Merge push-nqrvnzxzrpkz Into main

[dclong]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces automated generation of pull request titles and descriptions. It adds a compare method to the Repository class, a new pr_content module featuring both deterministic and LiteLLM-based AI generation layers, and CLI options to trigger this generation when creating a pull request. The review feedback suggests several key improvements: enhancing breaking change detection to support both 'BREAKING CHANGE' and 'BREAKING-CHANGE' formats, making the LLM JSON parsing more robust against markdown code block wrapping, and optimizing API calls in the CLI script by fetching open pull requests once and exiting early if the PR already exists.

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[gemini-code-assist]

Instead of calling _pull_request_exists (which fetches all open PRs) and then calling repo.create_pull_request (which fetches all open PRs again), we can fetch the open PRs once in main. If the PR already exists, we can print a message and exit early with 0. This avoids redundant paginated API calls and saves time/rate limits.

    # Check if the pull request already exists to avoid redundant description generation and API calls.
    prs = repo.get_pull_requests()
    existing_pr = next(
        (
            pr
            for pr in prs
            if pr["head"]["ref"] == args.head_branch
            and pr["base"]["ref"] == args.base_branch
        ),
        None,
    )
    if existing_pr is not None:
        print(
            f"Pull request already exists: {existing_pr.get('html_url')}",
            file=sys.stderr,
        )
        return 0

    pull_request = {
        "base": args.base_branch,
        "head": args.head_branch,
        "title": f"Merge {args.head_branch} Into {args.base_branch}",
    }
    if args.generate_description:
        content = generate_content(repo, args.head_branch, args.base_branch, args.model)
        if content is not None:
            pull_request["title"], pull_request["body"] = content
    repo.create_pull_request(pull_request)
    return 0

[gemini-code-assist]

Since we are removing the _pull_request_exists helper function in favor of an early exit in main, we should remove this unused test to keep the test suite clean and passing.