Django template inheritance the other way round - django-templates

Question

Django template system lets you easily specify a template and fill it with different data using extends and blocks.
What I need to do is to have several templates, filled with the same data (blocks) while avoiding code repetition. It sounds like a usecase for templatetags but consider this example:
<div class="container">
{% get_tags page as tags %}
{% if tags %}
<div class="ribbon">
<span class="ribbon-inner">{{ tags|join:' | ' }}</span>
</div>
{% endif %}
</div>
If I wanted to display the tags in another template using a different html elements/classes I would have to create at least two templatetags (has_tags and get_tags) or include html in templatetags code.
I'd like to have something like this:
#common.html
{% block tags %}
{% get_tags page as tags %}
{% if tags %}
<div class="ribbon">
<span class="ribbon-inner">{{ tags|join:' | ' }}</span>
</div>
{% endif %}
{% endblock %}
#template_A.html
{% include common.html %}
<div class="container-1">
{% block tags %}
{{ block.super }}
{% endblock %}
</div>
#template_B.html
{% include common.html %}
{% block tags %}
{% get_tags page as tags %}
{{ tags|join:', ' }}
{% endblock %}
The problem is that include renders the template first, therefore it doesn't work this way. There are a lot of similar points in the file I'm editing, so creating and including template for each of them is not a great solution either.
Any thoughts?

Answer 1

Well, this is my solution:
#templateA.html
{% include "_common.html" with parent_file="_templateA.html" %}
#templateB.html
{% include "_common.html" with parent_file="_templateB.html" %}
#_templateA.html
<i>{% block tags %}{% endblock %}</i>
#_templateB.html
<b>{% block tags %}{{ tags|join:' & ' }}{% endblock %}</b>
#_common.html
{% extends parent_file %}
{% block tags %}
{% if not block.super %} # this does the trick
{{ tags|join:' I ' }}
{% else %}
{{ block.super }}
{% endif %}
{% endblock %}
This allows having HTML templates in _templateA.html and _templateB.html. If the block is left empty, it is filled with default from _common.html, while it can be overriden in _template.
It would be nice to override the block tag to avoid code repetition in _common.html but the following implementation fails on block.super() because of missing context.
#register.tag('overridable_block')
def overridable_block(parser, token):
from django.template.loader_tags import do_block
block = do_block(parser, token)
if block.super():
return block.parent
return block
Haven't found a way past this yet.