I tried to use this to get better completions with nushell, but it just doesn't have the breadth and depth of completions that fish has as of yet, nor does it have automatic completion generation from manages (although it does have a tool for that) so I eventually gave up and just made fish itself my nushell's completion engine. However I'll be keeping my eye on it, because it's a really cool idea to have a shared completion engine for all shells, so that everyone can pool their work, and because of course having to install two entire shells just to use one of them is a bit silly so eventually I'd like to make the switch.
The completions don't work sometimes (for instance you don't get completion for some commands when running them with sudo) and it doesn't fall back on providing file completions if it doesn't know what other completions to provide, which is a bit annoying, but it generally works and I'm sure there are ways to fix that too.
