Generate a separate feed for every tag

content/feeds.njk

@@ -0,0 +1,47 @@
+---
+pagination:
+  data: collections
+  size: 1
+  alias: tag
+  filter:
+    - all
+    - post
+    - posts
+    - tagList
+  addAllPagesToCollections: true
+eleventyComputed:
+  title: “{{ tag }}”
+permalink: "/feeds/{{ tag | slugify }}.xml"
+---
+<?xml version="1.0" encoding="utf-8"?>{% set postslist = collections[ tag ] %}
+<?xml-stylesheet href="../xsl/basic.xsl" type="text/xsl"?>
+<feed xmlns="http://www.w3.org/2005/Atom" xml:base="{{ metadata.language }}">
+	<title>{{ title }} from {{ metadata.title }}</title>
+	<subtitle>{{ tag }}: {{ metadata.description }}</subtitle>
+	<link href="{{ metadata.url }}feeds/{{ tag | slugify }}.xml" rel="self"/>
+	<link href="{{ metadata.url | addPathPrefixToFullUrl }}"/>
+	<updated>{{ postslist | getNewestCollectionItemDate | dateToRfc3339 }}</updated>
+	<id>{{ metadata.url }}</id>
+	<author>
+		<name>{{ metadata.author.name }}</name>
+		<email>{{ metadata.author.email }}</email>
+	</author>
+	{%- for post in postslist | reverse %}
+	{% set absolutePostUrl %}{{ post.url | htmlBaseUrl(metadata.url) }}{% endset %}
+	{% if post.data.imageURL %}{% set imageURL %}{{ post.data.imageURL | htmlBaseUrl(metadata.url) }}{% endset %}{% endif %}
+	{% set defaultImageURL %}{{ metadata.defaultPostImageURL | htmlBaseUrl(metadata.url) }}{% endset %}
+	<entry>
+		<title>{{ post.data.title }}</title>
+		<description>{{ post.data.description | truncate(150) }}</description>
+		<link href="{{ absolutePostUrl }}"/>
+		<updated>{{ post.date | dateToRfc3339 }}</updated>
+		<id>{{ absolutePostUrl }}</id>
+		<image>
+			<url>{% if post.data.imageURL %}{{ imageURL }}{% else %}{{ defaultImageURL }}{% endif %}</url>
+			<title>{% if post.data.imageAlt %}{{ post.data.imageAlt }}{% else %}{{ metadata.defaultPostImageAlt }}{% endif %}</title>
+			<link href="{{ absolutePostUrl }}"/>
+		</image>
+		<content type="html">{{ post.templateContent | transformWithHtmlBase(absolutePostUrl, post.url) }}</content>
+	</entry>
+	{%- endfor %}
+</feed>