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require 'rubygems/command'
require 'rubygems/package'
require 'rubygems/installer'
require 'rubygems/version_option'

class Gem::Commands::PristineCommand < Gem::Command

  include Gem::VersionOption

  def initialize
    super 'pristine',
          'Restores installed gems to pristine condition from files located in the gem cache',
          :version => Gem::Requirement.default,
          :extensions => true,
          :all => false

    add_option('--all',
               'Restore all installed gems to pristine',
               'condition') do |value, options|
      options[:all] = value
    end

    add_option('--[no-]extensions',
               'Restore gems with extensions',
               'in addition to regular gems') do |value, options|
      options[:extensions] = value
    end

    add_option('--only-executables',
               'Only restore executables') do |value, options|
      options[:only_executables] = value
    end

    add_version_option('restore to', 'pristine condition')
  end

  def arguments # :nodoc:
    "GEMNAME       gem to restore to pristine condition (unless --all)"
  end

  def defaults_str # :nodoc:
    '--extensions'
  end

  def description # :nodoc:
    <<-EOF
The pristine command compares an installed gem with the contents of its
cached .gem file and restores any files that don't match the cached .gem's
copy.

If you have made modifications to an installed gem, the pristine command
will revert them.  All extensions are rebuilt and all bin stubs for the gem
are regenerated after checking for modifications.

If the cached gem cannot be found it will be downloaded.

If --no-extensions is provided pristine will not attempt to restore a gem
with an extension.
    EOF
  end

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

  def execute
    specs = if options[:all] then
              Gem::Specification.map
            else
              get_all_gem_names.map do |gem_name|
                Gem::Specification.find_all_by_name gem_name, options[:version]
              end.flatten
            end

    if specs.to_a.empty? then
      raise Gem::Exception,
            "Failed to find gems #{options[:args]} #{options[:version]}"
    end

    install_dir = Gem.dir # TODO use installer option

    raise Gem::FilePermissionError.new(install_dir) unless
      File.writable?(install_dir)

    say "Restoring gems to pristine condition..."

    specs.each do |spec|
      if spec.default_gem?
        say "Skipped #{spec.full_name}, it is a default gem"
        next
      end

      unless spec.extensions.empty? or options[:extensions] then
        say "Skipped #{spec.full_name}, it needs to compile an extension"
        next
      end

      gem = spec.cache_file

      unless File.exist? gem then
        require 'rubygems/remote_fetcher'

        say "Cached gem for #{spec.full_name} not found, attempting to fetch..."
        dep = Gem::Dependency.new spec.name, spec.version
        Gem::RemoteFetcher.fetcher.download_to_cache dep
      end

      # TODO use installer options
      install_defaults = Gem::ConfigFile::PLATFORM_DEFAULTS['install']
      installer_env_shebang = install_defaults.to_s['--env-shebang']

      installer = Gem::Installer.new(gem,
                                     :wrappers => true,
                                     :force => true,
                                     :install_dir => spec.base_dir,
                                     :env_shebang => installer_env_shebang,
                                     :build_args => spec.build_args)
      if options[:only_executables] then
        installer.generate_bin
      else
        installer.install
      end

      say "Restored #{spec.full_name}"
    end
  end
end

Filemanager

DIR : / usr/ share/ rubygems/ rubygems/ commands/
Name Type Size Permission Actions
build_command.rb File 859 B 0644
cert_command.rb File 6.41 KB 0644
check_command.rb File 2.01 KB 0644
cleanup_command.rb File 3.82 KB 0644
contents_command.rb File 3.12 KB 0644
dependency_command.rb File 3.89 KB 0644
environment_command.rb File 4.16 KB 0644
fetch_command.rb File 1.49 KB 0644
generate_index_command.rb File 2.52 KB 0644
help_command.rb File 4.56 KB 0644
install_command.rb File 5.45 KB 0644
list_command.rb File 696 B 0644
lock_command.rb File 2.67 KB 0644
mirror_command.rb File 395 B 0644
outdated_command.rb File 866 B 0644
owner_command.rb File 1.9 KB 0644
pristine_command.rb File 3.66 KB 0644
push_command.rb File 2.02 KB 0644
query_command.rb File 8.11 KB 0644
rdoc_command.rb File 2.31 KB 0644
search_command.rb File 616 B 0644
server_command.rb File 2.35 KB 0644
setup_command.rb File 12.94 KB 0644
sources_command.rb File 3.62 KB 0644
specification_command.rb File 2.93 KB 0644
stale_command.rb File 704 B 0644
uninstall_command.rb File 3.07 KB 0644
unpack_command.rb File 4.06 KB 0644
update_command.rb File 5.8 KB 0644
which_command.rb File 1.87 KB 0644
yank_command.rb File 2.4 KB 0644