add atom (rss) feed

boneskull · boneskull · commit 1b82cefaf376 · 2016-11-20T00:56:57.000-08:00
- add meta tag to blog for discoverability of feed
- add custom plugin to fix relative urls in post content
diff --git a/_includes/header.html b/_includes/header.html
@@ -25,6 +25,7 @@
 	<meta property="og:title" content="{{ page.title | xml_escape }}" />
 	<meta property="og:description" content="Find out more on the blog" />
 	<meta property="og:image" content="https://nodered.org/node-red-icon.png" />
+	<link type="application/atom+xml" rel="alternate" href="{{ site.url }}/feed.xml" />
 	{% endif %}
 </head>
 <body>
diff --git a/_plugins/relative-urls-to-absolute.rb b/_plugins/relative-urls-to-absolute.rb
@@ -0,0 +1,14 @@
+ module Jekyll
+  module RSSURLFilter
+    def relative_urls_to_absolute(input)
+      url = @context.registers[:site].config['url']
+      input
+        .gsub('src="/', 'src="' + url + '/')
+        .gsub('href="/', 'href="' + url + '/')
+        .gsub('src=&quot;/', 'src=&quot;' + url + '/')
+        .gsub('href=&quot;/', 'href=&quot;' + url + '/')
+    end
+  end
+end
+
+Liquid::Template.register_filter(Jekyll::RSSURLFilter)
diff --git a/feed.xml b/feed.xml
@@ -0,0 +1,75 @@
+---
+---
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+  <generator uri="http://jekyllrb.com" version="{{ jekyll.version }}">Jekyll</generator>
+  <link href="{{ page.url | absolute_url }}" rel="self" type="application/atom+xml" />
+  <link href="{{ '/' | absolute_url }}" rel="alternate" type="text/html" />
+  <updated>{{ site.time | date_to_xmlschema }}</updated>
+  <id>{{ '/' | absolute_url | xml_escape }}/</id>
+
+  {% if site.title %}
+    <title type="html">{{ site.title | xml_escape }}</title>
+  {% elsif site.name %}
+    <title type="html">{{ site.name | xml_escape }}</title>
+  {% endif %}
+
+  {% if site.description %}
+    <subtitle>{{ site.description | xml_escape }}</subtitle>
+  {% endif %}
+
+  {% if site.author %}
+    <author>
+        <name>{{ site.author.name | default: site.author | xml_escape }}</name>
+      {% if site.author.email %}
+        <email>{{ site.author.email | xml_escape }}</email>
+      {% endif %}
+      {% if site.author.uri %}
+        <uri>{{ site.author.uri | xml_escape }}</uri>
+      {% endif %}
+    </author>
+  {% endif %}
+
+  {% for post in site.posts limit: 10 %}
+  {% unless post.draft %}
+    <entry>
+      <title type="html">{{ post.title | strip_html | normalize_whitespace | xml_escape }}</title>
+      <link href="{{ post.url | absolute_url }}" rel="alternate" type="text/html" title="{{ post.title | xml_escape }}" />
+      <published>{{ post.date | date_to_xmlschema }}</published>
+      <updated>{{ post.last_modified_at | default: post.date | date_to_xmlschema }}</updated>
+      <id>{{ post.id | absolute_url | xml_escape }}</id>
+      <content type="html" xml:base="{{ site.url }}">{{ post.content | relative_urls_to_absolute | strip | xml_escape }}</content>
+
+      {% assign post_author = post.author | default: post.authors[0] | default: site.author %}
+      {% assign post_author = site.data.authors[post_author] | default: post_author %}
+      {% assign post_author_email = post_author.email | default: nil %}
+      {% assign post_author_uri = post_author.uri | default: nil %}
+      {% assign post_author_name = post_author.name | default: post_author %}
+
+      {% if post_author %}
+        <author>
+            <name>{{ post_author_name | xml_escape }}</name>
+          {% if post_author_email %}
+            <email>{{ post_author_email | xml_escape }}</email>
+          {% endif %}
+          {% if post_author_uri %}
+            <uri>{{ post_author_uri | xml_escape }}</uri>
+          {% endif %}
+        </author>
+      {% endif %}
+
+      {% if post.category %}
+        <category term="{{ post.category | xml_escape }}" />
+      {% endif %}
+
+      {% for tag in post.tags %}
+        <category term="{{ tag | xml_escape }}" />
+      {% endfor %}
+
+      {% if post.excerpt and post.excerpt != empty %}
+        <summary type="html">{{ post.excerpt | strip_html | normalize_whitespace | xml_escape }}</summary>
+      {% endif %}
+    </entry>
+  {% endunless %}
+  {% endfor %}
+</feed>
