[Users] Add link for email domain search

app/helpers/users_helper.rb

@@ -2,4 +2,11 @@ module UsersHelper
   def email_sig(user, purpose, expires = nil)
     EmailLinkValidator.generate("#{user.id}", purpose, expires)
   end
+
+  def email_domain_search(email)
+    return unless email.include?("@")
+
+    domain = email.split("@").last
+    link_to "»", users_path(search: { email_matches: "*@#{domain}" })
+  end
 end

app/views/users/_statistics.html.erb

@@ -84,7 +84,10 @@
 
         <% if CurrentUser.is_admin? %>
           <span>Email</span>
-          <span><%= user.email %></span>
+          <span>
+            <%= user.email %>
+            <%= email_domain_search(user.email) %>
+          </span>
         <% end %>
 
         <% if CurrentUser.is_moderator? %>

app/views/users/index.html.erb

@@ -34,7 +34,10 @@
             <td><%= link_to user.post_upload_count, posts_path(:tags => "user:#{user.name}") %></td>
             <td><%= user.post_deleted_count %></td>
             <% if CurrentUser.is_moderator? %>
-              <td><%= user.email %></td>
+              <td>
+                <%= user.email %>
+                <%= email_domain_search(user.email) %>
+              </td>
               <td><%= link_to_ip(user.last_ip_addr) %></td>
             <% end %>
             <td><%= link_to user.note_version_count, note_versions_path(:search => {:updater_id => user.id}) %></td>