PicoCLI Native Support (fixes #1153)

[vorburger]

Relates to #337, fixes #1153, illustrates #1154.

[gemini-code-assist]

Hello @vorburger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

Summary of Changes

This pull request introduces native support for PicoCLI, addressing issue #1153. It involves adding the picocli-codegen dependency and integrating it as a Java plugin in the Bazel build system. The changes also include enabling native image generation for the demo application and refactoring the BUILD files to accommodate the new dependencies and plugin.

Highlights

• PicoCLI Integration: The pull request adds info.picocli:picocli-codegen:4.7.6 as a new Maven dependency in MODULE.bazel and maven_install.json to enable PicoCLI's code generation capabilities.
• Bazel Plugin Configuration: A new java_plugin named picocli is added in tools/bazel/java_plugin/BUILD, utilizing picocli.codegen.aot.graalvm.processor.NativeImageConfigGeneratorProcessor to generate native image configurations.
• BUILD File Refactoring: The java_binary target enola in java/dev/enola/cli/BUILD is modified to depend on a new java_library target lib, and the picocli plugin is added to the java_binary target. Test dependencies are updated to use :lib instead of :enola.
• Native Image Support: Native image generation is enabled for the demo application in java/dev/enola/cli/demo/BUILD by uncommenting the native_image target and adding the picocli plugin to the demolib target.

Changelog

Click here to see the changelog

• MODULE.bazel
  • Added info.picocli:picocli-codegen:4.7.6 to the list of Maven dependencies.
• java/dev/enola/cli/BUILD
  • Created a java_library target lib for the main application code.
  • Modified the enola java_binary to depend on :lib and use the picocli plugin.
  • Updated test dependencies to use :lib instead of :enola.
• java/dev/enola/cli/demo/BUILD
  • Enabled native image generation for the demo application.
  • Added the picocli plugin to the demolib target.
• maven_install.json
  • Added metadata for the info.picocli:picocli-codegen dependency, including shasums, dependencies, and service providers.
  • Updated hashes for input and resolved artifacts.
• tools/bazel/java_plugin/BUILD
  • Added a java_plugin definition for picocli, specifying the processor class and dependencies.

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The command line, a textual stage,
Where arguments in order engage.
PicoCLI helps us define,
Each option with purpose aligned,
Making interfaces clear and sage.

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[gemini-code-assist]

Code Review

The pull request introduces native support for PicoCLI by adding the picocli-codegen dependency and configuring the Bazel build files to use the PicoCLI Java plugin. This enables the generation of native images using GraalVM. The changes look good overall.

Merge Readiness

The pull request appears to be well-structured and addresses the issue of PicoCLI native support. However, due to the limitations of the review process (specifically, the inability to add review comments), I cannot provide detailed feedback on specific lines of code. Therefore, I recommend that another reviewer with more in-depth knowledge of the codebase and Bazel build system review the changes before merging. I am unable to approve this pull request, and users should have others review and approve this code before merging.