Function read_git_diff

tutorials/06_system_prompt_builder.py:205–231

读取 git diff 快照（暂存和未暂存的修改）

(cwd: str)

def read_git_diff(cwd: str) -> Optional[str]:
    """读取 git diff 快照（暂存和未暂存的修改）"""
    sections = []

    # 暂存的修改（git add 过的）
    try:
        staged = subprocess.run(
            ["git", "diff", "--cached"],
            cwd=cwd, capture_output=True, text=True, timeout=5,
        )
        if staged.returncode == 0 and staged.stdout.strip():
            sections.append(f"Staged changes:\n{staged.stdout.strip()}")
    except (subprocess.TimeoutExpired, FileNotFoundError):
        pass

    # 未暂存的修改
    try:
        unstaged = subprocess.run(
            ["git", "diff"],
            cwd=cwd, capture_output=True, text=True, timeout=5,
        )
        if unstaged.returncode == 0 and unstaged.stdout.strip():
            sections.append(f"Unstaged changes:\n{unstaged.stdout.strip()}")
    except (subprocess.TimeoutExpired, FileNotFoundError):
        pass

    return "\n\n".join(sections) if sections else None


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