Update

export.py

@@ -55,6 +55,10 @@ def export_chapter(ncw: NovelCiwei, db: CwmDb, cfg: Config, bn: BooksNew,
 def export_book(ncw: NovelCiwei, db: CwmDb, cfg: Config, bn: BooksNew,
                 book_id: int):
     book = ncw.get_book_in_shelf(book_id)
+    if book is None:
+        book = ncw.get_book_in_readhistory(book_id)
+    if book is None:
+        raise ValueError('The book is not found.')
     if cfg.export_txt:
         txt_filename = cfg.get_export_book(book, 'txt')
         d = dirname(txt_filename)

novelCiwei.py

@@ -13,6 +13,13 @@ class NovelCiwei:
         for i in cur:
             return json.loads(i[0])
 
+    def get_book_in_readhistory(self, book_id: int):
+        cur = self._db.execute(
+            'SELECT book_info FROM read_history WHERE book_id = ?;',
+            [str(book_id)])
+        for i in cur:
+            return json.loads(i[0])
+
     def get_books(self):
         cur = self._db.execute('SELECT * FROM shelf_book_info;')
         cur.row_factory = sqlite3.Row