Add clang-format configuration and format check workflow #1

	name: Formatting check

	on: [pull_request]

	jobs:
	formatting-check:
	name: Formatting check
	runs-on: ubuntu-24.04

	steps:
	- uses: actions/checkout@v4
	with:
	# To get a diff from the PR we need to fetch 2 commits.
	# The checkout action will create a merge commit as {{ github.sha }}.
	fetch-depth: 2

	- name: Install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -yqq clang-format

	- name: Format check
	id: format-check
	run: \|
	git diff -U0 --no-color ${{ github.sha }}^ -- '.cpp' '.c' '.h' '.hpp' \|
	/usr/share/clang/clang-format-16/clang-format-diff.py -p1 > clang-format.patch

	# Check if patch is not empty
	if [ -s clang-format.patch ]; then
	echo "###############################################################"
	echo "# Format checks failed!"
	echo "# A patch has been uploaded as an artifact and is shown below."
	echo "###############################################################"

	# Show patch
	cat clang-format.patch

	exit 1
	fi

	- name: Upload format fixes patch
	uses: actions/upload-artifact@v4
	if: ${{ failure() && steps.format-check.outcome == 'failure' }}
	with:
	name: clang-format.patch
	path: clang-format.patch
	if-no-files-found: ignore

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