labelpr.yaml

name: Label PRs

on:
  pull_request_target:
    types: [opened, edited, synchronize, reopened]

jobs:
  label_pr:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v3
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const pr_welcome_msg = `Thanks for making a pull request! 😃\nOne of the maintainers will review and advise on the next steps.`;
            // https://github.com/commitizen/conventional-commit-types
            const valid_pr_types = ['feat', 'fix', 'docs', 'style', 'refactor', 'perf', 'test', 'build', 'ci', 'chore', 'revert'];

            if(context.payload.pull_request.comments === 0) {
              await github.issues.createComment({ ...context.repo, issue_number: context.payload.number, body: pr_welcome_msg});
            }

            const title = context.payload.pull_request.title;
            const results = /^(\w+)(\(\w+\))?!?:/.exec(title);
            if (results === null) return core.setFailed(`The title does not follow conventional commits spec: https://www.conventionalcommits.org/en/v1.0.0/#summary Title: ${title}`);

            const pr_type = results[1];
            core.info(`pr_type: ${pr_type}`);

            if (!valid_pr_types.includes(pr_type)) return core.setFailed(`Unknown pull request type: ${pr_type}`);

            const labels = context.payload.pull_request.labels;
            const new_labels = labels.filter(label => !valid_pr_types.includes(label.name)); // keep all labels that are not in valid_pr_types
            new_labels.push({name: pr_type});
            await github.issues.update({ ...context.repo, issue_number: context.payload.number, labels: new_labels });