[eadmund]

I recommend direnv for that: https://direnv.net/

Its intended use case is loading environment variables (you could use this to load your virtualenv), but it works by sourcing a script — and that script can be ‘cat usage.txt.’

Great tool.

If you use Emacs (and you should!), there’s a direnv mode. Emacs also has its own way to set configuration items within a directory (directory-local variables), and is smart enough to support two files, so that there can be one file checked into source control for all members of a project and another ignored for one’s personal config.