From 5d6bbabd2302be2754bbaf41aaf362f8eeb3ac4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Sun, 17 Nov 2024 18:24:20 +0100
Subject: [PATCH] add treefmt

---
 flake.nix     | 11 +++++++++++
 formatter.nix | 27 +++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 formatter.nix

diff --git a/flake.nix b/flake.nix
index b389c09..57a5056 100644
--- a/flake.nix
+++ b/flake.nix
@@ -95,6 +95,10 @@
           in
           {
             home-manager = self.legacyPackages.${system}.homeConfigurations.sops.activation-script;
+            treefmt =
+              (pkgs.callPackage ./formatter.nix {
+                inputs = privateInputs;
+              }).config.build.check;
           }
           // (suffix-stable packages-stable)
           // nixpkgs.lib.optionalAttrs pkgs.stdenv.isLinux tests
@@ -131,6 +135,13 @@
           }
         );
 
+        formatter = eachSystem (
+          { pkgs, ... }:
+          (pkgs.callPackage ./formatter.nix {
+            inputs = privateInputs;
+          }).config.build.wrapper
+        );
+
         apps = eachSystem (
           { pkgs, ... }:
           {
diff --git a/formatter.nix b/formatter.nix
new file mode 100644
index 0000000..ae1bd3a
--- /dev/null
+++ b/formatter.nix
@@ -0,0 +1,27 @@
+{ pkgs, inputs, ... }:
+inputs.treefmt-nix.lib.evalModule pkgs {
+  projectRootFile = ".git/config";
+
+  programs = {
+    nixfmt.enable = true;
+
+    deadnix.enable = true;
+    deno.enable = true;
+  };
+
+  settings = {
+    global.excludes = [
+      "./pkgs/sops-install-secrets/test-assets/*"
+      "*.narHash"
+      # unsupported extensions
+      "*.{asc,pub,gpg}"
+      "*/secrets.{bin,json,ini,yaml}"
+    ];
+
+    formatter = {
+      deadnix = {
+        priority = 1;
+      };
+    };
+  };
+}