Build source jar with Gradle Kotlin DSL?

Question

This question asks how to build a SourceJar with Gradle. How can I do the same with the Gradle Kotlin DSL?

The gradle code would be:

task sourcesJar(type: Jar, dependsOn: classes) {
    classifier = 'sources'
    from sourceSets.main.allSource
}

task javadocJar(type: Jar, dependsOn: javadoc) {
    classifier = 'javadoc'
    from javadoc.destinationDir
}

artifacts {
    archives sourcesJar
    archives javadocJar
}

Answer 1

The following will work:

val sourcesJar by creating(Jar::class) {
    dependsOn(JavaPlugin.CLASSES_TASK_NAME)
    classifier = "sources"
    from(sourceSets["main"].allSource)
}

val javadocJar by creating(Jar::class) {
    dependsOn(JavaPlugin.JAVADOC_TASK_NAME)
    classifier = "javadoc"
    from(tasks["javadoc"])
}

artifacts {
    add("archives", sourcesJar)
    add("archives", javadocJar)
}

A complete build.gradle.kts would look like this:

plugins {
    kotlin("jvm") version "1.2.71"
}

repositories {
    mavenCentral()
}

dependencies {
}

tasks {
    val sourcesJar by creating(Jar::class) {
        dependsOn(JavaPlugin.CLASSES_TASK_NAME)
        classifier = "sources"
        from(sourceSets["main"].allSource)
    }

    val javadocJar by creating(Jar::class) {
        dependsOn(JavaPlugin.JAVADOC_TASK_NAME)
        classifier = "javadoc"
        from(tasks["javadoc"])
    }

    artifacts {
        add("archives", sourcesJar)
        add("archives", javadocJar)
    }
}

Answer 2

With Gradle 5.3.1, this is a little nicer and avoids deprecated API:

tasks {    
    val sourcesJar by creating(Jar::class) {
        archiveClassifier.set("sources")
        from(sourceSets.main.get().allSource)
    }

    val javadocJar by creating(Jar::class) {
        dependsOn.add(javadoc)
        archiveClassifier.set("javadoc")
        from(javadoc)
    }

    artifacts {
        archives(sourcesJar)
        archives(javadocJar)
        archives(jar)
    }
}

Task assemble will create all the artifacts.

Answer 3

With Gradle 5.1 you can do something like this

tasks {
    val sourcesJar by registering(Jar::class) {
        classifier = "sources"
        from(sourceSets.main.get().allSource)
        dependsOn(classes)
    }
    val javadocJar by registering(Jar::class) {
        classifier = "javadoc"
        from(javadoc.get().destinationDir)
        dependsOn(javadoc)
    }
}