flake.nix

{
  description = "Go kit application extensions";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        buildDeps = with pkgs; [ git go gnumake ];
        devDeps = with pkgs; buildDeps ++ [ golangci-lint gotestsum ];

        goShell = go:
          pkgs.mkShell {
            buildInputs = (pkgs.lib.remove pkgs.go devDeps) ++ [ go ];
          };
      in
      {
        devShell = pkgs.mkShell {
          buildInputs = devDeps;
        };

        devShells.go1_21 = goShell pkgs.go_1_21;
        devShells.go1_22 = goShell pkgs.go_1_22;
        devShells.go1_23 = goShell pkgs.go_1_23;
      });
}