pr-titles.yaml

name: "Conventional commit titles"
on:
  pull_request:
    types:
      # Check title when opened.
      - opened
      # Check title when new commits are pushed.
      # Required to use as a status check.
      - synchronize
      # When the title or description change
      - edited

jobs:
  validate:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v6
        env:
          # Ensure pull request titles match the Conventional Commits specification
          # https://www.conventionalcommits.org/en/v1.0.0/
          regex: '^(feat|fix|chore|ci|refactor|test|docs)(\(.*\))?!?:'
        with:
          script: |
            if (context.eventName != "pull_request") {
              core.setFailed("This action only works on pull_request events");
              return;
            }
            core.info(`Checking pull request title with regex: ${process.env.regex}`);
            const regex = RegExp(process.env.regex);
            const {data: pullRequest} = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.pull_request.number
            });
            const title = pullRequest.title;
            core.info(`Pull Request title: "${title}"`);
            if (!regex.test(title)) {
                core.setFailed(`Pull Request title "${title}" failed to pass match regex - ${regex}`);
                return;
            }