Redmine/lib/tasks/yardoc.rake

begin
  require 'yard'

  YARD::Rake::YardocTask.new do |t|
    files = ['lib/**/*.rb', 'app/**/*.rb']
    files << Dir['vendor/plugins/**/*.rb'].reject {|f| f.match(/test/) } # Exclude test files
    t.files = files
  end

rescue LoadError
  # yard not installed (gem install yard)
  # http://yardoc.org
end