deploy_to_github_pages.yml

name: Deploy to GitHub Pages
on:
  push: #Action fires anytime there is a push to the following branches
    branches: 
      - main
      - development
  pull_request: #Action also fires anytime a PR is (re)opened, closed or synchronized
    types: 
      - opened
      - reopened
      - synchronize
      - closed

jobs:
  pr-preview-setup:
    # If the action is fired because of a PR, and the PR is not from the development branch, run this job
    if: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.ref != 'development' }}
    runs-on: ubuntu-latest
    steps:
      - name: Get date
        run: echo "DATE=$(date '+%Y-%m-%d %H:%M %Z')" >> $GITHUB_ENV

      - name: Setup pr-preview
        # If the PR is new (or has been reopened), setup the message that will
        # get updated with the URL after deployment
        if: ${{ github.event.action == 'opened' || github.event.action == 'reopened' }}
        uses: thollander/actions-comment-pull-request@v2.4.3
        with:
          comment_tag: pr-preview
          pr_number: ${{ github.event.number }}
          message: "\
            PR Preview

            :---:

            🛫 Deployment still ongoing.<br>
            Preview URL will be available at the end of the deployment.
            
            For more information, please check the [Actions](https://github.com/ACCESS-Hive/access-hive.github.io/actions) tab.

            ${{ env.DATE }}
            "

      # If the PR is closed, remove the pr-preview URL
      - name: Remove pr-preview URL
        if: ${{github.event.action == 'closed'}}
        uses: thollander/actions-comment-pull-request@v2.4.3
        with:
          comment_tag: pr-preview
          pr_number: ${{ github.event.number }}
          message: "\
            PR Preview
      
            :---:
      
            🛬 Preview removed because the pull request was closed.
      
            ${{ env.DATE }}
            "
  
  build:
    # Cancel any previous build/deploy jobs that are still running (no need to build/deploy multiple times)
    concurrency:
      group: build-deploy
      cancel-in-progress: true
    runs-on: ubuntu-latest
    outputs:
      pr_nums: ${{ steps.build.outputs.pr_nums }}
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          ref: main
      
      - name: Python setup
        uses: actions/setup-python@v4
        with:
          python-version: 3.x

      - name: Install dependencies
        run: pip install -r requirements.txt
      
      # Build full website using main, development and open PRs head branches
      # (excluding `development` and `main` as PR head branches)
      - name: Build full website
        id: build
        shell: bash
        run: |
          retry() {
            command="$1"
            n_tries="$2"
            wait="$3"
            exit_msg="$4"
            eval "$command"
            until [ $? == 0 ]; do
              if [ $i -eq $((n_tries - 1)) ]; then
                echo "$exit_msg"
                exit 1
              else
                ((i++))
              fi
              sleep $wait
              eval "$command"
            done
          }
          
          git fetch --all
          echo "Build main website"
          retry 'mkdocs build -f mkdocs.yml -d ../website' 5 1 "Failed to build main website."
          echo "Build development website"
          retry 'git checkout development' 5 1 "Failed to checkout development branch."
          retry 'mkdocs build -f mkdocs.yml -d ../website/development-website' 5 1 "Failed to build development website."
          echo "Build PR websites"
          command="pr_list=\$(curl -s https://api.github.com/repos/ACCESS-Hive/access-hive.github.io/pulls?state=opened \
          | jq '.[] | select(.head.label!=\"ACCESS-Hive:development\" and .head.label!=\"ACCESS-Hive:main\")')"
          retry "$command" 5 1 "Failed to fetch opened PRs."
          pr_nums=($(jq '.number' <<< $pr_list))
          if [[ -n $pr_nums ]]; then
            echo "Found PR numbers: $(sed 's/\s/, /g' <<< ${pr_nums[@]})."
            pr_sha=($(jq '.head.sha' <<< $pr_list))
            echo "pr_nums=$(sed 's/\s/,/g' <<< [${pr_nums[@]}])" >> "$GITHUB_OUTPUT"
            for i in ${!pr_nums[@]}; do
              retry "git checkout ${pr_sha[i]}" 5 1 "Failed to checkout git hash ${pr_sha[i]}."
              retry "mkdocs build -f mkdocs.yml -d ../website/pr-preview/pr-${pr_nums[i]}" 5 1 "Failed to build pr-${pr_nums[i]} website."
            done
          else
            echo "No open PR found."
          fi
          echo "Give the right file permissions"
          chmod -c -R +rX ../website
      
      - name: Create artifact for deployment to GitHub Pages
        uses: actions/upload-pages-artifact@v2
        with:
          path: ../website
  
  deploy:
    needs: build
    runs-on: ubuntu-latest
    # Cancel any previous build/deploy jobs that are still running (no need to build/deploy multiple times)
    concurrency:
      group: build-deploy
      cancel-in-progress: true
    permissions:
      pages: write      # to deploy to Pages
      id-token: write   # to verify the deployment originates from an appropriate source

    steps:
      - name: Deploy to GitHub Pages
        uses: actions/deploy-pages@v2
  
  # Set pr-preview URL
  pr-preview:
    needs: [build,deploy]
    # If there are open PRs (whose head branch is neither `development` nor `main`), run this job
    if: ${{ needs.build.outputs.pr_nums }}
    runs-on: ubuntu-latest
    # Run the same job for each of the open PRs found
    strategy:
      matrix:
        pr_nums: ${{fromJson(needs.build.outputs.pr_nums)}}
    steps:
      - name: Get date
        run: echo "DATE=$(date '+%Y-%m-%d %H:%M %Z')" >> $GITHUB_ENV

      - name: Set pr-preview URL
        if: ${{github.event.action != 'closed'}}
        uses: thollander/actions-comment-pull-request@v2.4.3
        with:
          comment_tag: pr-preview
          pr_number: ${{ matrix.pr_nums }}
          message: "\
            PR Preview
              
            :---:

            🚀 Deployed preview to
            https://access-hive.org.au/pr-preview/pr-${{ matrix.pr_nums }}
            
            ${{ env.DATE }}
            "