name: Cache

on:
  push:
    paths:
      - .github/workflows/cache.yml
  schedule:
    - cron: "0 */6 * * *" # every 6 hours

concurrency:
  group: cache
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  update:
    if: startsWith(github.repository, 'Homebrew/')
    strategy:
      matrix:
        os:
          - macos-11.0
          - ubuntu-latest
    runs-on: ${{ matrix.os }}
    steps:
      - name: Set up Homebrew
        id: set-up-homebrew
        uses: Homebrew/actions/setup-homebrew@master
        with:
          test-bot: false

      # Workaround until the `cache` action uses the changes from
      # https://github.com/actions/toolkit/pull/580.
      - name: Unlink workspace
        run: |
          rm "${GITHUB_WORKSPACE}"
          mkdir "${GITHUB_WORKSPACE}"

      - name: Cache Homebrew Gems
        id: cache
        uses: actions/cache@v3
        with:
          path: ${{ steps.set-up-homebrew.outputs.gems-path }}
          key: ${{ runner.os }}-rubygems-${{ steps.set-up-homebrew.outputs.gems-hash }}
          restore-keys: ${{ runner.os }}-rubygems-

      - name: Install Homebrew Gems
        id: gems
        run: brew install-bundler-gems
        if: steps.cache.outputs.cache-hit != 'true'