add seo_metadata liquid tag (Mario)

lib/locomotive/liquid/tags/seo_metadata.rb

@@ -0,0 +1,23 @@
+module Locomotive
+  module Liquid
+    module Tags
+      class SEOMetadata < ::Liquid::Tag
+
+        def render(context)
+          %{
+            <meta name="description" content="#{sanitized_string(context.registers[:site].meta_description)}" />
+            <meta name="keywords" content="#{sanitized_string(context.registers[:site].meta_keywords)}" />
+          }
+        end
+
+        # Removees whitespace and quote charactets from the input
+        def sanitized_string(string)
+          string.strip.gsub(/"/, '')
+        end
+
+      end
+
+      ::Liquid::Template.register_tag('seo_metadata', SEOMetadata)
+    end
+  end
+end

spec/lib/locomotive/liquid/tags/seo_metadata_spec.rb

@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+describe Locomotive::Liquid::Tags::SEOMetadata do
+
+  before :each do
+    @site = Factory.build(:site, :meta_description => 'A short site description', :meta_keywords => 'test only cat dog')
+  end
+
+  context '#rendering' do
+
+    it 'renders a a meta description tag' do
+      render_seo_metadata.should include '<meta name="description" content="A short site description" />'
+    end
+
+    it 'strips and removes quote characters from the description' do
+      @site.meta_description = ' String with " " quotes '
+      render_seo_metadata.should include '<meta name="description" content="String with   quotes" />'
+    end
+
+    it 'renders a meta keywords tag' do
+      render_seo_metadata.should include '<meta name="keywords" content="test only cat dog" />'
+    end
+
+    it 'strips and removes quote characters from the keywords' do
+      @site.meta_keywords = ' one " two " three '
+      render_seo_metadata.should include '<meta name="keywords" content="one  two  three" />'
+    end
+
+  end
+
+  def render_seo_metadata
+    registers = { :site => @site }
+    liquid_context = ::Liquid::Context.new({}, {}, registers)
+    output = Liquid::Template.parse("{% seo_metadata %}").render(liquid_context)
+  end
+
+end