Add internal Google Analytics template

This commits also adds the GoogleAnalytics
variable to insert the tracking code.

Fixes #1424.

docs/content/overview/introduction.md

@@ -127,6 +127,7 @@ Hugo boasts the following features:
 ### Additional Features
 
   * Integrated [Disqus](https://disqus.com/) comment support
+  * Integrated [Google Analytics](https://google-analytics.com/) support
   * Automatic [RSS](/layout/rss/) creation
   * Support for [Go](http://golang.org/pkg/html/template/), [Amber](https://github.com/eknkc/amber) and [Ace](http://ace.yoss.si/) HTML templates
   * Syntax [highlighting](/extras/highlighting/) powered by [Pygments](http://pygments.org/)
@@ -183,4 +184,3 @@ as I have writing it.
  * [Join the Mailing List](/community/mailing-list/)
  * [Star us on GitHub](https://github.com/spf13/hugo)
  * [Discussion Forum](http://discuss.gohugo.io/)
-

docs/content/templates/variables.md

@@ -127,6 +127,7 @@ Also available is `.Site` which has the following:
 **.Site.Author** A map of the authors as defined in the site configuration.<br>
 **.Site.LanguageCode** A string representing the language as defined in the site configuration.<br>
 **.Site.DisqusShortname** A string representing the shortname of the Disqus shortcode as defined in the site configuration.<br>
+**.Site.GoogleAnalytics** A string representing your tracking code for Google Analytics as defined in the site configuration.<br>
 **.Site.Copyright** A string representing the copyright of your web site as defined in the site configuration.<br>
 **.Site.LastChange** A string representing the date/time of the most recent change to your site, based on the [`date` variable]({{< ref "content/front-matter.md#required-variables" >}}) in the front matter of your content pages.<br>
 **.Site.Permalinks** A string to override the default permalink format. Defined in the site configuration.<br>

hugolib/site.go

@@ -106,6 +106,7 @@ type SiteInfo struct {
 	Author                map[string]interface{}
 	LanguageCode          string
 	DisqusShortname       string
+	GoogleAnalytics       string
 	Copyright             string
 	LastChange            time.Time
 	Permalinks            PermalinkOverrides
@@ -456,6 +457,7 @@ func (s *Site) initializeSiteInfo() {
 		LanguageCode:          viper.GetString("languagecode"),
 		Copyright:             viper.GetString("copyright"),
 		DisqusShortname:       viper.GetString("DisqusShortname"),
+		GoogleAnalytics:       viper.GetString("GoogleAnalytics"),
 		BuildDrafts:           viper.GetBool("BuildDrafts"),
 		canonifyURLs:          viper.GetBool("CanonifyURLs"),
 		preserveTaxonomyNames: viper.GetBool("PreserveTaxonomyNames"),

tpl/template_embedded.go

@@ -202,6 +202,18 @@ func (t *GoHTMLTemplate) EmbedTemplates() {
 
 <!-- Output all taxonomies as schema.org keywords -->
 <meta itemprop="keywords" content="{{ range $plural, $terms := .Site.Taxonomies }}{{ range $term, $val := $terms }}{{ printf "%s," $term }}{{ end }}{{ end }}" />
+{{ end }}`)
+
+	t.AddInternalTemplate("", "google_analytics.html", `{{ with .Site.GoogleAnalytics }}
+<script>
+(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+
+ga('create', '{{ . }}', 'auto');
+ga('send', 'pageview');
+</script>
 {{ end }}`)
 
 }