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Dir : //proc/self/root/opt/alt/ruby25/lib64/ruby/2.5.0/rubygems/commands/cleanup_command.rb

# frozen_string_literal: true
require 'rubygems/command'
require 'rubygems/dependency_list'
require 'rubygems/uninstaller'

class Gem::Commands::CleanupCommand < Gem::Command

  def initialize
    super 'cleanup',
          'Clean up old versions of installed gems',
          :force => false, :install_dir => Gem.dir,
          :check_dev => true

    add_option('-n', '-d', '--dryrun',
               'Do not uninstall gems') do |value, options|
      options[:dryrun] = true
    end

    add_option('-D', '--[no-]check-development',
               'Check development dependencies while uninstalling',
               '(default: true)') do |value, options|
      options[:check_dev] = value
    end

    @candidate_gems  = nil
    @default_gems    = []
    @full            = nil
    @gems_to_cleanup = nil
    @original_home   = nil
    @original_path   = nil
    @primary_gems    = nil
  end

  def arguments # :nodoc:
    "GEMNAME       name of gem to cleanup"
  end

  def defaults_str # :nodoc:
    "--no-dryrun"
  end

  def description # :nodoc:
    <<-EOF
The cleanup command removes old versions of gems from GEM_HOME that are not
required to meet a dependency.  If a gem is installed elsewhere in GEM_PATH
the cleanup command won't delete it.

If no gems are named all gems in GEM_HOME are cleaned.
    EOF
  end

  def usage # :nodoc:
    "#{program_name} [GEMNAME ...]"
  end

  def execute
    say "Cleaning up installed gems..."

    if options[:args].empty? then
      done     = false
      last_set = nil

      until done do
        clean_gems

        this_set = @gems_to_cleanup.map { |spec| spec.full_name }.sort

        done = this_set.empty? || last_set == this_set

        last_set = this_set
      end
    else
      clean_gems
    end

    say "Clean up complete"

    verbose do
      skipped = @default_gems.map { |spec| spec.full_name }

      "Skipped default gems: #{skipped.join ', '}"
    end
  end

  def clean_gems
    @original_home = Gem.dir
    @original_path = Gem.path

    get_primary_gems
    get_candidate_gems
    get_gems_to_cleanup

    @full = Gem::DependencyList.from_specs

    deplist = Gem::DependencyList.new
    @gems_to_cleanup.each do |spec| deplist.add spec end

    deps = deplist.strongly_connected_components.flatten

    deps.reverse_each do |spec|
      uninstall_dep spec
    end

    Gem::Specification.reset
  end

  def get_candidate_gems
    @candidate_gems = unless options[:args].empty? then
                        options[:args].map do |gem_name|
                          Gem::Specification.find_all_by_name gem_name
                        end.flatten
                      else
                        Gem::Specification.to_a
                      end
  end

  def get_gems_to_cleanup

    gems_to_cleanup = @candidate_gems.select { |spec|
      @primary_gems[spec.name].version != spec.version
    }

    default_gems, gems_to_cleanup = gems_to_cleanup.partition { |spec|
      spec.default_gem?
    }

    gems_to_cleanup = gems_to_cleanup.select { |spec|
      spec.base_dir == @original_home
    }

    @default_gems += default_gems
    @default_gems.uniq!
    @gems_to_cleanup = gems_to_cleanup.uniq
  end

  def get_primary_gems
    @primary_gems = {}

    Gem::Specification.each do |spec|
      if @primary_gems[spec.name].nil? or
         @primary_gems[spec.name].version < spec.version then
        @primary_gems[spec.name] = spec
      end
    end
  end

  def uninstall_dep spec
    return unless @full.ok_to_remove?(spec.full_name, options[:check_dev])

    if options[:dryrun] then
      say "Dry Run Mode: Would uninstall #{spec.full_name}"
      return
    end

    say "Attempting to uninstall #{spec.full_name}"

    uninstall_options = {
      :executables => false,
      :version => "= #{spec.version}",
    }

    uninstall_options[:user_install] = Gem.user_dir == spec.base_dir

    uninstaller = Gem::Uninstaller.new spec.name, uninstall_options

    begin
      uninstaller.uninstall
    rescue Gem::DependencyRemovalException, Gem::InstallError,
           Gem::GemNotInHomeException, Gem::FilePermissionError => e
      say "Unable to uninstall #{spec.full_name}:"
      say "\t#{e.class}: #{e.message}"
    end
  ensure
    # Restore path Gem::Uninstaller may have changed
    Gem.use_paths @original_home, *@original_path
  end

end