WP CLI theme install. Install a private repo?

I actually figured out a way to do this. First you use wget like this:

wget --user username --ask-password -O path/to/output.zip https://bitbucket.org/path/to/file.zip

the -O flag specifies output and output.zip is where you want it to download to.

Then you can run:

wp theme install path/to/output.zip --activate

Happy days