This script transforms Spring's .properties file into different formats: Docker Compose environment variables/env-file or Asciidoctor Table

properties.kts

import java.io.File

if (args.size < 2) {
    println("This script transforms a .properties file in different formats.")
    println("Please provide arguments: <file> <mode>")
    println("Modes:")
    println("  - environment: Print out properties in a Docker Compose environment attribute format")
    println("  - env-file: Print out properties in a Docker Compose environment file attribute format")
    println("  - configmap: Print out properties in a Kubernetes Configmap (YAML) format")
    println("  - adoc-table: Print out an ASCII Doctor table")
    println("  - adoc-table-small-example: Print out an ASCII Doctor table with small example")
} else {
    val filePath = args[0]
    val mode = args[1]

    var previousLine = ""

    File(filePath).forEachLine {
        // println("Prev: " + previousLine)
        if (it.isEmpty()) {
            if (!mode.startsWith("adoc-table")) println()
        }
        else if (it.startsWith("#")) {
            if (!mode.startsWith("adoc-table")) println(it)
        }
        else {
            val regex = """([a-zA-Z_\.-]*)=([^#]*)\w*(# (.*))?""".toRegex()
            val matchResult = regex.find(it)
            if (matchResult != null) {
                val name = matchResult.groupValues?.get(1)
                val value = matchResult.groupValues?.get(2)
                val _comment = matchResult.groupValues?.get(4) // Comments are not allowed in .properties file in the same line as key-value definition!
                val comment = if (_comment == null || _comment == "") { if (previousLine.startsWith("# ")) previousLine.substring(2) else "" } else _comment
                val env_name = name.replace(".", "_").replace("-", "_")
                val env_value = if (mode.startsWith("adoc-table") && env_name == "infrastructure_keycloak_realmKey") "/" else value

                when(mode) {
                    "environment" -> println("- " + env_name + "=" + env_value)  // + (if (!comment.isEmpty()) " # " + comment else comment))
                    "env-file" -> println(env_name + "=" + env_value)  // + (if (!comment.isEmpty()) " # " + comment else comment))
                    "configmap" -> println(env_name + ": \"" + env_value + "\"")  // + (if (!comment.isEmpty()) " # " + comment else comment))
                    "adoc-table" -> println("|" + env_name + "\n|" + comment + "\n\n" + "Example value: " + env_value?.trimEnd() + "\n\n")
                    "adoc-table-small-example" -> println("|" + env_name + "\n|" + (if (!comment.isEmpty()) comment + " +\n" else "") + "[.small]#Example value: " + env_value?.trimEnd() + "#\n")
                }
            }
            else { println("?") }
        }

        previousLine = it
    }
}