name: Build docs

on:
  release:
    types: [published]

jobs:
  deploy:
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v3

      - name: Use Node.js
        uses: actions/setup-node@v3
        with:
          node-version-file: .node-version

      # We want to install matrix-appservice-bridge, which we depend on.
      - run: yarn --ignore-scripts
  
      - name: Get release tag
        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV

      - name: Set up mdBook
        uses: peaceiris/actions-mdbook@v1
        with:
          mdbook-version: '0.4.11'

      - name: Set version of docs
        run: echo 'window.HOOKSHOT_VERSION = "${{ env.RELEASE_VERSION }}";' > ./docs/_site/version.js

      - run: mdbook build

      - name: Deploy latest
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          keep_files: true
          publish_dir: ./book
          destination_dir: ./${{ env.RELEASE_VERSION }}