support analytics

app.py

@@ -27,6 +27,8 @@ def find_key(token):
     "script-src": [
         "'self'",
         "*.cloudflare.com",
+        "*.googletagmanager.com",
+        "*.google-analytics.com",
         "'unsafe-inline'",
         "'unsafe-eval'",
     ],

docs/_templates/layout.html

@@ -1,2 +1,15 @@
 {% extends "!layout.html" %}
+{%- block extrahead %}
+{%- if tracking_id %}
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id={{ tracking_id }}"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', '{{ tracking_id }}');
+</script>
+{% endif -%}
+{% endblock %}
 {% set css_files = css_files + [ "_static/style.css" ] %}

docs/conf.py

@@ -132,6 +132,7 @@
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
 html_title = "pysheeet"
+html_context = {"tracking_id": os.environ.get("TRACKING_ID")}
 
 # A shorter title for the navigation bar.  Default is the same as html_title.
 #html_short_title = None