render-diagrams.yml

name: Update PDF, PNG and SVG assets for changed TeX files

on:
  pull_request:
    branches: [main]
    paths: [assets/**/*.tex]

jobs:
  update-assets:
    name: Update assets
    runs-on: ubuntu-latest
    # don't run on forks and only if PR was opened from branch on this repo
    if: github.repository_owner == 'janosh' && github.event.pull_request.head.repo.fork == false
    steps:
      - name: Check out repo
        uses: actions/checkout@v4
        with:
          # get full history to include BASE_REF commit where PR branched off
          fetch-depth: 0

      - name: Get changed TeX files
        id: diff
        run: |
          BASE_REF=${{ github.event.before }}
          git fetch origin $BASE_REF --depth=1
          echo "TeX files changed between BASE_REF=$BASE_REF and SHA=$GITHUB_SHA:"
          tex_files=$(git diff --name-only $BASE_REF $GITHUB_SHA | grep .tex$ | xargs)
          echo "$tex_files"
          typst_files=$(git diff --name-only $BASE_REF $GITHUB_SHA | grep .typ$ | xargs)
          echo "$typst_files"
          echo "::set-output name=tex-files::$tex_files"
          echo "::set-output name=typst-files::$typst_files"

      - name: Install compression deps
        if: steps.diff.outputs.tex-files != ''
        run: |
          sudo apt-get install -y pdf2svg imagemagick pngquant zopfli
          sudo snap install svgo
          pip install pdf-compressor
          pdf-compressor --set-api-key ${{ secrets.ILOVEPDF_PUBLIC_KEY }}

      - name: Install TeX Live
        if: steps.diff.outputs.tex-files != ''
        # texlive-latex-extra is needed for package standalone
        run: sudo apt-get install texlive latexmk texlive-latex-base texlive-latex-extra

      - name: Install Typst
        if: steps.diff.outputs.typst-files != ''
        uses: typst-community/setup-typst@v3

      - name: Run render_(typst|tikz).py on changed TeX files
        if: steps.diff.outputs.tex-files != ''
        id: render-diagrams
        run: |
          for tex_file in ${{ steps.diff.outputs.tex-files }}; do
            echo "Processing $tex_file..."
            python scripts/render_tikz.py "$tex_file"
          done
          for typst_file in ${{ steps.diff.outputs.typst-files }}; do
            echo "Processing $typst_file..."
            python scripts/render_typst.py "$typst_file"
          done

      - name: Push changes if any
        if: steps.render-diagrams.outcome == 'success'
        run: |
          git config user.name 'Janosh Riebesell'
          git config user.email janosh.riebesell@gmail.com
          git checkout ${{ github.head_ref }}
          git add assets/**/*.{pdf,svg,png}
          git commit -m 'assets for ${{ steps.diff.outputs.tex-files }}'
          git push