Emerge completions

[JelteF]

Add some more advanced completions for the emerge command.

[zanchey]

Merged with rebase as 789a542..f920be5.

I must admit those completions look very slow; lots of forking with long pipelines. I don't use Gentoo so I can't comment but they might be a good target for optimisation.

[JelteF]

They weren't much slower than before, but they are quite slow in comparison to others. You can really feel it thinking when pressing tab. I think it takes close to a second. What takes longest I think is gathering all possible packages, but I'm not sure. I might look into optimizing it a bit in the future, I don't really care for it that much though. It's not something I auto complete that often, so I don't mind the one second delay that much.

[zanchey]

The other option would be copying the behaviour of __fish_print_packages and using a cache.

[JelteF]

Hmm, there's an application that sort of does that already to make searching through the packages faster. It might be possible to use it for this. It is called eix and as far as I know most Gentoo guys have it installed. It might be good to use that when available and use the current as a fallback.