preview-theme.yml

name: Preview Theme Changes

on:
  pull_request:

jobs:
  check-for-changes-to-themes:
    runs-on: ubuntu-latest
    steps:
      - name: Check if PR is from a fork
        run: |
          if [ "${{ github.event.pull_request.head.repo.fork }}" == "true" ]; then
            echo "This pull request is from a fork. Skipping the action."
            exit 0
          fi
      - name: Checkout PR Head
        uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
      - name: Retrieved Theme Changes
        id: check-for-changes
        run: |
          # Retrieve list of all changed files
          git fetch origin ${{ github.event.pull_request.base.ref }}:${{ github.event.pull_request.base.ref }}
          changed_files=$(git diff --name-only HEAD origin/${{ github.event.pull_request.base.ref }})
          
          # Loop through changed files and identify parent directories
          declare -A unique_dirs
          for file in $changed_files; do
            dir_name=$(dirname "$file")
            while [[ "$dir_name" != "." ]]; do
              if [[ -f "$dir_name/style.css" ]]; then  # Check if the parent directory contains a theme
                # Save only the basename
                unique_dirs[$dir_name]=$(basename $dir_name)
                break
              fi
              dir_name=$(dirname "$dir_name")
            done
          done
          # Check if themes have changed
          if [[ ${#unique_dirs[@]} -eq 0 ]]; then
              echo "No theme changes detected"
              echo "HAS_THEME_CHANGES=false" >> $GITHUB_OUTPUT
              exit 0 # Use exit code 0 for successful completion
          fi
          # Output list of theme slugs with changes
          echo "HAS_THEME_CHANGES=true" >> $GITHUB_OUTPUT
          echo "CHANGED_THEMES=$(echo ${unique_dirs[@]})" >> $GITHUB_ENV
          echo "Theme directories with changes: $CHANGED_THEMES"
      - name: Add Preview Links comment
        id: comment-on-pr
        if: ${{ steps.check-for-changes.outputs.HAS_THEME_CHANGES == 'true' }}
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const createPreviewLinks = require('.github/scripts/create-preview-links');
            createPreviewLinks(github, context, process.env.CHANGED_THEMES);
      - name: Remove comment if no changes are detected
        if: ${{ steps.check-for-changes.outputs.HAS_THEME_CHANGES == 'false' }}
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const { data: comments } = await github.rest.issues.listComments({
              issue_number: context.payload.pull_request.number,
              owner: context.repo.owner,
              repo: context.repo.repo
            });
            
            const existingComment = comments.find(comment => comment.user.login === 'github-actions[bot]' && comment.body.startsWith('### Preview changes'));
            
            if (existingComment) {
              await github.rest.issues.deleteComment({
                comment_id: existingComment.id,
                owner: context.repo.owner,
                repo: context.repo.repo
              });
            }