# File lib/brakeman/app_tree.rb, line 55
    def initialize(root, init_options = {})
      @root = root
      @project_root_path = Pathname.new(@root)
      @skip_files = init_options[:skip_files]
      @only_files = init_options[:only_files]
      @additional_libs_path = init_options[:additional_libs_path] || []
      @engine_paths = init_options[:engine_paths] || []
      @absolute_engine_paths = @engine_paths.select { |path| path.start_with?(File::SEPARATOR) }
      @relative_engine_paths = @engine_paths - @absolute_engine_paths
      @gemspec = nil
    end