feat: allow arg pass through to nvd and nix-diff

Author: brianmcgee

docs/content/getting-started/nixos-configuration.md

@@ -139,6 +139,11 @@ Removed packages:
 Closure size: 562 -> 581 (55 paths added, 36 paths removed, delta +19, disk usage +700.6MiB).
 ```
 
+!!! info "Arg pass through"
+
+    Any additional arguments you provide to `nix run` after `--` will be passed through to the `nvd diff` command.
+    For example `nix run .#nixosConfigurations.basic.config.facter.debug.nvd -- --help`.
+
 ### `nix-diff`
 
 You can output a [nix-diff] of the system closure with and without `nixos-facter` enabled by running
@@ -180,6 +185,11 @@ You can output a [nix-diff] of the system closure with and without `nixos-facter
   ...
 ```
 
+!!! info "Arg pass through"
+
+    Any additional arguments you provide to `nix run` after `--` will be passed through to the `nix-diff` command.
+    For example `nix run .#nixosConfigurations.basic.config.facter.debug.nix-diff -- --help`.
+
 [NixOS configuration]: https://nixos.org/manual/nixos/stable/#sec-configuration-syntax
 [detected architecture]: https://github.com/numtide/nixos-facter-modules/blob/main/modules/nixos/system.nix
 [detected virtualisation]: https://github.com/numtide/nixos-facter-modules/blob/main/modules/nixos/virtualisation.nix

modules/nixos/debug.nix

@@ -54,7 +54,8 @@
       text = ''
         nvd diff \
                 ${config.system.build.noFacter.config.system.build.toplevel} \
-                ${config.system.build.toplevel}
+                ${config.system.build.toplevel} \
+                "$@"
       '';
     };
 
@@ -64,7 +65,8 @@
       text = ''
         nix-diff \
                 ${config.system.build.noFacter.config.system.build.toplevel} \
-                ${config.system.build.toplevel}
+                ${config.system.build.toplevel} \
+                "$@"
       '';
     };