render-preview.yml

# Candace Savonen Apr 2021

name: Render Preview

# Controls when the action will run. Triggers the workflow on pull request to main branch
on:
  pull_request:
    branches: [ main ]

jobs:
  # This workflow contains a single job called "build-all"
  build-all:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest
    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - name: checkout
        uses: actions/checkout@v2
        with:
          # get the full repo
          fetch-depth: 0
          # use github PAT
          token: ${{ secrets.GH_PAT }}

      # Run bookdown rendering
      - name: Run bookdown render
        run: |
          docker run \
          --mount type=bind,target=/home/rstudio,source=$PWD \
          jhudsl/course_template \
          Rscript -e "bookdown::render_book('index.Rmd')"

##### If you do not wish to host your course on Coursera, you can delete this section #####
      # Run Coursera version
      - name: Run Coursera version of render
        run: |
          docker run \
          --mount type=bind,target=/home/rstudio,source=$PWD \
          jhudsl/course_template \
          Rscript -e "leanbuild::render_coursera()"

##### End of Coursera rendering section ########################################

      # Commit the rendered bookdown files
      - name: Commit rendered bookdown files to development branch
        run: |
          git checkout -b "preview-${{ github.event.pull_request.number }}"
          git config --local user.email "actions@github.com"
          git config --local user.name "GitHub Actions"
          git add -A
          git commit -m 'Render bookdown preview' || echo "No changes to commit"
          git push --force origin "preview-${{ github.event.pull_request.number }}" || echo "No changes to push"

      - name: Find Comment
        uses: peter-evans/find-comment@v1
        id: fc
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: 'github-actions[bot]'
          body-includes: Re-rendered

      - name: Build components of the comment
        id: build-components
        run: |
          bookdown_link=$(echo "https://htmlpreview.github.io/?https://raw.githubusercontent.com/$GITHUB_REPOSITORY/preview-${{ github.event.pull_request.number }}/docs/index.html")
          coursera_link=$(echo "https://htmlpreview.github.io/?https://raw.githubusercontent.com/$GITHUB_REPOSITORY/preview-${{ github.event.pull_request.number }}/docs/coursera/index.html")
          echo ::set-output name=bookdown_link::$bookdown_link
          echo ::set-output name=coursera_link::$coursera_link
          echo ::set-output name=time::$(date +'%Y-%m-%d')
          echo ::set-output name=commit_id::$GITHUB_SHA

      - name: Create or update comment
        uses: peter-evans/create-or-update-comment@v1
        with:
          comment-id: ${{ steps.fc.outputs.comment-id }}
          issue-number: ${{ github.event.pull_request.number }}
          body: |
            Re-rendered previews from the latest commit:
            - See [preview of Bookdown here](${{ steps.build-components.outputs.bookdown_link }})
            - See [preview of Coursera version here](${{ steps.build-components.outputs.coursera_link }})

            _Updated at ${{ steps.build-components.outputs.time }} with changes from ${{ steps.build-components.outputs.commit_id }}_
          edit-mode: replace