class Gem::Commands::SpecificationCommand

def execute
  specs = []
  gem = options[:args].shift
  unless gem
    raise Gem::CommandLineError,
          "Please specify a gem name or file on the command line"
  end
  case v = options[:version]
  when String
    req = Gem::Requirement.create v
  when Gem::Requirement
    req = v
  else
    raise Gem::CommandLineError, "Unsupported version type: '#{v}'"
  end
  if !req.none? && options[:all]
    alert_error "Specify --all or -v, not both"
    terminate_interaction 1
  end
  if options[:all]
    dep = Gem::Dependency.new gem
  else
    dep = Gem::Dependency.new gem, req
  end
  field = get_one_optional_argument
  raise Gem::CommandLineError, "--ruby and FIELD are mutually exclusive" if
    field && options[:format] == :ruby
  if local?
    if File.exist? gem
      begin
        specs << Gem::Package.new(gem).spec
      rescue StandardError
        nil
      end
    end
    if specs.empty?
      specs.push(*dep.matching_specs)
    end
  end
  if remote?
    dep.prerelease = options[:prerelease]
    found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dep
    specs.push(*found.map {|spec,| spec })
  end
  if specs.empty?
    alert_error "No gem matching '#{dep}' found"
    terminate_interaction 1
  end
  platform = get_platform_from_requirements(options)
  if platform
    specs = specs.select {|s| s.platform.to_s == platform }
  end
  unless options[:all]
    specs = [specs.max_by(&:version)]
  end
  specs.each do |s|
    s = s.send field if field
    say case options[:format]
        when :ruby then s.to_ruby
        when :marshal then Marshal.dump s
        else s.to_yaml
    end
    say "\n"
  end
end