Polybar
Getting started
You can copy the example configation from /nix/store/<hash>-polybar-<version>/share/doc/polybar/examples/config.ini
to ~/.config/polybar/config.ini
and launch with polybar -c ~/.config/polybar/config.ini example
This default configuration requires the icon font 'siji' which can be installed as documented on [Fonts]
Configuration
See the upstream docs for further configuration options