name: Build HTML presentation

on:
  push:
    branches: [main]
    paths:
      - presentation-fr.md
      - img/**
  workflow_dispatch:

jobs:
  render:
    runs-on: linux-host
    steps:
      - name: Checkout
        run: |
          rm -rf work
          AUTH_URL=$(echo "$GITHUB_SERVER_URL" | sed -E "s#^(https?)://#\1://x-access-token:${{ secrets.GITHUB_TOKEN }}@#")
          git clone --depth 1 "${AUTH_URL}/${GITHUB_REPOSITORY}.git" work

      - name: Render presentation-fr.html with Marp
        run: |
          cd work
          /usr/local/bin/marp presentation-fr.md -o presentation-fr.html --html --allow-local-files

      - name: Commit and push if changed
        run: |
          cd work
          git config user.email "ci@f1.cyberwild.org"
          git config user.name "graft-presentation-ci"
          git add presentation-fr.html
          if git diff --cached --quiet; then
            echo "Nothing to commit"
            exit 0
          fi
          git commit -m "ci: regenerate presentation-fr.html"
          git push origin HEAD:main