#coding: utf-8
require 'fileutils'
module Ns
  module Util
    extend self 
    def concat_url(prefix_url='', url='')
      prefix_url = prefix_url.to_s
      sep = (prefix_url[-1, 1] == '/' || url[0, 1] == '/') ? '' : '/'
      "#{prefix_url}#{sep}#{url}"
    end
  
    #将一个hash和array写入data下的yaml结构中
    def self.yamlize(hash_or_array = {}, file_name = nil)
      return if hash_or_array.nil?
      hash = if hash_or_array.is_a?(Array)
        hash_or_array.inject({}) do |r, k|
          r[k] = nil
          r
        end
      else
        hash_or_array
      end

      method_key = file_name.nil? ? "hash" : file_name.to_s
      name = "#{method_key}_#{Time.now.to_i}"
      file = "#{Rails.root}/data/#{name}.yml"
      path = File.dirname(file)
      FileUtils.mkpath(path) unless File.directory?(path)
      File.open(file, 'w+') do |f|
        f.puts YAML.dump(method_key.to_sym=>hash)
      end
      puts "Generate a yaml file in #{file}"
      file
    end
  end
end