Background
Direnv is a utility to load and unload environment variables automatically as you navigate in and out of directories. It can also hook into pyenv to load and unload virtual environments.
Global config for direnv exists in ~/.config/direnv. This is where you put the additional pyenv commands.
You need to create a .envrc file in the project root which you want to trigger the virtualenv activation. E.g.:
It works by checking for the existence of a .envrc or .env file in the current or parent directories. If the file exists and is authorized then it's loaded into a bash subshell, and all exported variables are then captured by direnv and made available to the current shell.
It can also hook into pyenv to load and unload virtual environments.
Direnv is fast enough to be unnoticeable on each prompt, because its compiled into a single static executable. It is language agnostic.
Config
Global config for direnv exists in ~/.config/direnv. This is where you put the additional pyenv commands.
The project's wiki contains instructions for setting up direnv with pyenv, pyenv-virtualenv and other python tools, and tools for other languages
You need to create a .envrc file in the project root which you want to trigger the virtualenv activation. E.g.:
pyversion=3.10.0
pvenv=blog
use python ${pyversion}
layout virtualenv ${pyversion} ${pvenv}
layout activate ${pvenv}