coding-agent/s05_todo_write/code.py

#!/usr/bin/env python3
"""
s05: TodoWrite — 在 s04 Hooks 基础上增加规划工具。

  +---------+      +-------+      +------------------+
  |  User   | ---> |  LLM  | ---> | TOOL_HANDLERS    |
  | prompt  |      |       |      |  bash            |
  +---------+      +---+---+      |  read_file       |
                        ^         |  write_file      |
                        | result  |  edit_file       |
                        +---------+  glob            |
                                      todo_write ← 新增
                                   +------------------+
                                        |
                         内存中的 current_todos
                                        |
                        if rounds_since_todo >= 3:
                          注入 <reminder>

相对 s04 的变化：
  + todo_write 工具 + run_todo_write() 实现
  + 催办提醒（3 轮未更新 todo 后注入提醒）
  + SYSTEM 提示词包含“先规划再执行”的指导
  + agent_loop 中增加 rounds_since_todo 计数器
  循环不变：新工具通过 TOOL_HANDLERS 自动分发。

运行: python s05_todo_write/code.py
需要: pip install anthropic python-dotenv + .env 中配置 ANTHROPIC_API_KEY
"""

import ast, json, os, subprocess
from pathlib import Path

try:
    import readline
    readline.parse_and_bind('set bind-tty-special-chars off')
except ImportError:
    pass

from anthropic import Anthropic
from dotenv import load_dotenv

load_dotenv(override=True)
if os.getenv("ANTHROPIC_BASE_URL"):
    os.environ.pop("ANTHROPIC_AUTH_TOKEN", None)

WORKDIR = Path.cwd()
client = Anthropic(base_url=os.getenv("ANTHROPIC_BASE_URL"))
MODEL = os.environ["MODEL_ID"]
CURRENT_TODOS: list[dict] = []

# s05 变化： SYSTEM 提示词增加规划指导
SYSTEM = (
    f"你是位于 {WORKDIR}. "
    "开始任何多步骤任务前，使用 todo_write 规划步骤。"
    "执行过程中持续更新状态。"
)


# ═══════════════════════════════════════════════════════════
#  来自 s02-s04 （未改动）: 工具实现
# ═══════════════════════════════════════════════════════════

def safe_path(p: str) -> Path:
    path = (WORKDIR / p).resolve()
    if not path.is_relative_to(WORKDIR):
        raise ValueError(f"路径逃逸出工作区：{p}")
    return path

def run_bash(command: str) -> str:
    try:
        r = subprocess.run(command, shell=True, cwd=WORKDIR,
                           capture_output=True, text=True, timeout=120)
        out = (r.stdout + r.stderr).strip()
        return out[:50000] if out else "（无输出）"
    except subprocess.TimeoutExpired:
        return "错误：执行超时（120 秒）"

def run_read(path: str, limit: int | None = None) -> str:
    try:
        lines = safe_path(path).read_text().splitlines()
        if limit and limit < len(lines):
            lines = lines[:limit] + [f"... ({len(lines) - limit} 行更多内容）"]
        return "\n".join(lines)
    except Exception as e:
        return f"错误：{e}"

def run_write(path: str, content: str) -> str:
    try:
        file_path = safe_path(path)
        file_path.parent.mkdir(parents=True, exist_ok=True)
        file_path.write_text(content)
        return f"已写入 {len(content)} 字节到 {path}"
    except Exception as e:
        return f"错误：{e}"

def run_edit(path: str, old_text: str, new_text: str) -> str:
    try:
        file_path = safe_path(path)
        text = file_path.read_text()
        if old_text not in text:
            return f"错误：在文件中未找到目标文本：{path}"
        file_path.write_text(text.replace(old_text, new_text, 1))
        return f"已编辑 {path}"
    except Exception as e:
        return f"错误：{e}"

def run_glob(pattern: str) -> str:
    import glob as g
    try:
        results = []
        for match in g.glob(pattern, root_dir=WORKDIR):
            if (WORKDIR / match).resolve().is_relative_to(WORKDIR):
                results.append(match)
        return "\n".join(results) if results else "（无匹配）"
    except Exception as e:
        return f"错误：{e}"


# ═══════════════════════════════════════════════════════════
#  新增于 s05: todo_write 工具 — 只做规划，不执行
# ═══════════════════════════════════════════════════════════

def _normalize_todos(todos):
    if isinstance(todos, str):
        try:
            个待办 = json.loads(todos)
        except json.JSONDecodeError:
            try:
                个待办 = ast.literal_eval(todos)
            except (SyntaxError, ValueError):
                return None, "错误：todos 必须是列表或 JSON 数组字符串"
    if not isinstance(todos, list):
        return None, "错误：todos 必须是列表"
    for i, t in enumerate(todos):
        if not isinstance(t, dict):
            return None, f"错误：todos[{i}] 必须是对象"
        if "content" not in t or "status" not in t:
            return None, f"错误：todos[{i}] 缺少 'content' 或 'status'"
        if t["status"] not in ("pending", "in_progress", "completed"):
            return None, f"错误：todos[{i}] 包含无效状态 '{t['status']}'"
    return 个待办, None

def run_todo_write(todos: list) -> str:
    global CURRENT_TODOS
    个待办, error = _normalize_todos(todos)
    if error:
        return error
    CURRENT_TODOS = 个待办
    lines = ["\n\033[33m## 当前任务\033[0m"]
    for t in CURRENT_TODOS:
        icon = {"pending": " ", "in_progress": "\033[36m▸\033[0m", "completed": "\033[32m✓\033[0m"}[t["status"]]
        lines.append(f"  [{icon}] {t['content']}")
    print("\n".join(lines))
    return f"已更新 {len(CURRENT_TODOS)} 个任务"

TOOLS = [
    {"name": "bash", "description": "运行一条 shell 命令。",
     "input_schema": {"type": "object", "properties": {"command": {"type": "string"}}, "required": ["command"]}},
    {"name": "read_file", "description": "读取文件内容。",
     "input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "limit": {"type": "integer"}}, "required": ["path"]}},
    {"name": "write_file", "description": "向文件写入内容。",
     "input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "content": {"type": "string"}}, "required": ["path", "content"]}},
    {"name": "edit_file", "description": "在文件中替换一次完全匹配的文本。",
     "input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "old_text": {"type": "string"}, "new_text": {"type": "string"}}, "required": ["path", "old_text", "new_text"]}},
    {"name": "glob", "description": "查找匹配 glob 模式的文件。",
     "input_schema": {"type": "object", "properties": {"pattern": {"type": "string"}}, "required": ["pattern"]}},
    # s05: 新工具
    {"name": "todo_write", "description": "为当前编码会话创建并维护任务清单。",
     "input_schema": {"type": "object", "properties": {"todos": {"type": "array", "items": {"type": "object", "properties": {"content": {"type": "string"}, "status": {"type": "string", "enum": ["pending", "in_progress", "completed"]}}, "required": ["content", "status"]}}}, "required": ["todos"]}},
]

TOOL_HANDLERS = {
    "bash": run_bash, "read_file": run_read, "write_file": run_write,
    "edit_file": run_edit, "glob": run_glob, "todo_write": run_todo_write,
}


# ═══════════════════════════════════════════════════════════
#  来自 s04 （未改动）: Hook 系统
# ═══════════════════════════════════════════════════════════

HOOKS = {"UserPromptSubmit": [], "PreToolUse": [], "PostToolUse": [], "Stop": []}

def register_hook(event: str, callback):
    HOOKS[event].append(callback)

def trigger_hooks(event: str, *args):
    for callback in HOOKS[event]:
        result = callback(*args)
        if result is not None:
            return result
    return None

# s04 保留 Hooks
DENY_LIST = ["rm -rf /", "sudo", "shutdown", "reboot", "mkfs", "dd if="]

def permission_hook(block):
    """PreToolUse: deny list check."""
    if block.name == "bash":
        for p in DENY_LIST:
            if p in block.input.get("command", ""):
                print(f"\n\033[31m⛔ 已拦截：'{p}'\033[0m")
                return "权限被拒绝"
    return None

def log_hook(block):
    """PreToolUse：记录工具调用。"""
    print(f"\033[90m[HOOK] {block.name}\033[0m")
    return None

def context_inject_hook(query: str):
    """UserPromptSubmit: log working directory."""
    print(f"\033[90m[HOOK] UserPromptSubmit: 工作目录：{WORKDIR}\033[0m")
    return None

def summary_hook(messages: list):
    """Stop：打印工具调用次数。"""
    tool_count = sum(1 for m in messages
                     for b in (m.get("content") if isinstance(m.get("content"), list) else [])
                     if isinstance(b, dict) and b.get("type") == "tool_result")
    print(f"\033[90m[HOOK] Stop：会话使用了 {tool_count} 次工具调用\033[0m")
    return None

register_hook("UserPromptSubmit", context_inject_hook)
register_hook("PreToolUse", permission_hook)
register_hook("PreToolUse", log_hook)
register_hook("Stop", summary_hook)


# ═══════════════════════════════════════════════════════════
#  agent_loop — 与以下相同： s04 + 催办提醒 计数器
# ═══════════════════════════════════════════════════════════

def agent_loop(messages: list):
    rounds_since_todo = 0
    while True:
        # s05: 催办提醒 — 如果模型连续 3 轮没有更新待办，则注入提醒
        if rounds_since_todo >= 3 and messages:
            messages.append({"role": "user",
                             "content": "<reminder>请更新你的待办事项。</reminder>"})
            rounds_since_todo = 0

        response = client.messages.create(
            model=MODEL, system=SYSTEM, messages=messages,
            tools=TOOLS, max_tokens=8000,
        )
        messages.append({"role": "assistant", "content": response.content})

        if response.stop_reason != "tool_use":
            force = trigger_hooks("Stop", messages)
            if force:
                messages.append({"role": "user", "content": force})
                continue
            return

        rounds_since_todo += 1
        results = []
        for block in response.content:
            if block.type != "tool_use":
                continue

            blocked = trigger_hooks("PreToolUse", block)
            if blocked:
                results.append({"type": "tool_result", "tool_use_id": block.id,
                                "content": str(blocked)})
                continue

            handler = TOOL_HANDLERS.get(block.name)
            output = handler(**block.input) if handler else f"未知工具：{block.name}"

            trigger_hooks("PostToolUse", block, output)

            # s05: 调用 todo_write 时重置催办计数器
            if block.name == "todo_write":
                rounds_since_todo = 0

            results.append({"type": "tool_result", "tool_use_id": block.id,
                            "content": output})

        messages.append({"role": "user", "content": results})


if __name__ == "__main__":
    print("s05: TodoWrite — 先规划再执行，忘记会提醒")
    print("输入问题后按回车。输入 q 退出。\n")

    history = []
    while True:
        try:
            query = input("\033[36ms05 >> \033[0m")
        except (EOFError, KeyboardInterrupt):
            break
        if query.strip().lower() in ("q", "exit", ""):
            break
        trigger_hooks("UserPromptSubmit", query)
        history.append({"role": "user", "content": query})
        agent_loop(history)
        for block in history[-1]["content"]:
            if getattr(block, "type", None) == "text":
                print(block.text)
        print()