excerpt first paragraph (#338)

Author: DrMagPie

Gemfile

@@ -1,6 +1,7 @@
 source "https://rubygems.org"
 
 gem "jekyll"
+gem "nokogiri"
 group :jekyll_plugins do
   gem "jekyll-paginate"
   gem "jekyll-seo-tag"

_layouts/home.html

@@ -19,8 +19,8 @@ <h3>{{ post.title }}</h3>
 				{% include author.html %}
 			</div>
 			<hr>
-			<div class="snippet snippet-2">
-				<p>{{ post.content | strip_html | truncatewords:50 }}</p>
+			<div class="snippet">
+				<p>{{ post.content | first_paragraph | strip_html}}</p>
 			</div>
 		</div>
 	</a>

_plugins/first_paragraph.rb

@@ -0,0 +1,18 @@
+#
+# Jekyll plugin that adds the `first_paragraph` Liquid filter, which returns
+# only the first paragraph of an HTML string.
+#
+
+require 'nokogiri'
+
+
+module Jekyll
+  module AssetFilter
+    def first_paragraph(html)
+      paragraph = Nokogiri::HTML(html).css('p').first.to_html
+    end
+  end
+end
+
+
+Liquid::Template.register_filter(Jekyll::AssetFilter)