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# -*- coding: utf-8 -*-
"""Activate venv for current interpreter:
Use `from vtk.web import venv` along one of the following
- `--venv /path/to/venv/base` argument
- environment variable `VTK_VENV=/path/to/venv/base`
This can be used when you must use an existing Python interpreter, not the venv bin/python.
"""
import os
import site
import sys
VENV_BASE = None
VENV_LOADED = False
if "--venv" in sys.argv:
VENV_BASE = os.path.abspath(sys.argv[sys.argv.index("--venv") + 1])
if os.environ.get("VTK_VENV"):
VENV_BASE = os.path.abspath(os.environ.get("VTK_VENV"))
if not VENV_LOADED and VENV_BASE and os.path.exists(VENV_BASE):
VENV_LOADED = True
# Code inspired by virutal-env::bin/active_this.py
bin_dir = os.path.join(VENV_BASE, "bin")
os.environ["PATH"] = os.pathsep.join([bin_dir] + os.environ.get("PATH", "").split(os.pathsep))
os.environ["VIRTUAL_ENV"] = VENV_BASE
prev_length = len(sys.path)
python_libs = os.path.join(VENV_BASE, f"lib/python{sys.version_info.major}.{sys.version_info.minor}/site-packages")
site.addsitedir(python_libs)
sys.path[:] = sys.path[prev_length:] + sys.path[0:prev_length]
sys.real_prefix = sys.prefix
sys.prefix = VENV_BASE
#
print(f"VTK is using venv: {VENV_BASE}")
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