I'm a big command line fan, but vi/emac/nano are not word processors. They're text editors. You might be able to get close if you are using them to edit Markdown and running it through Pandoc (especially if you add in a non-commandline PDF viewer). But still. WordPerfect 5.1 - now that was a curses/command line word processor :) I don't know of a modern equivalent though.
Most serious document production company (publishing companies and newspapers; legal firms are probably less sophisticated) have a similar pipeline within their firm. Text (raw or rigidly styled), version-controlled, running through a pipeline of reviews and signoffs and markup and arrangement.
> I don't know of a modern equivalent
I don't think monolithic word processors will be a feature of the future. The mainstream tool will be some kind of style editor. Maybe it'll incorporate a spellcheck and some other monolithic features. There'll be a pipeline underneath - to send things to paper or web or archive or accounts.We'll think much more in terms of snippets of styled data, and its lifecycle. We'll laugh at memories of these laborious monolithic word processing systems, and how we thought that this was productivity.