name: Action on PR labeled

# This workflow has write permissions on the repo
# It must not checkout a PR and run untrusted code

on:
  pull_request_target:
    types:
      - labeled

permissions:
  pull-requests: 'write'

jobs:
  comment-on-breaking-change-label:
    runs-on: ubuntu-latest
    if: github.event.label.name == 'M-Needs-Migration-Guide' && !contains(github.event.pull_request.body, '## Migration Guide')
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            await github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: `It looks like your PR is a breaking change, but you didn't provide a migration guide.

              Could you add some context on what users should update when this change get released in a new version of Bevy?
              It will be used to help writing the migration guide for the version. Putting it after a \`## Migration Guide\` will help it get automatically picked up by our tooling.`
            })