googletag_inject.py

from bs4 import BeautifulSoup
import pathlib
import shutil
import streamlit as st

GA_ID = "google_analytics"
GA_SCRIPT = """
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-J39CF4DQL0"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'G-J39CF4DQL0');
</script>
"""

def inject_ga():
    
    index_path = pathlib.Path(st.__file__).parent / "static" / "index.html"
    soup = BeautifulSoup(index_path.read_text(), features="html.parser")
    if not soup.find(id=GA_ID): 
        bck_index = index_path.with_suffix('.bck')
        if bck_index.exists():
            shutil.copy(bck_index, index_path)  
        else:
            shutil.copy(index_path, bck_index)  
        html = str(soup)
        new_html = html.replace('<head>', '<head>\n' + GA_SCRIPT)
        index_path.write_text(new_html)

# inject_ga()