nh darwin: implement

[Guanran928]

nh os switch currently does not work for nix-darwin.

[viperML]

nh os is a nixos-rebuild rewrite, doesn't have anything to do with nix-darwin

[SolidRhino]

This would be a great addition!

[viperML]

I don't use macos, so I don't think I'll ever implement this

[ToyVo]

I heard about this project a couple days ago, and I decided to take a shot at updating for darwin, I'll make a PR once I'm done for comment, but for reference I'm looking at the darwin-rebuild command https://github.com/LnL7/nix-darwin/blob/master/pkgs/nix-tools/darwin-rebuild.sh

This line that builds flake#nixosConfiguration.hostname.config.system.build.toplevel needs to be switched to flake#darwinConfiguration.hostname.config.system.build.toplevel

Then this line that runs switch-to-configuration, that script doesn't exist on darwin but darwin rebuild runs activate-user then activate within it's result directory

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Edit: I am maintaining this fork because viper doesn't want to have the code https://github.com/ToyVo/nh