SpaceXAI 合并后人才加速流失：50+ 人离职，Meta 成最大接收方

"""
team_health.py — 从 GitHub 组织仓库提取贡献者活跃度趋势
依赖: pip install PyGithub
运行: python team_health.py --org YOUR_ORG --token YOUR_GITHUB_TOKEN --weeks 12
"""

import argparse
from datetime import datetime, timedelta
from collections import defaultdict
from github import Github


def fetch_weekly_commits(org_name: str, token: str, weeks: int = 12):
    """按周统计每个贡献者的 commit 数量"""
    g = Github(token)
    org = g.get_organization(org_name)
    cutoff = datetime.now() - timedelta(weeks=weeks)

    # 按周编号(0=最近一周, weeks-1=最远一周)统计每人 commit 数
    contributor_weekly = defaultdict(lambda: defaultdict(int))

    for repo in org.get_repos():
        for commit in repo.get_commits(since=cutoff):
            author = commit.author
            if author is None:
                continue
            login = author.login
            # 计算该 commit 属于哪一周(倒序编号)
            week_index = (weeks - 1) - (
                (commit.commit.author.date - cutoff).days // 7
            )
            week_index = max(0, min(week_index, weeks - 1))
            contributor_weekly[login][week_index] += 1

    return contributor_weekly, weeks


def detect_decline(contributor_weekly: dict, weeks: int, threshold: float = 0.4):
    """检测活跃度连续下降的贡献者
    threshold: 最近4周均值 < 前4周均值的 threshold 倍时标记为下降
    """
    alerts = []
    for login, weekly in contributor_weekly.items():
        # week_index 0 = 最近一周
        recent = sum(weekly.get(i, 0) for i in range(4))
        earlier = sum(weekly.get(i, 0) for i in range(4, 8))
        if earlier > 0 and recent < earlier * threshold:
            alerts.append({
                "login": login,
                "recent_4w": recent,
                "earlier_4w": earlier,
                "ratio": round(recent / earlier, 2) if earlier else 0,
            })
    return sorted(alerts, key=lambda x: x["ratio"])


def main():
    parser = argparse.ArgumentParser(description="GitHub 组织团队活跃度诊断")
    parser.add_argument("--org", required=True, help="GitHub 组织名")
    parser.add_argument("--token", required=True, help="GitHub Personal Access Token")
    parser.add_argument("--weeks", type=int, default=12, help="回看周数")
    parser.add_argument("--threshold", type=float, default=0.4, help="下降判定阈值")
    args = parser.parse_args()

    data, weeks = fetch_weekly_commits(args.org, args.token, args.weeks)
    alerts = detect_decline(data, weeks, args.threshold)

    print(f"=== {args.org} 团队活跃度诊断 (近 {weeks} 周) ===")
    print(f"总贡献者: {len(data)} 人")
    print(f"活跃度下降预警: {len(alerts)} 人\n")

    for a in alerts:
        print(
            f"⚠ {a['login']}  近4周 {a['recent_4w']} commits "
            f"| 前4周 {a['earlier_4w']} commits | 比值 {a['ratio']}"
        )

    if not alerts:
        print("✅ 未检测到明显活跃度下降趋势")


if __name__ == "__main__":
    main()

=== my-ai-team 团队活跃度诊断 (近 12 周) ===
总贡献者: 28 人
活跃度下降预警: 3 人

⚠ alice  近4周 2 commits | 前4周 18 commits | 比值 0.11
⚠ bob    近4周 1 commits | 前4周 8 commits  | 比值 0.12
⚠ carol  近4周 3 commits | 前4周 12 commits | 比值 0.25