{% if jekyll.environment == "production" %}
  {% if site.google_analytics_key %}
  <script async src="https://www.googletagmanager.com/gtag/js?id={{ site.google_analytics_key }}"></script>
  <script type="text/javascript">

    var _gaq = _gaq || [];
    _gaq.push(['_setAccount', '{{ site.google_analytics_key }}']);
    _gaq.push(['_trackPageview']);

    (function() {
      var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
      ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
      var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
    })();


    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());
    gtag('config', '{{ site.google_analytics_key }}');
  </script>
  {% endif %}
{% else %}
<script>
  function gtag() { console.log('noop'); }
</script>
{% endif %}