You get a feed! You get a feed! Feeds for everyone!

_layouts/feed.xml

@@ -0,0 +1,106 @@
+---
+layout: null
+copyrite: "Copyright © Stack Overflow"
+feedDescription: "free, community powered Q&A"
+feedImage: http://cdn.sstatic.net/stackexchange/img/se-podcast-logo.png
+feedImageName: Stack Overflow
+feedEmail: [email protected]
+teamName: The Stack Overflow Team
+podcastEmail: [email protected]
+podcastTitle: The Stack Overflow Podcast
+podcastSubTitle: A look inside the Stack Exchange Network
+podcastKeywords: "Programming, Stack, Exchange, Stack, Overflow, Computers, Technology, Information, Internet, Question, Answer, Q&A"
+podcastSummary: "Hosted by Joel Spolsky with Jay Hanlon and David Fullerton, the Stack Overflow podcast lets you listen in on discussions and decisions about the Stack Exchange Network. The Stack Overflow podcast gives you an unparalleled view into how a startup is created and built.
+
+
+About Stack Overflow:
+
+Stack Overflow is the flagship property of a fast-growing network of over 100 question and answer sites on diverse topics from software programming to cooking to photography and gaming. We are an expert knowledge exchange: a place where physics researchers can ask each other about quantum entanglement, computer programmers can ask about JavaScript date formats, and photographers can share knowledge about taking great pictures in the snow."
+---
+<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0"
+	xmlns:content="http://purl.org/rss/1.0/modules/content/"
+	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
+	xmlns:dc="http://purl.org/dc/elements/1.1/"
+	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
+	xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd"
+	xmlns:media="http://search.yahoo.com/mrss/"
+>
+<channel>
+	{% if page.tag.name == 'podcasts' %}
+	<title>{{ page.podcastTitle }}</title>
+	<itunes:subtitle>{{ page.podcastSubTitle }}</itunes:subtitle>
+	<itunes:summary>{{ page.podcastSummary }}</itunes:summary>
+	<itunes:keywords>{{ page.podcastKeywords }}</itunes:keywords>
+	<itunes:category text="Technology">
+		<itunes:category text="Software How-To" />
+	</itunes:category>
+	<itunes:category text="Technology">
+		<itunes:category text="Podcasting" />
+	</itunes:category>
+	<itunes:category text="Business" />
+	<itunes:author>{{ page.teamName }}</itunes:author>
+	<itunes:owner>
+		<itunes:name>{{ page.teamName }}</itunes:name>
+		<itunes:email>{{ page.podcastEmail }}</itunes:email>
+	</itunes:owner>
+	<itunes:new-feed-url>{{ site.url }}/feed/podcast</itunes:new-feed-url>
+	<itunes:block>no</itunes:block>
+	<itunes:explicit>no</itunes:explicit>
+	<itunes:image href="{{ page.feedImage }}" />
+	{% else %}
+	{% if !page.tag.name %}
+	<title>{{ site.name }} - {{ page.tag.name | capitalize }}</title>
+	{% else %}
+	<title>{{ site.name }}</title>
+	{% endif %}
+	{% endif %}
+	<atom:link href="{{ site.url }}{{ page.dir }}" rel="self" type="application/rss+xml" />
+	<link>{{ site.url }}</link>
+	<description>{{ page.feedDescription }}</description>
+	<lastBuildDate>{{ site.time | date: "%a, %d %b %Y %T +0000" }}</lastBuildDate>
+	<language>en-US</language>
+		<sy:updatePeriod>hourly</sy:updatePeriod>
+		<sy:updateFrequency>1</sy:updateFrequency>
+	<copyright>{{ page.copyrite }}, {{ site.time | date: "%Y" }}</copyright>
+	<managingEditor>{{ page.feedEmail }} ({{ page.teamName }})</managingEditor>
+	<webMaster>{{ page.feedEmail }} ({{ page.teamName }})</webMaster>
+	<ttl>1440</ttl>
+	<image>
+		<url>{{ page.feedImage }}</url>
+		<title>{{ page.feedImageName }}</title>
+		<link>{{ site.url }}</link>
+		<width>144</width>
+		<height>144</height>
+	</image>
+	{% for post in page.posts %}
+                <item>
+                        <title><![CDATA[{{ post.title | raw }}]]></title>
+                        <link>{{ site.url }}{{ post.url }}</link>
+                        <dc:creator><![CDATA[{{ post.full_author.name }}]]></dc:creator>
+                        {% for category in post.tags %}
+                        <category><![CDATA[{{ category }}]]></category>
+                        {% endfor %}
+                        <pubDate>{{ post.date | date: "%a, %d %b %Y %T +0000" }}</pubDate>
+                        <description><![CDATA[{{ post.excerpt | raw }}]]></description>
+                        <content:encoded><![CDATA[{{ post.content | raw }}]]></content:encoded>
+                        {% if post.podcast %}
+                        {% if post.wordpress_id %}
+                        <guid isPermaLink="false">http://blog.stackoverflow.com/?p={{ post.wordpress_id }}</guid>
+                        {% else %}
+                        <guid isPermaLink="false">{{ site.url }}{{ post.url }}</guid>
+                        {% endif %}
+                        <enclosure type="audio/mpeg" url="{{ post.podcast }}" length="0"/>
+                        {% endif %}
+                        {% if page.tag.name == 'podcasts' %}
+                        <itunes:author>page.teamName</itunes:author>
+                        <itunes:explicit>{% if post.explicit %}yes{% else %}no{% endif %}</itunes:explicit>
+                        <itunes:summary><![CDATA[{{ post.content | strip_html | unescapeHTML | truncate: 4000 }}]]></itunes:summary>
+                        <itunes:subtitle><![CDATA[{{ post.excerpt | strip_html | unescapeHTML | truncate: 255  }}]]></itunes:subtitle>
+                        {% endif %}
+                </item>
+	{% endfor %}
+	</channel>
+</rss>

_plugins/StackGen.rb

@@ -221,6 +221,17 @@ def generate(site)
         All.tags.each do |key, tag|
           paginate_tags(site, '/tags/:tags', [key], 'tag.html', Hash['tag' => tag])
         end
+
+        Jekyll.logger.info "Generating main feed:"        
+        feed_tags(site)
+        Jekyll.logger.info "Generating feed pages for #{All.tags.count} tag(s):"
+        All.tags.each do |key, tag|
+          if key == 'podcasts'
+            feed_tags(site, '/feed/podcast', [key], 'feed.xml', Hash['tag' => tag],0) #Podcast feed has a specific location and no post limit
+          else
+            feed_tags(site, '/feed/:tags', [key], 'feed.xml', Hash['tag' => tag])
+          end
+        end
       end
 
       def paginate_channels(site, category, channels)
@@ -302,6 +313,46 @@ def paginate_inner(site, path, posts, category_tags, layout_source, page_data =
           site.pages << newpage
         end
       end
+
+      # Creates a feed for posts by tags. Renders the <layout_source> or <path>/feed.xml.
+      #
+      # site           - The Site.
+      # path           - The directory to render to.
+      # catgory_tags   - The tag hierarchy to render
+      # laytout_source - The /_layouts/<layoutsource> to use as a template
+      # page_data      - The data to applend to the page object for liquid
+      # limit          - The number of posts to include in the feed
+      #
+      def feed_tags(site, path = '/feed/:tags', category_tags = [], layout_source = 'feed.xml', page_data = nil, limit = 40)
+        path = path.sub(':tags', category_tags.join("/"))
+
+        posts = All.posts
+        for tag in category_tags
+          posts = posts.find_all{|post| post.tags.include?(tag)}
+        end
+        posts = posts.sort_by {|post| -post.date.to_f}
+        if limit > 0
+          posts = posts.first(limit)
+        end
+
+        # Output for the console
+        Jekyll.logger.info("  [#{(category_tags.count == 0 ? "<all>" : category_tags.join(","))}] (#{path}) => #{posts.count} post(s)")
+        # Generate feed
+        newpage = Page.new(site, site.source, layout_source ? site.config['layouts'] : path + "/", layout_source || '/feed/index.xml')
+        unless page_data.nil?
+          page_data.each do |key, value|
+            newpage.data[key] = value
+          end
+        end
+
+        newpage.data['posts'] = posts #Append the post data
+        newpage.dir = path
+        # This may seem irrelevant, but because of how Jekyll::Post generates the path, it's necessary to not have the generated
+        # page in a sub-folder of the source file name. e.g. /company/page3/company/index.html will result from company.html
+        # being used as the layout source
+        newpage.basename = 'index'
+        site.pages << newpage
+      end
     end
   end