add_google_play_changelog.rb

desc "Add google play changelog"
private_lane :add_google_play_changelog do |options|
    root_changelog = File.read("../CHANGELOG")
    log = root_changelog.split("##")
    version_code = options[:version_code] or 0
    version_name = options[:version_name] or ""
    current_log = log[0]
    if current_log.nil?
      puts "Invalid: No root changelog found!"
    else
      changelog_dir = "#{Dir.pwd}/metadata/android/en-US/changelogs"
      Dir.mkdir(changelog_dir) unless Dir.exist?(changelog_dir)
      if File.directory?(changelog_dir)
        new_changelog = "#{changelog_dir}/#{version_code}.txt"
        puts "Creating new changelog: #{new_changelog}"
        unless version_code.nil? || version_code == 0
            begin
              file = File.new(new_changelog, 'w+')
              file.puts(current_log)
            puts "Success: #{version_code}.txt changelog created"
            rescue IOError => e
              #some error occur, dir not writable etc.
              puts e
            ensure
              file.close unless file.nil?
            end
        else
            puts "Invalid: Version code"
        end
      else
        puts "Directory does not exists: #{changelog_dir}"
      end
    end
end

# Sample usage
# can use GRADLE_ALL_OUTPUT_JSON_OUTPUT_PATHS is now supported https://github.com/fastlane/fastlane/releases/tag/2.131.0
lane_context[SharedValues::GRADLE_ALL_APK_OUTPUT_PATHS].each do | apk |
  output = load_json(json_path: File.dirname(apk) + "/output.json" )
  puts output
  apk_data = output[0]["apkData"]
  version_name =  apk_data["versionName"]
  version_code =  apk_data["versionCode"]
  add_google_play_changelog(
     version_code: version_code,
     version_name: version_name
  )
end