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require 'rubygems/command'
require 'rubygems/local_remote_options'
require 'rubygems/spec_fetcher'
require 'rubygems/version_option'

class Gem::Commands::OutdatedCommand < Gem::Command

  include Gem::LocalRemoteOptions
  include Gem::VersionOption

  def initialize
    super 'outdated', 'Display all gems that need updates'

    add_local_remote_options
    add_platform_option
  end

  def execute
    Gem::Specification.outdated.sort.each do |name|
      local   = Gem::Specification.find_all_by_name(name).max
      dep     = Gem::Dependency.new local.name, ">= #{local.version}"
      remotes, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dep

      next if remotes.empty?

      remotes.sort! { |a,b| a[0].version <=> b[0].version }

      highest = remotes.last.first

      say "#{local.name} (#{local.version} < #{highest.version})"
    end
  end
end