name: docs

on:
  push:
    branches: [master]
    paths:
      - "docs/**"
      - "Makefile"
      - ".github/workflows/docs.yml"
  workflow_dispatch:

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

concurrency:
  group: pages
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7

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

      - name: Build site
        run: make docs

      # No include-hidden-files: v4 stopped uploading dot-files by default, and
      # build/site has none. It is pandoc output plus a copy of docs/_assets,
      # which holds three ordinary files. _assets is underscore-prefixed, not
      # hidden, and deploy-pages serves the artifact without running Jekyll, so
      # it needs no .nojekyll either.
      - uses: actions/upload-pages-artifact@v5
        with:
          path: build/site

  deploy:
    needs: build
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - uses: actions/deploy-pages@v5
        id: deployment