Function main

tutorials/06_system_prompt_builder.py:460–543

()

# ============================================================

def main():
    print("=" * 60)
    print("Tutorial 06: System Prompt Builder 演示")
    print("=" * 60)

    # --- 1. 发现当前项目的 CLAUDE.md ---
    cwd = str(Path(__file__).resolve().parent.parent)  # 项目根目录
    print(f"\n项目根目录: {cwd}")

    ctx = ProjectContext.discover_with_git(cwd, "2026-04-02")
    print(f"发现的指令文件: {len(ctx.instruction_files)} 个")
    for f in ctx.instruction_files:
        print(f"  - {f.path} ({len(f.content)} 字符)")

    if ctx.git_status:
        print(f"\nGit status 快照 (前 200 字符):")
        print(f"  {ctx.git_status[:200]}")

    # --- 2. 用 Builder 构造 system prompt ---
    print("\n--- 构造 System Prompt ---")
    import platform
    prompt = (
        SystemPromptBuilder()
        .with_os(platform.system(), platform.release())
        .with_project_context(ctx)
        .append_section("# Language\nAlways respond in Chinese.")
        .build()
    )

    print(f"总共 {len(prompt)} 个段落:")
    for i, section in enumerate(prompt):
        # 显示每个段落的前 60 个字符
        preview = section.replace('\n', ' ')[:60]
        is_boundary = section == DYNAMIC_BOUNDARY
        marker = " ═══ 分界线 ═══" if is_boundary else ""
        print(f"  [{i}] {preview}...{marker}")

    # --- 3. 看看完整的 prompt 有多长 ---
    full_prompt = "\n\n".join(prompt)
    print(f"\n完整 prompt 长度: {len(full_prompt)} 字符")
    print(f"估算 token 数: ~{len(full_prompt) // 4} tokens")

    # --- 4. 看看 CLAUDE.md 怎么被注入的 ---
    print("\n--- CLAUDE.md 注入位置 ---")
    for i, section in enumerate(prompt):
        if "Claude instructions" in section:
            print(f"  在第 [{i}] 段落中找到 Claude instructions:")
            print(f"  {section[:200]}...")
            break

    # 解说
    print("\n" + "=" * 60)
    print("关键理解要点：")
    print("=" * 60)
    print("""
    1. System Prompt 是分层构建的：
       固定层（角色/规则/安全） + 动态层（环境/项目/CLAUDE.md/配置）
       中间有一条 DYNAMIC_BOUNDARY 分界线