Implentation for #2141

app/helpers/wiki_page_versions_helper.rb

@@ -48,4 +48,24 @@ module WikiPageVersionsHelper
 
     output.join.gsub(/\r?\n/, '<br>').html_safe
   end
+
+  def wiki_page_other_names_diff(thispage, otherpage)
+    new_names = otherpage.other_names_array
+    old_names = thispage.other_names_array
+    added_names = new_names - old_names
+    removed_names = old_names - new_names
+    unchanged_names = new_names & old_names
+
+    html = []
+    added_names.each do |name|
+      html << '<ins>' + name + '</ins>'
+    end
+    removed_names.each do |name|
+      html << '<del>' + name + '</del>'
+    end
+    unchanged_names.each do |name|
+      html << '<span>' + name + '</span>'
+    end
+    return html.join(" ").html_safe
+  end
 end

app/helpers/wiki_pages_helper.rb

@@ -47,4 +47,9 @@ module WikiPagesHelper
 
     html.html_safe
   end
+
+  def wiki_page_other_names_list(wiki_page)
+    names_html = wiki_page.other_names_array.map{|name| content_tag("span", name, :class => "other-name")}
+    names_html.join(", ").html_safe
+  end
 end