What's the problem this feature will solve?

pipx is a new tool which supports "global" installation of user tools. pip-tools seems like an ideal candidate for such a global tool. However, currently if you install pip-tools that way then anything that it installs (via pip-sync) goes into the pipx installation venv.

Describe the solution you'd like

I'd like to be able to install pip-tools once via pipx and then use this to sync my active virtualenv.

Alternative Solutions

The current alternative is to install pip-tools in each virtualenv but the downside is it then breaks pip freeze and requires updating for each virtualenv you might have on your system (pip install -U pip-tools).