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SWIFT Scripting AYAKA NONAKA @AYANONAGON

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Designers ENGINEERS

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! ▸ Designer designs and exports assets

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! ▸ Designer designs and exports assets ▸ Upload to Dropbox or send over Slack

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! ▸ Designer designs and exports assets ▸ Upload to Dropbox or send over Slack ▸ Engineer adds to venmo-ios codebase

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!

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! ▸ So many Dropbox links & Slack messages, gets confusing

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! ▸ So many Dropbox links & Slack messages, gets confusing ▸ Sometimes assets sizes are wrong

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! ▸ So many Dropbox links & Slack messages, gets confusing ▸ Sometimes assets sizes are wrong ▸ No easy way to see all the assets in our app

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!

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POD 'VENMO-IOS-IMAGES'

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! ▸ Designer designs and exports assets

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! ▸ Designer designs and exports assets ▸ Designer makes pull-request to venmo-ios-images repo

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! ▸ Designer designs and exports assets ▸ Designer makes pull-request to venmo-ios-images repo ▸ Engineer reviews changes and merges

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! ▸ Designer designs and exports assets ▸ Designer makes pull-request to venmo-ios-images repo ▸ Engineer reviews changes and merges ▸ Engineer generates UIImage category for the new image(s)

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! ▸ Designer designs and exports assets ▸ Designer makes pull-request to venmo-ios-images repo ▸ Engineer reviews changes and merges ▸ Engineer generates UIImage category for the new image(s) ▸ pod update !

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▸ Engineer generates UIImage category for the new image(s)

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WE’RE LAZY

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AUTOMATE ALL THE THINGS!

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Script ALL THE THINGS!

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SCRIPTING ▸ Run from CLI

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SCRIPTING ▸ Run from CLI ▸ Light-weight (no Xcode projects?)

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SCRIPTING ▸ Run from CLI ▸ Light-weight (no Xcode projects?)

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SCRIPTING ▸ Run from CLI ▸ Light-weight (no Xcode projects?) ▸ Tooling

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JANUARY 22ND, 2015 Ayaka Nonaka [11:07 AM] ok time to write..... ruby? or.... swift?!

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JANUARY 22ND, 2015 Ayaka Nonaka [11:07 AM] ok time to write..... ruby? or.... swift?! actually not sure if i want to go down that path

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JANUARY 22ND, 2015 Ayaka Nonaka [11:07 AM] ok time to write..... ruby? or.... swift?! actually not sure if i want to go down that path a 2 day long project is going to turn into like a 7 day long project lol

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JANUARY 22ND, 2015 Ayaka Nonaka [11:07 AM] ok time to write..... ruby? or.... swift?! actually not sure if i want to go down that path a 2 day long project is going to turn into like a 7 day long project lol i might look into swift though

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JANUARY 22ND, 2015 Ayaka Nonaka [11:07 AM] ok time to write..... ruby? or.... swift?! actually not sure if i want to go down that path a 2 day long project is going to turn into like a 7 day long project lol i might look into swift though that might be kind of fun

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JANUARY 22ND, 2015 Eli Perkins [11:08 AM] swift could be fun!

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! CHALLENGE ACCEPTED

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#!/usr/bin/env xcrun swift import Foundation // MARK: - Helpers func writeNewline(outputStream: NSOutputStream) { outputStream.write("\n", maxLength: 1) } func writeLine(outputStream: NSOutputStream, string: String) { outputStream.write(string, maxLength: countElements(string)) writeNewline(outputStream) } func methodDeclarationFromFileName(fileName: String) -> String { let noUnderscoresFileName = fileName.stringByReplacingOccurrencesOfString("_", withString: "", options: .LiteralSearch, range: nil) let uncapitalizedFileName = uncapitalized(noUnderscoresFileName) return "+ (UIImage *)ven_\(uncapitalizedFileName)" } func uncapitalized(string: String) -> String { var index = advance(string.startIndex, 1) let first = string.substringToIndex(index) let rest = string.substringFromIndex(index) return "\(first.lowercaseString)\(rest)" } func fileNameWithoutExtension(fileName: String) -> String { let pattern = "(([a-zA-Z]|_)*)(@2x|@3x)?\\.png" let expression = NSRegularExpression(pattern: pattern, options: nil, error: nil) let result = expression!.matchesInString(fileName, options: nil, range: NSRange(location: 0, length: countElements(fileName))) let textCheckingResult = result[0] as NSTextCheckingResult let range = textCheckingResult.rangeAtIndex(1) return (fileName as NSString).substringWithRange(range) } func imageFileNames(path: String) -> [String] { let fileManager = NSFileManager.defaultManager() let enumerator = fileManager.enumeratorAtPath(path) var fileNames = NSMutableOrderedSet() while let fileName = enumerator?.nextObject() as? String { if fileName.hasSuffix("png") { fileNames.addObject(fileNameWithoutExtension(fileName)) } } return fileNames.array as [String] } // MARK: - Script that generates UIImage+VenmoImages category class let fileNames = imageFileNames("generated-assets") let categoryName = "UIImage+VenmoImages" let headerFileName = "\(categoryName).h" // Generate the interface if let outputStream = NSOutputStream(toFileAtPath: headerFileName, append: false) { outputStream.open() writeLine(outputStream, "#import ") writeNewline(outputStream) writeLine(outputStream, "@interface UIImage (VenmoImages)") writeNewline(outputStream) for fileName in fileNames { writeLine(outputStream, "\(methodDeclarationFromFileName(fileName));") } writeNewline(outputStream) writeLine(outputStream, "@end") outputStream.close() } else { println("Unable to open interface file") } // Generate the implementation if let implOutputStream = NSOutputStream(toFileAtPath: "\(categoryName).m", append: false) { implOutputStream.open() writeLine(implOutputStream, "#import \"\(headerFileName)\"") writeNewline(implOutputStream) writeLine(implOutputStream, "@implementation UIImage (VenmoImages)") writeNewline(implOutputStream) for fileName in fileNames { writeLine(implOutputStream, "\(methodDeclarationFromFileName(fileName))") writeLine(implOutputStream, "{") writeLine(implOutputStream, " return [UIImage imageNamed:@\"Venmo.bundle/\(fileName)\"];") writeLine(implOutputStream, "}") writeNewline(implOutputStream) } writeLine(implOutputStream, "@end") implOutputStream.close() } else { println("Unable to open implementation file") }

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SWIFT ▸ familiar API’s

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SWIFT ▸ familiar API’s ▸ “light” feeling language

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SWIFT ▸ familiar API’s ▸ “light” feeling language ▸ overly protective compiler is a caring compiler

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REDUCE LANGUAGE DEPENDENCIES

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NON “PRODUCTION” USE

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JUST ANOTHER REASON TO WRITE Swift

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XCRUN SWIFT HELLO-WORLD.SWIFT

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CHMOD +X HELLO-WORLD.SWIFT

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#!/USR/BIN/ENV XCRUN SWIFT

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./HELLO-WORLD.SWIFT

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Live Demo!

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DEPENDENCY MANAGEMENT?

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GIT SUBMODULES ▸ Simple, does very little. ▸ Maybe too little?

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COCOAPODS ▸ Swift! ▸ Does dependency management. ▸ Relies on Xcode project.

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CARTHAGE ▸ Swift! ▸ Does dependency management. ▸ Manually add framework to project.

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CARTFILE github "jdhealy/PrettyColors" github "Alamofire/Alamofire"

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$ CARTHAGE BOOTSTRAP *** No Cartfile.resolved found, updating dependencies *** Fetching PrettyColors *** Fetching Alamofire *** Checking out Alamofire at "1.1.4" *** Checking out PrettyColors at "v1.0.0" *** xcodebuild output can be found in /var/folders/blah *** Building scheme "Alamofire iOS" in Alamofire.xcworkspace *** Building scheme "Alamofire OSX" in Alamofire.xcworkspace *** Building scheme "PrettyColors iOS" in PrettyColors.xcodeproj *** Building scheme "PrettyColors Mac" in PrettyColors.xcodeproj

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➜ swiftsummit git:(master) ✗ ls Carthage/Build/iOS Alamofire.framework PrettyColors.framework

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/LIBRARY/FRAMEWORKS ?

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➜ swiftsummit git:(master) ✗ swift -help OVERVIEW: Swift compiler USAGE: swift [options] OPTIONS: ... -F Add directory to framework search path

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#!/usr/bin/env xcrun swift -F Carthage/Build/iOS

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THE MISSING STUFF ▸ Auto-completion

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THE MISSING STUFF ▸ Auto-completion ▸ A better way to do dependency management

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THE MISSING STUFF ▸ Auto-completion ▸ A better way to do dependency management ▸ More tools

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▸ Keithbsmiley/swift.vim ▸ jdhealy/PrettyColors ▸ thoughtbot/Argo ▸ kylef/CLIKit ▸ nomothetis/SemverKit ▸ BananaKit? ! ▸ ???

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PLOT TWIST

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BIT.LY/SWIFTSCRIPTING

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??? @AYANONAGON

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