pages.yml

name: Deploy demo to GitHub Pages

# Publishes `demo/starter/dist` to GitHub Pages, served at `slidev.oa.dev` (CNAME).
# Trigger: push to `main`, or manual run.

on:
  push:
    branches: [main]
  workflow_dispatch:

permissions:
  contents: read
  pages: write
  id-token: write

# Allow only one concurrent deploy. New runs cancel a pending one (so a flurry of pushes
# only deploys the latest), but don't interrupt an in-progress deploy.
concurrency:
  group: pages
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Use Node.js 22
        uses: actions/setup-node@v4
        with:
          node-version: 22

      # Mirrors the other workflows in this repo; @antfu/ni picks up the right package
      # manager from `pnpm-lock.yaml`.
      - name: Setup
        run: npm i -g @antfu/ni

      - name: Install
        run: nci
        env:
          CYPRESS_INSTALL_BINARY: 0

      - name: Build packages
        run: nr build

      - name: Build demo
        # `VITE_GIT_SHA` feeds the Install slide's `<InstallSnippet />` so the
        # deployed slide shows a SHA that's actually live on `pkg.pr.new` for
        # the corresponding deploy. Falls back to `git rev-parse` locally.
        run: pnpm -C demo/starter build
        env:
          VITE_GIT_SHA: ${{ github.sha }}

      - name: Add CNAME
        # GH Pages reads CNAME from the artifact root to bind the custom domain.
        run: echo 'slidev.oa.dev' > demo/starter/dist/CNAME

      - uses: actions/configure-pages@v5
        # Auto-create the Pages site on first run instead of failing if the repo doesn't
        # have Pages enabled yet. Requires `pages: write` (already set above).
        with:
          enablement: true
      - uses: actions/upload-pages-artifact@v3
        with:
          path: demo/starter/dist

  deploy:
    needs: build
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - id: deployment
        uses: actions/deploy-pages@v4