class Gem::Commands::UpdateCommand

# File lib/rubygems/commands/update_command.rb, line 22
def initialize
  options = {
    force: false,
  }

  options.merge!(install_update_options)

  super "update", "Update installed gems to the latest version", options

  add_install_update_options

  Gem::OptionParser.accept Gem::Version do |value|
    Gem::Version.new value

    value
  end

  add_option("--system [VERSION]", Gem::Version,
             "Update the RubyGems system software") do |value, opts|
    value ||= true

    opts[:system] = value
  end

  add_local_remote_options
  add_platform_option
  add_prerelease_option "as update targets"

  @updated   = []
  @installer = nil
end

# File lib/rubygems/commands/update_command.rb, line 97
def execute
  if options[:system]
    update_rubygems
    return
  end

  gems_to_update = which_to_update(
    highest_installed_gems,
    options[:args].uniq
  )

  if options[:explain]
    say "Gems to update:"

    gems_to_update.each do |name_tuple|
      say "  #{name_tuple.full_name}"
    end

    return
  end

  say "Updating installed gems"

  updated = update_gems gems_to_update

  installed_names = highest_installed_gems.keys
  updated_names = updated.map(&:name)
  not_updated_names = options[:args].uniq - updated_names
  not_installed_names = not_updated_names - installed_names
  up_to_date_names = not_updated_names - not_installed_names

  if updated.empty?
    say "Nothing to update"
  else
    say "Gems updated: #{updated_names.join(" ")}"
  end
  say "Gems already up-to-date: #{up_to_date_names.join(" ")}" unless up_to_date_names.empty?
  say "Gems not currently installed: #{not_installed_names.join(" ")}" unless not_installed_names.empty?
end

# File lib/rubygems/commands/update_command.rb, line 195
def preparing_gem_layout_for(version)
  if Gem::Version.new(version) >= Gem::Version.new("3.2.a")
    yield
  else
    require "tmpdir"
    Dir.mktmpdir("gem_update") do |tmpdir|
      FileUtils.mv Gem.plugindir, tmpdir

      status = yield

      unless status
        FileUtils.mv File.join(tmpdir, "plugins"), Gem.plugindir
      end

      status
    end
  end
end

# File lib/rubygems/commands/update_command.rb, line 214
def rubygems_target_version
  version = options[:system]
  update_latest = version == true

  unless update_latest
    version     = Gem::Version.new     version
    requirement = Gem::Requirement.new version

    return version, requirement
  end

  version     = Gem::Version.new     Gem::VERSION
  requirement = Gem::Requirement.new ">= #{Gem::VERSION}"

  rubygems_update         = Gem::Specification.new
  rubygems_update.name    = "rubygems-update"
  rubygems_update.version = version

  highest_remote_tup = highest_remote_name_tuple(rubygems_update)
  target = highest_remote_tup ? highest_remote_tup.version : version

  [target, requirement]
end

# File lib/rubygems/commands/update_command.rb, line 238
def update_gem(name, version = Gem::Requirement.default)
  return if @updated.any? {|spec| spec.name == name }

  update_options = options.dup
  update_options[:prerelease] = version.prerelease?

  @installer = Gem::DependencyInstaller.new update_options

  say "Updating #{name}" unless options[:system]
  begin
    @installer.install name, Gem::Requirement.new(version)
  rescue Gem::InstallError, Gem::DependencyError => e
    alert_error "Error installing #{name}:\n\t#{e.message}"
  end

  @installer.installed_gems.each do |spec|
    @updated << spec
  end
end

# File lib/rubygems/commands/update_command.rb, line 258
def update_gems(gems_to_update)
  gems_to_update.uniq.sort.each do |name_tuple|
    update_gem name_tuple.name, name_tuple.version
  end

  @updated
end

# File lib/rubygems/commands/update_command.rb, line 269
def update_rubygems
  if Gem.disable_system_update_message
    alert_error Gem.disable_system_update_message
    terminate_interaction 1
  end

  check_update_arguments

  version, requirement = rubygems_target_version

  check_latest_rubygems version

  check_oldest_rubygems version

  installed_gems = Gem::Specification.find_all_by_name "rubygems-update", requirement
  installed_gems = update_gem("rubygems-update", requirement) if installed_gems.empty? || installed_gems.first.version != version
  return if installed_gems.empty?

  install_rubygems installed_gems.first
end

# File lib/rubygems/commands/update_command.rb, line 300
def which_to_update(highest_installed_gems, gem_names)
  result = []

  highest_installed_gems.each do |_l_name, l_spec|
    next if !gem_names.empty? &&
            gem_names.none? {|name| name == l_spec.name }

    highest_remote_tup = highest_remote_name_tuple l_spec
    next unless highest_remote_tup

    result << highest_remote_tup
  end

  result
end