Update README.md
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rich
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urllib3
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prompt_toolkit (optional)
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README.md格式，中英混
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Air2: High-Performance Download Engine
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Air2 是一个基于 Python 开发的高性能多线程下载管理器。它专注于通过超高并发、动态分块策略以及多协议支持（HTTP/HTTPS, SFTP, BitTorrent）来最大化下载速度。该工具提供现代化的交互式命令行界面 (CLI) 和便于脚本自动化的命令行模式。
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Features / 核心功能
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High Concurrency / 超高并发: Optimized thread pool supporting up to 200 concurrent workers to maximize bandwidth usage. (优化的线程池，支持多达 200 个并发工作线程以最大化带宽利用率。)
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Dynamic Chunking / 动态分块: Automatically adjusts chunk sizes based on file size to optimize throughput and reduce overhead. (根据文件大小自动调整分块大小，优化吞吐量并减少开销。)
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Multi-Protocol Support / 多协议支持: Native support for HTTP/HTTPS and SFTP; architecture designed for easy addition of BitTorrent and other protocols. (原生支持 HTTP/HTTPS 和 SFTP；架构设计便于扩展 BitTorrent 及其他协议。)
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Robust Resume Capability / 强大的断点续传: Handles Range requests efficiently to ensure zero data loss during network interruptions. (高效处理 Range 请求，确保网络中断时零数据丢失。)
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Modern CLI Interface / 现代化 CLI 界面: Built with the rich library for real-time progress bars, speed meters, and ETA calculations without clutter. (基于 rich 库构建，提供实时进度条、速度计和预计剩余时间计算，界面简洁。)
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Intelligent Input / 智能输入: Optional integration with prompt_toolkit for command auto-completion, history navigation, and syntax highlighting. (可选集成 prompt_toolkit，支持命令自动补全、历史记录导航和语法高亮。)
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Task Management / 任务管理: Full lifecycle control including add, start, pause, resume, cancel, remove, and automatic ZIP extraction. (完整的全生命周期控制，包括添加、启动、暂停、恢复、取消、移除及自动 ZIP 解压。)
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Speed Limiting / 限速控制: Configurable download speed limits to prevent network congestion. (可配置的下载速度限制，防止网络拥塞。)
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Single File Deployment / 单文件部署: Designed as a single executable script for easy distribution and deployment. (设计为单执行脚本，便于分发和部署。)
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Installation / 安装
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Ensure you have Python 3.8 or higher installed. Install the required dependencies:
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请确保已安装 Python 3.8 或更高版本。安装所需依赖：
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bash
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1
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Note: prompt_toolkit is optional but recommended for enhanced command-line features like auto-completion.
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(注：prompt_toolkit 为可选依赖，但推荐使用以获得自动补全等增强功能。)
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Usage / 使用方法
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Interactive Mode / 交互模式
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Run the script directly to enter the interactive shell:
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直接运行脚本进入交互式 Shell：
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bash
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1
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Available Commands / 可用命令:
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Command
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Description / 描述
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help
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Display command list and help text. / 显示命令列表和帮助信息。
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add <URL> [options]
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Add a new download task. / 添加新的下载任务。
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start <task_id>
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Start a waiting task. / 开始等待中的任务。
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pause <task_id>
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Pause a running task. / 暂停正在运行的任务。
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resume <task_id>
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Resume a paused task. / 恢复暂停的任务。
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cancel <task_id>
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Cancel a task (keeps downloaded files). / 取消任务（保留已下载文件）。
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remove <task_id> [--delete]
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Remove a task and optionally delete the file. / 移除任务并可选择删除文件。
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unzip <task_id> [output_dir]
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Extract completed ZIP files. / 解压已完成的 ZIP 文件。
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list / ls
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Show all tasks and their status. / 显示所有任务及其状态。
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status
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Display system statistics and overall progress. / 显示系统统计数据和总体进度。
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exit / quit
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Close the application. / 关闭应用程序。
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Example / 示例:
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text
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1234
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Command Line Mode / 命令行模式 (Scripting)
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You can also run commands directly from the terminal without entering the interactive shell:
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您也可以直接在终端运行命令，无需进入交互式 Shell：
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bash
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1234567891011
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Options for add Command / add 命令选项
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--threads=N: Number of concurrent threads (default: 8). / 并发线程数（默认：8）。
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--output=DIR: Destination directory (default: current directory). / 目标目录（默认：当前目录）。
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--chunk-size=S: Force specific chunk size (e.g., 10M, 1G). Defaults to dynamic calculation. / 强制指定分块大小（例如 10M, 1G）。默认为动态计算。
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--speed-limit=N: Limit download speed in KB/s (0 for unlimited). / 限制下载速度（KB/s），0 表示不限制。
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--timeout=N: Request timeout in seconds. / 请求超时时间（秒）。
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--retry=N: Number of retry attempts on failure. / 失败后的重试次数。
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Architecture / 架构
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The codebase is structured into distinct modules for maintainability:
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代码库结构清晰，分为独立模块以便于维护：
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DownloadEngine: Manages the core logic, including task queues, thread pools, and state synchronization. (管理核心逻辑，包括任务队列、线程池和状态同步。)
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ChunkDownloader: Handles individual block retrieval, error recovery, and checksum verification. (处理单个块的检索、错误恢复和校验和验证。)
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ProtocolHandler: Abstract base class for different protocols (HTTP, SFTP, etc.), allowing easy extension. (不同协议的抽象基类，便于扩展新协议。)
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ModernCLI: Provides the user interface layer using rich and prompt_toolkit. (使用 rich 和 prompt_toolkit 提供用户界面层。)
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Configuration / 配置
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The engine automatically detects file sizes and adjusts chunk counts. For large files (>1GB), it increases chunk size to 16MB; for medium files (>100MB), it uses 4MB chunks. This dynamic approach minimizes connection overhead while maintaining high parallelism. Users can override these defaults via command-line arguments if specific network conditions require manual tuning.
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引擎会自动检测文件大小并调整分块数量。对于大文件（>1GB），分块大小会增加到 16MB；对于中等文件（>100MB），使用 4MB 分块。这种动态方法在保持高并行度的同时最小化了连接开销。如果特定的网络条件需要手动调整，用户可以通过命令行参数覆盖这些默认值。
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License / 许可
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This project is licensed under the MIT License.
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本项目采用 MIT 许可证授权。
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Requirements / 环境要求
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Python 3.8+
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requests
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rich
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urllib3
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prompt_toolkit (optional)
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