Is there a way to check if a path is absolute in jinja2?

Question

In the pydata-sphinx-theme we need to check if a path is absolute or not before adding it to the template. Currently we use the following:

{% set image_light = image_light if image_light.startswith("http") else pathto('_static/' + image_light, 1) %}

It's working but fails to capture local files and many other absolute configurations. Is there a more elegant way to perform this check ?

Answer 1

thanks @klas Š.for the guidances.

for anyone coming here I did add:

from urllib.parse import urlparse

# The registration function
def setup_is_absolute(app, pagename, templatename, context, doctree):
    def is_absolute(link):
        return bool(urlparse(link).netloc) or link.startswith("/")
    context['is_absolute'] = is_absolute


 # Your extension's setup function
 def setup(app):
     app.connect("html-page-context", setup_is_absolute)

and in my template:

{{ is_absolute(logo) }}