name: docs
on:
  - push
defaults:
  run:
    shell: bash

jobs:
  publish-docs:
    if: startsWith(github.ref, 'refs/tags/')
    runs-on: macos-11
    steps:
      - name: Get the version
        id: get_version
        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
      - uses: actions/checkout@v2
      - uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
      - name: Write tags manifest
        run: |
          echo ${{ steps.get_version.outputs.VERSION }} > docs/assets/versions.txt
          tags=`git ls-tree --name-only origin/gh-pages | egrep "^((([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?)(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?)$"`
          echo $tags >> docs/assets/versions.txt
          for version in $tags; do
            cp docs/assets/versions.txt $version/assets/
            cat $version/assets/versions.txt
          done
          cat docs/assets/versions.txt
      - name: Build jekyll site
        run: |
          cd docs/
          gem install bundler
          bundle install

          # Generate top-level docs
          bundle exec jekyll build \
            --destination _latest

          # Generate versioned docs
          bundle exec jekyll build \
            --baseurl ${{ steps.get_version.outputs.VERSION }} \
            --destination ${{ steps.get_version.outputs.VERSION }}
      - name: Publish Latest Docs
        uses: JamesIves/github-pages-deploy-action@v4.2.2
        with:
          branch: gh-pages
          folder: docs/_latest
          target-folder: .
          clean: false
      - name: Publish Versioned Docs
        uses: JamesIves/github-pages-deploy-action@v4.2.2
        with:
          branch: gh-pages
          folder: docs/${{ steps.get_version.outputs.VERSION }}
          target-folder: ${{ steps.get_version.outputs.VERSION }}
          clean: false