From 2b6297c075242a4f95c82698772d80d4559d8e42 Mon Sep 17 00:00:00 2001
From: Simon Cruanes <simon.cruanes.2007@m4x.org>
Date: Tue, 20 Jan 2026 20:49:24 -0500
Subject: [PATCH] CI: check format

---
 .github/workflows/format.yml | 28 ++++++++++++++++++++++++++++
 .ocamlformat                 |  2 +-
 Makefile                     |  6 ++++++
 3 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/format.yml

diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
new file mode 100644
index 0000000..acbf3d1
--- /dev/null
+++ b/.github/workflows/format.yml
@@ -0,0 +1,28 @@
+name: format
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  format:
+    name: format
+    strategy:
+      matrix:
+        ocaml-compiler:
+            - '5.3'
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: actions/checkout@main
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+          dune-cache: true
+          allow-prerelease-opam: true
+
+      - run: opam install ocamlformat.0.27.0
+      - run: opam exec -- make format-check
+
diff --git a/.ocamlformat b/.ocamlformat
index 7818345..f33f722 100644
--- a/.ocamlformat
+++ b/.ocamlformat
@@ -1,4 +1,4 @@
-version = 0.26.2
+version = 0.27.0
 profile=conventional
 margin=80
 if-then-else=k-r
diff --git a/Makefile b/Makefile
index f60c62e..e50a206 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,12 @@ test-autopromote:
 clean:
 	@dune clean
 
+format:
+	@dune build $(DUNE_OPTS) @fmt --auto-promote
+
+format-check:
+	@dune build $(DUNE_OPTS) @fmt --display=quiet
+
 doc:
 	@dune build @doc