From 05446b111802d7848e1e7609d041eb7198fc7e84 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Tue, 27 Dec 2022 09:00:44 +0100
Subject: [PATCH] add default nix formatter and its corresponding Github action

---
 .github/workflows/nix-fmt-checks.yaml | 17 +++++++++++++++++
 flake.nix                             |  2 ++
 2 files changed, 19 insertions(+)
 create mode 100644 .github/workflows/nix-fmt-checks.yaml

diff --git a/.github/workflows/nix-fmt-checks.yaml b/.github/workflows/nix-fmt-checks.yaml
new file mode 100644
index 00000000..8f02591c
--- /dev/null
+++ b/.github/workflows/nix-fmt-checks.yaml
@@ -0,0 +1,17 @@
+name: Nix formatter checks
+
+on:
+  pull_request:
+
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v18
+
+      - name: Run nix formatter tool
+        run: nix fmt . -- --check
diff --git a/flake.nix b/flake.nix
index a5ecb1a5..bc591ace 100644
--- a/flake.nix
+++ b/flake.nix
@@ -28,6 +28,8 @@
           ];
         };
       in rec {
+        formatter = pkgs.alejandra;
+
         packages = {
           inherit (pkgs) php php56 php70 php71 php72 php73 php74 php80 php81 php82;
         };