Redmine/app/views/repositories/_navigation.rhtml

<%= link_to 'root', :action => 'browse', :id => @project, :path => '', :rev => @rev %>
<% 
dirs = path.split('/')
if 'file' == kind
    filename = dirs.pop
end
link_path = ''
dirs.each do |dir| 
    link_path << '/' unless link_path.empty?
    link_path << "#{dir}" 
    %>
    / <%= link_to h(dir), :action => 'browse', :id => @project, :path => link_path, :rev => @rev %>
<% end %>
<% if filename %>
    / <%= link_to h(filename), :action => 'revisions', :id => @project, :path => "#{link_path}/#{filename}", :rev => @rev %>
<% end %>

<%= "@ #{revision}" if revision %>