Add browser lazy loading

apps/apps.php

@@ -62,3 +62,39 @@ function makeMenu($getDir = null)
     }
     return $menu;
 }
+
+class ExtendParsedownToc extends ParsedownToc
+{
+    public function inlineImage($Excerpt)
+    {
+        if (!isset($Excerpt['text'][1]) or $Excerpt['text'][1] !== '[') {
+            return;
+        }
+
+        $Excerpt['text'] = substr($Excerpt['text'], 1);
+
+        $Link = $this->inlineLink($Excerpt);
+
+        if ($Link === null) {
+            return;
+        }
+
+        $Inline = array(
+            'extent'  => $Link['extent'] + 1,
+            'element' => array(
+                'name'       => 'img',
+                'attributes' => array(
+                    'src'     => $Link['element']['attributes']['href'],
+                    'alt'     => $Link['element']['text'],
+                    'loading' => 'lazy',
+                ),
+            ),
+        );
+
+        $Inline['element']['attributes'] += $Link['element']['attributes'];
+
+        unset($Inline['element']['attributes']['href']);
+
+        return $Inline;
+    }
+}

index.php

@@ -23,12 +23,11 @@ if (empty($file) || !file_exists('content/' . urldecode($dir) . '/' . urldecode(
     }
 }
 
-$Parsedown = new ParsedownToc();
-
 $content = file_get_contents('content/' . urldecode($dir) . '/' . urldecode($file) . '.md');
 $options = array('selectors' => array('h2', 'h3'));
 
-$Parsedown = new ParsedownToc($options);
+$Parsedown = new ExtendParsedownToc($options);
+
 $body = $Parsedown->text($content);
 $toc  = $Parsedown->contentsList();