# File lib/sup/colormap.rb, line 69
  def add sym, fg, bg, attr=nil, opts={}
    raise ArgumentError, "color for #{sym} already defined" if @entries.member? sym
    raise ArgumentError, "color '#{fg}' unknown" unless CURSES_COLORS.include? fg
    raise ArgumentError, "color '#{bg}' unknown" unless CURSES_COLORS.include? bg
    attrs = [attr].flatten.compact

    @entries[sym] = [fg, bg, attrs, nil]
    @entries[highlight_sym(sym)] = opts[:highlight] ? @entries[opts[:highlight]] : highlight_for(fg, bg, attrs) + [nil]
  end