Initial commit

_config.yml

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+twitter_format: "@title: @url@tags"
+twitter_url_length: 22
+twitter_max_length: 140

_layouts/social-feed.xml

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+---
+layout: social-feed
+---
+<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+  <channel>
+    <title>{{ site.blog_title | xml_escape }}</title>
+    <description>{{ site.blog_description | xml_escape }}</description>
+    <link>{{ site.site_url }}{{ site.blog_url }}</link>
+    <atom:link href="{{ "/feed.xml" | prepend: site.blog_url | prepend: site.site_url }}" rel="self" type="application/rss+xml" />
+    <pubDate>{{ site.time | date_to_rfc822 }}</pubDate>
+    <lastBuildDate>{{ site.time | date_to_rfc822 }}</lastBuildDate>
+    <generator>Jekyll v{{ jekyll.version }}</generator>
+    {% assign site.twitter_format = "@title: @url@tags" %}
+    {% assign site.site.twitter_url_length = 22 %}
+    {% assign twitter_max_length = 140 %}
+
+    {% assign platform = page.title | downcase %}
+
+    {% for post in site.posts limit:10 %}
+        {% assign share_on = post.share | downcase %}
+
+        {% if share_on contains '--twitter-hashtags' %}
+            {% assign format_parsed = site.twitter_format | replace: '@title', post.title | replace: '@url', '' | replace: '@tags', '' | size %}
+            {% assign post_tags = '' %}
+            {% assign space_left = site.twitter_max_length | minus: format_parsed.size %}
+
+            {% if site.twitter_format contains '@url' %}
+                {% assign space_left = space_left | minus: site.twitter_url_length %}
+            {% endif %}
+
+            {% for tag in post.tags %}
+                {% capture new_tag %} #{{ tag }}{% endcapture %}
+                {% assign new_space_left = space_left | minus: new_tag.size %}
+
+                {% if new_space_left > 0 %}
+                    {% assign post_tags = post_tags | append: new_tag %}
+                    {% assign space_left = space_left | minus: new_tag.size %}
+                {% endif %}
+            {% endfor %}
+
+            {% assign post_title = site.twitter_format | replace: '@title', post.title | replace: '@tags', post_tags | replace: '@url', post.url %}
+        {% else %}
+            {% assign post_title = post.title %}
+        {% endif %}
+
+        {% if share_on contains platform %}
+        <item>
+            <title>{{ post_title | xml_escape }}</title>
+            <description>{{ post.content | xml_escape }}</description>
+            <pubDate>{{ post.date | date_to_rfc822 }}</pubDate>
+            <link>{{ post.url | prepend: site.site_url }}</link>
+            <guid isPermaLink="true">{{ post.url | prepend: site.site_url }}</guid>
+            {% for tag in post.tags %}
+            <category>{{ tag | xml_escape }}</category>
+            {% endfor %}
+            {% for cat in post.categories %}
+            <category>{{ cat | xml_escape }}</category>
+            {% endfor %}
+        </item>
+        {% endif %}
+    {% endfor %}
+  </channel>
+</rss>

_posts/2015-04-28-example-post.markdown

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+---
+layout: post
+title:  "Example post"
+date:   2015-04-28 09:32:00
+categories: blog
+tags: jekyll social example post
+share: twitter --twitter-hashtags facebook linkedin
+---
+Hello world

social-feeds/facebook.xml

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+---
+layout: social-feed
+title: Facebook
+---

social-feeds/linkedin.xml

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+---
+layout: social-feed
+title: LinkedIn
+---

social-feeds/twitter.xml

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+---
+layout: null
+---
+<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+  <channel>
+    <title>{{ site.blog_title | xml_escape }}</title>
+    <description>{{ site.blog_description | xml_escape }}</description>
+    <link>{{ site.site_url }}{{ site.blog_url }}</link>
+    <atom:link href="{{ "/feed.xml" | prepend: site.blog_url | prepend: site.site_url }}" rel="self" type="application/rss+xml" />
+    <pubDate>{{ site.time | date_to_rfc822 }}</pubDate>
+    <lastBuildDate>{{ site.time | date_to_rfc822 }}</lastBuildDate>
+    <generator>Jekyll v{{ jekyll.version }}</generator>
+    {% assign platform = 'twitter' %}
+
+    {% for post in site.posts limit:10 %}
+        {% assign share_on = post.share | downcase %}
+
+        {% if share_on contains '--twitter-hashtags' %}
+            {% assign format_parsed = site.twitter_format | replace: '@title', post.title | replace: '@url', '' | replace: '@tags', '' | size %}
+            {% assign post_tags = '' %}
+            {% assign space_left = site.twitter_max_length | minus: format_parsed.size %}
+
+            {% if site.twitter_format contains '@url' %}
+                {% assign space_left = space_left | minus: site.twitter_url_length %}
+            {% endif %}
+
+            {% for tag in post.tags %}
+                {% capture new_tag %} #{{ tag }}{% endcapture %}
+                {% assign new_space_left = space_left | minus: new_tag.size %}
+
+                {% if new_space_left > 0 %}
+                    {% assign post_tags = post_tags | append: new_tag %}
+                    {% assign space_left = space_left | minus: new_tag.size %}
+                {% endif %}
+            {% endfor %}
+
+            {% assign post_title = site.twitter_format | replace: '@title', post.title | replace: '@tags', post_tags | replace: '@url', post.url %}
+        {% else %}
+            {% assign post_title = post.title %}
+        {% endif %}
+
+        {% if share_on contains platform %}
+        <item>
+            <title>{{ post_title | xml_escape }}</title>
+            <description>{{ post.content | xml_escape }}</description>
+            <pubDate>{{ post.date | date_to_rfc822 }}</pubDate>
+            <link>{{ post.url | prepend: site.site_url }}</link>
+            <guid isPermaLink="true">{{ post.url | prepend: site.site_url }}</guid>
+            {% for tag in post.tags %}
+            <category>{{ tag | xml_escape }}</category>
+            {% endfor %}
+            {% for cat in post.categories %}
+            <category>{{ cat | xml_escape }}</category>
+            {% endfor %}
+        </item>
+        {% endif %}
+    {% endfor %}
+  </channel>
+</rss>