VirtualVandy

A simple wrapper around poetry with some basic shell integration

Installation

Install the package via pip:: sh

pip install virtualcandy

You'll need to perform a manual installation step to integrate Virtualcany with your shell. Virtualcany has utility command called vcpkgs that will help with this step. To get the shell snippet with a brief instruction run the command:: sh

vcpkgs install

That will give you instructions for your current shell environment. That's it, VirtualCandy is installed!

Philosophy of Virtualenv

My usage of Virtualenv_ is very similar to how one uses Git.

I create one Virtualenv_ environment per project and that Virtualenv_ environment is located at the top of the project's directory tree(in the same directory the .git directory would be). I also name all of my Virtualenv_ directories the same name, .venv, and this project uses that as the default Virtualenv_ directory name. But that is configurable.

Most VirtualCandy functions can be used from anywhere within a project using a Virtualenv_. VirtualCandy will find the nearest install of Virtualenv_ by traversing up the directory tree until one or no Virtualenv_ are found.

Configuration

Configuration is done via shell environemental variables. To change a configuration variable, set and export the variable in your .bashrc or .zshrc before virtualcandy is sourced.

Available config variables

• VC_VENV_INITIAL_PKGS
• PYTHON_ENV (Optional) If set to development, dev packages (if present) will be installed. Otherwise only default packages will be installed.
• VC_DEFAULT_VENV_NAME (Optional) Name of the Virtualenv directory, default is '.venv'
• VC_DEFAULT_VENV_REQFILE (Optional) Name of the requirements file, default is 'requirements.txt'
• VC_AUTO_ACTIVATION (Optional) Enable auto Virtualenv activation, default is true
• VC_PYTHON_EXE (Optional) Python executable to use for the Virtualenv, default is $(basename $(which python)) with a bias to Python 3.X
• VC_VIRTUALENV_EXE (Optional) Virtualenv command to use, default is virtualenv
• VC_CMD_INIT_ARGS
• VC_CMD_FREEZE_ARGS

Naming it:

Set the name of your Virtualenv_

VC_DEFAULT_VENV_NAME='.venv'

Auto activation:

The auto activation (when set to 'true', it's off by default) of a Virtualenv_ when you enter its containing directory. If you use Virtualenv_ often, this is a very handy option. Example: If you have a directory named ~/Dev1 that has a Virtualenv_ in it. Then upon changing into the ~/Dev1 directory that Virtualenv_ will be activated. If you a Virtualenv_ activated and cd into a directory containing a Virtualenv_ that is different from the currently activated Virtualenv_, then the current Virtualenv_ will be deactivated and the new one will be activated.

VC_AUTO_ACTIVATION=true

Shell Functions

vc init

Initialize a new virtualenv. This function only works on your current working directory(all other functions work anywhere within a Virtualenv project). If you run vcstart in a directory without a Virtualenv of the name defined by $VC_DEFAULT_VENV_NAME , then a new Virtualenv will be created. After the Virtualenv is created, if a requirements file is present, all of the packages listed in the requirements file will be installed. If a Virtualenv defined by the name $VC_DEFAULT_VENV_NAME already exists and a requirements file exists then no new Virtualenv will be created, the packages listed in a present requirements file will be installed/updated if necessary.

Any arguments given to the vcstart command will be considered package names and will be installed after the virtualenv is created. If package parameters are given and there is an existing requirements.txt file, the requirements.txt file we be updated to include the additional packages.

vc activate

vcactivate will activate the Virtualenv of the current project. vcactivate finds the current project by using the vcfindenv command.

vc freeze

Write a new requirements file for the current Virtualenv. The requirements file contents are the result of the pip freeze command. The requirements file is written in the same directory that contains the Virtualenv directory, even if the command is ran in a subdirectory. If you don't want to name the output file to be requirements.txt, you can change the name of the output file with the $VC_DEFAULT_VENV_REQFILE environmental variable.

vc clean

References

• Python_
• Virtualenv_
• Pip
• Poetry_

.. _Python: http://www.python.org/ .. _Virtualenv: http://www.virtualenv.org/en/latest/index.html .. _Poetry: https://python-poetry.org/ .. _Pip: http://pypi.python.org/pypi/pip