Method list_sessions

tutorials/12_session_persistence.py:376–425

列出所有会话（用于 --resume 选择界面）。 对应 Reference: EP09 §8 listSessionsImpl() 使用两阶段策略

(self)

        return session

    def list_sessions(self) -> list[dict]:
        """
        列出所有会话（用于 --resume 选择界面）。

        对应 Reference: EP09 §8
            listSessionsImpl() 使用两阶段策略
        """
        sessions = []
        for filename in os.listdir(self.base_dir):
            if not filename.endswith(".jsonl"):
                continue
            path = os.path.join(self.base_dir, filename)
            session_id = filename[:-6]  # 去掉 .jsonl

            # 快速读取：只读头尾
            # 对应 Reference: EP09 §4
            #   readHeadAndTail(filePath, fileSize, buf)
            #   LITE_READ_BUF_SIZE = 65536 (64KB)
            first_prompt = ""
            last_prompt = ""
            mtime = os.path.getmtime(path)

            with open(path, "r") as f:
                for line in f:
                    line = line.strip()
                    if not line:
                        continue
                    try:
                        entry = json.loads(line)
                    except json.JSONDecodeError:
                        continue
                    if entry.get("type") == "user" and not first_prompt:
                        blocks = entry.get("blocks", [])
                        for b in blocks:
                            if b.get("type") == "text":
                                first_prompt = b["text"][:80]
                                break
                    if entry.get("type") == "last-prompt":
                        last_prompt = entry.get("text", "")[:80]

            sessions.append({
                "session_id": session_id,
                "first_prompt": first_prompt,
                "last_prompt": last_prompt or first_prompt,
                "modified": mtime,
            })

        # 按修改时间降序排列
        sessions.sort(key=lambda s: s["modified"], reverse=True)
        return sessions


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