deploy-github-pages.yml

name: deploy-github-pages

on:
  push:
    branches:
      - main

jobs:
  build-slides:
    name: "Build slides"
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
      - name: Setup node environment
        uses: actions/setup-node@v3
        with:
          node-version: "18"
      - name: Cache npm environment
        uses: actions/cache@v3
        with:
          path: ~/.npm
          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
          restore-keys: |
            ${{ runner.os }}-node-
      - name: Install dependencies
        run: npm ci
      - name: Verify that snippets were embedded
        run: npm run embed-verify
      - name: Build slides
        run: npm run build
      - name: Upload slides artifact
        uses: actions/upload-artifact@v3
        with:
          name: slides
          path: ./slides/dist
  build-excerpt:
    name: "Build excerpt"
    runs-on: ubuntu-latest
    container:
      image: docker://pandoc/core:2.19.2
      options: --entrypoint=/bin/sh
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
      - name: Create output directory
        run: mkdir -p ./slides/dist
      - name: Build excerpt
        run: ./excerpt.sh
        working-directory: slides
      - name: Upload excerpt artifact
        uses: actions/upload-artifact@v3
        with:
          name: excerpt
          path: ./slides/dist/excerpt.html
  deploy:
    name: "Deploy to GitHub pages"
    if: always()
    needs: [build-slides, build-excerpt]
    runs-on: ubuntu-latest
    steps:
      - name: Create artifact download directory
        run: mkdir -p ./dist
      - name: Download slides artifact
        uses: actions/download-artifact@v3
        continue-on-error: true
        with:
          name: slides
          path: ./dist
      - name: Download excerpt artifact
        uses: actions/download-artifact@v3
        continue-on-error: true
        with:
          name: excerpt
          path: ./dist
      - name: Check for existing artifacts
        run: |
          if [ -z "$(ls -A ./dist)" ]; then
              exit 1 # folder empty, no artifacts
          else
              exit 0
          fi
      - name: Deploy to GitHub Pages
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./dist
          force_orphan: true