name: Contrib Deploy
on:
  push:
    branches:
      - master

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

permissions:
  contents: read

jobs:
  deploy:
    permissions:
      contents: write  # for Git to git push
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0
    - name: Install mdbook
      run: |
        mkdir mdbook
        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.44/mdbook-v0.4.44-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
        echo `pwd`/mdbook >> $GITHUB_PATH
    - name: Deploy docs
      run: |
        GENERATE_PY="$(pwd)/ci/generate.py"

        cd src/doc/contrib
        mdbook build

        # Override previous ref to avoid keeping history.
        git worktree add --orphan -B gh-pages gh-pages
        git config user.name "Deploy from CI"
        git config user.email ""
        cd gh-pages
        mv ../book contrib
        git add contrib

        # Generate HTML for link redirections.
        python3 "$GENERATE_PY"
        git add *.html
        # WARN: The CNAME file is for GitHub to redirect requests to the custom domain.
        # Missing this may entail security hazard and domain takeover.
        # See <https://docs.github.com/en/pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site#securing-your-custom-domain>
        git add CNAME

        git commit -m "Deploy $GITHUB_SHA to gh-pages"
        git push origin +gh-pages
