Add workflow to check for required reviews #6

	name: Check required reviews

	on:
	pull_request:
	types: [labeled, unlabeled]
	pull_request_review:
	types: [submitted]

	jobs:
	check-reviews:
	if: contains(github.event.pull_request.labels.*.name, 'full_review')
	runs-on: ubuntu-latest
	steps:
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.x"

	- name: Check reviews
	env:
	GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	shell: python
	run: \|
	import json
	import os
	import re
	import subprocess
	import sys

	REQUIRED_REVIEWS = 3

	repo = ${{ github.repository }}
	pr_number = ${{ github.event.pull_request.number }}

	# Get info on PR labels and reviews.
	pr_info = json.loads(
	subprocess.run(
	("gh", "pr", "--json", "reviews", "--repo", repo, "view", pr_number),
	check=True,
	capture_output=True,
	timeout=60,
	text=True,
	).stdout
	)

	# Check for enough reviews. Newer reviews invalidate older ones.
	approving_reviewers = set()
	for review in sorted(pr_info["reviews"], key=lambda r: r["submittedAt"]):
	if review["state"] == "APPROVED":
	approving_reviewers.add(review["author"]["login"])
	elif review["state"] == "CHANGES_REQUESTED":
	approving_reviewers.discard(review["author"]["login"])

	if len(approving_reviewers) < REQUIRED_REVIEWS:
	print(f"Not enough reviews: {len(approving_reviewers)}/{REQUIRED_REVIEWS}")
	sys.exit(1)
	else:
	print(f"Sufficient reviews: {len(approving_reviewers)}/{REQUIRED_REVIEWS}")

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