gradle-kotlin-dsl-plugin-buildSrc

Simple internal (located in buildSrc) Gradle plugin example, written in Kotlin using Gradle Kotlin DSL

• Travis CI
• GitHub Pages documentation
• GitHub daggerok/gradle-kotlin-dsl-plugin-buildSrc repository

generate a project

gradle init --type=basic --dsl=kotlin --project-name=gradle-kotlin-dsl-plugin-buildSrc

create buildSrc

mkdir -p buildSrc/src/main/kotlin/com/github/daggerok/plugin

configure plugin

create buildSrc/build.gradle.kts file:

plugins {
  `kotlin-dsl`
}

repositories { // required by kotlin-dsl plugin dependencies
  jcenter()
}

gradlePlugin {
  plugins {
    register("hello-plugin") {
      id = "hello"
      implementationClass = "com.github.daggerok.plugin.HelloPlugin"
    }
  }
}

configure<KotlinDslPluginOptions> {
  experimentalWarning.set(false)
}

plugin implementation

prepare structure for your configuration extension

create ./buildSrc/src/main/kotlin/com/github/daggerok/plugin/HelloPlugin.kt file:

open class HelloExtension {
  var greeting: String = "Hello"
  var name: String = "buddy"
}

prepare plugin

class HelloPlugin : Plugin<Project> {
  override fun apply(project: Project): Unit = project.run {
    val hello = project.extensions.create<HelloExtension>("HelloExtension")
    project.extensions.add("hello", hello)
    tasks.register("hello") {
      doLast {
        println("${hello.greeting.capitalize()}, ${hello.name.capitalize()}!")
      }
    }
  }
}

plugin usage

plugins {
  hello
}

hello {
  greeting = "hola"
  name = "pablo"
}

./gradlew hello
# output
Hola, Pablo!

resources

• Writing Custom Plugins
• Gradle Kotlin DSL samples
• Gradle Kotlin DSL Primer
• Gradle Tutorials