Site Atom Generator

The following Ruby code generates the Atom feed of my website. It is composed of three parts:

some global variables used for customizing the Atom feed
an ERB template to generate the feed
Ruby code which collects information about all pages in the notes directory and passes it to the atom template.

Org Mode is told to generate a site.atom file upon execution of this source block. This block is executed when the website is built (or this page exported).

TITLE       = "Adolfo Villafiorita's Homepage"
AUTHOR      = "Adolfo Villafiorita"
DESCRIPTION = "Homepage of Adolfo Villafiorita"
URL         = "https://ict4g.net/adolfo"
EMAIL       = "adolfo.villafiorita@ict4g.net"

ATOM_TEMPLATE = <<EOS
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
  <title><%= TITLE %></title>
  <link href="<%= URL %>/site.atom" rel="self" type="application/rss+xml" />
  <link href="<%= URL %>"/>
  <updated><%= DateTime.now.to_s %></updated>
  <author><name><%= AUTHOR %></name></author>
  <id><%= URL %></id>

  <%- pages.each do |page| -%>
  <entry>
    <title><%= page["TITLE"] %></title>
    <link href="<%= page[:absolute_url] %>"/>
    <id><%= page[:absolute_url] %></id>
    <updated><%= (page["DATE"] ? DateTime.parse(page["DATE"]) : DateTime.now).to_s %></updated>
    <summary>
      <%= page["DESCRIPTION"] || page[:excerpt] || "" %>
    </summary>
  </entry>
  <%- end -%>
</feed>
EOS

require 'erb'
load '_scripts/metadata.rb'

pages = Metadata::collect("notes", url: URL).select { |x| x["CATEGORY"] != "index-page" }
renderer = ERB.new(ATOM_TEMPLATE, nil, "-")
content = renderer.result(binding)
puts content