This project is no longer supported.

See https://github.com/holgerbrandl/kscript for an actively maintained alternative.

Kotlin Scripting Support

Provides scripting support for Kotlin on *nix-based systems. e.g.

#!/usr/bin/env kotlins
println("Hello from Kotlin!")
for (arg in args) {
    println("arg: $arg")
}

Installation

Assuming you have ~/bin and kotlinc-jvm in your PATH:

$ curl -s https://raw.githubusercontent.com/andrewoma/kotlin-script/master/kotlins > ~/bin/kotlins && chmod u+x ~/bin/kotlins

Otherwise, download the kotlins script to any location in your PATH.

If you're looking for kotlinc-jvm, it is available via homebrew or 1.0.5 can be downloaded from here.

Features

• Runs kotlin scripts with or without a main method (wrapping in a main method automatically if required)
• Runs standard kotlin source files (or modules), compiling automatically
• Caches compiled scripts. "Hello, world" will take around 3s on the first run and 200ms thereafter.
• Supports a classpath option, automatically building the appropriate kotlin module on the fly.

Limitations

• Cygwin is supported, but the script is quite slow due to the high overhead of launching processes under Windows.
• For modules, the module main method must be in a file called main.kt.

Examples

There are various examples in the examples directory. Here are a subset of them:

A script with an explicit main method:

#!/usr/bin/env kotlins

fun main(args: Array<String>) {
    Hello().sayHello()
}

class Hello {
    fun sayHello() {
        println("Hello from Kotlin!")
    }
}

A script using a classpath. Note: Using #!/usr/bin/env with options does not work across platforms. Either the actual path to the command must be used, or using indirection as shown below.

#!/bin/sh 
exec kotlins -DmySysProp=somevalue -cp log4j-1.2.14.jar "$0" "$@"
!#
import org.apache.log4j.*

val logger = Logger.getLogger("mymodule").sure();

fun main(args: Array<String>) {
    BasicConfigurator.configure();
    logger.info("Hello from Kotlin via log4j! mySysProp=${System.getProperty("mySysProp")}")
}

Running a standard kotlin source file:

$ kotlins mykotlinfile.kt

mvncp

In response to #1, I've included mvncp in the extras folder. mvncp is a utility that can resolve classpaths from maven repositories (automatically downloading and resolving transitive dependencies if required). It requires ruby and maven to be installed and included in your PATH.

Example: resolving a classpath

$ mvncp org.springframework:spring-core:3.1.1.RELEASE

Will write write the following to the stdout

/Users/andrew/.m2/repository/commons-logging/commons-logging/1.1.1/commons-logging-1.1.1.jar:/Users/andrew/.m2/repository/org/springframework/spring-asm/3.1.1.RELEASE/spring-asm-3.1.1.RELEASE.jar:/Users/andrew/.m2/repository/org/springframework/spring-core/3.1.1.RELEASE/spring-core-3.1.1.RELEASE.jar

Example: show the dependency tree

$ mvncp --tree org.springframework:spring-core:3.1.1.RELEASE
org.springframework:spring-core:jar:3.1.1.RELEASE
   org.springframework:spring-asm:jar:3.1.1.RELEASE
   commons-logging:commons-logging:jar:1.1.1

mvncp can be used in conjunction with the kotlin script as follows:

#!/bin/sh 
exec kotlins -DmySysProp=somevalue -cp `mvncp log4j:log4j:1.2.14` "$0" "$@"
!#
import org.apache.log4j.*

val logger = Logger.getLogger("mymodule").sure();

fun main(args: Array<String>) {
    BasicConfigurator.configure();
    logger.info("Hello from Kotlin via log4j! mySysProp=${System.getProperty("mySysProp")}")
}

Alternatives

kotlin-scripting-kickstarter provides a Gradle based alternative. The main advantage of the kickstarter approach is that it supports full IDE development of scripts.

Status

Last verified Kotlin version: 1.0.5