Fix for google-analytics

src/book/mod.rs

@@ -29,8 +29,6 @@ pub struct MDBook {
     /// Should `mdbook build` create files referenced from SUMMARY.md if they
     /// don't exist
     pub create_missing: bool,
-
-    pub google_analytics: Option<String>,
 }
 
 impl MDBook {
@@ -75,7 +73,6 @@ impl MDBook {
 
             livereload: None,
             create_missing: true,
-            google_analytics: None,
         }
     }
 
@@ -492,6 +489,14 @@ impl MDBook {
         None
     }
 
+    pub fn get_google_analytics_id(&self) -> Option<String> {
+        if let Some(htmlconfig) = self.config.get_html_config() {
+            return htmlconfig.get_google_analytics_id();
+        }
+
+        None
+    }
+
     // Construct book
     fn parse_summary(&mut self) -> Result<(), Box<Error>> {
         // When append becomes stable, use self.content.append() ...

src/renderer/html_handlebars/hbs_renderer.rs

@@ -211,7 +211,7 @@ fn make_data(book: &MDBook) -> Result<serde_json::Map<String, serde_json::Value>
     }
 
     // Add google analytics tag
-    if let Some(ref ga) = book.google_analytics {
+    if let Some(ref ga) = book.get_google_analytics_id() {
         data.insert("google_analytics".to_owned(), json!(ga));
     }