From b4823cd2489ed5337db4b26db57af72b3e6eae8d Mon Sep 17 00:00:00 2001
From: ryoppippi <1560508+ryoppippi@users.noreply.github.com>
Date: Thu, 22 Jan 2026 10:51:07 +0000
Subject: [PATCH] fix(nix): replace deprecated nixfmt-rfc-style with nixfmt

nixfmt-rfc-style is now the same as pkgs.nixfmt and should be used
instead. This removes the explicit package override in treefmt and
updates devShells to use the standard nixfmt package.

- Remove nixfmt.package override in treefmt config (defaults to nixfmt)
- Replace nixfmt-rfc-style with nixfmt in devShells.default
- Update nix-workflow.md documentation to reflect the change
---
 .claude/rules/nix-workflow.md | 2 +-
 flake.nix                     | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/.claude/rules/nix-workflow.md b/.claude/rules/nix-workflow.md
index c9234ac..a4fdfd8 100644
--- a/.claude/rules/nix-workflow.md
+++ b/.claude/rules/nix-workflow.md
@@ -16,7 +16,7 @@ devShells.default = pkgs.mkShellNoCC {
     uv
     ty
     just
-    nixfmt-rfc-style
+    nixfmt
 
     # your new tool here
     new-tool
diff --git a/flake.nix b/flake.nix
index f5faee7..4819ad9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,7 +39,6 @@
             projectRootFile = "flake.nix";
             programs = {
               nixfmt.enable = true;
-              nixfmt.package = pkgs.nixfmt-rfc-style;
               ruff-check.enable = true;
               ruff-format.enable = true;
             };
@@ -94,7 +93,7 @@
               uv
               ty
               just
-              nixfmt-rfc-style
+              nixfmt
 
               # security
               gitleaks