List all routes of grape app and export to text file

grape_routes.rb

  desc 'Generate API Desc'
  task :api_desc => :environment do
=begin
 ___  ___  ___  ___      ___    ___ ________   ________      
|\  \|\  \|\  \|\  \    |\  \  /  /|\   ___  \|\   __  \     
\ \  \\\  \ \  \\\  \   \ \  \/  / | \  \\ \  \ \  \|\  \    
 \ \   __  \ \  \\\  \   \ \    / / \ \  \\ \  \ \  \\\  \   
  \ \  \ \  \ \  \\\  \   \/  /  /   \ \  \\ \  \ \  \\\  \  
   \ \__\ \__\ \_______\__/  / /      \ \__\\ \__\ \_____  \ 
    \|__|\|__|\|_______|\___/ /        \|__| \|__|\|___| \__\
                       \|___|/                          \|__|
=end
    routes = Api::Root::routes
    info = String.new
    f = File.new("api_routes.txt", 'wb')

    info << "#####################################################\n"
    info << "## Script Generate List of API on Grape-based app  ##\n"
    info << "## Author: HuyNQ (huy@huynq.net)                   ##\n"
    info << "## Date: 2014/04/01                                ##\n"
    info << "#####################################################\n\n\n"

    routes.count.times do |i|
      info << "#{i+1}. " << routes[i].route_description.to_s << "\n"
      info << "\t Params: " << "\n"
      routes[i].route_params.each do |k,_|
        info << "\t\t- " << k
        if routes[i].route_params[k].length > 0
          info << "\t Required: " << routes[i].route_params[k][:required].to_s
          info << "\t Type: #{routes[i].route_params[k][:type].to_s}"
          info << "\t Desc: #{routes[i].route_params[k][:desc].to_s if routes[i].route_params[k].length > 0} \n"
        end
      end

      info << "\t Method: " << routes[i].route_method.to_s << "\n"
      info << "\t Path: " << routes[i].route_path.to_s.gsub("(.:format)", "") << "\n\n"
    end
    f << info
    f.close
  end