class Gem::Commands::UpdateCommand

# File lib/rubygems/commands/update_command.rb, line 21
def initialize
  super 'update', 'Update installed gems to the latest version',
    :document => %w[rdoc ri],
    :force    => false

  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, options|
    value = true unless value

    options[: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 91
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

  updated_names = updated.map {|spec| spec.name }
  not_updated_names = options[:args].uniq - updated_names

  if updated.empty?
    say "Nothing to update"
  else
    say "Gems updated: #{updated_names.join(' ')}"
    say "Gems already up-to-date: #{not_updated_names.join(' ')}" unless not_updated_names.empty?
  end
end

# File lib/rubygems/commands/update_command.rb, line 187
def preparing_gem_layout_for(version)
  if Gem::Version.new(version) >= Gem::Version.new("3.2.a")
    yield
  else
    require "tmpdir"
    tmpdir = Dir.mktmpdir
    FileUtils.mv Gem.plugindir, tmpdir

    status = yield

    if status
      FileUtils.rm_rf tmpdir
    else
      FileUtils.mv File.join(tmpdir, "plugins"), Gem.plugindir
    end

    status
  end
end

# File lib/rubygems/commands/update_command.rb, line 207
def rubygems_target_version
  version = options[:system]
  update_latest = version == true

  if update_latest
    version     = Gem::Version.new     Gem::VERSION
    requirement = Gem::Requirement.new ">= #{Gem::VERSION}"
  else
    version     = Gem::Version.new     version
    requirement = Gem::Requirement.new version
  end

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

  hig = {
    'rubygems-update' => rubygems_update,
  }

  gems_to_update = which_to_update hig, options[:args], :system
  up_ver = gems_to_update.first.version

  target = if update_latest
             up_ver
           else
             version
           end

  return target, requirement
end

# File lib/rubygems/commands/update_command.rb, line 239
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] && options[:silent]
  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 259
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 270
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

  update_gem 'rubygems-update', version

  installed_gems = Gem::Specification.find_all_by_name 'rubygems-update', requirement
  version        = installed_gems.first.version

  install_rubygems version
end

# File lib/rubygems/commands/update_command.rb, line 304
def which_to_update(highest_installed_gems, gem_names, system = false)
  result = []

  highest_installed_gems.each do |l_name, l_spec|
    next if not gem_names.empty? and
            gem_names.none? {|name| name == l_spec.name }

    highest_remote_tup = highest_remote_name_tuple l_spec
    highest_remote_ver = highest_remote_tup.version
    highest_installed_ver = l_spec.version

    if system or (highest_installed_ver < highest_remote_ver)
      result << Gem::NameTuple.new(l_spec.name, [highest_installed_ver, highest_remote_ver].max, highest_remote_tup.platform)
    end
  end

  result
end

# File lib/rubygems/commands/update_command.rb, line 331
def oldest_supported_version
  @oldest_supported_version ||=
    if Gem.ruby_version > Gem::Version.new("3.0.a")
      Gem::Version.new("3.2.3")
    elsif Gem.ruby_version > Gem::Version.new("2.7.a")
      Gem::Version.new("3.1.2")
    elsif Gem.ruby_version > Gem::Version.new("2.6.a")
      Gem::Version.new("3.0.1")
    elsif Gem.ruby_version > Gem::Version.new("2.5.a")
      Gem::Version.new("2.7.3")
    elsif Gem.ruby_version > Gem::Version.new("2.4.a")
      Gem::Version.new("2.6.8")
    else
      Gem::Version.new("2.5.2")
    end
end