name: Mark stale issues and pull requests

on:
  schedule:
  - cron: '0 0 * * *'

jobs:
  stale:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/github-script@0.9.0
      with:
        github-token: ${{secrets.GITHUB_TOKEN}}
        script: |
          const { data } = await github.pulls.list({
            owner: context.repo.owner,
            repo: context.repo.repo,
            state: 'open',
          })
          
          await Promise.all(data
            .filter(({
              author_association,
              base,
              head,
              title,
            }) =>
              base.user.login === context.repo.owner &&
              ['OWNER', 'COLLABORATOR', 'MEMBER'].includes(author_association) &&
              head.label.startsWith(`${base.user.login}:patch/autogen/`) &&
              !/WIP/i.test(title)))
            .map(({
              number,
            }) =>
              github.pulls.merge({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: number,
              })))