Apple Silicon: Smoother integration

[bphenriques]

Had to manually remove IntelliJ and Docker from Homebrew.

Most likely need to review if some packages can now be fetched from nixpkgs and not from Homebrew.

• [ ] Override system in nix darwin
• [ ] Have different nixpkgs for x86-64 packages that are not compatible in apple silicon

[bphenriques]

Also use pkgs.stdenv.hostPlatform.isAarch64 to check

[bphenriques]

Reference:

• https://github.com/nix-dot-dev/nix.dev/issues/178
• https://github.com/LnL7/nix-darwin/pull/317/files

[bphenriques]

How to override some packages:

      x86-packages = final: prev: (optionalAttrs (prev.stdenv.system == "aarch64-darwin") {
        inherit (final.pkgs-x86);
        # google-cloud-sdk
        # ngrok;
      });
      apple-silicon = final: prev: optionalAttrs (prev.stdenv.system == "aarch64-darwin") {
        # Add access to x86 packages system is running Apple Silicon
        pkgs-x86 = import inputs.nixpkgs-unstable {
          system = "x86_64-darwin";
          inherit (nixpkgsConfig) config;
        };
      };

[bphenriques]

Not sure if this is actually needed:

          nix.extraOptions = ''
            auto-optimise-store = true
            experimental-features = nix-command flakes
          '' + lib.optionalString (pkgs.system == "aarch64-darwin") ''
            extra-platforms = x86_64-darwin aarch64-darwin
          '';

Reason: I think I saw a PR/commit where the extra-platforms is set automatically on nix-darwin.

[bphenriques]

This might be needed to setup Rosetta on macos:

$ /usr/sbin/softwareupdate --install-rosetta --agree-to-license

[bphenriques]

CPU=$(uname -p)
if [[ "$CPU" == "arm" ]]; then
    eval $(/opt/homebrew/bin/brew shellenv)
else
    eval $(/opt/homebrew/bin/brew shellenv)
    eval $(/usr/local/bin/brew shellenv)
fi