Add filter for getting category from all

pelicanconf.py

@@ -82,6 +82,7 @@ SITEMAP = {
 import filters
 JINJA_FILTERS = {
     "datetime": filters.format_datetime,
-    "raw": filters.html_to_raw
+    "raw": filters.html_to_raw,
+    "category_find": filters.category_find
 }
 # Extra context

plugins/filters.py

@@ -11,3 +11,10 @@ def html_to_raw(html):
     for script in soup(["script", "style"]):  # Remove script / style tags
         script.extract()
     return soup.get_text()
+
+
+def category_find(categories, name):
+    for category_name, articles in categories:
+        if category_name == name:
+            return articles
+    return []