Fixed image naming being year if no page number was found (#69)

The regex to extract the page number was applied to the complete filepath. If there was a year anywhere in the filepath, it would be extract and seen as the page number. That is fixed now by only looking at the filename instead of the complete filepath.

backend/naming.py

@@ -411,16 +411,20 @@ def preview_mass_rename(volume_id: int, issue_id: int=None, filepath_filter: Lis
 		# If file is image, it's probably a page instead of a whole issue/tpb.
 		# So put it in it's own folder together with the other images.
 		if file['filepath'].endswith(image_extensions):
+			filename: str = basename(file['filepath'])
 			page_number = None
-			page_result = page_regex.search(file['filepath'])
-			if page_result:
-				page_number = next(r for r in page_result.groups() if r is not None)
+			if 'cover' in filename.lower():
+				page_number = 'Cover'
 			else:
-				page_result = None
-				r = page_regex_2.finditer(file['filepath'])
-				for page_result in r: pass
+				page_result = page_regex.search(filename)
 				if page_result:
-					page_number = page_result.group(1)
+					page_number = next(r for r in page_result.groups() if r is not None)
+				else:
+					page_result = None
+					r = page_regex_2.finditer(basename(file['filepath']))
+					for page_result in r: pass
+					if page_result:
+						page_number = page_result.group(1)
 			suggested_name = join(suggested_name, page_number or '1')
 
 		# Add number to filename if other file has the same name