sitemap.xml

---
# Custom sitemap that extends jekyll-sitemap's template so every page gets a
# <lastmod>. Posts use their date (or last_modified_at); pages fall back to the
# site build time. jekyll-sitemap defers to this file since it already exists.
---
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  {% assign collections = site.collections | where_exp:'collection','collection.output != false' %}
  {% for collection in collections %}
    {% assign docs = collection.docs | where_exp:'doc','doc.sitemap != false' %}
    {% for doc in docs %}
      <url>
        <loc>{{ doc.url | replace:'/index.html','/' | absolute_url | xml_escape }}</loc>
        <lastmod>{{ doc.last_modified_at | default: doc.date | default: site.time | date_to_xmlschema }}</lastmod>
      </url>
    {% endfor %}
  {% endfor %}

  {% assign pages = site.html_pages | where_exp:'doc','doc.sitemap != false' | where_exp:'doc','doc.url != "/404.html"' %}
  {% for page in pages %}
    <url>
      <loc>{{ page.url | replace:'/index.html','/' | absolute_url | xml_escape }}</loc>
      <lastmod>{{ page.last_modified_at | default: site.time | date_to_xmlschema }}</lastmod>
    </url>
  {% endfor %}

  {% assign static_files = site.static_files | where_exp:'file','file.sitemap == true' %}
  {% for file in static_files %}
    <url>
      <loc>{{ file.path | replace:'/index.html','/' | absolute_url | xml_escape }}</loc>
      <lastmod>{{ file.modified_time | date_to_xmlschema }}</lastmod>
    </url>
  {% endfor %}
</urlset>