Add: function to check if string is html

archivist/sites/furaffinity/templatetags/custom_filters.py

@@ -7,6 +7,23 @@ from bs4 import BeautifulSoup
 
 register = template.Library()
 
+
+def is_html(string):
+    '''
+    Check if string is HTML
+    '''
+    soup = BeautifulSoup(string, "html.parser")
+    # Remove leading and trailing white space
+    stripped_string = string.strip()
+    stripped_soup = str(soup).strip()
+    # If the string remained the same after parsing with BeautifulSoup, it's probably not HTML
+    if stripped_string == stripped_soup:
+        return False
+    # If the string changed when parsed by BeautifulSoup, it's probably HTML
+    else:
+        return True
+
+
 @register.filter
 def is_image(file_url):
     image_extensions = ['.png', '.jpg', '.jpeg', '.gif', '.webp']