“““
If?setuptools?is?not?already?installed?in?the?environment?it‘s?not?possible
to?invoke?setuptools‘?own?commands.?This?routine?will?bootstrap?this?local
environment?by?creating?a?minimal?egg-info?directory?and?then?invoking?the
egg-info?command?to?flesh?out?the?egg-info?directory.
“““

from?__future__?import?unicode_literals

import?os
import?sys
import?textwrap
import?subprocess
import?io


minimal_egg_info?=?textwrap.dedent（“““
????[distutils.commands]
????egg_info?=?setuptools.command.egg_info:egg_info

????[distutils.setup_keywords]
????include_package_data?=?setuptools.dist:assert_bool
????install_requires?=?setuptools.dist:check_requirements
????extras_require?=?setuptools.dist:check_extras
????entry_points?=?setuptools.dist:check_entry_points

????[egg_info.writers]
????dependency_links.txt?=?setuptools.command.egg_info:overwrite_arg
????entry_points.txt?=?setuptools.command.egg_info:write_entries
????requires.txt?=?setuptools.command.egg_info:write_requirements
????“““）


def?ensure_egg_info（）:
????if?os.path.exists（‘setuptools.egg-info‘）:
????????return
????print（“adding?minimal?entry_points“）
????build_egg_info（）


def?build_egg_info（）:
????“““
????Build?a?minimal?egg-info?enough?to?invoke?egg_info
????“““

????os.mkdir（‘setuptools.egg-info‘）
????with?io.open（‘setuptools.egg-info/entry_points.txt‘?‘w‘）?as?ep:
????????ep.write（minimal_egg_info）


def?run_egg_info（）:
????cmd?=?[sys.executable?‘setup.py‘?‘egg_info‘]
????print（“Regenerating?egg_info“）
????subprocess.check_call（cmd）
????print（“...and?again.“）
????subprocess.check_call（cmd）


def?main（）:
????ensure_egg_info（）
????run_egg_info（）


__name__?==?‘__main__‘?and?main（）