Add CI action that reports clang-tidy warnings as review comments. #8

	name: Auto Review Analyzers

	on:
	push:
	branches:
	- main
	paths-ignore:
	# Do not trigger action when docs are updated.
	- 'docs/**'
	pull_request:
	branches:
	- main

	jobs:
	clang-tidy:
	runs-on:
	labels: ubuntu-22.04-64core

	permissions:
	# Open PR comments
	pull-requests: write
	# OPTIONAL: auto-closing conversations requires the `contents` permission
	contents: write

	steps:
	- uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	fetch-depth: 0

	- name: Fetch base branch to compare to
	run: \|
	git remote add review-base "https://github.com/${{ github.event.pull_request.base.repo.full_name }}"
	git fetch --no-tags --no-recurse-submodules review-base "${{ github.event.pull_request.base.ref }}"

	- name: Restore Nightly Bazel Cache
	uses: actions/cache/restore@v4
	with:
	path: "~/.cache/bazel"
	key: bazel-cache-nightly-${{ runner.os }}-${{ github.sha }}
	restore-keys: bazel-cache-nightly-${{ runner.os }}-

	- name: Create compilation DB
	run: \|
	xls/dev_tools/make-compilation-db.sh

	- name: Run clang-tidy on diff
	run: \|
	mkdir clang-tidy-result
	git diff -U1000 "$(git merge-base HEAD review-base/${{ github.event.pull_request.base.ref }})" \| xls/dev_tools/run-clang-tidy-diff.sh -p1 -path build -export-fixes clang-tidy-result/fixes.yml

	- name: Run clang-tidy-pr-comments action
	uses: hzeller/clang-tidy-pr-comments@master
	with:
	# Token to allow commenting
	github_token: ${{ secrets.GITHUB_TOKEN }}
	clang_tidy_fixes: clang-tidy-result/fixes.yml
	request_changes: true
	suggestions_per_comment: 10

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