From 46684e5376cce41928babd317b192d73ef284df3 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 11 Oct 2020 13:01:32 +0530
Subject: [PATCH] Make the prefixed classes utility function available

---
 src/calibre/web/feeds/news.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/calibre/web/feeds/news.py b/src/calibre/web/feeds/news.py
index 65c79381cb..26f9e20a44 100644
--- a/src/calibre/web/feeds/news.py
+++ b/src/calibre/web/feeds/news.py
@@ -39,6 +39,19 @@ def classes(classes):
         'class': lambda x: x and frozenset(x.split()).intersection(q)})
 
 
+def prefixed_classes(classes):
+    q = frozenset(classes.split(' '))
+
+    def matcher(x):
+        if x:
+            for candidate in frozenset(x.split()):
+                for x in q:
+                    if candidate.startswith(x):
+                        return True
+        return False
+    return {'attrs': {'class': matcher}}
+
+
 class LoginFailed(ValueError):
     pass