDictionary(from: secrets) try json.forEach { key, value in try Plister.setValue(value, for: key, in: file) } } else { let env = ProcessInfo.processInfo.environment guard let stringSecret = env["string_secret"] else { throw EnvironmentUpdater.EnvError.couldntLoadFromEnv } try Plister.setValue(stringSecret, for: "string_secret", in: file) } }

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EnvironmentUpdater.swift static func updateEnvironment(file: File) throws { if let secretsFolder = SourceFolders.secrets, let secrets = try? secretsFolder.file(named: "production.json") { let json = try JSONLoader.loadJSONDictionary(from: secrets) try json.forEach { key, value in try Plister.setValue(value, for: key, in: file) } } else { let env = ProcessInfo.processInfo.environment guard let stringSecret = env["string_secret"] else { throw EnvironmentUpdater.EnvError.couldntLoadFromEnv } try Plister.setValue(stringSecret, for: "string_secret", in: file) } }

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CONTINUOUS INTEGRATION SERVERS

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EnvironmentUpdater.swift static func updateEnvironment(file: File) throws { if let secretsFolder = SourceFolders.secrets, let secrets = try? secretsFolder.file(named: "production.json") { let json = try JSONLoader.loadJSONDictionary(from: secrets) try json.forEach { key, value in try Plister.setValue(value, for: key, in: file) } } else { let env = ProcessInfo.processInfo.environment guard let stringSecret = env["string_secret"] else { throw EnvironmentUpdater.EnvError.couldntLoadFromEnv } try Plister.setValue(stringSecret, for: "string_secret", in: file) } }

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EnvironmentUpdater.swift static func updateEnvironment(file: File) throws { if let secretsFolder = SourceFolders.secrets, let secrets = try? secretsFolder.file(named: "production.json") { let json = try JSONLoader.loadJSONDictionary(from: secrets) try json.forEach { key, value in try Plister.setValue(value, for: key, in: file) } } else { let env = ProcessInfo.processInfo.environment guard let stringSecret = env["string_secret"] else { throw EnvironmentUpdater.EnvError.couldntLoadFromEnv } try Plister.setValue(stringSecret, for: "string_secret", in: file) } }

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DIDN'T TOUCH THE COMMAND LINE!

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WHAT ELSE CAN I DO?

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"Stringly-typed cdoe is a tribleee idae."

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"Stringly-typed code is a terrible idea."

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WHAT CAN WE DETERMINE AT BUILD TIME TO AVOID USING HARD-CODED STRINGS?

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GENERATE CODE FOR ! ASSET CATALOGS

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BEFORE UIImage(named: "fragile")! UIColor(named: "uhoh")!

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GENERATE METHODS TO ACCESS ! LOCALIZED STRINGS

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YourCode.swift NSLocalizedString("The key that will be displayed by default", "Some comment")

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YourCode.swift NSLocalizedString("The key that will be displayed by default", "Some comment") Base.lproj/Localizable.strings /* Some Comment */ "The key that will be displayed by default" = "The key that will be displayed by default";

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YourCode.swift NSLocalizedString("The key that will be displayed by default", "Some comment") Base.lproj/Localizable.strings /* Some Comment */ "The key that will be displayed by default" = "The key that will be displayed by default"; nl.lproj/Localizable.strings /* Some Comment */ "The key that will be displayed by default" = "De sleutel die standaard wordt weergegeven";

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YourCode.swift NSLocalizedString("default_key", "Some comment") Base.lproj/Localizable.strings /* Some Comment */ "default_key" = "The key that will be displayed by default"; nl.lproj/Localizable.strings /* Some Comment */ "default_key" = "De sleutel die standaard wordt weergegeven";

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✨ GENERATE ENUMS!

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YourCode.swift LocalizedString(key: .default_key) Base.lproj/Localizable.strings /* Some Comment */ "default_key" = "The key that will be displayed by default"; nl.lproj/Localizable.strings /* Some Comment */ "default_key" = "De sleutel die standaard wordt weergegeven";

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✨ GENERATE ENUMS!

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AFTER UIImage(from: .fragile) UIColor(from: .uhoh)

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THINGS I HAVE LEARNED THE HARD WAY (SO YOU DON'T HAVE TO)

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KEEP AS MUCH IN SWIFT AS POSSIBLE

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CREATE REUSABLE LIBRARIES

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CREATE PER-APP EXECUTABLES TO TAKE TAKE ADVANTAGE OF THOSE LIBRARIES

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TEST!

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LEVERAGE GIT

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! MARATHON

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swift-sh

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OBLIGATORY SUMMARY SLIDE

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OBLIGATORY SUMMARY SLIDE > Swift Package Manager can help you make your iOS Projects better today

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OBLIGATORY SUMMARY SLIDE > Swift Package Manager can help you make your iOS Projects better today > Move build scripts to swift and keep type safety

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OBLIGATORY SUMMARY SLIDE > Swift Package Manager can help you make your iOS Projects better today > Move build scripts to swift and keep type safety > Actually test your build scripts!

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OBLIGATORY SUMMARY SLIDE > Swift Package Manager can help you make your iOS Projects better today > Move build scripts to swift and keep type safety > Actually test your build scripts! > In Xcode 11, you should be able to use it for your main app and scripts in the same project.

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!

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LINKS! > It's time to use Swift Package Manager https://artsy.github.io/blog/2019/01/05/its-time-to- use-spm/ > Marathon https://github.com/JohnSundell/Marathon > swift-sh https://github.com/mxcl/swift-sh