How to run kotlin script from command line?

Question

How can I run kotlin script from command line? Without maven, gradle or kotlin-DSL-gradle, only command line options.

I have two kotlin files in the play folder

user.kt

data class User(val name: String)

play.kts

fun main() {
  val user = User("Jim")
  println("Hello ${user.name}")
}

It doesn't work

kotlinc -script play.kts
error: unresolved reference: User (play.kts:4:14)
play.kts:4:14: error: unresolved reference: User
  val user = User("Jim")

But if I rename it to play.kt and run with command below it works.

kotlinc . -include-runtime -d play.jar && java -jar play.jar

Why it is so, and how to make it work?

somethingsomething · Accepted Answer · 2021-07-26 12:57:54Z

In scripting mode there is nothing that links those two files together, so the compiler has no way of knowing where to find the User class, since by default it is just parsing the play.kts file.

You have a couple of options to achieve what you want:

Rename your play script to play.main.kts, rename user.kt to user.kts, add @file:Import("user.kts") to the top of the play script and now run it with your first attempted command
Compile the user.kt file (note it's not a kts, so it needs to be compiled to be usable) with kotlinc user.kt, this will compile it to user.class in the current dir, and then add the current dir to the classpath of the script runner: kotlinc -cp . -script play.kts

The first is probably the most versatile, it also allow you to add remote dependencies with @file:DependsOn(<gradle-style-dep>). All of that only works if the filename ends in .main.kts though.

Note that you still need to execute that main function in your script in order to do anything, so add main() below what you have.

You can puzzle this information and more together on your own using https://github.com/Kotlin/KEEP/blob/master/proposals/scripting-support.md , but imo this is all pretty badly documented (although it works well)

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