epub converter: update

src/epub_postprocessor.py

@@ -1,5 +1,6 @@
 import codecs
 import json
+from os.path import dirname, normpath, join
 from collections import defaultdict
 from typing import Dict, Union
 
@@ -89,8 +90,12 @@ class EpubPostprocessor:
                 css_href = tag.attrs.get('href')
                 self.html_href2css_href[item.file_name] = css_href
                 if css_href not in self.css_href2content:
-                    print(css_href)
-                    css_content: str = self.ebooklib_book.get_item_with_href(css_href).get_content().decode()
+                    path_to_css_from_html = css_href
+                    html_folder = dirname(item.file_name)
+                    path_to_css_from_root = normpath(join(html_folder, path_to_css_from_html))
+                    css_obj = self.ebooklib_book.get_item_with_href(path_to_css_from_root)
+                    assert css_obj, f'Css style {css_href} was not in manifest.'
+                    css_content: str = css_obj.get_content().decode()
                     self.css_href2content[css_href] = clean_css(css_content)
 
             for i, tag in enumerate(soup.find_all('style')):