Add Kotlin scripting support

[chris922]

I saw that openHAB supports JSR223 and within the PR #8772 it looks like it's quite easy to add new languages.

Because I personally prefer Kotlin over Groovy I thought it maybe can added as a scripting engine as well.

I am personally not deep into JSR223 stuff and openHAB development, but I already had a look if Kotlin provides a JSR223 compatible script factory and indeed it does: KotlinJsr223JvmLocalScriptEngineFactory.

Maybe helpful resources:

• https://kotlinlang.org/docs/reference/whatsnew11.html#javaxscript-support
• https://github.com/JetBrains/kotlin/blob/master/libraries/tools/kotlin-script-util/src/main/kotlin/org/jetbrains/kotlin/script/jsr223/KotlinJsr223ScriptEngineFactoryExamples.kt
• https://github.com/JetBrains/kotlin/tree/master/libraries/examples/kotlin-jsr223-local-example

If you prefer I could try with a PR similar to #8772, but I really don't know if some prework was done and also how to easily setup a test-environment so that I can verify kotlin-script is working. If you can provide me some resources how to start I would give it a try as long as you don't have time left for this.

[wborn]

I had a brief look at this already but it was not as easy as the Groovy add-on. :wink: I read that the Kotlin performance was really bad compared to other JSR223 languages. The Kotlin artifacts are also not OSGi friendly with shared packages and a lot of dependencies.

[chris922]

Ah.. Pity! Thanks for the response, maybe someone can create a ticket on Kotlin side so that they maybe improve their JSR223 support?

[Legion2]

The Kotlin artifacts are also not OSGi friendly with shared packages and a lot of dependencies.

@wborn Which kotlin artifacts would be required for the scripting support?

[wborn]

I got rid of the code after my experiments and no longer remember all the details. 🤔

[cable729]

https://github.com/Kotlin/kotlin-script-examples/blob/master/jvm/jsr223/jsr223.md may have some pointers