Sample Kotlin Script Illustrating how to write a custom Kotlin DSL

printer.kts

#!/usr/bin/env kscript

/**
 * Define a Printer class that will prefix the message with given
 * symbol and apply a `postfix` to the end of the message.
 *
 * The methods will be available for the inline function
 */
class Printer(private val postfix: String) {
    fun asterix(message: String) {
        println("* $message $postfix")
    }
    fun plus(message: String) {
        println("+ $message $postfix")
    }
}

/**
 * Create a lambda Extention Function to the Printer class
 */
typealias PrinterDSL = Printer.() -> Unit

/**
 * Define the actual entry point of the Printer DSL using defined `PrinterDSL`
 * typealias as `trailing lambda` of the function
 */
fun printer(postfix: String = "", printerDSL : PrinterDSL): Printer {
    return Printer(postfix).apply(printerDSL)
}

// Sample Printer DSL Usage
printer("[debug]") {
    asterix("hello")
    plus("world")
}

/*
 * REFERENCES:
 *   1. blog: https://www.grokkingandroid.com/creating-kotlin-dsls/
 *   2. kscript: https://github.com/holgerbrandl/kscript
 */