Clang format in the CI

Signed-off-by: Mateusz Mazur <mateusz.mazur@e.email>

.clang-format

@@ -5,7 +5,7 @@ AccessModifierOffset: -2
 AlignAfterOpenBracket: Align
 AlignArrayOfStructures: None
 AlignConsecutiveAssignments:
-  Enabled:         true
+  Enabled: true
   AcrossEmptyLines: false
   AcrossComments:  false
   AlignCompound:   false
@@ -26,7 +26,7 @@ AlignConsecutiveDeclarations:
   AlignFunctionPointers: false
   PadOperators:    false
 AlignConsecutiveMacros:
-  Enabled:         false
+  Enabled: false
   AcrossEmptyLines: false
   AcrossComments:  false
   AlignCompound:   false

.github/workflows/clang-format.yml

@@ -0,0 +1,23 @@
+name: Clang formatting checker
+
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: silkeh/clang # https://hub.docker.com/r/silkeh/clang
+    env:
+      DRY: "TRUE"
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Checking formatting
+        run: DRY=TRUE bash reformat-all.sh

reformat-all.sh

@@ -1,3 +1,14 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
-find . -name '*.cpp' -o -name '*.hpp' | xargs clang-format -i -style=file
+ALL_FORMATABLE_FILES=$(find src include tests example -name '*.cpp' -o -name '*.hpp')
+CLANG_FORMAT_ARGS="-style=file"
+
+echo "*** Modbus Clang Format Wrapper **"
+clang-format --version
+
+if [[ "$DRY" = "TRUE" ]]; then
+    diff_count=`clang-format --dry-run $CLANG_FORMAT_ARGS $ALL_FORMATABLE_FILES 2>&1 | wc -l`
+    exit $(($diff_count > 0))
+else
+    clang-format -i --verbose $CLANG_FORMAT_ARGS $ALL_FORMATABLE_FILES
+fi