execute

# File lib/rubygems/commands/fetch_command.rb, line 45
  def execute
    version = options[:version] || Gem::Requirement.default

    platform  = Gem.platforms.last
    gem_names = get_all_gem_names

    gem_names.each do |gem_name|
      dep = Gem::Dependency.new gem_name, version
      dep.prerelease = options[:prerelease]

      specs_and_sources, errors =
        Gem::SpecFetcher.fetcher.spec_for_dependency dep

      if platform then
        filtered = specs_and_sources.select { |s,| s.platform == platform }
        specs_and_sources = filtered unless filtered.empty?
      end

      spec, source = specs_and_sources.max_by { |s,| s.version }

      if spec.nil? then
        show_lookup_failure gem_name, version, errors, options[:domain]
        next
      end

      source.download spec

      say "Downloaded #{spec.full_name}"
    end
  end