nix-darwin's configuration directory differs from Nixpkgs

[Freed-Wu]

In nix-darwin:

Configuration lives in ~/.nixpkgs/darwin-configuration.nix

In nix-pkgs:

A user’s nixpkgs configuration is stored in a user-specific configuration file located at ~/.config/nixpkgs/config.nix. For example:

Why nix-darwin's config is not ~/.config/nixpkgs?

[Freed-Wu]

Default is defined at https://github.com/LnL7/nix-darwin/blob/master/modules/environment/default.nix#L71. Any thought to change it?

[Enzime]

The plan is to change the default directory to /etc/nix-darwin as nix-darwin configures the entire system not just a singular user

nix-darwin is separate to Nixpkgs and should not live in its configuration directory

See #1203