render-release-pdf.yaml

name: Render & Release PDFs
on:
  push:
    branches:
      - main
    paths:
      - src/G*/**
  repository_dispatch:
    types: [update-assets]

jobs:
  check-changes:
    name: Get changed course directories
    runs-on: ubuntu-latest
    outputs:
      # the purpose here is to provide a matrix for the build-and-release-pdf job
      dir-matrix: ${{ steps.changed-files-dir-names.outputs.all_changed_files }}
    steps:

      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Find directories with changed rmd or image files
        id: changed-files-dir-names
        uses: tj-actions/changed-files@v45
        with:
          matrix: "true"  # to use output as matrix
          files: |
            src/G*/*.{rmd,Rmd,html,css}
            src/G*/js/*.js
            src/G*/css/*.css
            src/G*/img/*.{png,gif}
            src/G*/img/*/*.{png,gif}
          dir_names: "true"
          dir_names_max_depth: 2
          dir_names_deleted_files_include_only_deleted_dirs: "true"
          output_renamed_files_as_deleted_and_added: "true"

  # this job runs in parallel for each changed course
  build-and-release-pdf:
    needs: check-changes
    name: Build and release PDF
    runs-on: ubuntu-latest
    permissions:
      contents: write  # needed to make releases
    strategy:
      # matrix to run job for each changed directory
      matrix:
        directory: ${{ fromJSON(needs.check-changes.outputs.dir-matrix) }}
    env:
      COURSE_DIRECTORY: ${{ matrix.directory }}
    steps:

      - name: Checkout
        uses: actions/checkout@v4

      # Some helpful env vars to use later on
      - name: Set env
        run: |
          course_code=$(basename ${COURSE_DIRECTORY})
          echo "COURSE_CODE=${course_code}" >> ${GITHUB_ENV}
          echo "OUT_PDF_PATH=out/${course_code}_pdf/${course_code}.pdf" >> ${GITHUB_ENV}

      - name: Build PDF
        run: |
          ./render_to_pdf.sh "${COURSE_CODE}"

      - name: Make release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ env.COURSE_CODE }}
          body: A PDF version of ${{ env.COURSE_CODE }}
          files: ${{ env.OUT_PDF_PATH }}