text: # -*- coding=utf-8 -*-
  """A compatibility module for pipenv's backports and manipulations.
  
  Exposes a standard API that enables compatibility across python versions,
  operating systems, etc.
  """
  import functools
  import importlib
  import io
  import os
  import six
  import sys
  import warnings
  from tempfile import _bin_openflags, gettempdir, _mkstemp_inner, mkdtemp
  from .utils import (logging, rmtree)
  
  try:
      from tempfile import _infer_return_type
  except ImportError:
  
      def _infer_return_type(*args):
          _types = set()
          for arg in args:
              if isinstance(type(arg), six.string_types):
                  _types.add(str)
              elif isinstance(type(arg), bytes):
                  _types.add(bytes)
              elif arg:
                  _types.add(type(arg))
          return _types.pop()
  
  if sys.version_info[:2] >= (3, 5):
      try:
          from pathlib import Path
      except ImportError:
          from .vendor.pathlib2 import Path
  else:
      from .vendor.pathlib2 import Path
  
  # Backport required for earlier versions of Python.
  if sys.version_info < (3, 3):
      from .vendor.backports.shutil_get_terminal_size import get_terminal_size
  else:
      from shutil import get_terminal_size
  
  try:
      from weakref import finalize
  except ImportError:
      try:
          from .vendor.backports.weakref import finalize
      except ImportError:
  
          class finalize(object):
  
              def __init__(self, *args, **kwargs):
                  logging.warn("weakref.finalize unavailable, not cleaning...")
  
              def detach(self):
                  return False
  
  
  if six.PY2:
  
      class ResourceWarning(Warning):
          pass
  
  
  def pip_import(module_path, subimport=None, old_path=None):
      internal = 'pip._internal.{0}'.format(module_path)
      old_path = old_path or module_path
      pip9 = 'pip.{0}'.format(old_path)
      try:
          _tmp = importlib.import_module(internal)
      except ImportError:
          _tmp = importlib.import_module(pip9)
      if subimport:
          return getattr(_tmp, subimport, _tmp)
      return _tmp
  
  
  class TemporaryDirectory(object):
      """Create and return a temporary directory.  This has the same
      behavior as mkdtemp but can be used as a context manager.  For
      example:
  
          with TemporaryDirectory() as tmpdir:
              ...
  
      Upon exiting the context, the directory and everything contained
      in it are removed.
      """
  
      def __init__(self, suffix, prefix, dir=None):
          if "RAM_DISK" in os.environ:
              import uuid
  
              name = uuid.uuid4().hex
              dir_name = os.path.join(os.environ["RAM_DISK"].strip(), name)
              os.mkdir(dir_name)
              self.name = dir_name
          else:
              self.name = mkdtemp(suffix, prefix, dir)
          self._finalizer = finalize(
              self,
              self._cleanup,
              self.name,
              warn_message="Implicitly cleaning up {!r}".format(self),
          )
  
      @classmethod
      def _cleanup(cls, name, warn_message):
          rmtree(name)
          warnings.warn(warn_message, ResourceWarning)
  
      def __repr__(self):
          return "<{} {!r}>".format(self.__class__.__name__, self.name)
  
      def __enter__(self):
          return self
  
      def __exit__(self, exc, value, tb):
          self.cleanup()
  
      def cleanup(self):
          if self._finalizer.detach():
              rmtree(self.name)
  
  
  def _sanitize_params(prefix, suffix, dir):
      """Common parameter processing for most APIs in this module."""
      output_type = _infer_return_type(prefix, suffix, dir)
      if suffix is None:
          suffix = output_type()
      if prefix is None:
          if output_type is str:
              prefix = "tmp"
          else:
              prefix = os.fsencode("tmp")
      if dir is None:
          if output_type is str:
              dir = gettempdir()
          else:
              dir = os.fsencode(gettempdir())
      return prefix, suffix, dir, output_type
  
  
  class _TemporaryFileCloser:
      """A separate object allowing proper closing of a temporary file's
      underlying file object, without adding a __del__ method to the
      temporary file."""
      file = None  # Set here since __del__ checks it
      close_called = False
  
      def __init__(self, file, name, delete=True):
          self.file = file
          self.name = name
          self.delete = delete
  
      # NT provides delete-on-close as a primitive, so we don't need
      # the wrapper to do anything special.  We still use it so that
      # file.name is useful (i.e. not "(fdopen)") with NamedTemporaryFile.
      if os.name != "nt":
  
          # Cache the unlinker so we don't get spurious errors at
          # shutdown when the module-level "os" is None'd out.  Note
          # that this must be referenced as self.unlink, because the
          # name TemporaryFileWrapper may also get None'd out before
          # __del__ is called.
  
          def close(self, unlink=os.unlink):
              if not self.close_called and self.file is not None:
                  self.close_called = True
                  try:
                      self.file.close()
                  finally:
                      if self.delete:
                          unlink(self.name)
  
          # Need to ensure the file is deleted on __del__
  
          def __del__(self):
              self.close()
  
      else:
  
          def close(self):
              if not self.close_called:
                  self.close_called = True
                  self.file.close()
  
  
  class _TemporaryFileWrapper:
      """Temporary file wrapper
      This class provides a wrapper around files opened for
      temporary use.  In particular, it seeks to automatically
      remove the file when it is no longer needed.
      """
  
      def __init__(self, file, name, delete=True):
          self.file = file
          self.name = name
          self.delete = delete
          self._closer = _TemporaryFileCloser(file, name, delete)
  
      def __getattr__(self, name):
          # Attribute lookups are delegated to the underlying file
          # and cached for non-numeric results
          # (i.e. methods are cached, closed and friends are not)
          file = self.__dict__["file"]
          a = getattr(file, name)
          if hasattr(a, "__call__"):
              func = a
  
              @functools.wraps(func)
              def func_wrapper(*args, **kwargs):
                  return func(*args, **kwargs)
  
              # Avoid closing the file as long as the wrapper is alive,
              # see issue #18879.
              func_wrapper._closer = self._closer
              a = func_wrapper
          if not isinstance(a, int):
              setattr(self, name, a)
          return a
  
      # The underlying __enter__ method returns the wrong object
      # (self.file) so override it to return the wrapper
  
      def __enter__(self):
          self.file.__enter__()
          return self
  
      # Need to trap __exit__ as well to ensure the file gets
      # deleted when used in a with statement
  
      def __exit__(self, exc, value, tb):
          result = self.file.__exit__(exc, value, tb)
          self.close()
          return result
  
      def close(self):
          """
          Close the temporary file, possibly deleting it.
          """
          self._closer.close()
  
      # iter() doesn't use __getattr__ to find the __iter__ method
  
      def __iter__(self):
          # Don't return iter(self.file), but yield from it to avoid closing
          # file as long as it's being used as iterator (see issue #23700).  We
          # can't use 'yield from' here because iter(file) returns the file
          # object itself, which has a close method, and thus the file would get
          # closed when the generator is finalized, due to PEP380 semantics.
          for line in self.file:
              yield line
  
  
  def NamedTemporaryFile(
      mode="w+b",
      buffering=-1,
      encoding=None,
      newline=None,
      suffix=None,
      prefix=None,
      dir=None,
      delete=True,
  ):
      """Create and return a temporary file.
      Arguments:
      'prefix', 'suffix', 'dir' -- as for mkstemp.
      'mode' -- the mode argument to io.open (default "w+b").
      'buffering' -- the buffer size argument to io.open (default -1).
      'encoding' -- the encoding argument to io.open (default None)
      'newline' -- the newline argument to io.open (default None)
      'delete' -- whether the file is deleted on close (default True).
      The file is created as mkstemp() would do it.
      Returns an object with a file-like interface; the name of the file
      is accessible as its 'name' attribute.  The file will be automatically
      deleted when it is closed unless the 'delete' argument is set to False.
      """
      prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)
      flags = _bin_openflags
      # Setting O_TEMPORARY in the flags causes the OS to delete
      # the file when it is closed.  This is only supported by Windows.
      if os.name == "nt" and delete:
          flags |= os.O_TEMPORARY
      if sys.version_info < (3, 5):
          (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
      else:
          (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags, output_type)
      try:
          file = io.open(
              fd, mode, buffering=buffering, newline=newline, encoding=encoding,
          )
          return _TemporaryFileWrapper(file, name, delete)
  
      except BaseException:
          os.unlink(name)
          os.close(fd)
          raise
  