small Ruby helper for colorizing output

colors.rb

module Colors
  def self.fg_green(io=$stdout)
    io.print "\x1b[0;32m"
  end

  def self.fg_white(io=$stdout)
    io.print "\x1b[1;37m"
  end

  def self.fg_gray(io=$stdout)
    io.print "\x1b[1;90m"
  end

  def self.fg_yellow(io=$stdout)
    io.print "\x1b[0;33m"
  end

  def self.fg_red(io=$stdout)
    io.print "\x1b[0;31m"
  end

  def self.reset(io=$stdout)
    io.print "\x1b[0m"
  end

  def self.reset_at_exit
    at_exit do
      Colors.reset($stdout)
      Colors.reset($stderr)
    end
  end
end