feat: add stay on page plugin

Author: yanglbme

hooks/stay_on_page.py

@@ -0,0 +1,36 @@
+import re
+
+
+def on_post_page(output, page, config):
+    """
+    <ul class="md-select__list">
+
+          <li class="md-select__item">
+            <a href="/leetcode/en/" hreflang="en" class="md-select__link">
+              English
+            </a>
+          </li>
+
+          <li class="md-select__item">
+            <a href="/leetcode/" hreflang="zh" class="md-select__link">
+              中文
+            </a>
+          </li>
+
+      </ul>
+    """
+    
+    url = page.abs_url
+    cn_url = url.replace("/leetcode/en/", "/leetcode/")
+    en_url = cn_url.replace("/leetcode/", "/leetcode/en/")
+    support_en_lang = not cn_url.startswith("/leetcode/lcof") and not cn_url.startswith(
+        "/leetcode/lcof2"
+    )
+    patterns = {
+        "zh": r'(<a\s+[^>]*href=["\'])[^"\']*(["\'][^>]*hreflang=["\']zh["\'][^>]*>)',
+        "en": r'(<a\s+[^>]*href=["\'])[^"\']*(["\'][^>]*hreflang=["\']en["\'][^>]*>)',
+    }
+    output = re.sub(patterns["zh"], r"\1" + cn_url + r"\2", output)
+    if support_en_lang:
+        output = re.sub(patterns["en"], r"\1" + en_url + r"\2", output)
+    return output

mkdocs.yml

@@ -86,6 +86,7 @@ hooks:
   - hooks/fix_markdown_block.py
   - hooks/ext_info.py
   - hooks/tags.py
+  - hooks/stay_on_page.py
 
 markdown_extensions:
   - admonition