Hooks for virtualenv-delete

[raffaem]

We should include hooks in pyenv-virtualenv-delete, like before_virtualenv_delete and after_virtualenv_delete.

For instance, pyenv-jupyter-kernel is a project that will create Jupyter kernels when creating a pyenv virtual environment, and delete the kernel when the virtual environment is deleted.

Kernel deletion works with pyenv uninstall, but not with pyenv virtualenv-delete, due to lack of hooks in this function.

Prerequisite

• [X] Make sure your problem is not listed in the common build problems.
• [X] Make sure no duplicated issue has already been reported in the pyenv-virtualenv issues. You should look in closed issues, too.
• [X] Make sure you are not asking us to help solving your specific issue.
  • GitHub issues is opened mainly for development purposes. If you want to ask someone to help solving your problem, go to some community site like Gitter, StackOverflow, etc.
• [X] Make sure your problem is not derived from packaging (e.g. Homebrew).
  • Please refer to the package documentation for the installation issues, etc.
• [X] Make sure your problem is not derived from other plugins.
  • This repository is maintaining the pyenv-virtualenv plugin only. Please refrain from reporting issues of other plugins here.

Description

• [ ] Platform information (e.g. Ubuntu Linux 20.04):
• [ ] OS architecture (e.g. amd64):
• [ ] pyenv version:
• [ ] pyenv-virtualenv version:
• [ ] Python version:
• [ ] virtualenv version (if installed):

• [ ] Please attach the debug log of a faulty Pyenv invocation as a gist

  • If the problem happens in a Pyenv invocation, you can turn on debug logging by setting PYENV_DEBUG=1, e.g. env PYENV_DEBUG=1 pyenv install -v 3.6.4

  • If the problem happens outside of a Pyenv invocation, get the debug log like this:

    # for Bash
    export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
    # for Zsh
    export PS4='+(%x:%I): %N(%i): '
    
    set -x
    <reproduce the problem>
    set +x

[native-api]

SGTM