meta: request reviews from github actions

.github/workflows/request-reviews.yml

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+name: Request reviews for PRs
+
+on:
+ pull_request_target:
+ types: [opened]
+
+permissions:
+ contents: read
+ pull-requests: write
+ issues: write
+
+jobs:
+ main:
+ runs-on: ubuntu-latest
+
+ steps:
+ - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
+ name: Checkout default branch
+ - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+ name: Make initial comment
+ with:
+ script: |
+ const initialCommentBuilder = require('${{ github.workspace }}/tools/actions/pr-open.js');
+ await initialCommentBuilder(github, context);

tools/actions/pr-open.js

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+'use strict';
+
+module.exports = async (client, context) => {
+ function globToRegex(glob) {
+ const patterns = {
+ '*': '([^\\/]+)',
+ '**': '(.+\\/)?([^\\/]+)',
+ '**/': '(.+\\/)',
+ };
+
+ const escapedGlob = glob.replace(/\./g, '\\.').replace(/\*\*$/g, '(.+)');
+ const regexString = '^(' + escapedGlob.replace(/\*\*\/|\*\*|\*/g, (match) => patterns[match] || '') + ')$';
+ return new RegExp(regexString);
+ }
+
+ class CodeOwners {
+ constructor(fileContent) {
+ this.owners = fileContent.split('\n').map((line) => line.trim())
+ .filter((line) => line && !line.startsWith('#'))
+ .map((line) => {
+ const [path, ...owners] = line.split(/\s+/);
+ return { path: globToRegex(path), owners };
+ });
+ }
+
+ getOwners(filePath) {
+ const normalizedPath = filePath.startsWith('/') ? filePath : `/${filePath}`;
+ return this.owners
+ .filter(({ path }) => path.test(normalizedPath))
+ .flatMap(({ owners }) => owners);
+ }
+ }
+
+ async function getChangedFiles(base, head) {
+ const { data } = await client.rest.repos.compareCommits({
+ owner: context.repo.owner,
+ repo: context.repo.repo,
+ base,
+ head,
+ });
+ return data.files.map((file) => file.filename);
+ }
+
+ async function getCodeOwners() {
+ const { data } = await client.rest.repos.getContent({
+ owner: context.repo.owner,
+ repo: context.repo.repo,
+ path: '.github/CODEOWNERS',
+ });
+
+ const content = Buffer.from(data.content, 'base64').toString('utf8');
+ return new CodeOwners(content);
+ }
+
+ async function makeInitialComment(changedFiles) {
+ const codeOwners = await getCodeOwners();
+
+ const owners = new Set();
+ changedFiles.forEach((file) => {
+ codeOwners.getOwners(file).forEach((owner) => owners.add(owner));
+ });
+
+ const ownersList = Array.from(owners).map((owner) => `- ${owner}`).join('\n');
+
+ const body =
+ 'The following teams have been pinged to review your changes:\n\n' +
+ ownersList;
+
+ return client.rest.issues.createComment({
+ owner: context.repo.owner,
+ repo: context.repo.repo,
+ issue_number: context.payload.pull_request.number,
+ body: body,
+ });
+ }
+
+ const base = context.payload.pull_request?.base?.sha;
+ const head = context.payload.pull_request?.head?.sha;
+
+ if (!base || !head) {
+ throw new Error('Cannot get base or head commit');
+ }
+
+ const changedFiles = await getChangedFiles(base, head);
+ await makeInitialComment(changedFiles);
+};