Makes the project jump box work.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/work@2159 e93f8b46-1217-0410-a6f0-8f06a7374b81

nested_projects/app/helpers/application_helper.rb

@@ -147,6 +147,34 @@ module ApplicationHelper
     end
     content
   end
+  
+  # Renders the project quick-jump box
+  def render_project_jump_box
+    # Retrieve them now to avoid a COUNT query
+    projects = User.current.projects.all
+    if projects.any?
+      s = '<select onchange="if (this.value != '') { window.location = this.value; }">' +
+            "<option selected='selected'>#{ l(:label_jump_to_a_project) }</option>" +
+            '<option disabled="disabled">---</option>'
+      ancestors = []
+      project_tree(projects) do |project, level|
+        s << content_tag('option', ('&#187; ' * level) + h(project), :value => url_for(:controller => 'projects', :action => 'show', :id => project))
+      end
+      s << '</select>'
+    end
+  end
+  
+  # Yields the given block for each project with its level in the tree
+  def project_tree(projects, &block)
+    ancestors = []
+    projects.sort_by(&:lft).each do |project|
+      while (ancestors.any? && !project.is_descendant_of?(ancestors.last)) 
+        ancestors.pop
+      end
+      yield project, ancestors.size
+      ancestors << project
+    end
+  end
 
   # Truncates and returns the string as a single line
   def truncate_single_line(string, *args)