{% assign theCol = site.collections | where: "label", page.collection | first %}
{% assign filename = page.slug  | append: '.md' %}
<a "target="_blank" href="https://github.com/{{theCol.basepath}}/{{filename}}{% unless page.url contains "index.html" %}{% endunless %}" class="btn btn-default githubEditButton" role="button">
  <span data-uk-icon="icon: pencil; ratio: 1.2"></span> Edit this page on Github</a>