--- a/lib/python3.8/site-packages/pip/_internal/req/req_uninstall.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,644 +0,0 @@
-from __future__ import absolute_import
-
-import csv
-import functools
-import logging
-import os
-import sys
-import sysconfig
-
-from pip._vendor import pkg_resources
-
-from pip._internal.exceptions import UninstallationError
-from pip._internal.locations import bin_py, bin_user
-from pip._internal.utils.compat import WINDOWS, cache_from_source, uses_pycache
-from pip._internal.utils.logging import indent_log
-from pip._internal.utils.misc import (
-    FakeFile,
-    ask,
-    dist_in_usersite,
-    dist_is_local,
-    egg_link_path,
-    is_local,
-    normalize_path,
-    renames,
-    rmtree,
-)
-from pip._internal.utils.temp_dir import AdjacentTempDirectory, TempDirectory
-from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:
-    from typing import (
-        Any, Callable, Dict, Iterable, Iterator, List, Optional, Set, Tuple,
-    )
-    from pip._vendor.pkg_resources import Distribution
-
-logger = logging.getLogger(__name__)
-
-
-def _script_names(dist, script_name, is_gui):
-    # type: (Distribution, str, bool) -> List[str]
-    """Create the fully qualified name of the files created by
-    {console,gui}_scripts for the given ``dist``.
-    Returns the list of file names
-    """
-    if dist_in_usersite(dist):
-        bin_dir = bin_user
-    else:
-        bin_dir = bin_py
-    exe_name = os.path.join(bin_dir, script_name)
-    paths_to_remove = [exe_name]
-    if WINDOWS:
-        paths_to_remove.append(exe_name + '.exe')
-        paths_to_remove.append(exe_name + '.exe.manifest')
-        if is_gui:
-            paths_to_remove.append(exe_name + '-script.pyw')
-        else:
-            paths_to_remove.append(exe_name + '-script.py')
-    return paths_to_remove
-
-
-def _unique(fn):
-    # type: (Callable[..., Iterator[Any]]) -> Callable[..., Iterator[Any]]
-    @functools.wraps(fn)
-    def unique(*args, **kw):
-        # type: (Any, Any) -> Iterator[Any]
-        seen = set()  # type: Set[Any]
-        for item in fn(*args, **kw):
-            if item not in seen:
-                seen.add(item)
-                yield item
-    return unique
-
-
-@_unique
-def uninstallation_paths(dist):
-    # type: (Distribution) -> Iterator[str]
-    """
-    Yield all the uninstallation paths for dist based on RECORD-without-.py[co]
-
-    Yield paths to all the files in RECORD. For each .py file in RECORD, add
-    the .pyc and .pyo in the same directory.
-
-    UninstallPathSet.add() takes care of the __pycache__ .py[co].
-    """
-    r = csv.reader(FakeFile(dist.get_metadata_lines('RECORD')))
-    for row in r:
-        path = os.path.join(dist.location, row[0])
-        yield path
-        if path.endswith('.py'):
-            dn, fn = os.path.split(path)
-            base = fn[:-3]
-            path = os.path.join(dn, base + '.pyc')
-            yield path
-            path = os.path.join(dn, base + '.pyo')
-            yield path
-
-
-def compact(paths):
-    # type: (Iterable[str]) -> Set[str]
-    """Compact a path set to contain the minimal number of paths
-    necessary to contain all paths in the set. If /a/path/ and
-    /a/path/to/a/file.txt are both in the set, leave only the
-    shorter path."""
-
-    sep = os.path.sep
-    short_paths = set()  # type: Set[str]
-    for path in sorted(paths, key=len):
-        should_skip = any(
-            path.startswith(shortpath.rstrip("*")) and
-            path[len(shortpath.rstrip("*").rstrip(sep))] == sep
-            for shortpath in short_paths
-        )
-        if not should_skip:
-            short_paths.add(path)
-    return short_paths
-
-
-def compress_for_rename(paths):
-    # type: (Iterable[str]) -> Set[str]
-    """Returns a set containing the paths that need to be renamed.
-
-    This set may include directories when the original sequence of paths
-    included every file on disk.
-    """
-    case_map = dict((os.path.normcase(p), p) for p in paths)
-    remaining = set(case_map)
-    unchecked = sorted(set(os.path.split(p)[0]
-                           for p in case_map.values()), key=len)
-    wildcards = set()  # type: Set[str]
-
-    def norm_join(*a):
-        # type: (str) -> str
-        return os.path.normcase(os.path.join(*a))
-
-    for root in unchecked:
-        if any(os.path.normcase(root).startswith(w)
-               for w in wildcards):
-            # This directory has already been handled.
-            continue
-
-        all_files = set()  # type: Set[str]
-        all_subdirs = set()  # type: Set[str]
-        for dirname, subdirs, files in os.walk(root):
-            all_subdirs.update(norm_join(root, dirname, d)
-                               for d in subdirs)
-            all_files.update(norm_join(root, dirname, f)
-                             for f in files)
-        # If all the files we found are in our remaining set of files to
-        # remove, then remove them from the latter set and add a wildcard
-        # for the directory.
-        if not (all_files - remaining):
-            remaining.difference_update(all_files)
-            wildcards.add(root + os.sep)
-
-    return set(map(case_map.__getitem__, remaining)) | wildcards
-
-
-def compress_for_output_listing(paths):
-    # type: (Iterable[str]) -> Tuple[Set[str], Set[str]]
-    """Returns a tuple of 2 sets of which paths to display to user
-
-    The first set contains paths that would be deleted. Files of a package
-    are not added and the top-level directory of the package has a '*' added
-    at the end - to signify that all it's contents are removed.
-
-    The second set contains files that would have been skipped in the above
-    folders.
-    """
-
-    will_remove = set(paths)
-    will_skip = set()
-
-    # Determine folders and files
-    folders = set()
-    files = set()
-    for path in will_remove:
-        if path.endswith(".pyc"):
-            continue
-        if path.endswith("__init__.py") or ".dist-info" in path:
-            folders.add(os.path.dirname(path))
-        files.add(path)
-
-    # probably this one https://github.com/python/mypy/issues/390
-    _normcased_files = set(map(os.path.normcase, files))  # type: ignore
-
-    folders = compact(folders)
-
-    # This walks the tree using os.walk to not miss extra folders
-    # that might get added.
-    for folder in folders:
-        for dirpath, _, dirfiles in os.walk(folder):
-            for fname in dirfiles:
-                if fname.endswith(".pyc"):
-                    continue
-
-                file_ = os.path.join(dirpath, fname)
-                if (os.path.isfile(file_) and
-                        os.path.normcase(file_) not in _normcased_files):
-                    # We are skipping this file. Add it to the set.
-                    will_skip.add(file_)
-
-    will_remove = files | {
-        os.path.join(folder, "*") for folder in folders
-    }
-
-    return will_remove, will_skip
-
-
-class StashedUninstallPathSet(object):
-    """A set of file rename operations to stash files while
-    tentatively uninstalling them."""
-    def __init__(self):
-        # type: () -> None
-        # Mapping from source file root to [Adjacent]TempDirectory
-        # for files under that directory.
-        self._save_dirs = {}  # type: Dict[str, TempDirectory]
-        # (old path, new path) tuples for each move that may need
-        # to be undone.
-        self._moves = []  # type: List[Tuple[str, str]]
-
-    def _get_directory_stash(self, path):
-        # type: (str) -> str
-        """Stashes a directory.
-
-        Directories are stashed adjacent to their original location if
-        possible, or else moved/copied into the user's temp dir."""
-
-        try:
-            save_dir = AdjacentTempDirectory(path)  # type: TempDirectory
-        except OSError:
-            save_dir = TempDirectory(kind="uninstall")
-        self._save_dirs[os.path.normcase(path)] = save_dir
-
-        return save_dir.path
-
-    def _get_file_stash(self, path):
-        # type: (str) -> str
-        """Stashes a file.
-
-        If no root has been provided, one will be created for the directory
-        in the user's temp directory."""
-        path = os.path.normcase(path)
-        head, old_head = os.path.dirname(path), None
-        save_dir = None
-
-        while head != old_head:
-            try:
-                save_dir = self._save_dirs[head]
-                break
-            except KeyError:
-                pass
-            head, old_head = os.path.dirname(head), head
-        else:
-            # Did not find any suitable root
-            head = os.path.dirname(path)
-            save_dir = TempDirectory(kind='uninstall')
-            self._save_dirs[head] = save_dir
-
-        relpath = os.path.relpath(path, head)
-        if relpath and relpath != os.path.curdir:
-            return os.path.join(save_dir.path, relpath)
-        return save_dir.path
-
-    def stash(self, path):
-        # type: (str) -> str
-        """Stashes the directory or file and returns its new location.
-        Handle symlinks as files to avoid modifying the symlink targets.
-        """
-        path_is_dir = os.path.isdir(path) and not os.path.islink(path)
-        if path_is_dir:
-            new_path = self._get_directory_stash(path)
-        else:
-            new_path = self._get_file_stash(path)
-
-        self._moves.append((path, new_path))
-        if (path_is_dir and os.path.isdir(new_path)):
-            # If we're moving a directory, we need to
-            # remove the destination first or else it will be
-            # moved to inside the existing directory.
-            # We just created new_path ourselves, so it will
-            # be removable.
-            os.rmdir(new_path)
-        renames(path, new_path)
-        return new_path
-
-    def commit(self):
-        # type: () -> None
-        """Commits the uninstall by removing stashed files."""
-        for _, save_dir in self._save_dirs.items():
-            save_dir.cleanup()
-        self._moves = []
-        self._save_dirs = {}
-
-    def rollback(self):
-        # type: () -> None
-        """Undoes the uninstall by moving stashed files back."""
-        for p in self._moves:
-            logger.info("Moving to %s\n from %s", *p)
-
-        for new_path, path in self._moves:
-            try:
-                logger.debug('Replacing %s from %s', new_path, path)
-                if os.path.isfile(new_path) or os.path.islink(new_path):
-                    os.unlink(new_path)
-                elif os.path.isdir(new_path):
-                    rmtree(new_path)
-                renames(path, new_path)
-            except OSError as ex:
-                logger.error("Failed to restore %s", new_path)
-                logger.debug("Exception: %s", ex)
-
-        self.commit()
-
-    @property
-    def can_rollback(self):
-        # type: () -> bool
-        return bool(self._moves)
-
-
-class UninstallPathSet(object):
-    """A set of file paths to be removed in the uninstallation of a
-    requirement."""
-    def __init__(self, dist):
-        # type: (Distribution) -> None
-        self.paths = set()  # type: Set[str]
-        self._refuse = set()  # type: Set[str]
-        self.pth = {}  # type: Dict[str, UninstallPthEntries]
-        self.dist = dist
-        self._moved_paths = StashedUninstallPathSet()
-
-    def _permitted(self, path):
-        # type: (str) -> bool
-        """
-        Return True if the given path is one we are permitted to
-        remove/modify, False otherwise.
-
-        """
-        return is_local(path)
-
-    def add(self, path):
-        # type: (str) -> None
-        head, tail = os.path.split(path)
-
-        # we normalize the head to resolve parent directory symlinks, but not
-        # the tail, since we only want to uninstall symlinks, not their targets
-        path = os.path.join(normalize_path(head), os.path.normcase(tail))
-
-        if not os.path.exists(path):
-            return
-        if self._permitted(path):
-            self.paths.add(path)
-        else:
-            self._refuse.add(path)
-
-        # __pycache__ files can show up after 'installed-files.txt' is created,
-        # due to imports
-        if os.path.splitext(path)[1] == '.py' and uses_pycache:
-            self.add(cache_from_source(path))
-
-    def add_pth(self, pth_file, entry):
-        # type: (str, str) -> None
-        pth_file = normalize_path(pth_file)
-        if self._permitted(pth_file):
-            if pth_file not in self.pth:
-                self.pth[pth_file] = UninstallPthEntries(pth_file)
-            self.pth[pth_file].add(entry)
-        else:
-            self._refuse.add(pth_file)
-
-    def remove(self, auto_confirm=False, verbose=False):
-        # type: (bool, bool) -> None
-        """Remove paths in ``self.paths`` with confirmation (unless
-        ``auto_confirm`` is True)."""
-
-        if not self.paths:
-            logger.info(
-                "Can't uninstall '%s'. No files were found to uninstall.",
-                self.dist.project_name,
-            )
-            return
-
-        dist_name_version = (
-            self.dist.project_name + "-" + self.dist.version
-        )
-        logger.info('Uninstalling %s:', dist_name_version)
-
-        with indent_log():
-            if auto_confirm or self._allowed_to_proceed(verbose):
-                moved = self._moved_paths
-
-                for_rename = compress_for_rename(self.paths)
-
-                for path in sorted(compact(for_rename)):
-                    moved.stash(path)
-                    logger.debug('Removing file or directory %s', path)
-
-                for pth in self.pth.values():
-                    pth.remove()
-
-                logger.info('Successfully uninstalled %s', dist_name_version)
-
-    def _allowed_to_proceed(self, verbose):
-        # type: (bool) -> bool
-        """Display which files would be deleted and prompt for confirmation
-        """
-
-        def _display(msg, paths):
-            # type: (str, Iterable[str]) -> None
-            if not paths:
-                return
-
-            logger.info(msg)
-            with indent_log():
-                for path in sorted(compact(paths)):
-                    logger.info(path)
-
-        if not verbose:
-            will_remove, will_skip = compress_for_output_listing(self.paths)
-        else:
-            # In verbose mode, display all the files that are going to be
-            # deleted.
-            will_remove = set(self.paths)
-            will_skip = set()
-
-        _display('Would remove:', will_remove)
-        _display('Would not remove (might be manually added):', will_skip)
-        _display('Would not remove (outside of prefix):', self._refuse)
-        if verbose:
-            _display('Will actually move:', compress_for_rename(self.paths))
-
-        return ask('Proceed (y/n)? ', ('y', 'n')) == 'y'
-
-    def rollback(self):
-        # type: () -> None
-        """Rollback the changes previously made by remove()."""
-        if not self._moved_paths.can_rollback:
-            logger.error(
-                "Can't roll back %s; was not uninstalled",
-                self.dist.project_name,
-            )
-            return
-        logger.info('Rolling back uninstall of %s', self.dist.project_name)
-        self._moved_paths.rollback()
-        for pth in self.pth.values():
-            pth.rollback()
-
-    def commit(self):
-        # type: () -> None
-        """Remove temporary save dir: rollback will no longer be possible."""
-        self._moved_paths.commit()
-
-    @classmethod
-    def from_dist(cls, dist):
-        # type: (Distribution) -> UninstallPathSet
-        dist_path = normalize_path(dist.location)
-        if not dist_is_local(dist):
-            logger.info(
-                "Not uninstalling %s at %s, outside environment %s",
-                dist.key,
-                dist_path,
-                sys.prefix,
-            )
-            return cls(dist)
-
-        if dist_path in {p for p in {sysconfig.get_path("stdlib"),
-                                     sysconfig.get_path("platstdlib")}
-                         if p}:
-            logger.info(
-                "Not uninstalling %s at %s, as it is in the standard library.",
-                dist.key,
-                dist_path,
-            )
-            return cls(dist)
-
-        paths_to_remove = cls(dist)
-        develop_egg_link = egg_link_path(dist)
-        develop_egg_link_egg_info = '{}.egg-info'.format(
-            pkg_resources.to_filename(dist.project_name))
-        egg_info_exists = dist.egg_info and os.path.exists(dist.egg_info)
-        # Special case for distutils installed package
-        distutils_egg_info = getattr(dist._provider, 'path', None)
-
-        # Uninstall cases order do matter as in the case of 2 installs of the
-        # same package, pip needs to uninstall the currently detected version
-        if (egg_info_exists and dist.egg_info.endswith('.egg-info') and
-                not dist.egg_info.endswith(develop_egg_link_egg_info)):
-            # if dist.egg_info.endswith(develop_egg_link_egg_info), we
-            # are in fact in the develop_egg_link case
-            paths_to_remove.add(dist.egg_info)
-            if dist.has_metadata('installed-files.txt'):
-                for installed_file in dist.get_metadata(
-                        'installed-files.txt').splitlines():
-                    path = os.path.normpath(
-                        os.path.join(dist.egg_info, installed_file)
-                    )
-                    paths_to_remove.add(path)
-            # FIXME: need a test for this elif block
-            # occurs with --single-version-externally-managed/--record outside
-            # of pip
-            elif dist.has_metadata('top_level.txt'):
-                if dist.has_metadata('namespace_packages.txt'):
-                    namespaces = dist.get_metadata('namespace_packages.txt')
-                else:
-                    namespaces = []
-                for top_level_pkg in [
-                        p for p
-                        in dist.get_metadata('top_level.txt').splitlines()
-                        if p and p not in namespaces]:
-                    path = os.path.join(dist.location, top_level_pkg)
-                    paths_to_remove.add(path)
-                    paths_to_remove.add(path + '.py')
-                    paths_to_remove.add(path + '.pyc')
-                    paths_to_remove.add(path + '.pyo')
-
-        elif distutils_egg_info:
-            raise UninstallationError(
-                "Cannot uninstall {!r}. It is a distutils installed project "
-                "and thus we cannot accurately determine which files belong "
-                "to it which would lead to only a partial uninstall.".format(
-                    dist.project_name,
-                )
-            )
-
-        elif dist.location.endswith('.egg'):
-            # package installed by easy_install
-            # We cannot match on dist.egg_name because it can slightly vary
-            # i.e. setuptools-0.6c11-py2.6.egg vs setuptools-0.6rc11-py2.6.egg
-            paths_to_remove.add(dist.location)
-            easy_install_egg = os.path.split(dist.location)[1]
-            easy_install_pth = os.path.join(os.path.dirname(dist.location),
-                                            'easy-install.pth')
-            paths_to_remove.add_pth(easy_install_pth, './' + easy_install_egg)
-
-        elif egg_info_exists and dist.egg_info.endswith('.dist-info'):
-            for path in uninstallation_paths(dist):
-                paths_to_remove.add(path)
-
-        elif develop_egg_link:
-            # develop egg
-            with open(develop_egg_link, 'r') as fh:
-                link_pointer = os.path.normcase(fh.readline().strip())
-            assert (link_pointer == dist.location), (
-                'Egg-link %s does not match installed location of %s '
-                '(at %s)' % (link_pointer, dist.project_name, dist.location)
-            )
-            paths_to_remove.add(develop_egg_link)
-            easy_install_pth = os.path.join(os.path.dirname(develop_egg_link),
-                                            'easy-install.pth')
-            paths_to_remove.add_pth(easy_install_pth, dist.location)
-
-        else:
-            logger.debug(
-                'Not sure how to uninstall: %s - Check: %s',
-                dist, dist.location,
-            )
-
-        # find distutils scripts= scripts
-        if dist.has_metadata('scripts') and dist.metadata_isdir('scripts'):
-            for script in dist.metadata_listdir('scripts'):
-                if dist_in_usersite(dist):
-                    bin_dir = bin_user
-                else:
-                    bin_dir = bin_py
-                paths_to_remove.add(os.path.join(bin_dir, script))
-                if WINDOWS:
-                    paths_to_remove.add(os.path.join(bin_dir, script) + '.bat')
-
-        # find console_scripts
-        _scripts_to_remove = []
-        console_scripts = dist.get_entry_map(group='console_scripts')
-        for name in console_scripts.keys():
-            _scripts_to_remove.extend(_script_names(dist, name, False))
-        # find gui_scripts
-        gui_scripts = dist.get_entry_map(group='gui_scripts')
-        for name in gui_scripts.keys():
-            _scripts_to_remove.extend(_script_names(dist, name, True))
-
-        for s in _scripts_to_remove:
-            paths_to_remove.add(s)
-
-        return paths_to_remove
-
-
-class UninstallPthEntries(object):
-    def __init__(self, pth_file):
-        # type: (str) -> None
-        if not os.path.isfile(pth_file):
-            raise UninstallationError(
-                "Cannot remove entries from nonexistent file %s" % pth_file
-            )
-        self.file = pth_file
-        self.entries = set()  # type: Set[str]
-        self._saved_lines = None  # type: Optional[List[bytes]]
-
-    def add(self, entry):
-        # type: (str) -> None
-        entry = os.path.normcase(entry)
-        # On Windows, os.path.normcase converts the entry to use
-        # backslashes.  This is correct for entries that describe absolute
-        # paths outside of site-packages, but all the others use forward
-        # slashes.
-        # os.path.splitdrive is used instead of os.path.isabs because isabs
-        # treats non-absolute paths with drive letter markings like c:foo\bar
-        # as absolute paths. It also does not recognize UNC paths if they don't
-        # have more than "\\sever\share". Valid examples: "\\server\share\" or
-        # "\\server\share\folder". Python 2.7.8+ support UNC in splitdrive.
-        if WINDOWS and not os.path.splitdrive(entry)[0]:
-            entry = entry.replace('\\', '/')
-        self.entries.add(entry)
-
-    def remove(self):
-        # type: () -> None
-        logger.debug('Removing pth entries from %s:', self.file)
-        with open(self.file, 'rb') as fh:
-            # windows uses '\r\n' with py3k, but uses '\n' with py2.x
-            lines = fh.readlines()
-            self._saved_lines = lines
-        if any(b'\r\n' in line for line in lines):
-            endline = '\r\n'
-        else:
-            endline = '\n'
-        # handle missing trailing newline
-        if lines and not lines[-1].endswith(endline.encode("utf-8")):
-            lines[-1] = lines[-1] + endline.encode("utf-8")
-        for entry in self.entries:
-            try:
-                logger.debug('Removing entry: %s', entry)
-                lines.remove((entry + endline).encode("utf-8"))
-            except ValueError:
-                pass
-        with open(self.file, 'wb') as fh:
-            fh.writelines(lines)
-
-    def rollback(self):
-        # type: () -> bool
-        if self._saved_lines is None:
-            logger.error(
-                'Cannot roll back changes to %s, none were made', self.file
-            )
-            return False
-        logger.debug('Rolling %s back to previous state', self.file)
-        with open(self.file, 'wb') as fh:
-            fh.writelines(self._saved_lines)
-        return True