update-cache.yaml

name: "03 Maintain: Update Package Cache"

on:
  workflow_dispatch:
    inputs:
      name:
        description: 'Who triggered this build (enter github username to tag yourself)?'
        required: true
        default: 'monthly run'
  schedule:
    # Run every tuesday
    - cron: '0 0 * * 2'

jobs:
  preflight:
    name: "Preflight Check"
    runs-on: ubuntu-latest
    outputs:
      ok: ${{ steps.check.outputs.ok }}
    steps:
      - id: check
        run: |
          if [[ ${{ github.event_name }} == 'workflow_dispatch' ]]; then
            echo "ok=true" >> $GITHUB_OUTPUT
            echo "Running on request"
          # using single brackets here to avoid 08 being interpreted as octal
          # https://github.com/carpentries/sandpaper/issues/250
          elif [ `date +%d` -le 7 ]; then
            # If the Tuesday lands in the first week of the month, run it
            echo "ok=true" >> $GITHUB_OUTPUT
            echo "Running on schedule"
          else
            echo "ok=false" >> $GITHUB_OUTPUT
            echo "Not Running Today"
          fi

  check_renv:
    name: "Check if We Need {renv}"
    runs-on: ubuntu-latest
    needs: preflight
    if: ${{ needs.preflight.outputs.ok == 'true'}}
    outputs:
      needed: ${{ steps.renv.outputs.exists }}
    steps:
      - name: "Checkout Lesson"
        uses: actions/checkout@v3
      - id: renv
        run: |
          if [[ -d renv ]]; then
            echo "exists=true" >> $GITHUB_OUTPUT
          fi

  check_token:
    name: "Check SANDPAPER_WORKFLOW token"
    runs-on: ubuntu-latest
    needs: check_renv
    if: ${{ needs.check_renv.outputs.needed == 'true' }}
    outputs:
      workflow: ${{ steps.validate.outputs.wf }}
      repo: ${{ steps.validate.outputs.repo }}
    steps:
      - name: "validate token"
        id: validate
        uses: carpentries/actions/check-valid-credentials@main
        with:
          token: ${{ secrets.SANDPAPER_WORKFLOW }}

  update_cache:
    name: "Update Package Cache"
    needs: check_token
    if: ${{ needs.check_token.outputs.repo== 'true' }}
    runs-on: ubuntu-latest
    env:
      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
      RENV_PATHS_ROOT: ~/.local/share/renv/
    steps:

      - name: "Checkout Lesson"
        uses: actions/checkout@v3

      - name: "Set up R"
        uses: r-lib/actions/setup-r@v2
        with:
          use-public-rspm: true
          install-r: false

      - name: "Update {renv} deps and determine if a PR is needed"
        id: update
        uses: carpentries/actions/update-lockfile@main
        with:
          cache-version: ${{ secrets.CACHE_VERSION }}

      - name: Create Pull Request
        id: cpr
        if: ${{ steps.update.outputs.n > 0 }}
        uses: peter-evans/create-pull-request@v4.2.0
        with:
          token: ${{ secrets.SANDPAPER_WORKFLOW }}
          delete-branch: true
          branch: "update/packages"
          commit-message: "[actions] update ${{ steps.update.outputs.n }} packages"
          title: "Update ${{ steps.update.outputs.n }} packages"
          body: |
            :robot: This is an automated build

            This will update ${{ steps.update.outputs.n }} packages in your lesson with the following versions:

            ```
            ${{ steps.update.outputs.report }}
            ```

            :stopwatch: In a few minutes, a comment will appear that will show you how the output has changed based on these updates.

            If you want to inspect these changes locally, you can use the following code to check out a new branch:

            ```bash
            git fetch origin update/packages
            git checkout update/packages
            ```

            - Auto-generated by [create-pull-request][1] on ${{ steps.update.outputs.date }}
            
            [1]: https://github.com/peter-evans/create-pull-request
          labels: "type: package cache"
          draft: false