trigger-preview.yml

name: trigger preview
on:
  workflow_run:
    workflows: ["trigger build"]
    types: [completed]

jobs:
  get-pr-number:
    runs-on: ubuntu-latest
    outputs:
      PR_NUMBER: ${{ steps.get-pr-number.outputs.PR_NUMBER }}
      SHA: ${{ steps.get-pr-number.outputs.SHA }}
    steps:
    - name: Download PR number artifact
      uses: dawidd6/action-download-artifact@v3.1.4
      with:
        name: pr_number
        github_token: ${{ secrets.GITHUB_TOKEN }}
        workflow: trigger-build
        run_id: ${{ github.event.workflow_run.id }}


    - name: Read PR number
      id: get-pr-number
      run: |
        tree .
        cat pr_number.txt
        { read PR_NUMBER; read SHA; } < pr_number.txt
        echo "PR_NUMBER=$PR_NUMBER" >> $GITHUB_OUTPUT
        echo "SHA=$SHA" >> $GITHUB_OUTPUT

  make-or-find-preview-comment:
    needs: get-pr-number
    uses: './.github/workflows/preview-comment.yml'
    with:
      pr_number: ${{ needs.get-pr-number.outputs.PR_NUMBER }}
      sha: ${{ needs.get-pr-number.outputs.SHA }}
      no_update: 'true'

  build-for-preview:
    needs: get-pr-number
    uses: './.github/workflows/build.yml'
    with:
      artifact_name: docs-zip-${{ needs.get-pr-number.outputs.PR_NUMBER }}
      build_from_code_artifact: true
      code_artifact_name: code-zip-${{ needs.get-pr-number.outputs.PR_NUMBER }}

  deploy-preview:
    needs: [get-pr-number, build-for-preview]
    if: github.event.workflow_run.conclusion == 'success'
    uses: './.github/workflows/gh-pages.yml'
    with:
      artifact_name: docs-zip-${{ needs.get-pr-number.outputs.PR_NUMBER }}
      destination_dir: _preview/${{ needs.get-pr-number.outputs.PR_NUMBER }}  # deploy to subdirectory labeled with PR number

  preview-comment:
    needs: [get-pr-number, deploy-preview, make-or-find-preview-comment]
    uses: './.github/workflows/preview-comment.yml'
    with:
      pr_number: ${{ needs.get-pr-number.outputs.PR_NUMBER }}
      sha: ${{ needs.get-pr-number.outputs.SHA }}