def app_options
      if ambiguous?
        hash = {}
        @global_options.each_with_index do |option, i|
          hash[i] = option['name'] || option['root']
        end
        hash
      else
        {}
      end
    end
def app_options
      if ambiguous?
        hash = {}
        @global_options.each_with_index do |option, i|
          hash[i] = option['name'] || option['root']
        end
        hash
      else
        {}
      end
    end
Return an hash of possible options to settle the ambiguity