bundlerUpdateScript: gemset.nix should be formatted via nixfmt

[amesgen]

Describe the bug

gemset.nix as created by bundlerUpdateScript is not formatted by nixfmt, which seems a bit inconvenient.

Steps To Reproduce

Run the update script for any package using bundlerUpdateScript, e.g.

nix-shell maintainers/scripts/update.nix --argstr package cbor-diag

and observe that the resulting gemset.nix is not formatted.

Expected behavior

It should be formatted.

I see at least the following two ways to do this:

• Just do this in the update script here, i.e. like this:

  Diff

  diff --git a/pkgs/development/ruby-modules/bundler-update-script/default.nix b/pkgs/development/ruby-modules/bundler-update-script/default.nix
  index 037aeef4a0e7..2135e42a2279 100644
  --- a/pkgs/development/ruby-modules/bundler-update-script/default.nix
  +++ b/pkgs/development/ruby-modules/bundler-update-script/default.nix
  @@ -7,6 +7,7 @@
     coreutils,
     git,
     nix,
  +  nixfmt-rfc-style,
   }:
   
   attrPath:
  @@ -21,6 +22,7 @@ let
           coreutils
           git
           nix
  +        nixfmt-rfc-style
         ]
       }
       set -o errexit
  @@ -39,6 +41,7 @@ let
       export BUNDLE_FORCE_RUBY_PLATFORM=1
       bundler lock --update
       bundix
  +    nixfmt gemset.nix
     '';
   in
   [

  Happy to open a PR for this.

• Add this functionality to bundix.

Notify maintainers

@manveru @zimbatm as bundix maintainers

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[zimbatm]

Sounds good. Both are useful but feel free to send a PR for the update script as a start.

[amesgen]

#369120