Clone heroku environment variables to a .env file for foreman

heroku_env_clone.rake

desc "Clone heroku environment variables to a .env file for foreman'"
namespace :heroku do
  namespace :env do
    task :clone => :environment do
      ignore_list = [
        "DATABASE_URL",
        "GEM_PATH", 
        "LANG",
        "LOG_LEVEL"
        "PATH",
        "RACK_ENV",
        "RAILS_ENV",
        "SHARED_DATABASE_URL",
      ]
      puts 'Fetch heroku config'
      config = `heroku config`
      output = ''
      config.lines.each do |line|
        match = line.match(/([A-Z_]*)\s*=>\s*(\w*)/)
        next if ignore_list.include?(match[1])
        output << "#{match[1]}=#{match[2]}\n"
      end
      file = "#{Rails.root}/.env"
      puts "Outputting to #{file}"
      File.open(file, "w+") do |f|
        f.write(output)
      end
    end
  end
end