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Building Developer Tools with Kotlin and Gradle Breandan Considine GIDS 2017

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Why Developer Tools? • Syntax manipulation • Typing completions • Static code analysis • UI/UX components • Language support • Framework support

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Why Kotlin? • IntelliJ Platform / Eclipse integration • Java language / JVM interoperability • Simplifies framework interactions • Domain specific languages • Functional programming • Build tools integration

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Why Gradle? • Comprehensive tooling support • Cross-platform IDE • Gradle tooling API • Language-native buildscripts • Vibrant plugin ecosystem • Gradlew is awesome!

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public class Singleton { private Singleton() {} private static instance; public static Singleton getInstance() { if(instance == null) instance = new Singleton(); return instance; } public void doSomething() {} } 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: Singleton pattern: Java

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Singleton.doSomething() Singleton pattern: Java Singleton.getInstance().doSomething();

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Singleton.doSomething() object Singleton { fun doSomething() {} } Singleton pattern: Kotlin 1: 2: 3: Lazy Initialization

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public class Singleton { private Singleton() {} private static instance; public static Singleton getInstance() { if(instance == null) instance = new Singleton(); return instance; } public void doSomething() {} } 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: Singleton pattern: Java

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IntelliJ Platform SDK ActionManager.getInstance() .getAction("MyAction")… MyAction…

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foo(bar) bar.foo() Extension functions

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Extend any library class fun String.wordCount(s: String) { return s.split(" ") .filter { it.length > 3 } } "hello to the world".wordCount()

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Extend any library class val File.extension: String get() = name.split(".").last() myFile.extension

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Lazy Initialization val resource: Resource by lazy { println("Initializing…") configureResource() } println(resource) println(resource)

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UI Configuration 1: val panel = panel { 2: noteRow("Login:") 3: row("Username:") { userField() } 4: row("Password:") { passwordField() } 5: row { 6: rememberCheckBox() 7: right { 8: link("Forgot?") { browse(forgot) } 9: } 10: } 11: noteRow("No account? $signupLink") 12: }

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Gradle Script Kotlin (GSK) buildscript { repositories { gradleScriptKotlin() } dependencies { classpath(kotlinModule("gradle-plugin")) } }

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Gradle Plugins plugins { id("org.jetbrains.intellij") version "0.2" } apply { plugin("org.jetbrains.intellij") plugin("kotlin") }

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Gradle IntelliJ Plugin intellij { pluginName = "MyPlugin" updateSinceUntilBuild = false } group = "com.group" version = "1.0"

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Gradle IntelliJ Plugin // Also useful for OSS contributors! intellij { runIde { args project.projectDir.path } downloadSources = false } // Run `./gradlew runIde` to open project

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Links and Resources • Kotlin for Plugin Developers • Kotlin Gradle Plugin • Gradle Script Kotlin (GSK) • gradle-intellij-plugin • Kotlin Plugin for Eclipse • goomph: IDE as a build artifact • GIDS Plugin (from live code)