vim-heynumber is a plugin for the Vim editor.
It enables number and relativenumber inside buffers where I really need it and switches
its behaviour in insert (nu/nornu) and normal (nu/rnu) modes.
Additionally it disables (nonu/nornu) linenumbers inside empty buffers and enables them dynamically
as soon as the buffer isn't empty anymore.
If you don't use a plugin manager, I recommend to use vim-plug. Else I'm pretty sure you know how your personal plugin management works. ;)
Currently neither configuration options are available nor are any additional configuration steps to do. Simpy install the plugin and you should be good to go.
You are welcome to report bugs at the project bugtracker at github.com.