text: """distutils.dist
  
  Provides the Distribution class, which represents the module distribution
  being built/installed/distributed.
  """
  import sys
  import os
  import re
  from email import message_from_file
  try:
      import warnings
  except ImportError:
      warnings = None
  from distutils.errors import *
  from distutils.fancy_getopt import FancyGetopt, translate_longopt
  from distutils.util import check_environ, strtobool, rfc822_escape
  from distutils import log
  from distutils.debug import DEBUG
  command_re = re.compile('^[a-zA-Z]([a-zA-Z0-9_]*)$')
  
  
  class Distribution:
      """The core of the Distutils.  Most of the work hiding behind 'setup'
      is really done within a Distribution instance, which farms the work out
      to the Distutils commands specified on the command line.
  
      Setup scripts will almost never instantiate Distribution directly,
      unless the 'setup()' function is totally inadequate to their needs.
      However, it is conceivable that a setup script might wish to subclass
      Distribution for some specialized purpose, and then pass the subclass
      to 'setup()' as the 'distclass' keyword argument.  If so, it is
      necessary to respect the expectations that 'setup' has of Distribution.
      See the code for 'setup()', in core.py, for details.
      """
      global_options = [('verbose', 'v', 'run verbosely (default)', 1), (
          'quiet', 'q', 'run quietly (turns verbosity off)'), ('dry-run', 'n',
          "don't actually do anything"), ('help', 'h',
          'show detailed help message'), ('no-user-cfg', None,
          'ignore pydistutils.cfg in your home directory')]
      common_usage = """Common commands: (see '--help-commands' for more)
  
    setup.py build      will build the package underneath 'build/'
    setup.py install    will install the package
  """
      display_options = [('help-commands', None,
          'list all available commands'), ('name', None, 'print package name'
          ), ('version', 'V', 'print package version'), ('fullname', None,
          'print <package name>-<version>'), ('author', None,
          "print the author's name"), ('author-email', None,
          "print the author's email address"), ('maintainer', None,
          "print the maintainer's name"), ('maintainer-email', None,
          "print the maintainer's email address"), ('contact', None,
          "print the maintainer's name if known, else the author's"), (
          'contact-email', None,
          "print the maintainer's email address if known, else the author's"),
          ('url', None, 'print the URL for this package'), ('license', None,
          'print the license of the package'), ('licence', None,
          'alias for --license'), ('description', None,
          'print the package description'), ('long-description', None,
          'print the long package description'), ('platforms', None,
          'print the list of platforms'), ('classifiers', None,
          'print the list of classifiers'), ('keywords', None,
          'print the list of keywords'), ('provides', None,
          'print the list of packages/modules provided'), ('requires', None,
          'print the list of packages/modules required'), ('obsoletes', None,
          'print the list of packages/modules made obsolete')]
      display_option_names = [translate_longopt(x[0]) for x in display_options]
      negative_opt = {'quiet': 'verbose'}
  
      def __init__(self, attrs=None):
          """Construct a new Distribution instance: initialize all the
          attributes of a Distribution, and then use 'attrs' (a dictionary
          mapping attribute names to values) to assign some of those
          attributes their "real" values.  (Any attributes not mentioned in
          'attrs' will be assigned to some null value: 0, None, an empty list
          or dictionary, etc.)  Most importantly, initialize the
          'command_obj' attribute to the empty dictionary; this will be
          filled in with real command objects by 'parse_command_line()'.
          """
          self.verbose = 1
          self.dry_run = 0
          self.help = 0
          for attr in self.display_option_names:
              setattr(self, attr, 0)
          self.metadata = DistributionMetadata()
          for basename in self.metadata._METHOD_BASENAMES:
              method_name = 'get_' + basename
              setattr(self, method_name, getattr(self.metadata, method_name))
          self.cmdclass = {}
          self.command_packages = None
          self.script_name = None
          self.script_args = None
          self.command_options = {}
          self.dist_files = []
          self.packages = None
          self.package_data = {}
          self.package_dir = None
          self.py_modules = None
          self.libraries = None
          self.headers = None
          self.ext_modules = None
          self.ext_package = None
          self.include_dirs = None
          self.extra_path = None
          self.scripts = None
          self.data_files = None
          self.password = ''
          self.command_obj = {}
          self.have_run = {}
          if attrs:
              options = attrs.get('options')
              if options is not None:
                  del attrs['options']
                  for command, cmd_options in options.items():
                      opt_dict = self.get_option_dict(command)
                      for opt, val in cmd_options.items():
                          opt_dict[opt] = 'setup script', val
              if 'licence' in attrs:
                  attrs['license'] = attrs['licence']
                  del attrs['licence']
                  msg = (
                      "'licence' distribution option is deprecated; use 'license'"
                      )
                  if warnings is not None:
                      warnings.warn(msg)
                  else:
                      sys.stderr.write(msg + '\n')
              for key, val in attrs.items():
                  if hasattr(self.metadata, 'set_' + key):
                      getattr(self.metadata, 'set_' + key)(val)
                  elif hasattr(self.metadata, key):
                      setattr(self.metadata, key, val)
                  elif hasattr(self, key):
                      setattr(self, key, val)
                  else:
                      msg = 'Unknown distribution option: %s' % repr(key)
                      if warnings is not None:
                          warnings.warn(msg)
                      else:
                          sys.stderr.write(msg + '\n')
          self.want_user_cfg = True
          if self.script_args is not None:
              for arg in self.script_args:
                  if not arg.startswith('-'):
                      break
                  if arg == '--no-user-cfg':
                      self.want_user_cfg = False
                      break
          self.finalize_options()
  
      def get_option_dict(self, command):
          """Get the option dictionary for a given command.  If that
          command's option dictionary hasn't been created yet, then create it
          and return the new dictionary; otherwise, return the existing
          option dictionary.
          """
          dict = self.command_options.get(command)
          if dict is None:
              dict = self.command_options[command] = {}
          return dict
  
      def dump_option_dicts(self, header=None, commands=None, indent=''):
          from pprint import pformat
          if commands is None:
              commands = sorted(self.command_options.keys())
          if header is not None:
              self.announce(indent + header)
              indent = indent + '  '
          if not commands:
              self.announce(indent + 'no commands known yet')
              return
          for cmd_name in commands:
              opt_dict = self.command_options.get(cmd_name)
              if opt_dict is None:
                  self.announce(indent + "no option dict for '%s' command" %
                      cmd_name)
              else:
                  self.announce(indent + "option dict for '%s' command:" %
                      cmd_name)
                  out = pformat(opt_dict)
                  for line in out.split('\n'):
                      self.announce(indent + '  ' + line)
  
      def find_config_files(self):
          """Find as many configuration files as should be processed for this
          platform, and return a list of filenames in the order in which they
          should be parsed.  The filenames returned are guaranteed to exist
          (modulo nasty race conditions).
  
          There are three possible config files: distutils.cfg in the
          Distutils installation directory (ie. where the top-level
          Distutils __inst__.py file lives), a file in the user's home
          directory named .pydistutils.cfg on Unix and pydistutils.cfg
          on Windows/Mac; and setup.cfg in the current directory.
  
          The file in the user's home directory can be disabled with the
          --no-user-cfg option.
          """
          files = []
          check_environ()
          sys_dir = os.path.dirname(sys.modules['distutils'].__file__)
          sys_file = os.path.join(sys_dir, 'distutils.cfg')
          if os.path.isfile(sys_file):
              files.append(sys_file)
          if os.name == 'posix':
              user_filename = '.pydistutils.cfg'
          else:
              user_filename = 'pydistutils.cfg'
          if self.want_user_cfg:
              user_file = os.path.join(os.path.expanduser('~'), user_filename)
              if os.path.isfile(user_file):
                  files.append(user_file)
          local_file = 'setup.cfg'
          if os.path.isfile(local_file):
              files.append(local_file)
          if DEBUG:
              self.announce('using config files: %s' % ', '.join(files))
          return files
  
      def parse_config_files(self, filenames=None):
          from configparser import ConfigParser
          if sys.prefix != sys.base_prefix:
              ignore_options = ['install-base', 'install-platbase',
                  'install-lib', 'install-platlib', 'install-purelib',
                  'install-headers', 'install-scripts', 'install-data',
                  'prefix', 'exec-prefix', 'home', 'user', 'root']
          else:
              ignore_options = []
          ignore_options = frozenset(ignore_options)
          if filenames is None:
              filenames = self.find_config_files()
          if DEBUG:
              self.announce('Distribution.parse_config_files():')
          parser = ConfigParser()
          for filename in filenames:
              if DEBUG:
                  self.announce('  reading %s' % filename)
              parser.read(filename)
              for section in parser.sections():
                  options = parser.options(section)
                  opt_dict = self.get_option_dict(section)
                  for opt in options:
                      if opt != '__name__' and opt not in ignore_options:
                          val = parser.get(section, opt)
                          opt = opt.replace('-', '_')
                          opt_dict[opt] = filename, val
              parser.__init__()
          if 'global' in self.command_options:
              for opt, (src, val) in self.command_options['global'].items():
                  alias = self.negative_opt.get(opt)
                  try:
                      if alias:
                          setattr(self, alias, not strtobool(val))
                      elif opt in ('verbose', 'dry_run'):
                          setattr(self, opt, strtobool(val))
                      else:
                          setattr(self, opt, val)
                  except ValueError as msg:
                      raise DistutilsOptionError(msg)
  
      def parse_command_line(self):
          """Parse the setup script's command line, taken from the
          'script_args' instance attribute (which defaults to 'sys.argv[1:]'
          -- see 'setup()' in core.py).  This list is first processed for
          "global options" -- options that set attributes of the Distribution
          instance.  Then, it is alternately scanned for Distutils commands
          and options for that command.  Each new command terminates the
          options for the previous command.  The allowed options for a
          command are determined by the 'user_options' attribute of the
          command class -- thus, we have to be able to load command classes
          in order to parse the command line.  Any error in that 'options'
          attribute raises DistutilsGetoptError; any error on the
          command-line raises DistutilsArgError.  If no Distutils commands
          were found on the command line, raises DistutilsArgError.  Return
          true if command-line was successfully parsed and we should carry
          on with executing commands; false if no errors but we shouldn't
          execute commands (currently, this only happens if user asks for
          help).
          """
          toplevel_options = self._get_toplevel_options()
          self.commands = []
          parser = FancyGetopt(toplevel_options + self.display_options)
          parser.set_negative_aliases(self.negative_opt)
          parser.set_aliases({'licence': 'license'})
          args = parser.getopt(args=self.script_args, object=self)
          option_order = parser.get_option_order()
          log.set_verbosity(self.verbose)
          if self.handle_display_options(option_order):
              return
          while args:
              args = self._parse_command_opts(parser, args)
              if args is None:
                  return
          if self.help:
              self._show_help(parser, display_options=len(self.commands) == 0,
                  commands=self.commands)
              return
          if not self.commands:
              raise DistutilsArgError('no commands supplied')
          return True
  
      def _get_toplevel_options(self):
          """Return the non-display options recognized at the top level.
  
          This includes options that are recognized *only* at the top
          level as well as options recognized for commands.
          """
          return self.global_options + [('command-packages=', None,
              'list of packages that provide distutils commands')]
  
      def _parse_command_opts(self, parser, args):
          """Parse the command-line options for a single command.
          'parser' must be a FancyGetopt instance; 'args' must be the list
          of arguments, starting with the current command (whose options
          we are about to parse).  Returns a new version of 'args' with
          the next command at the front of the list; will be the empty
          list if there are no more commands on the command line.  Returns
          None if the user asked for help on this command.
          """
          from distutils.cmd import Command
          command = args[0]
          if not command_re.match(command):
              raise SystemExit("invalid command name '%s'" % command)
          self.commands.append(command)
          try:
              cmd_class = self.get_command_class(command)
          except DistutilsModuleError as msg:
              raise DistutilsArgError(msg)
          if not issubclass(cmd_class, Command):
              raise DistutilsClassError(
                  'command class %s must subclass Command' % cmd_class)
          if not (hasattr(cmd_class, 'user_options') and isinstance(cmd_class
              .user_options, list)):
              msg = (
                  "command class %s must provide 'user_options' attribute (a list of tuples)"
                  )
              raise DistutilsClassError(msg % cmd_class)
          negative_opt = self.negative_opt
          if hasattr(cmd_class, 'negative_opt'):
              negative_opt = negative_opt.copy()
              negative_opt.update(cmd_class.negative_opt)
          if hasattr(cmd_class, 'help_options') and isinstance(cmd_class.
              help_options, list):
              help_options = fix_help_options(cmd_class.help_options)
          else:
              help_options = []
          parser.set_option_table(self.global_options + cmd_class.
              user_options + help_options)
          parser.set_negative_aliases(negative_opt)
          args, opts = parser.getopt(args[1:])
          if hasattr(opts, 'help') and opts.help:
              self._show_help(parser, display_options=0, commands=[cmd_class])
              return
          if hasattr(cmd_class, 'help_options') and isinstance(cmd_class.
              help_options, list):
              help_option_found = 0
              for help_option, short, desc, func in cmd_class.help_options:
                  if hasattr(opts, parser.get_attr_name(help_option)):
                      help_option_found = 1
                      if callable(func):
                          func()
                      else:
                          raise DistutilsClassError(
                              "invalid help function %r for help option '%s': must be a callable object (function, etc.)"
                               % (func, help_option))
              if help_option_found:
                  return
          opt_dict = self.get_option_dict(command)
          for name, value in vars(opts).items():
              opt_dict[name] = 'command line', value
          return args
  
      def finalize_options(self):
          """Set final values for all the options on the Distribution
          instance, analogous to the .finalize_options() method of Command
          objects.
          """
          for attr in ('keywords', 'platforms'):
              value = getattr(self.metadata, attr)
              if value is None:
                  continue
              if isinstance(value, str):
                  value = [elm.strip() for elm in value.split(',')]
                  setattr(self.metadata, attr, value)
  
      def _show_help(self, parser, global_options=1, display_options=1,
          commands=[]):
          """Show help for the setup script command-line in the form of
          several lists of command-line options.  'parser' should be a
          FancyGetopt instance; do not expect it to be returned in the
          same state, as its option table will be reset to make it
          generate the correct help text.
  
          If 'global_options' is true, lists the global options:
          --verbose, --dry-run, etc.  If 'display_options' is true, lists
          the "display-only" options: --name, --version, etc.  Finally,
          lists per-command help for every command name or command class
          in 'commands'.
          """
          from distutils.core import gen_usage
          from distutils.cmd import Command
          if global_options:
              if display_options:
                  options = self._get_toplevel_options()
              else:
                  options = self.global_options
              parser.set_option_table(options)
              parser.print_help(self.common_usage + '\nGlobal options:')
              print('')
          if display_options:
              parser.set_option_table(self.display_options)
              parser.print_help('Information display options (just display ' +
                  'information, ignore any commands)')
              print('')
          for command in self.commands:
              if isinstance(command, type) and issubclass(command, Command):
                  klass = command
              else:
                  klass = self.get_command_class(command)
              if hasattr(klass, 'help_options') and isinstance(klass.
                  help_options, list):
                  parser.set_option_table(klass.user_options +
                      fix_help_options(klass.help_options))
              else:
                  parser.set_option_table(klass.user_options)
              parser.print_help("Options for '%s' command:" % klass.__name__)
              print('')
          print(gen_usage(self.script_name))
  
      def handle_display_options(self, option_order):
          """If there were any non-global "display-only" options
          (--help-commands or the metadata display options) on the command
          line, display the requested info and return true; else return
          false.
          """
          from distutils.core import gen_usage
          if self.help_commands:
              self.print_commands()
              print('')
              print(gen_usage(self.script_name))
              return 1
          any_display_options = 0
          is_display_option = {}
          for option in self.display_options:
              is_display_option[option[0]] = 1
          for opt, val in option_order:
              if val and is_display_option.get(opt):
                  opt = translate_longopt(opt)
                  value = getattr(self.metadata, 'get_' + opt)()
                  if opt in ['keywords', 'platforms']:
                      print(','.join(value))
                  elif opt in ('classifiers', 'provides', 'requires', 'obsoletes'
                      ):
                      print('\n'.join(value))
                  else:
                      print(value)
                  any_display_options = 1
          return any_display_options
  
      def print_command_list(self, commands, header, max_length):
          """Print a subset of the list of all commands -- used by
          'print_commands()'.
          """
          print(header + ':')
          for cmd in commands:
              klass = self.cmdclass.get(cmd)
              if not klass:
                  klass = self.get_command_class(cmd)
              try:
                  description = klass.description
              except AttributeError:
                  description = '(no description available)'
              print('  %-*s  %s' % (max_length, cmd, description))
  
      def print_commands(self):
          """Print out a help message listing all available commands with a
          description of each.  The list is divided into "standard commands"
          (listed in distutils.command.__all__) and "extra commands"
          (mentioned in self.cmdclass, but not a standard command).  The
          descriptions come from the command class attribute
          'description'.
          """
          import distutils.command
          std_commands = distutils.command.__all__
          is_std = {}
          for cmd in std_commands:
              is_std[cmd] = 1
          extra_commands = []
          for cmd in self.cmdclass.keys():
              if not is_std.get(cmd):
                  extra_commands.append(cmd)
          max_length = 0
          for cmd in (std_commands + extra_commands):
              if len(cmd) > max_length:
                  max_length = len(cmd)
          self.print_command_list(std_commands, 'Standard commands', max_length)
          if extra_commands:
              print()
              self.print_command_list(extra_commands, 'Extra commands',
                  max_length)
  
      def get_command_list(self):
          """Get a list of (command, description) tuples.
          The list is divided into "standard commands" (listed in
          distutils.command.__all__) and "extra commands" (mentioned in
          self.cmdclass, but not a standard command).  The descriptions come
          from the command class attribute 'description'.
          """
          import distutils.command
          std_commands = distutils.command.__all__
          is_std = {}
          for cmd in std_commands:
              is_std[cmd] = 1
          extra_commands = []
          for cmd in self.cmdclass.keys():
              if not is_std.get(cmd):
                  extra_commands.append(cmd)
          rv = []
          for cmd in (std_commands + extra_commands):
              klass = self.cmdclass.get(cmd)
              if not klass:
                  klass = self.get_command_class(cmd)
              try:
                  description = klass.description
              except AttributeError:
                  description = '(no description available)'
              rv.append((cmd, description))
          return rv
  
      def get_command_packages(self):
          """Return a list of packages from which commands are loaded."""
          pkgs = self.command_packages
          if not isinstance(pkgs, list):
              if pkgs is None:
                  pkgs = ''
              pkgs = [pkg.strip() for pkg in pkgs.split(',') if pkg != '']
              if 'distutils.command' not in pkgs:
                  pkgs.insert(0, 'distutils.command')
              self.command_packages = pkgs
          return pkgs
  
      def get_command_class(self, command):
          """Return the class that implements the Distutils command named by
          'command'.  First we check the 'cmdclass' dictionary; if the
          command is mentioned there, we fetch the class object from the
          dictionary and return it.  Otherwise we load the command module
          ("distutils.command." + command) and fetch the command class from
          the module.  The loaded class is also stored in 'cmdclass'
          to speed future calls to 'get_command_class()'.
  
          Raises DistutilsModuleError if the expected module could not be
          found, or if that module does not define the expected class.
          """
          klass = self.cmdclass.get(command)
          if klass:
              return klass
          for pkgname in self.get_command_packages():
              module_name = '%s.%s' % (pkgname, command)
              klass_name = command
              try:
                  __import__(module_name)
                  module = sys.modules[module_name]
              except ImportError:
                  continue
              try:
                  klass = getattr(module, klass_name)
              except AttributeError:
                  raise DistutilsModuleError(
                      "invalid command '%s' (no class '%s' in module '%s')" %
                      (command, klass_name, module_name))
              self.cmdclass[command] = klass
              return klass
          raise DistutilsModuleError("invalid command '%s'" % command)
  
      def get_command_obj(self, command, create=1):
          """Return the command object for 'command'.  Normally this object
          is cached on a previous call to 'get_command_obj()'; if no command
          object for 'command' is in the cache, then we either create and
          return it (if 'create' is true) or return None.
          """
          cmd_obj = self.command_obj.get(command)
          if not cmd_obj and create:
              if DEBUG:
                  self.announce(
                      "Distribution.get_command_obj(): creating '%s' command object"
                       % command)
              klass = self.get_command_class(command)
              cmd_obj = self.command_obj[command] = klass(self)
              self.have_run[command] = 0
              options = self.command_options.get(command)
              if options:
                  self._set_command_options(cmd_obj, options)
          return cmd_obj
  
      def _set_command_options(self, command_obj, option_dict=None):
          """Set the options for 'command_obj' from 'option_dict'.  Basically
          this means copying elements of a dictionary ('option_dict') to
          attributes of an instance ('command').
  
          'command_obj' must be a Command instance.  If 'option_dict' is not
          supplied, uses the standard option dictionary for this command
          (from 'self.command_options').
          """
          command_name = command_obj.get_command_name()
          if option_dict is None:
              option_dict = self.get_option_dict(command_name)
          if DEBUG:
              self.announce("  setting options for '%s' command:" % command_name)
          for option, (source, value) in option_dict.items():
              if DEBUG:
                  self.announce('    %s = %s (from %s)' % (option, value, source)
                      )
              try:
                  bool_opts = [translate_longopt(o) for o in command_obj.
                      boolean_options]
              except AttributeError:
                  bool_opts = []
              try:
                  neg_opt = command_obj.negative_opt
              except AttributeError:
                  neg_opt = {}
              try:
                  is_string = isinstance(value, str)
                  if option in neg_opt and is_string:
                      setattr(command_obj, neg_opt[option], not strtobool(value))
                  elif option in bool_opts and is_string:
                      setattr(command_obj, option, strtobool(value))
                  elif hasattr(command_obj, option):
                      setattr(command_obj, option, value)
                  else:
                      raise DistutilsOptionError(
                          "error in %s: command '%s' has no such option '%s'" %
                          (source, command_name, option))
              except ValueError as msg:
                  raise DistutilsOptionError(msg)
  
      def reinitialize_command(self, command, reinit_subcommands=0):
          """Reinitializes a command to the state it was in when first
          returned by 'get_command_obj()': ie., initialized but not yet
          finalized.  This provides the opportunity to sneak option
          values in programmatically, overriding or supplementing
          user-supplied values from the config files and command line.
          You'll have to re-finalize the command object (by calling
          'finalize_options()' or 'ensure_finalized()') before using it for
          real.
  
          'command' should be a command name (string) or command object.  If
          'reinit_subcommands' is true, also reinitializes the command's
          sub-commands, as declared by the 'sub_commands' class attribute (if
          it has one).  See the "install" command for an example.  Only
          reinitializes the sub-commands that actually matter, ie. those
          whose test predicates return true.
  
          Returns the reinitialized command object.
          """
          from distutils.cmd import Command
          if not isinstance(command, Command):
              command_name = command
              command = self.get_command_obj(command_name)
          else:
              command_name = command.get_command_name()
          if not command.finalized:
              return command
          command.initialize_options()
          command.finalized = 0
          self.have_run[command_name] = 0
          self._set_command_options(command)
          if reinit_subcommands:
              for sub in command.get_sub_commands():
                  self.reinitialize_command(sub, reinit_subcommands)
          return command
  
      def announce(self, msg, level=log.INFO):
          log.log(level, msg)
  
      def run_commands(self):
          """Run each command that was seen on the setup script command line.
          Uses the list of commands found and cache of command objects
          created by 'get_command_obj()'.
          """
          for cmd in self.commands:
              self.run_command(cmd)
  
      def run_command(self, command):
          """Do whatever it takes to run a command (including nothing at all,
          if the command has already been run).  Specifically: if we have
          already created and run the command named by 'command', return
          silently without doing anything.  If the command named by 'command'
          doesn't even have a command object yet, create one.  Then invoke
          'run()' on that command object (or an existing one).
          """
          if self.have_run.get(command):
              return
          log.info('running %s', command)
          cmd_obj = self.get_command_obj(command)
          cmd_obj.ensure_finalized()
          cmd_obj.run()
          self.have_run[command] = 1
  
      def has_pure_modules(self):
          return len(self.packages or self.py_modules or []) > 0
  
      def has_ext_modules(self):
          return self.ext_modules and len(self.ext_modules) > 0
  
      def has_c_libraries(self):
          return self.libraries and len(self.libraries) > 0
  
      def has_modules(self):
          return self.has_pure_modules() or self.has_ext_modules()
  
      def has_headers(self):
          return self.headers and len(self.headers) > 0
  
      def has_scripts(self):
          return self.scripts and len(self.scripts) > 0
  
      def has_data_files(self):
          return self.data_files and len(self.data_files) > 0
  
      def is_pure(self):
          return self.has_pure_modules() and not self.has_ext_modules(
              ) and not self.has_c_libraries()
  
  
  class DistributionMetadata:
      """Dummy class to hold the distribution meta-data: name, version,
      author, and so forth.
      """
      _METHOD_BASENAMES = ('name', 'version', 'author', 'author_email',
          'maintainer', 'maintainer_email', 'url', 'license', 'description',
          'long_description', 'keywords', 'platforms', 'fullname', 'contact',
          'contact_email', 'classifiers', 'download_url', 'provides',
          'requires', 'obsoletes')
  
      def __init__(self, path=None):
          if path is not None:
              self.read_pkg_file(open(path))
          else:
              self.name = None
              self.version = None
              self.author = None
              self.author_email = None
              self.maintainer = None
              self.maintainer_email = None
              self.url = None
              self.license = None
              self.description = None
              self.long_description = None
              self.keywords = None
              self.platforms = None
              self.classifiers = None
              self.download_url = None
              self.provides = None
              self.requires = None
              self.obsoletes = None
  
      def read_pkg_file(self, file):
          """Reads the metadata values from a file object."""
          msg = message_from_file(file)
  
          def _read_field(name):
              value = msg[name]
              if value == 'UNKNOWN':
                  return None
              return value
  
          def _read_list(name):
              values = msg.get_all(name, None)
              if values == []:
                  return None
              return values
          metadata_version = msg['metadata-version']
          self.name = _read_field('name')
          self.version = _read_field('version')
          self.description = _read_field('summary')
          self.author = _read_field('author')
          self.maintainer = None
          self.author_email = _read_field('author-email')
          self.maintainer_email = None
          self.url = _read_field('home-page')
          self.license = _read_field('license')
          if 'download-url' in msg:
              self.download_url = _read_field('download-url')
          else:
              self.download_url = None
          self.long_description = _read_field('description')
          self.description = _read_field('summary')
          if 'keywords' in msg:
              self.keywords = _read_field('keywords').split(',')
          self.platforms = _read_list('platform')
          self.classifiers = _read_list('classifier')
          if metadata_version == '1.1':
              self.requires = _read_list('requires')
              self.provides = _read_list('provides')
              self.obsoletes = _read_list('obsoletes')
          else:
              self.requires = None
              self.provides = None
              self.obsoletes = None
  
      def write_pkg_info(self, base_dir):
          """Write the PKG-INFO file into the release tree.
          """
          with open(os.path.join(base_dir, 'PKG-INFO'), 'w', encoding='UTF-8'
              ) as pkg_info:
              self.write_pkg_file(pkg_info)
  
      def write_pkg_file(self, file):
          """Write the PKG-INFO format data to a file object.
          """
          version = '1.0'
          if (self.provides or self.requires or self.obsoletes or self.
              classifiers or self.download_url):
              version = '1.1'
          file.write('Metadata-Version: %s\n' % version)
          file.write('Name: %s\n' % self.get_name())
          file.write('Version: %s\n' % self.get_version())
          file.write('Summary: %s\n' % self.get_description())
          file.write('Home-page: %s\n' % self.get_url())
          file.write('Author: %s\n' % self.get_contact())
          file.write('Author-email: %s\n' % self.get_contact_email())
          file.write('License: %s\n' % self.get_license())
          if self.download_url:
              file.write('Download-URL: %s\n' % self.download_url)
          long_desc = rfc822_escape(self.get_long_description())
          file.write('Description: %s\n' % long_desc)
          keywords = ','.join(self.get_keywords())
          if keywords:
              file.write('Keywords: %s\n' % keywords)
          self._write_list(file, 'Platform', self.get_platforms())
          self._write_list(file, 'Classifier', self.get_classifiers())
          self._write_list(file, 'Requires', self.get_requires())
          self._write_list(file, 'Provides', self.get_provides())
          self._write_list(file, 'Obsoletes', self.get_obsoletes())
  
      def _write_list(self, file, name, values):
          for value in values:
              file.write('%s: %s\n' % (name, value))
  
      def get_name(self):
          return self.name or 'UNKNOWN'
  
      def get_version(self):
          return self.version or '0.0.0'
  
      def get_fullname(self):
          return '%s-%s' % (self.get_name(), self.get_version())
  
      def get_author(self):
          return self.author or 'UNKNOWN'
  
      def get_author_email(self):
          return self.author_email or 'UNKNOWN'
  
      def get_maintainer(self):
          return self.maintainer or 'UNKNOWN'
  
      def get_maintainer_email(self):
          return self.maintainer_email or 'UNKNOWN'
  
      def get_contact(self):
          return self.maintainer or self.author or 'UNKNOWN'
  
      def get_contact_email(self):
          return self.maintainer_email or self.author_email or 'UNKNOWN'
  
      def get_url(self):
          return self.url or 'UNKNOWN'
  
      def get_license(self):
          return self.license or 'UNKNOWN'
      get_licence = get_license
  
      def get_description(self):
          return self.description or 'UNKNOWN'
  
      def get_long_description(self):
          return self.long_description or 'UNKNOWN'
  
      def get_keywords(self):
          return self.keywords or []
  
      def get_platforms(self):
          return self.platforms or ['UNKNOWN']
  
      def get_classifiers(self):
          return self.classifiers or []
  
      def get_download_url(self):
          return self.download_url or 'UNKNOWN'
  
      def get_requires(self):
          return self.requires or []
  
      def set_requires(self, value):
          import distutils.versionpredicate
          for v in value:
              distutils.versionpredicate.VersionPredicate(v)
          self.requires = value
  
      def get_provides(self):
          return self.provides or []
  
      def set_provides(self, value):
          value = [v.strip() for v in value]
          for v in value:
              import distutils.versionpredicate
              distutils.versionpredicate.split_provision(v)
          self.provides = value
  
      def get_obsoletes(self):
          return self.obsoletes or []
  
      def set_obsoletes(self, value):
          import distutils.versionpredicate
          for v in value:
              distutils.versionpredicate.VersionPredicate(v)
          self.obsoletes = value
  
  
  def fix_help_options(options):
      """Convert a 4-tuple 'help_options' list as found in various command
      classes to the 3-tuple form required by FancyGetopt.
      """
      new_options = []
      for help_tuple in options:
          new_options.append(help_tuple[0:3])
      return new_options
  