Do not merge title and site title for OpenGraph.

Site title is available for reference as `:site`, and full title as `:full_title`.
Closes #119.

.rubocop.yml

@@ -838,7 +838,7 @@ Style/ParallelAssignment:
                   matches on both sides of the assignment.
                   This also provides performance benefits
   StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#parallel-assignment'
-  Enabled: true
+  Enabled: false
 
 Style/ParenthesesAroundCondition:
   Description: >-

CHANGELOG.md

@@ -7,6 +7,7 @@ Features:
 
 Bugfixes:
   - When title limit reached with `reverse` set to `true`, properly truncate the last item of the title array instead of the first one.
+  - Do not merge title and site title for OpenGraph, site title is available for reference as `:site`, and full title as `:full_title`.
 
 Changes:
   - Removed Google "author" and "publisher" links, as Google deprecated these options (https://support.google.com/webmasters/answer/6083347?hl=en)

README.md

@@ -197,7 +197,8 @@ Say, you have the following in your application layout:
 
 ```ruby
 display_meta_tags og: {
-  title: :title
+  title: :title,
+  site_name: :site,
 }
 ```
 
@@ -214,6 +215,9 @@ You get this open graph meta tag for free:
 <meta property="og:title" content="my great view"></meta>
 ```
 
+Please note, that title does not include site. If you need to reference the exact
+value rendered in the `<title>` meta tag, use `:full_title`.
+
 ### Using with Turbolinks
 
 [Turbolinks](https://github.com/turbolinks/turbolinks) is a simple solution for getting

lib/meta_tags/meta_tags_collection.rb

@@ -60,6 +60,17 @@ def full_title(defaults = {})
       with_defaults(defaults) { extract_full_title }
     end
 
+    # Constructs the title without site title (for normalized parameters).
+    #
+    # @return [String] page title.
+    #
+    def page_title(defaults = {})
+      old_site, @meta_tags[:site] = @meta_tags[:site], nil
+      with_defaults(defaults) { extract_full_title }
+    ensure
+      @meta_tags[:site] = old_site
+    end
+
     # Deletes and returns a meta tag value by name.
     #
     # @param [String, Symbol] name meta tag name.

lib/meta_tags/renderer.rb

@@ -51,8 +51,10 @@ def render_charset(tags)
     # @param [Array<Tag>] tags a buffer object to store tag in.
     #
     def render_title(tags)
+      normalized_meta_tags[:title] = meta_tags.page_title
+      normalized_meta_tags[:site] = meta_tags[:site]
       title = meta_tags.extract_full_title
-      normalized_meta_tags[:title] = title
+      normalized_meta_tags[:full_title] = title
       tags << ContentTag.new(:title, content: title) if title.present?
     end
 

spec/view_helper/open_graph_spec.rb

@@ -59,6 +59,15 @@
     end
   end
 
+  it "should properly handle title and site title in mirrored content" do
+    subject.set_meta_tags(title: 'someTitle', site: 'someSite')
+    subject.display_meta_tags(open_graph: { title: :title, site_name: :site, full_title: :full_title }).tap do |meta|
+      expect(meta).to have_tag('meta', with: { content: "someTitle", property: "og:title" })
+      expect(meta).to have_tag('meta', with: { content: "someSite", property: "og:site_name" })
+      expect(meta).to have_tag('meta', with: { content: "someSite | someTitle", property: "og:full_title" })
+    end
+  end
+
   it "should display open graph meta tags with an array of images" do
     subject.set_meta_tags(open_graph: {
       title: 'someTitle',