generate-html-for-pull-request.yaml

name: Generate and serve changed course html files

on:
  pull_request:
    branches:
      - main
    paths:
      - src/G*/*

jobs:
  build-preview:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Check if enough lines were changed
        id: enough_lines
        run: |
          git checkout ${{ github.head_ref }}

          LATEST=$(git rev-parse HEAD)
          SECOND_LATEST=$(git rev-parse HEAD~1)

          LINES_CHANGED=$(git diff --shortstat $SECOND_LATEST $LATEST | awk '{print $4 + $6}')

          echo "Lines changed: $LINES_CHANGED"

          if [ "$LINES_CHANGED" -gt 10 ]; then
            echo "continue=true" >> $GITHUB_ENV
          else
            echo "continue=false" >> $GITHUB_ENV
          fi

      - name: Find directories with changed rmd or image files
        if: env.continue == 'true'
        id: changed-files-dir-names
        uses: tj-actions/changed-files@v41
        with:
          files:  |
            src/G*/*.{rmd,Rmd}
            src/G*/img/*.{png,gif}
            src/G*/img/*/*.{png,gif}
          dir_names: "true"
          dir_names_max_depth: 2


      - name: Render modified courses to HTML and move output to docs
        if: env.continue == 'true'
        run: |
          folder_list="${{ steps.changed-files-dir-names.outputs.all_changed_files }}"
          IFS=" "
          read -ra folders <<< "$folder_list"

          export ARTIFACT=true

          for folder in "${folders[@]}"; do
            code="${folder#src/}"
            ./render.sh $code
          done

      - name: Upload artifacts
        if: env.continue == 'true'
        id: upload-artifacts
        uses: actions/upload-artifact@v4
        with:
          name: preview_changed_docs
          path: artifact
          retention-days: 7

      - name: Add Comment
        if: env.continue == 'true'
        uses: actions/github-script@v4
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const body = "Preview changes [here](${{ steps.upload-artifacts.outputs.artifact-url }})."
            github.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: body
            });