Lagrange

Lagrange turns a folder of markdown into a static, multilingual documentation site — WASI-rendered, with a built-in language switcher and root redirect to English. No JavaScript framework, no mdBook, no Node toolchain.

Lagrange renders its own documentation: the docs/ tree next to this README is built by Lagrange itself (just docs). If you are reading the published site, it was produced by Lagrange.

Quick start

Build the site for this very repo:

git clone https://github.com/celestia-island/lagrange
cd lagrange
cargo run --release -- build --src docs --out target/site

Open target/site/index.html — it redirects into the English book.

Point Lagrange at any docs tree with the same shape:

docs/
├── logo.webp          # shared assets live at the docs root
├── en/
│   ├── README.md      # becomes <site>/en/index.html
│   ├── SUMMARY.md     # drives the sidebar
│   └── guides/*.md
└── zh-Hans/ …             # one directory per language

lagrange build --src docs --out _site

README.md and index.md both map to index.html; a docs/en/README.md symlink to the root README.md is the recommended way to keep the GitHub landing page and the docs index in sync.

Deploying the site

Lagrange emits a plain static directory, so it deploys anywhere. The build is just lagrange build --src docs --out <dir> (or cargo run --release -- build … when consumed from source).

GitHub Actions → GitHub Pages

A ready-made composite action checks Lagrange out alongside your repo and runs the build. This is what Lagrange itself uses (.github/workflows/docs.yml):

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: celestia-island/lagrange/.github/actions/build@dev
        with:
          src: docs
          out: _site
      - run: echo "your-project.docs.celestia.world" > _site/CNAME
      - uses: actions/upload-pages-artifact@v3
        with:
          path: _site
  deploy:
    needs: build
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - uses: actions/deploy-pages@v4

Cloudflare Pages

Build command cargo run --release -- build --src docs --out _site, build output directory _site. For a prebuilt Lagrange, mirror celestia-island/lagrange and run cargo run --release -- build --src $DOCS_DIR --site_url $CF_PAGES_URL --out _site. --site_url is optional and only affects absolute links in the language switcher.

Vercel

Framework preset Other, build command cargo run --release -- build --src docs --out public, output directory public. (Vercel needs the Rust toolchain — use the vercel-rust runtime builder, or build in a prior CI step and deploy the static output.)

Features

• pest-based markdown parser — block + inline, modelled on [ratatui-markdown](https://github.com/celestia-island/ratatui-markdown), plus raw-HTML-block pass-through so centred README markup survives.
• tairitsu VDom rendering — documents become VNode trees serialised via `render_to_html`.
• Multilingual — one directory per language, a built-in language switcher, and a root redirect to English.
• Self-hosting — Lagrange's own documentation is built by Lagrange.

License

SySL-1.0 (Synthetic Source License). See LICENSE or the SySL website.