execute (Gem::Commands::DependencyCommand)

    # File lib/rubygems/commands/dependency_command.rb, line 45
      def execute
        options[:args] << '.' if options[:args].empty?
        specs = {}

        source_indexes = []

        if local? then
          source_indexes << Gem::SourceIndex.from_installed_gems
        end

        if remote? then
          Gem::SourceInfoCache.cache_data.map do |_, sice|
            source_indexes << sice.source_index
          end
        end

        options[:args].each do |name|
          new_specs = nil
          source_indexes.each do |source_index|
            new_specs =  find_gems(name, source_index)
          end

          say "No match found for #{name} (#{options[:version]})" if
            new_specs.empty?

          specs = specs.merge new_specs
        end

        terminate_interaction 1 if specs.empty?

        reverse = Hash.new { |h, k| h[k] = [] }

        if options[:reverse_dependencies] then
          specs.values.each do |source_index, spec|
            reverse[spec.full_name] = find_reverse_dependencies spec, source_index
          end
        end

        if options[:pipe_format] then
          specs.values.sort_by { |_, spec| spec }.each do |_, spec|
            unless spec.dependencies.empty?
              spec.dependencies.each do |dep|
                say "#{dep.name} --version '#{dep.version_requirements}'"
              end
            end
          end
        else
          response = ''

          specs.values.sort_by { |_, spec| spec }.each do |_, spec|
            response << print_dependencies(spec)
            unless reverse[spec.full_name].empty? then
              response << "  Used by\n"
              reverse[spec.full_name].each do |sp, dep|
                response << "    #{sp} (#{dep})\n"
              end
            end
            response << "\n"
          end

          say response
        end
      end