[Nix-dev] Configuring vim with override

[Nikita Karetnikov]

I'd like to enable cscope and clipboard support in vim by editing only the
configuration.nix file.  If I understand the NixOS manual correctly, it should
look like this:

environment.systemPackages = [ (pkgs.emacs.override { gtk = pkgs.gtk3; }) ];

https://nixos.org/nixos/manual/index.html#sec-customising-packages

So I've tried something similar:

environment.systemPackages.pkgs =
  [ ...
    (vimNox.override {
       cscopeSupport = true;
       clipboardSupport = true;
    })
    ...
  ]

I use vimNox here since nox shows it as vim_configurable, which is defined like
this:

https://github.com/NixOS/nixpkgs/blob/e2f7744f80e444c3e7b8680854de31fdc5c81543/pkgs/applications/editors/vim/configurable.nix#L148

This doesn't work, however.  I've also tried using vim, vimHugeX,
vim_configurable with various solutions from GitHub:

https://github.com/NixOS/nixpkgs/search?utf8=%E2%9C%93&q=override+filename%3Aconfiguration.nix+language%3Anix

No luck, though.  What's the right way?