Enabling tokyonight triggers a startup error

[dongcarl]

Plugin affected: tokyonight

Description

Trying to build nixvim as a flake just to try it out, the default config with just the colorscheme set to tokyonight prints an error:

Error detected while processing /nix/store/mg2k27nxv61p40ld55hw9zd2kz23gqm2-init.lua:
E5113: Error while calling lua chunk: /nix/store/mg2k27nxv61p40ld55hw9zd2kz23gqm2-init.lua:17: Vim(colorscheme):E5113
: Error while calling lua chunk: ...imPackages/start/tokyonight.nvim/lua/tokyonight/util.lua:50: attempt to call meth
od 'lower' (a nil value)
stack traceback:
        ...imPackages/start/tokyonight.nvim/lua/tokyonight/util.lua:50: in function 'highlight'
        ...imPackages/start/tokyonight.nvim/lua/tokyonight/util.lua:95: in function 'syntax'
        ...imPackages/start/tokyonight.nvim/lua/tokyonight/util.lua:165: in function 'load'
        ...imPackages/start/tokyonight.nvim/lua/tokyonight/init.lua:12: in function 'load'
        ...mplugin-tokyonight.nvim-2022-09-07/colors/tokyonight.lua:1: in main chunk
        [C]: in function 'cmd'
        /nix/store/mg2k27nxv61p40ld55hw9zd2kz23gqm2-init.lua:17: in main chunk
stack traceback:
        [C]: in function 'cmd'
        /nix/store/mg2k27nxv61p40ld55hw9zd2kz23gqm2-init.lua:17: in main chunk

This is reproducible on both my macOS and Linux systems

Config

{
  description = "A very basic flake";

  inputs.nixvim.url = "github:pta2002/nixvim";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = {
    self,
    nixpkgs,
    nixvim,
    flake-utils,
  }: let
    config = {
      colorschemes.tokyonight.enable = true;
    };
  in
    flake-utils.lib.eachDefaultSystem (system: let
	  nixvim' = nixvim.legacyPackages."${system}";
      nvim = nixvim'.makeNixvim config;
    in {
      packages = {
        inherit nvim;
        default = nvim;
      };
    });
}

[traxys]

Arf it seems I was not thorough enough when overhauling the tokyonight configuration.

You need to have a more recent tokyonight than what is available with the locked nixpkgs of nixvim.

You can do this by changing your inputs with the following:

{
  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
  inputs.nixvim = {
    url = "github:pta2002/nixvim";
    inputs.nixpkgs.follows = "nixpkgs";
  };
}

PS: I believe it works with changing 'nixpkgs-unstable' to '22.11' for stable packages.

[pta2002]

Ah, this looks like an upstream issue with tokyonight, will see what I can do about it.