awesomeness.rb

require 'term/ansicolor'

module Awesomeness
  def self.included(base)
    base.extend ClassMethods
    base.send :include, Term::ANSIColor
  end

  def format_message(message)
    whitelist = %w(red green yellow black blue magenta cyan white dark underscore blink negative concealed)
    message.gsub(/%([a-z]+)%{([^}]+)}/) {
      if whitelist.include?($1)
        send($1, $2)
      else
        $2
      end
    }
  end
end

__END__

format_message "Yo %blink%{Nathan}!"