pipenv calcate virtualenv name

pipenv_virtualenv_calc.py

# https://github.com/pypa/pipenv/issues/1049
# https://github.com/pypa/pipenv/blob/a4aca53b5d02a4168214a487714d9836c9415a0c/pipenv/project.py#L116
# How pipenv calc virtualenv name in `~/.local/share/virtualenvs/`

import os, re, base64, hashlib
def virtualenv_name(path):
    sanitized = re.sub(r'[ $`!*@"\\\r\n\t]', '_', os.path.basename(path))[0:42]
    hash = hashlib.sha256((path+'/Pipfile').encode()).digest()[:6]
    encoded_hash = base64.urlsafe_b64encode(hash).decode()
    return sanitized + '-' + encoded_hash

# >>> virtualenv_name('/home/chen/haibss')
# 'haibss-9rO3TUH9'

# $ ls -lh ~/.local/share/virtualenvs/
# drwxrwxr-x 5 chen chen 4.0K Nov 28 00:24 haibss-9rO3TUH9