name: Build GitHub Pages from md files
on:
  push:
    paths:
      - '*.md'
      - 'docs/*.css'
      - 'docs/*.js'
      - .github/workflows/website.yml
  workflow_dispatch:

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

concurrency:
  group: "pages"
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    outputs:
      docs_changed: ${{ steps.diff.outputs.changed }}
    steps:
      - name: 🛎️ Checkout
        uses: actions/checkout@v6
        with:
          fetch-depth: 2

      - name: Setup Pages
        uses: actions/configure-pages@v4

      - name: Install Pandoc
        run: sudo apt-get update && sudo apt-get install -y pandoc

      - name: Make pages
        run: |
          mkdir -p docs
          ./web-create -b

      - name: Check if docs changed
        id: diff
        run: |
          if git diff --quiet HEAD~1 HEAD -- docs/; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
          else
            echo "changed=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Upload artifact
        if: steps.diff.outputs.changed == 'true'
        uses: actions/upload-pages-artifact@v4
        with:
          path: 'docs/'

  deploy:
    needs: build
    if: needs.build.outputs.docs_changed == 'true'
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4