import os
import pickle
from langchain_community.document_loaders.sitemap import SitemapLoader

def save_documents_to_disk(docs, file_path):
    """Save the documents to a file using pickle."""
    with open(file_path, 'wb') as file:
        pickle.dump(docs, file)

def load_documents_from_disk(file_path):
    """Load the documents from a file if it exists."""
    if os.path.exists(file_path):
        with open(file_path, 'rb') as file:
            return pickle.load(file)
    return None

def load_documents_from_sitemap(sitemap_url):
    """Load documents from a sitemap URL using SitemapLoader."""
    sitemap_loader = SitemapLoader(web_path=sitemap_url)
    return sitemap_loader.load()