code: def create_page(pagename):
      
      page = pagename.lstrip("/").rstrip("/")
      _, _ext = os.path.splitext(pagename)
  
      # If the file doesn't have an extension, we'll just create one
      if not _ext or _ext == "":
          page += ".jade"
  
      if not page.endswith(PAGE_FORMAT):
          error("Can't create '%s'" % page)
          print("Invalid filename format")
          print("Filename must be in: '%s'" % " | ".join(PAGE_FORMAT))
      else:
          engine = Yass(CWD)
          markup = "jade"
          if page.endswith(".md"):
              markup = "md"
          if page.endswith(".html"):
              markup = "html"
  
          dest_file = os.path.join(engine.pages_dir, page)
          dest_dir = os.path.dirname(dest_file)
  
          content = TPL_HEADER
          content += TPL_BODY[markup]
  
          if os.path.isfile(dest_file):
              error("File exists already")
              print("Location: %s" % dest_file)
  
          else:
              if not os.path.isdir(dest_dir):
                  os.makedirs(dest_dir)
              with open(dest_file, "w") as f:
                  f.write(content)
  
              print("New page created: '%s'" % page)
              print("Location: %s" % dest_file)
  
  
      footer()
docs: Create a new page Omit the extension, it will create it as .jade file