Add img tag lazy loading

1 files changed, 11 insertions, 5 deletions

diff --git a/cgit/filters/html-transform.py b/cgit/filters/html-transform.py
index e12ffda..51b3538 100755
--- a/cgit/filters/html-transform.py
+++ b/cgit/filters/html-transform.py
@@ -41,12 +41,18 @@ class LinkRewriter(HTMLParser):
         else:
           value = "../" + urljoin("plain/", value)
       attr_map[name] = value
-      # Open in new tab
-      if tag == "a" and name == "href" and is_absolute_url(value):
-        if not 'target' in attr_map: attr_map['target'] = '_blank _parent'
-        if not 'rel' in attr_map: attr_map['rel'] = 'noopener'
 
-    attr_str = "".join(
+    # Open in new tab
+    if tag == 'a' and 'href' in attr_map and is_absolute_url(attr_map['href']):
+      if not 'target' in attr_map: attr_map['target'] = '_blank _parent'
+      if not 'rel' in attr_map: attr_map['rel'] = 'noopener'
+
+    # Image tag lazy loading
+    if tag == 'img':
+      attr_map['loading'] = 'lazy'
+      attr_map['decoding'] = 'async'
+
+    attr_str = ''.join(
       f' {name}="{html.escape(value, quote=True)}"' if value is not None else f" {name}"
       for name, value in attr_map.items()
     )