Add CI workflows for PR test coverage enforcement and Nix builds #12

	on:
	pull_request:
	branches:
	- main

	jobs:
	test-coverage:
	name: Tests & Code Coverage
	runs-on: ubuntu-latest
	permissions:
	contents: read

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Install Nix
	uses: cachix/install-nix-action@v27
	with:
	nix_path: nixpkgs=channel:nixos-unstable

	- name: Install ALSA & MIDI
	run: \|
	sudo apt-get update
	sudo apt-get install -y alsa-utils linux-modules-extra-$(uname -r)
	# No virmidi module on Actions TODO mock MIDI for this env

	# - name: Config Cachix TODO
	# uses: cachix/cachix-action@v15
	# with:
	# name: devenv

	- name: Configure & build project
	run: \|
	nix develop --command bash -c "cmake --build build -j$(nproc)"

	- name: Run tests
	run: \|
	nix develop --command bash -c "cmake --build build --target tests"

	- name: Run main
	run: \|
	nix develop --command bash -c "cmake --build build --target run"

	- name: Measure code coverage
	run: \|
	nix develop --command bash -c "cmake --build build --target coverage"

	- name: Export coverage report totals as text
	run: \|
	nix develop --command bash -c "llvm-cov report build/src/main -instr-profile=build/coverage.profdata -ignore-filename-regex='test/.*' > build/coverage.txt"
	cat build/coverage.txt

	- name: Verify functions coverage is (almost) 100% (MIDI tests impossible on CI)
	run: \|
	grep TOTAL build/coverage.txt \| awk '{ if ($7 + 0 > 90) exit 0; else exit 1 }'

	- name: Verify line coverage is at least 90%
	run: \|
	grep TOTAL build/coverage.txt \| awk '{ if ($10 + 0 > 90) exit 0; else exit 1 }'

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