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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
__init__.py	0 B	-rw-r--r--
_log.py	1015 B	-rw-r--r--
appdirs.py	1.63 KB	-rw-r--r--
compat.py	1.84 KB	-rw-r--r--
compatibility_tags.py	5.25 KB	-rw-r--r--
datetime.py	242 B	-rw-r--r--
deprecation.py	3.54 KB	-rw-r--r--
direct_url_helpers.py	3.13 KB	-rw-r--r--
distutils_args.py	1.22 KB	-rw-r--r--
egg_link.py	2.15 KB	-rw-r--r--
encoding.py	1.14 KB	-rw-r--r--
entrypoints.py	1.1 KB	-rw-r--r--
filesystem.py	5.75 KB	-rw-r--r--
filetypes.py	716 B	-rw-r--r--
glibc.py	3.04 KB	-rw-r--r--
hashes.py	4.7 KB	-rw-r--r--
inject_securetransport.py	795 B	-rw-r--r--
logging.py	11.26 KB	-rw-r--r--
misc.py	20.29 KB	-rw-r--r--
models.py	1.17 KB	-rw-r--r--
packaging.py	2.88 KB	-rw-r--r--
parallel.py	3.12 KB	-rw-r--r--
pkg_resources.py	987 B	-rw-r--r--
setuptools_build.py	4.59 KB	-rw-r--r--
subprocess.py	9.82 KB	-rw-r--r--
temp_dir.py	7.48 KB	-rw-r--r--
unpacking.py	8.94 KB	-rw-r--r--
urls.py	1.72 KB	-rw-r--r--
virtualenv.py	3.38 KB	-rw-r--r--
wheel.py	6.02 KB	-rw-r--r--

Code Editor : egg_link.py

# The following comment should be removed at some point in the future.
# mypy: strict-optional=False

import os
import re
import sys
from typing import Optional

from pip._internal.locations import site_packages, user_site
from pip._internal.utils.virtualenv import (
    running_under_virtualenv,
    virtualenv_no_global,
)

__all__ = [
    "egg_link_path_from_sys_path",
    "egg_link_path_from_location",
]

def _egg_link_name(raw_name: str) -> str:
    """
    Convert a Name metadata value to a .egg-link name, by applying
    the same substitution as pkg_resources's safe_name function.
    Note: we cannot use canonicalize_name because it has a different logic.
    """
    return re.sub("[^A-Za-z0-9.]+", "-", raw_name) + ".egg-link"

def egg_link_path_from_sys_path(raw_name: str) -> Optional[str]:
    """
    Look for a .egg-link file for project name, by walking sys.path.
    """
    egg_link_name = _egg_link_name(raw_name)
    for path_item in sys.path:
        egg_link = os.path.join(path_item, egg_link_name)
        if os.path.isfile(egg_link):
            return egg_link
    return None

def egg_link_path_from_location(raw_name: str) -> Optional[str]:
    """
    Return the path for the .egg-link file if it exists, otherwise, None.

There's 3 scenarios:
    1) not in a virtualenv
       try to find in site.USER_SITE, then site_packages
    2) in a no-global virtualenv
       try to find in site_packages
    3) in a yes-global virtualenv
       try to find in site_packages, then site.USER_SITE
       (don't look in global location)

For #1 and #3, there could be odd cases, where there's an egg-link in 2
    locations.

This method will just return the first one found.
    """
    sites = []
    if running_under_virtualenv():
        sites.append(site_packages)
        if not virtualenv_no_global() and user_site:
            sites.append(user_site)
    else:
        if user_site:
            sites.append(user_site)
        sites.append(site_packages)

egg_link_name = _egg_link_name(raw_name)
    for site in sites:
        egglink = os.path.join(site, egg_link_name)
        if os.path.isfile(egglink):
            return egglink
    return None

${this.title}

Code Editor : egg_link.py