ci: lint cpp source

.github/workflows/lint.yml

@@ -0,0 +1,15 @@
+name: lint
+
+on: [push]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Lint Cpp source
+        run: |
+          sudo apt-get -y install clang-format
+          bash lint-c.sh

README.rst

@@ -2,7 +2,7 @@
 Beginning Arduino with PlatformIO
 =================================
 
-|docs-status| |build-status|
+|docs-status| |build-status| |lint-status|
 
 
 Beginner's Arduino projects for the `PlatformIO`_ IDE.
@@ -37,3 +37,6 @@ License
 .. |build-status| image:: https://github.com/sethfischer/arduino-beginner/actions/workflows/build.yml/badge.svg
     :target: https://github.com/sethfischer/arduino-beginner/actions/workflows/build.yml
     :alt: Build status
+.. |lint-status| image:: https://github.com/sethfischer/arduino-pio/actions/workflows/lint.yml/badge.svg
+    :target: https://github.com/sethfischer/arduino-pio/actions/workflows/lint.yml
+    :alt: Lint status

lint-c.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+shopt -s globstar
+
+exit_code=0
+
+# Check clang-format
+for filename in **/*.{cpp,h} ; do
+    if [ -f "$filename" ]; then
+        echo -e "Check formatting of ${filename}"
+        diff "$filename" <(clang-format -assume-filename=main.cpp "$filename") 1>&2
+        # shellcheck disable=SC2181
+        if [ $? -ne 0 ]; then
+            exit_code=1
+            echo -e "Fail"
+        else
+            echo -e "Pass"
+        fi
+    fi
+done
+
+exit $exit_code