[#169] Add a ROBOTS meta tag to several forms to hide from web spiders

Based on the patch by Yuki Sonoda

app/helpers/application_helper.rb

@@ -899,6 +899,14 @@ module ApplicationHelper
     "<link rel='shortcut icon' href='#{image_path('/favicon.ico')}' />"
   end
 
+  # Add a HTML meta tag to control robots (web spiders)
+  #
+  # @param [optional, String] content the content of the ROBOTS tag.
+  #   defaults to no index, follow, and no archive
+  def robot_exclusion_tag(content="NOINDEX,FOLLOW,NOARCHIVE")
+    "<meta name='ROBOTS' content='#{h(content)}' />"
+  end
+  
   # Returns true if arg is expected in the API response
   def include_in_api_response?(arg)
     unless @included_in_api_response

app/views/issue_moves/new.rhtml

@@ -74,3 +74,6 @@
 	<%= submit_tag l(:button_move_and_follow), :name => 'follow' %>
 <% end %>
 <% end %>
+<% content_for :header_tags do %>
+  <%= robot_exclusion_tag %>
+<% end %>

app/views/issues/edit.rhtml

@@ -1,3 +1,6 @@
 <h2><%=h "#{@issue.tracker.name} ##{@issue.id}" %></h2>
 
 <%= render :partial => 'edit' %>
+<% content_for :header_tags do %>
+  <%= robot_exclusion_tag %>
+<% end %>

app/views/issues/new.rhtml

@@ -23,4 +23,5 @@
 
 <% content_for :header_tags do %>
     <%= stylesheet_link_tag 'scm' %>
+    <%= robot_exclusion_tag %>
 <% end %>

app/views/wiki/edit.rhtml

@@ -23,6 +23,7 @@
 
 <% content_for :header_tags do %>
   <%= stylesheet_link_tag 'scm' %>
+  <%= robot_exclusion_tag %>
 <% end %>
 
 <% html_title @page.pretty_title %>