"""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:
abs_file = os.path.abspath(__file__)
except NameError:
raise AssertionError("You must use exec(open(this_file).read(), {'__file__': this_file}))")
bin_dir = os.path.dirname(abs_file)
base = bin_dir[: -len("__BIN_NAME__") - 1] # strip away the bin part from the __file__, plus the path separator
# prepend bin to PATH (this file is inside the bin directory)
os.environ["PATH"] = os.pathsep.join([bin_dir] + os.environ.get("PATH", "").split(os.pathsep))
os.environ["VIRTUAL_ENV"] = base # virtual env is right above bin directory
# add the virtual environments libraries to the host python import mechanism
prev_length = len(sys.path)
for lib in "__LIB_FOLDERS__".split(os.pathsep):
path = os.path.realpath(os.path.join(bin_dir, lib))
site.addsitedir(path.decode("utf-8") if "__DECODE_PATH__" else path)
sys.path[:] = sys.path[prev_length:] + sys.path[0:prev_length]
sys.real_prefix = sys.prefix
sys.prefix = base
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