BuildingDeveloperToolswithKotlin andGradle

BreandanConsidineGIDS2017

WhyDeveloperTools?• Syntaxmanipulation• Typingcompletions• Staticcodeanalysis• UI/UXcomponents• Languagesupport• Frameworksupport

WhyKotlin?• IntelliJPlatform/Eclipseintegration• Javalanguage/JVMinteroperability• Simplifiesframeworkinteractions• Domainspecificlanguages• Functionalprogramming• Buildtoolsintegration

WhyGradle?• Comprehensivetoolingsupport• Cross-platformIDE• Gradle toolingAPI

• Language-nativebuildscripts• Vibrantpluginecosystem• Gradlew isawesome!

public class Singleton {private Singleton() {}private static instance;public static Singleton getInstance() {

if(instance == null)instance = new Singleton();

return instance;}public void doSomething() {}

}

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10:

Singletonpattern:Java

Singleton.doSomething()

Singletonpattern:Java

Singleton.getInstance().doSomething();

Singleton.doSomething()

object Singleton {fun doSomething() {}

}

Singletonpattern:Kotlin1:2:3:

LazyInitialization

public class Singleton {private Singleton() {}private static instance;public static Singleton getInstance() {

if(instance == null)instance = new Singleton();

return instance;}public void doSomething() {}

}

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10:

Singletonpattern:Java

IntelliJPlatformSDK

ActionManager.getInstance().getAction("MyAction")…

MyAction…

foo(bar)

bar.foo()

Extensionfunctions

Extendanylibraryclass

fun String.wordCount(s: String) {return s.split(" ")

.filter { it.length > 3 }}

"hello to the world".wordCount()

Extendanylibraryclass

val File.extension: Stringget() = name.split(".").last()

myFile.extension

LazyInitializationval resource: Resource by lazy {println("Initializing…")configureResource()

}

println(resource)println(resource)

UIConfiguration1: 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: }

Gradle ScriptKotlin (GSK)

buildscript {repositories {

gradleScriptKotlin()}

dependencies {classpath(kotlinModule("gradle-plugin"))

}}

GradlePluginsplugins {

id("org.jetbrains.intellij") version "0.2"}

apply {plugin("org.jetbrains.intellij")plugin("kotlin")

}

GradleIntelliJPluginintellij {

pluginName = "MyPlugin"updateSinceUntilBuild = false

}

group = "com.group"version = "1.0"

GradleIntelliJPlugin// Also useful for OSS contributors!intellij {

runIde { args project.projectDir.path

}

downloadSources = false }

// Run `./gradlew runIde` to open project

LinksandResources• KotlinforPluginDevelopers• KotlinGradlePlugin• GradleScriptKotlin (GSK)• gradle-intellij-plugin• KotlinPluginforEclipse• goomph:IDEasabuildartifact

www.modsummit.com

www.developersummit.com