nix-gitea-themes/module.nix

{ config, pkgs, lib, ... }:
let
  cfg = config.services.gitea-themes.monokai;
  giteaCfg = config.services.gitea;
in
{
  options.services.gitea-themes.monokai = {
    enable = lib.mkEnableOption "monokai theme for gitea";
    package = lib.mkPackageOption pkgs "gitea-theme-monokai" { };
  };

  config = lib.mkIf (cfg.enable && giteaCfg.enable)  {
    services.gitea.settings.ui.THEMES = lib.strings.concatStringsSep "," [
      "gitea"
      "arc-green"
      "monokai"
    ];

    systemd.services.install-gitea-theme-monokai = {
      wantedBy = [ "gitea.service" ];
      requiredBy = [ "gitea.service" ];

      serviceConfig =  {
        Type = "oneshot";
        User = giteaCfg.user;
        Group = giteaCfg.group;
      };
      script = ''
        mkdir -p "${giteaCfg.customDir}/public/assets/css"
        if ! [ -f "${giteaCfg.customDir}/public/assets/css/theme-monokai.css" ]; then
          ln -s "${cfg.package}/share/gitea/public/assets/css/theme-monokai.css" "${giteaCfg.customDir}/public/assets/css/theme-monokai.css"
          ln -s "${cfg.package}/share/gitea/public/css/theme-monokai.css" "${giteaCfg.customDir}/public/css/theme-monokai.css"
        fi
      '';
    };
  };
}