renovate.yml

name: Renovate
on:
  push:
    branches:
      - 'renovate/**'
    paths:
      - '.github/workflows/renovate.yml'
      - '**/yarn.lock'

jobs:
  changeset:
    runs-on: ubuntu-latest
    if: github.actor == 'renovate[bot]'
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 2
          ref: ${{ github.head_ref }}
          token: ${{ secrets.BELLA_ACTION_TOKEN }}
      - name: Configure Git
        run: |
          git config --global user.email devs@magicbell.io
          git config --global user.name 'MagicBella'

      - name: Generate changeset
        uses: actions/github-script@v7
        with:
          script: |
            const { promises: fs } = require('fs');

            async function getPackagesNames(files) {
              const names = [];
              for (const file of files) {
                const pkg = JSON.parse(await fs.readFile(file, 'utf8'));
                if (pkg.private) continue;
                names.push(pkg.name);
              }
              return names;
            }

            async function createChangeset(fileName, packageBumps, packages) {
              let message = 'Updated dependencies:\n\n';

              for (const [pkg, bump] of packageBumps) {
                message = message + `- updated \`${pkg}\` to \`${bump}\`.\n`;
              }

              const pkgs = packages.map((pkg) => `'${pkg}': patch`).join('\n');
              const body = `---\n${pkgs}\n---\n\n${message.trim()}\n`;
              await fs.writeFile(fileName, body);
            }
                
            async function getBumps(files) {
              const bumps = new Map();
              for (const file of files) {
                const { stdout: changes } = await exec.getExecOutput('git', ['show', file]);
                for (const change of changes.split('\n')) {
                  if (!change.startsWith('+ ')) continue;
                  const match = change.match(/"(.*?)"/g);
                  bumps.set(match[0].replace(/"/g, ''), match[1].replace(/"/g, ''));
                }
              }
              return bumps;
            }

            const branch = await exec.getExecOutput('git branch --show-current');

            if (!branch.stdout.startsWith('renovate/')) {
              console.log('Not a renovate branch, skipping');
              return;
            }

            const diffOutput = await exec.getExecOutput('git diff --name-only HEAD~1');
            const diffFiles = diffOutput.stdout.split('\n');

            if (diffFiles.find((f) => f.startsWith('.changeset'))) {
              console.log('Changeset already exists, skipping');
              return;
            }
              
            const files = diffFiles
              .filter((file) => file !== 'package.json') // skip root package.json
              .filter((file) => file.includes('package.json'));
            const packageNames = await getPackagesNames(files);

            if (!packageNames.length) {
              console.log('No package.json changes to published packages, skipping');
              return;
            }

            const { stdout: shortHash } = await exec.getExecOutput('git rev-parse --short HEAD');
            const fileName = `.changeset/renovate-${shortHash.trim()}.md`;

            const packageBumps = await getBumps(files);
            await createChangeset(fileName, packageBumps, packageNames);
            await exec.exec('git', ['add', fileName]);
            await exec.exec('git commit -C HEAD --amend --no-edit');
            await exec.exec('git config --global user.email "noreply@magicbell.io"');
            await exec.exec('git config --global user.name "MagicBella"');
            await exec.exec('git push --force');