add tgs-to-gif support

nixos/module.nix

@@ -11,6 +11,20 @@ with pkgs.lib;
       type = types.package;
       default = import ../default.nix { inherit pkgs; };
     };
+    tgs-to-gif-package = mkOption {
+      type = types.package;
+      default =
+        let
+          clansty-flake = pkgs.fetchFromGitHub {
+            owner = "Clansty";
+            repo = "flake";
+            rev = "d602b0359456457b8d92d1f84e42e7aec3baa9be";
+            fetchSubmodules = true;
+            sha256 = "na+HvJ7B/rP+qew1b58hTkHzc6BRvOERUHgva7cEY5k=";
+          };
+        in
+        pkgs.callPackage "${clansty-flake}/packages/tgs-to-gif" { };
+    };
     tg.api-id = mkOption {
       type = types.int;
     };

nixos/service.nix

@@ -18,7 +18,7 @@ in
     };
 
     systemd.services.q2tg = {
-      description = "Q2TG checkin";
+      description = "Q2TG service";
       path = [ cfg.package ];
       wantedBy = [ "multi-user.target" ];
       after = [ "network.target" ];
@@ -35,6 +35,7 @@ in
         PRISMA_QUERY_ENGINE_LIBRARY = "${pkgs.prisma-engines}/lib/libquery_engine.node";
         PRISMA_INTROSPECTION_ENGINE_BINARY = "${pkgs.prisma-engines}/bin/introspection-engine";
         PRISMA_FMT_BINARY = "${pkgs.prisma-engines}/bin/prisma-fmt";
+        TGS_TO_GIF = "${cfg.tgs-to-gif-package}/bin/tgs-to-gif";
       };
       serviceConfig = {
         User = "q2tg";

src/encoding/tgsToGif.ts

@@ -2,7 +2,7 @@ import { spawn } from 'child_process';
 
 export default function tgsToGif(tgsPath: string) {
   return new Promise(resolve => {
-    spawn('tgs_to_gif', [tgsPath]).on('exit', () => {
+    spawn(process.env.TGS_TO_GIF || 'tgs_to_gif', [tgsPath]).on('exit', () => {
       resolve(tgsPath + '.gif');
     });
   });