UpFast/shell.nix

{ pkgs ? (
    let
      inherit (builtins) fetchTree fromJSON readFile;
      inherit ((fromJSON (readFile ./flake.lock)).nodes) nixpkgs gomod2nix;
    in
    import (fetchTree nixpkgs.locked) {
      overlays = [
        (import "${fetchTree gomod2nix.locked}/overlay.nix")
      ];
    }
  )
, mkGoEnv ? pkgs.mkGoEnv
, gomod2nix ? pkgs.gomod2nix
, pre-commit-hooks
}:

let
  goEnv = mkGoEnv { pwd = ./.; };
  pre-commit-check = pre-commit-hooks.lib.${pkgs.system}.run {
      src = ./.;
      hooks = {
          gofmt.enable = true;
      };
  };
in
pkgs.mkShell {
  inherit (pre-commit-check) shellHook;
  packages = [
    goEnv
    gomod2nix
  ];
}