snoo2nebby/flake.nix

{
  description = "Reddit -> Discord replicator";

  inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
  inputs.utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, utils }:
    utils.lib.eachSystem [ "x86_64-linux" "aarch64-linux" ] (system:
      let
        pkgs = nixpkgs.legacyPackages."${system}";
        version = builtins.substring 0 8 self.lastModifiedDate;
      in {
        packages.snoo2nebby = pkgs.buildGoModule {
          pname = "rhea";
          inherit version;
          src = ./.;
          vendorSha256 = null;
        };

        defaultPackage = self.packages.${system}.snoo2nebby;

        devShell = with pkgs;
          mkShell { buildInputs = [ go gopls gotools bashInteractive ]; };

        nixosModule = { config, lib, pkgs, ... }:
          let cfg = config.within.services.snoo2nebby;
          in with lib; {
            options.within.services.snoo2nebby = {
              enable = mkEnableOption
                "enables snoo2nebby for crossposting from reddit to Discord";
              subreddit = mkOption {
                type = types.str;
                default = "tulpas";
                description =
                  "the subreddit name to monitor (the foo of /r/foo)";
              };
            };

            config = mkIf cfg.enable {
              users.groups.within = mkDefault {};
              users.users.snoo2nebby = {
                createHome = true;
                description = "tulpa.dev/cadey/snoo2nebby";
                isSystemUser = true;
                group = "within";
                home = "/srv/within/snoo2nebby";
              };

              systemd.services.snoo2nebby = {
                wantedBy = [ "multi-user.target" ];
                after = [ "snoo2nebby-key.service" ];
                wants = [ "snoo2nebby-key.service" ];

                unitConfig.ConditionPathExists = "/srv/within/snoo2nebby/whurl.txt";

                serviceConfig = {
                  User = "snoo2nebby";
                  Group = "within";
                  Restart = "on-failure";
                  WorkingDirectory = "/srv/within/snoo2nebby";
                  RestartSec = "30s";
                };

                script = let pkg = self.defaultPackage.${system};
                in ''
                  exec ${pkg}/bin/snoo2nebby -webhook-file /srv/within/snoo2nebby/whurl.txt -subreddit "${cfg.subreddit}"
                '';
              };
            };
          };
      });
}