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fix(export): add EpubNav and debug logging for EPUB export (#143) #172

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fix(export): add EpubNav and debug logging for EPUB export (#143) #172

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9 changes: 8 additions & 1 deletion application/core/services/export_service.py
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,11 @@ def export_novel(self, novel_id: str, format: str) -> Tuple[bytes, str, str]:
chapters = self.chapter_repository.list_by_novel(NovelId(novel_id))
chapters.sort(key=lambda x: x.number)
logger.info("导出: %s, 章节数 %s", novel.title, len(chapters))
# ★ 修复 #143：记录每章内容长度，便于排查导出内容为空的问题
for ch_debug in chapters:
ch_len = len(ch_debug.content or "")
if ch_len == 0:
logger.warning("导出警告: 章节 %d (%s) 内容为空", ch_debug.number, ch_debug.title or "无标题")
if format == "epub":
result = self._export_to_epub(novel, chapters)
elif format == "pdf":
Expand Down Expand Up @@ -192,7 +197,9 @@ def _export_to_epub(self, novel: Novel, chapters: list[Chapter]) -> Tuple[bytes,

book.toc = tuple([intro] + spine_items[1:])
book.add_item(epub.EpubNcx())
# 不使用空 EpubNav（ebooklib 生成 nav 时会解析正文，空文档会触发 lxml Document is empty）
# ★ 修复 #143：添加 EpubNav 导航文档（EPUB 3 标准要求）
# 缺失 nav 文档会导致部分阅读器只显示目录而无法加载正文内容
book.add_item(epub.EpubNav())
book.spine = spine_items

tmp_path: Optional[str] = None
Expand Down