JBang Cheat Sheet

///usr/bin/env jbang "$0" "$@" ; exit $? 

class Hello { 
    public static void main(String[] args) {
          System.out.println("Hello World!");
    }
}

$ jbang Hello.java
$ jbang --debug Hello.java
$ chmod u+x 
$ ./Hello.java

$ jbang template list
$ jbang init --template=cli helloworld.java

$ jbang init HelloCli.java "generate hello command with picocli library"

//JAVAC_OPTIONS -parameters
//JAVA_OPTIONS -Dnick=xxx
//JAVA_OPTIONS -Dserver.port=8081 -D spring.application.name=app1
//PREVIEW

///usr/bin/env jbang "$0" "$@" ; exit $? 

//PREVIEW
//JAVA 21

void main() {
    System.out.println("Hello World");
}

//SOURCES UserService.java
//SOURCES impl/UserServiceImpl.java

//FILES application.properties
//FILES META-INF/resources/index.html=index.html
//FILES META-INF/resources/jquery.js=https://code.jquery.com/jquery-3.6.0.min.js
//FILES templates/HelloWorld.txt.mtl=templates/HelloWorld.txt.mtl

**Resource import format**: //FILES <mountpoint>[=<sourcefile>]

///usr/bin/env jbang "$0" "$@" ; exit $? 

//KOTLIN 1.8.21
//DEPS org.jetbrains.kotlin:kotlin-bom:1.8.21@pom
//DEPS org.jetbrains.kotlin:kotlin-stdlib

public fun main() {
    println("Hello World");
}

///usr/bin/env jbang "$0" "$@" ; exit $? 

//GROOVY 4.0.12

println("Hello World");

///usr/bin/env jbang "$0" "$@" ; exit $?
//DEPS net.datafaker:datafaker:1.9.0

import net.datafaker.Faker;

Faker faker = new Faker();

$ jbang --native Hello.java

// https://github.com/linux-china/jbang-spring-native
// https://github.com/GoodforGod/graalvm-hint

//DEPS systems.manifold:manifold-all:2023.1.10
//DEPS org.projectlombok:lombok:1.18.28
//DEPS org.slf4j:slf4j-simple:2.0.7
//DEPS libs/local.jar
//DEPS eu.maveniverse.maven.plugins:toolbox:0.1.9:cli@fatjar

//DEPS org.springframework.boot:spring-boot-dependencies:2.7.11@pom
//DEPS org.springframework.boot:spring-boot-starter

//DEPS io.quarkus:quarkus-bom:2.9.2.Final@pom
//DEPS io.quarkus:quarkus-resteasy

//REPOS central,spring-release=https://repo.spring.io/release
//REPOS central,spring-milestone=https://repo.spring.io/milestone

**Well-known repositories**:

* central - https://repo1.maven.org/maven2/
* google - https://maven.google.com/
* jitpack - https://jitpack.io/

$ jbang alias add --name hello https://github.com/jbangdev/jbang-examples/blob/HEAD/examples/helloworld.java
$ jbang hello 
$ jbang alias list
$ jbang alias list --show-origin

{
  "aliases": {
    "hello": {
      "script-ref": "hello.java",
      "description": "Script that says hello back for each argument"
    }
}

$ jbang catalog add --name acme acme
$ jbang catalog add --name mycatalog acme/mycatalog
$ jbang catalog list

$ jbang app install <scriptRef> 
$ $ jbang app install --name app1 <scriptRef> 
$ jbang app list
$ jbang app uninstall <name>

///usr/bin/env jbang "$0" "$@" ; exit $?
//JAVA 17
//DEPS info.picocli:picocli:4.7.3
//SOURCES src
//FILES resources

export OPENAI_API_KEY=sk-xxxxxxx-x-xxxxxx
jbang init gh.java "connect to github an fetch all repositories under jbangdev and collect how many stars they have"