def to_io(fa: 'TmuxIO[A]', tmux: Tmux) -> Do:
result = yield IO.delay(fa.run, tmux)
yield IO.from_either(result.to_either)
def virtualenv_interpreter(venv: str, executable: str) -> Do:
path_s = yield IO.from_either(env.get('PATH'))
path = Lists.split(path_s, ':')
clean_path = path.filter_not(lambda a: a.startswith(venv))
candidate = yield IO.delay(shutil.which, executable, path=clean_path.mk_string(':'))
return Path(candidate)
