console汎用クラス

console class

class Console
  # Class Methods
  class << self
    def gets_from_stdin(message = nil)
      print "#{message}: " unless message.nil?
      str = STDIN.gets.chomp
    end

    def get_y_or_n_from_stdin(message)
      bol = ""
      while !%w(Y N).include?(bol.upcase)
        bol = gets_from_stdin("#{message}(y/n)")
      end
      bol.upcase == "Y"
    end

    def show_item_with_pointer(iterator, console_print = true)
      rtn_hash = {}
      iterator.each_with_index do |value, idx|
        rtn_hash[idx.to_s] = value
        if console_print
          if value.is_a?(AWS::S3::Bucket)
            p "[" + (idx).to_s + "] " + value.name.to_s
          else
            p "[" + (idx).to_s + "] " + value
          end
        end
      end

      rtn_hash
    end

    def progress_bar(i, max = 100)
      i = i.to_f
      max = max.to_f
      i = max if i > max
      percent = i / max * 100.0
      rest_size = 1 + 5 + 1 # space + progress_num + %
      bar_size = 79 - rest_size # (width - 1) - rest_size
      bar_str = '%-*s' % [bar_size, ('#' * (percent * bar_size / 100).to_i)]
      progress_num = '%3.1f' % percent
      print "\r#{bar_str} #{'%5s' % progress_num}%"
    end

    def print_green(str)
      puts "\e[32m#{str}\e[0m"
    end

    def print_red(str)
      puts "\e[31m#{str}\e[0m"
    end
    
    def print_yellow(str)
      puts "\e[33m#{str}\e[0m"
    end
    
    def display_with_arrow(&block)
      arrow_thread = Thread.start{
                                  arrow_progress = %w(> >> >>>).cycle
                                  loop{
                                    print "\r file reading #{sprintf("%-\s3s",arrow_progress.next)}"
                                    sleep 1
                                  }
                                }

      rtn = block.call
      Thread.kill(arrow_thread)
      rtn
    end
  end # Class Methods End
end