How to insert current URL into an article/page in Pelican

I'm trying to craft a unique Tweet button for each article/web page, using this HTML snippet found in most themes' twitter.html template file:

<!-- language: raw -->
<script
    charset="utf-8"
    src="http://platform.twitter.com/widgets.js"
    type="text/javascript"
>
</script>

<a class="fab fa-twitter"
   target="_blank"
   href="https://twitter.com/intent/tweet?ref_src=twsrc%5Etfw&text=Hi!%20I%20think%20that%20...&tw_p=tweetbutton&url={{ article }}&via={{ TWITTER_USERNAME }}"> 
</a>

My problem is that pelican output processor translate the {{ article }} internal variable name gets into its full OS-filepath specification of a particular article and not my desired URL setting.

I would like to used something like:

{{ SITEURL }}/{{ slug }}.

But pelican computes that as an empty string.

Caveat: I do have RELATIVE_URL = True in my pelicanconfig.py configuration setting file.

What internal variable names (or environment name) can one used to get the full URL setting (i.e., https://example.org/articles/first-post.html)?

Solution

The only fix I can do is to duplicate the SITEURL as in:

SITEURL = 'https://example.com/'
ABSOLUTE_SITEURL = SITEURL

And in its place where SITEURL is, use the untouched ABSOLUTE_SITEURL in the template files whether it is in RELATIVE_URLS mode or not.