nix: pass through exec arguments

This is useful for when a wrapper script is unnecessary.

Signed-off-by: Ophestra <cat@gensokyo.uk>

nixos.nix

@@ -88,11 +88,15 @@ in
 
                   conf = {
                     inherit (app) id;
-                    path = pkgs.writeScript "${app.name}-start" ''
+                    path =
+                      if app.path == null then
+                        pkgs.writeScript "${app.name}-start" ''
                           #!${pkgs.zsh}${pkgs.zsh.shellPath}
                           ${script}
-                    '';
-                    args = [ "${app.name}-start" ];
+                        ''
+                      else
+                        app.path;
+                    args = if app.args == null then [ "${app.name}-start" ] else app.args;
 
                     confinement = {
                       app_id = aid;

options.nix

@@ -94,6 +94,24 @@ in
                 '';
               };
 
+              path = mkOption {
+                type = nullOr str;
+                default = null;
+                description = ''
+                  Custom executable path.
+                  Setting this to null will default to the start script.
+                '';
+              };
+
+              args = mkOption {
+                type = nullOr (listOf str);
+                default = null;
+                description = ''
+                  Custom args.
+                  Setting this to null will default to script name.
+                '';
+              };
+
               script = mkOption {
                 type = nullOr str;
                 default = null;