deploy.yml

name: deploy
on:
  push:
    branches:
      - main
jobs:
  deploy:
    runs-on: ubuntu-latest
    container:
      image: nixos/nix:latest
    steps:
      - name: deploy
        run: |
          set -x

          git clone https://github.com/${{ github.repository }}.git
          cd $(basename ${{ github.repository }})

          echo "github.event_name is ${{ github.event_name }}"

          # fetch the current PR/branch
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            echo "Fetching PR branch"
            git fetch origin pull/${{ github.event.pull_request.number }}/head:pr-${{ github.event.pull_request.number }}
            git checkout pr-${{ github.event.pull_request.number }}
          else
            echo "Fetching current branch"
            git checkout ${{ github.ref_name }}
          fi

          nix-shell --run "
            dune build @doc &&
            mv _build/default/_doc/_html doc
          "
          touch doc/.nojekyll

          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"

          git clone https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }} gh-pages
          cd gh-pages
          git checkout gh-pages || git checkout --orphan gh-pages

          rm -rf ./*
          cp -r ../doc/* ./

          git add .
          git commit -m "Deploy docs from ${GITHUB_SHA}" || echo "No changes to commit"
          git push origin gh-pages