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"""Activate virtualenv for current interpreter:
Use exec(open(this_file).read(), {'__file__': this_file}).
This can be used when you must use an existing Python interpreter, not the virtualenv bin/python.
"""
import os
import site
import sys
try:
__file__
except NameError:
raise AssertionError("You must use exec(open(this_file).read(), {'__file__': this_file}))")
# prepend bin to PATH (this file is inside the bin directory)
bin_dir = os.path.dirname(os.path.abspath(__file__))
os.environ["PATH"] = os.pathsep.join([bin_dir] + os.environ.get("PATH", "").split(os.pathsep))
base = os.path.dirname(bin_dir)
# virtual env is right above bin directory
os.environ["VIRTUAL_ENV"] = base
# add the virtual environments site-package to the host python import mechanism
IS_PYPY = hasattr(sys, "pypy_version_info")
IS_JYTHON = sys.platform.startswith("java")
if IS_JYTHON:
site_packages = os.path.join(base, "Lib", "site-packages")
elif IS_PYPY:
site_packages = os.path.join(base, "site-packages")
else:
IS_WIN = sys.platform == "win32"
if IS_WIN:
site_packages = os.path.join(base, "Lib", "site-packages")
else:
site_packages = os.path.join(base, "lib", "python{}".format(sys.version[:3]), "site-packages")
prev = set(sys.path)
site.addsitedir(site_packages)
sys.real_prefix = sys.prefix
sys.prefix = base
# Move the added items to the front of the path, in place
new = list(sys.path)
sys.path[:] = [i for i in new if i not in prev] + [i for i in new if i in prev]