Sitemap (sitemaps.org) generator for Middleman

sitemap.xml.erb

<% pages = sitemap.resources.find_all{|p| p.source_file.match(/\.html/) } %>
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<% pages.each do |p| %>
  <url>
    <loc>http://youdomain.com/<%=p.destination_path.gsub('/index.html','')%></loc>
    <priority>0.7</priority>
  </url>
<% end %>
</urlset>

Incase of directory_indexes using url instead of destination_path does the trick

<loc>http://youdomain.com<%=p.url.gsub('/index.html','')%></loc>

I tweaked this gist to the following code for sitemap.xml.erb it works with directory indexes and has ability to hide pages from sitemap and set priorities for each page from frontmatter, priority defaults to 0.5

---
layout: false
directory_index: false

---
<% pages = sitemap.resources.find_all{|p| p.source_file.match(/\.html/) && !p.data.sitemap_noindex == true } %>
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<% pages.each do |p| %>
  <url>
    <loc>http://balcozy.com<%=p.url.gsub('/index.html','')%></loc>
    <changefreq>monthly</changefreq>
    <priority><%= p.data.sitemap_priority || 0.5 %></priority>
  </url>
<% end %>
</urlset>

In page.html.erb use sitemap_noindex: true and sitemap_priority: whenever needed

---
sitemap_noindex: true
sitemap_priority: 0.8

---

For anyone coming across this recently, I had to modify the suggestion above to work with redirects. My sitemap.xml.erb file looks like this:

---
layout: false
directory_index: false
---
<% pages = sitemap.resources.reject{|r| r.is_a? Middleman::Sitemap::Extensions::RedirectResource }.find_all{|p| p.source_file.match(/\.html/) && !p.data.sitemap_noindex == true } %>
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<% pages.each do |p| %>
  <url>
    <loc>https://example.com<%=p.url.gsub('/index.html','')%></loc>
    <changefreq>monthly</changefreq>
    <priority><%= p.data.sitemap_priority || 0.5 %></priority>
  </url>
<% end %>
</urlset>