Drive kotlinc from build.gradle

build.gradle

// Execute Kotlin script with:
// 
//    gradle -q foo
//
 
// For correctness, we're going to configure two independent classpath configurations, one for kotlinc and the other for the
// script(s) we want to execute.

configurations {
  kotlinc
  scripts
}

ext.kotlinVersion = "1.1.0-rc-91"

repositories {
  maven { url 'http://dl.bintray.com/kotlin/kotlin-eap-1.1' }
  jcenter()
}

def kotlinModule(String name) {
  "org.jetbrains.kotlin:kotlin-$name:$kotlinVersion"
}

dependencies {

  kotlinc(kotlinModule("compiler"))
  kotlinc(kotlinModule("stdlib"))
  kotlinc(kotlinModule("runtime"))
  kotlinc(kotlinModule("reflect"))
  kotlinc(kotlinModule("script-runtime"))

  // Our simple script depends only on the stdlib but additional dependencies could be
  // added to this configuration.
  scripts(kotlinModule("stdlib"))
}

def kotlinHome = file("$buildDir/kotlin")

task prepareKotlinHome(type: Copy) {
  from(configurations.kotlinc)
  into("$kotlinHome/lib")
  rename {
    // strip the version suffix to satisfy the compiler
    (it - "-${kotlinVersion}.jar") + ".jar"
  }
}

task foo(type: JavaExec) {
  group "My"
  description "Executes foo.kts"

  dependsOn prepareKotlinHome
  main = "org.jetbrains.kotlin.cli.jvm.K2JVMCompiler"
  classpath = configurations.kotlinc
  args(
    "-kotlin-home", kotlinHome,
    "-classpath", configurations.scripts.asPath,
    "-script", "foo.kts")
}

foo.kts

println("Hello from Kotlin script!")