fix(codex): 完善独立运行与文档转换兼容性

plugins/doc/skills/md-to-docx/scripts/convert.py

@@ -9,10 +9,6 @@ import sys
 from dataclasses import dataclass, field
 from pathlib import Path
 
-from docx import Document
-from docx.shared import Inches, Pt
-
-
 @dataclass
 class Result:
     """记录生成物与转换统计。"""
@@ -43,6 +39,10 @@ class Converter:
     """使用可预测的小型解析器转换常见 Markdown。"""
 
     def __init__(self, source: Path, output: Path, template: Path | None) -> None:
+        # 第三方库在真正转换时才加载，使 --help、参数错误和能力探测不依赖本机预装包。
+        from docx import Document
+
+        self.document_type = Document
         self.source = source
         self.doc = Document(template) if template else Document()
         self.result = Result(output)
@@ -61,12 +61,14 @@ class Converter:
                 self.add_line(lines[index])
                 index += 1
         self.doc.save(self.result.output)
-        Document(self.result.output)
+        self.document_type(self.result.output)
         return self.result
 
     def add_code(self, lines: list[str], start: int) -> int:
         """读取围栏代码块；未闭合时输出其余内容并记录警告。"""
 
+        from docx.shared import Pt
+
         index = start + 1
         content: list[str] = []
         while index < len(lines) and not lines[index].lstrip().startswith("```"):
@@ -101,6 +103,8 @@ class Converter:
     def add_line(self, line: str) -> None:
         """识别标题、列表、引用、分隔线和普通段落。"""
 
+        from docx.shared import Inches
+
         value = line.strip()
         if not value:
             return
@@ -158,6 +162,8 @@ class Converter:
     def add_image(self, paragraph, alt: str, target: str) -> None:
         """只处理本地图片，防止转换过程产生隐式网络访问。"""
 
+        from docx.shared import Inches
+
         if re.match(r"^[a-z][a-z0-9+.-]*://", target, re.I):
             paragraph.add_run(f"[远程图片：{alt or target}]")
             self.result.warnings.append(f"未下载远程图片：{target}")
@@ -193,9 +199,22 @@ def main(argv: list[str] | None = None) -> int:
         print("错误：输出必须是可写的 .docx；覆盖需使用 --force", file=sys.stderr); return 1
     if template and (not template.is_file() or template.suffix.lower() != ".docx"):
         print("错误：模板必须是存在的 .docx 文件", file=sys.stderr); return 2
+    try:
+        converter = Converter(source, output, template)
+    except ModuleNotFoundError as error:
+        if error.name == "docx":
+            print(
+                "错误：缺少 python-docx。请使用 Codex 工作区依赖运行时，"
+                "或在已获授权的本地 Python 环境中安装 python-docx 后重试。",
+                file=sys.stderr,
+            )
+            return 3
+        raise
+    except (OSError, ValueError) as error:
+        print(f"错误：{error}", file=sys.stderr); return 1
     output.parent.mkdir(parents=True, exist_ok=True)
     try:
-        result = Converter(source, output, template).convert()
+        result = converter.convert()
     except (OSError, ValueError) as error:
         print(f"错误：{error}", file=sys.stderr); return 1
     print(f"DOCX：{result.output}")