如何给Rails控制台IRB提示符着色？

gem 'pry'

if defined?(Rails::Console)
  Pry.config.prompt = Pry::Prompt.new(
    :rails,
    'Rails prompt with color',
    [
      proc { |*a| "\e[1;32mrails:\e[0m#{Pry.config.prompt_name}#{Pry::Prompt::DEFAULT_DELIMITER} " },
      proc { |*a| "\e[1;32mrails:\e[0m#{Pry.config.prompt_name}#{Pry::Prompt::DEFAULT_DELIMITER} " }
    ]
  )
end