anchor.diff:  
     programs.zsh.variables.cfg = "$HOME/.config/nixpkgs/darwin/configuration.nix";
     programs.zsh.variables.darwin = "$HOME/.nix-defexpr/darwin";
  -  programs.zsh.variables.pkgs = "$HOME/.nix-defexpr/nixpkgs";
  +  programs.zsh.variables.nixpkgs = "$HOME/.nix-defexpr/nixpkgs";
   
   
     programs.zsh.promptInit = ''
  
positive.code:   '';
  
    programs.zsh.loginShellInit = ''
      n() {
          nix-repl '<nixpkgs/lib>' ''${@:-<nixpkgs>}
      }
  
      hydra-job-revision() {
  
negative.code: 
    environment.variables.FZF_DEFAULT_COMMAND = "ag -l -f -g ''";
    environment.variables.SHELLCHECK_OPTS = "-e SC1008";
    environment.variables.LC_CTYPE = "UTF-8";
  
    environment.shellAliases.g = "git log --pretty=color -32";
    environment.shellAliases.gb = "git branch";
  