Kotlin

• endung: .main.kts (siehe https://github.com/Kotlin/kotlin-script-examples/blob/master/jvm/main-kts/MainKts.md)
• ausführen:
  • ./hello-world.main.kts (mit shebang: #!/usr/bin/env kotlin)
  • kotlin hello-world.main.kts
  • kotlinc -script hello-world.main.kts

die annotation @file:CompilerOptions unterstützt aktuell noch nicht -Xplugin, daher muss man das kotlin script mit kotlin -Xplugin starten und kann das shebang nicht verwenden

> # ./json.main.kts deserialize
> kotlin_home="/opt/homebrew/Cellar/kotlin/2.2.0"
> kotlin -Xplugin="${kotlin_home}/libexec/lib/kotlin-serialization-compiler-plugin.jar" json.main.kts -- deserialize
Data(int=42, bool=true, string=cool, nullable=null)

> # ./json.main.kts serialize
> kotlin_home="/opt/homebrew/Cellar/kotlin/2.2.0"
> kotlin -Xplugin="${kotlin_home}/libexec/lib/kotlin-serialization-compiler-plugin.jar" json.main.kts -- serialize
{
    "int": 42,
    "bool": true,
    "string": "cool",
    "nullable": null
}

json.main.kts

#!/usr/bin/env kotlin
 
// not yet supported
// @file:CompilerOptions("-Xplugin=kotlin-serialization-compiler-plugin.jar")
@file:Repository("https://repo.maven.apache.org/maven2")
@file:DependsOn(
    "org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0"
)
 
import kotlinx.serialization.*
import kotlinx.serialization.json.*
 
val json = Json {
    ignoreUnknownKeys = true
    prettyPrint = true
}
 
val command = args
    .firstOrNull()
    ?.lowercase()
    ?.let { Commands.of(it) }
 
when (command) {
    Commands.Deserialize -> deserialize()
    Commands.Serialize -> serialize()
    else -> {
        val name = (this::class.simpleName ?: "*")
            .lowercase()
            .replace("_main", "")
            .replace("_", "-")
            .let { "${it}.main.kts" }
        val cmds = Commands.entries
            .joinToString(separator = "|", prefix = "<", postfix = ">") {
                it.name.lowercase()
            }
        "Usage: $name $cmds"
    }
}.also { result ->
    println(result)
}
 
fun deserialize(): String {
    val serialized = """
        {
            "int": 42,
            "bool": true,
            "string": "cool",
            "nullable": null
        }
    """.trimIndent()
    val deserialized = json.decodeFromString<Data>(serialized)
    return deserialized.toString()
}
 
fun serialize(): String {
    val deserialized = Data(
        42,
        true,
        "cool",
        null,
    )
    val serialized = json.encodeToString(deserialized)
    return serialized
}
 
enum class Commands {
    Deserialize,
    Serialize;
 
    companion object {
        fun of(value: String?) = entries.find { it.name.lowercase() == value?.lowercase() }
    }
}
 
@Serializable
data class Data(
    val int: Int,
    val bool: Boolean,
    val string: String,
    val nullable: String?,
)

Installation:

> cd /usr/ports/java/openjdk21 && make clean install clean

> git clone git@github.com:JetBrains/kotlin.git ~/kotlin
> cd ~/kotlin

> vim local.properties
kotlin.build.isObsoleteJdkOverrideEnabled=true
kotlin.native.enabled=true
org.gradle.java.installations.auto-download=false

> ./gradlew :kotlin-native:bundle

Test-Skript:

> vim /tmp/hello.kt
fun main() {
    println("Hello Kotlin/Native!")
}

Kompilertest:

> ~/kotlin/kotlin-native/dist/bin/kotlinc-native" /tmp/hello.kt -o /tmp/hello
> /tmp/hello.kexe