sync_engine_entrypoints_with_host_application.rb

namespace :hulk do
  desc 'Updates the host applications\' packs (new: entry_points) published from engines'
  task :publish_engine_packs do
    detected_missing_entry_points = 0

    puts "\n"

    Dir[Rails.root.join('engines/*/app/javascript/host_entrypoints/*.js')].each do |engine_entry_point|
      relative_entrypoint_path = engine_entry_point.sub("#{Rails.root}/", '')

      matcher = relative_entrypoint_path.match(/^engines\/([^\/]+).*host_entrypoints\/([^\/]+\.js)$/)
      engine_name, entry_point = matcher[1], matcher[2]

      host_dest_path = Rails.root.join('app/javascript/packs', engine_name, entry_point)

      next if File.exist?(host_dest_path) || File.exist?("#{host_dest_path}.skip")

      detected_missing_entry_points += 1
      File.open(host_dest_path, 'w') do |f|
        f << "// publish engine's pack: #{entry_point}\n"
        f << "// (rename it to #{entry_point}.skip to prevent this pack to be published\n\n"
        f << "require('#{relative_entrypoint_path.sub(/^engines\//, '')}')\n"
      end

      puts "Created new host entry_point for engine: #{engine_name} entry_point: #{entry_point}"
    end

    if detected_missing_entry_points.zero?
      puts 'No missing entry_points detected in loaded engines.'
    else
      puts "\nDetected (and added) #{detected_missing_entry_points} missing entry_points in engines."
    end

    puts "\n\nchecking for obsolete ones..."
    Rake::Task['hulk:remove_unpublished_engine_packs'].invoke
  end

  desc 'Removes host applications\' packs from engine entry_points, which aren\'t available anymore'
  task :remove_unpublished_engine_packs do
    if (real_run = ENV['REAL_RUN'] == '1')
      puts 'Real run'
    end

    obsolete_detections = false

    Dir[Rails.root.join('app/javascript/packs/*/*')].each do |host_entry_point|
      published_entry_point_file = host_entry_point

      host_entry_point = host_entry_point.sub(/\.skip$/, '') if host_entry_point.match(/\.skip$/)

      matcher = host_entry_point.match(/\/packs\/([^\/]+)\/([^\/]+\.js)$/)
      engine_name, entry_point = matcher[1], matcher[2]

      next if File.exist?(Rails.root.join("engines/#{engine_name}/app/javascript/host_entrypoints/#{entry_point}"))

      obsolete_detections = true
      puts "Detected obsolete entry_point publication in engine: #{engine_name}, host_entrypoint: #{entry_point}"

      if real_run
        FileUtils.rm_rf(published_entry_point_file)
        puts "\tdeleted: #{published_entry_point_file}"
      end
    end

    if obsolete_detections
      unless real_run
        puts "\nThe obsolete host entry_points were detected in a dry run."
        puts 'To delete them call:'
        puts "$ rails hulk:remove_unpublished_engine_packs REAL_RUN=1\n\n"
      end
    else
      puts 'No obsolete publications found for active engines.'
    end
  end
end