Use GraalPy in a Java embedding with JBang

This repository makes it easy to create a JBang app that uses GraalPy & Java.

See our example graalpy.java for a template. You can use PIP comments to add packages. Native image builds should just work. Modify the main method to suit your use case, the other two classes in the file are just helpers that you should be able to ignore.

Simple example to get started

graalpy-jbang/src/test/resources/graalpy.java

Lines 1 to 5 in ad28067

	//DEPS org.graalvm.python:python-language:23.1.0
	//DEPS org.graalvm.python:python-resources:23.1.0
	//DEPS org.graalvm.python:python-launcher:23.1.0
	//DEPS https://github.com/timfel/graalpy-jbang/tree/main#:SNAPSHOT
	//PIP termcolor

graalpy-jbang/src/test/resources/graalpy.java

Lines 48 to 69 in ad28067

	public class graalpy {
	public static void main(String[] args) {
	try (Context context = VirtualGraalPyContext.getContext()) {
	switch (args.length) {
	case 0:
	context.eval("python", "import site; site._script()");
	break;
	case 1:
	context.eval("python", args[0]);
	break;
	default:
	throw new IllegalArgumentException("The main() helper only takes 0-1 arguments.");
	}
	} catch (PolyglotException e) {
	if (e.isExit()) {
	System.exit(e.getExitStatus());
	} else {
	throw e;
	}
	}
	}
	}

More interesting example "application"