Bonjour, I have a Kotlin script that I need to run...

# scripting

[jmfayard]

Bonjour, I have a Kotlin script that I need to run on heroku (gradle buildpack) but I have no idea how to do sdk install kotlin or snap install kotlin on heroku and Google isn't my friend either.
Any idea?

[Vampire]

You mean a .main.kts script?
I'd "simply" run it through Gradle like

repositories {
    mavenCentral()
}

val compilerClasspath by configurations.creating {
    isCanBeConsumed = false
}

val scriptClasspath by configurations.creating {
    isCanBeConsumed = false
}

dependencies {
    compilerClasspath(kotlin("compiler", "1.7.0"))
    compilerClasspath(kotlin("scripting-compiler", "1.7.0"))
    add(scriptClasspath.name, kotlin("main-kts", "1.7.0"), closureOf<ExternalModuleDependency> { isTransitive = false } as groovy.lang.Closure<Any>)
}

val foo by tasks.registering(JavaExec::class) {
    inputs.file(file(".github/workflows/test.main.kts"))
    outputs.file(file(".github/workflows/test.yaml"))
    classpath(compilerClasspath)
    mainClass.set(K2JVMCompiler::class.qualifiedName)
    args("-no-stdlib", "-no-reflect")
    args("-classpath", scriptClasspath.asPath)
    args("-script", file(".github/workflows/test.main.kts").absolutePath)
}

[jmfayard]

it works, I have tested, thanks

[Vampire]

Of course it works, I needed a 96 messages thread in this slack to get it working. :-D

[Vampire]

If you are curious: https://kotlinlang.slack.com/archives/C0BT46EL8/p1655415795596189

[jmfayard]

Amazing

[jmfayard]

Do you think it will be useful if I publish a small gradle plugin to abstract away that boilerplate?

[Vampire]

Sure, I planned to do it, but didn't find the time and probably will not soon.
You're welcome to do it instead. :-)

[Vampire]

Actually I expected that to happen when I wrote my first answer here. 😄

[jmfayard]

😄

[jmfayard]

https://youtrack.jetbrains.com/issue/KT-53707/The-Kotlin-Gradle-plugin-should-allow-to-wrap-a-Kotlin-script-inside-a-Gradle-task

[jmfayard]

@Vampire it would be even better if it's implemented in the Kotlin Gradle plugin directly, so I first opened an issue about this, thanks for your help.

[jmfayard]

It could be straightforward to run a Kotlin script via Gradle,
so that your build doesn't break if the Kotlin CLI is not installed
If you think that's important, you can follow/comment this issue where I share Björn Kautler's solution
https://youtrack.jetbrains.com/issue/KT-53707/The-Kotlin-Gradle-plugin-should-allow-to-wrap-a-Kotlin-script-inside-a-Gradle-task

[Big Chungus]

I think this would be much more appropriate for the gradle itself as an expansion of kotlin dsl

[Vampire]

Nah, then you would be constraint to the version Gradle embeds.
Besides that it currently does not work with the embedded Kotlin compiler, but needs the standalone one.