Improve handling of meta description

.themes/classic/source/_includes/head.html

@@ -8,7 +8,7 @@
   <meta name="author" content="{{ site.author }}">
 
   {% capture description %}{% if page.description %}{{ page.description }}{% else %}{{ content | raw_content }}{% endif %}{% endcapture %}
-  <meta name="description" content="{{ description | strip_newlines | strip_html | truncate:150 }}">
+  <meta name="description" content="{{ description | strip_html | condense_spaces | truncate:150 }}">
   {% if page.keywords %}<meta name="keywords" content="{{ page.keywords }}">{% endif %}
 
   <!-- http://t.co/dKP3o1e -->

plugins/octopress_filters.rb

@@ -79,6 +79,33 @@ module OctopressLiquidFilters
     end
   end
 
+  # Improved version of Liquid's truncate:
+  # - Doesn't cut in the middle of a word.
+  # - Uses typographically correct ellipsis (…) insted of '...'
+  def truncate(input, length)
+    if input.length > length && input[0..(length-1)] =~ /(.+)\b.+$/im
+      $1.strip + ' …'
+    else
+      input
+    end
+  end
+
+  # Improved version of Liquid's truncatewords:
+  # - Uses typographically correct ellipsis (…) insted of '...'
+  def truncatewords(input, length)
+    truncate = input.split(' ')
+    if truncate.length > length
+      truncate[0..length-1].join(' ').strip + ' …'
+    else
+      input
+    end
+  end
+
+  # Condenses multiple spaces and tabs into a single space
+  def condense_spaces(input)
+    input.gsub(/\s{2,}/, ' ')
+  end
+
   # Removes trailing forward slash from a string for easily appending url segments
   def strip_slash(input)
     if input =~ /(.+)\/$|^\/$/