{% assign breadcrumb_page = nil %}
{% for page in site.pages %}
  {% if page.url == include.url %}
    {% assign breadcrumb_page = page %}
    {% break %}
  {% endif %}
{% endfor %}

{% assign breadcrumb_text = breadcrumb_page.breadcrumb_text | default: breadcrumb_page.title | default: include.default %}

{% unless breadcrumb_page == nil %}
  <a href="https://gist.github.com/%7B%7B%20breadcrumb_page.url%20|%20relative_url%20%7D%7D">{{ breadcrumb_text }}</a>
{% else %}
  {{ breadcrumb_text }}
{% endunless %}
>