class Utils::Editor

def cmd(*parts)
  command = parts.compact.inject([]) do |a, p|
    case
    when p == nil, p == []
      a
    when p.respond_to?(:to_ary)
      a.concat p.to_ary
    else
      a << p.to_s
    end
  end
  $DEBUG and warn command * ' '
  system(*command.map(&:to_s))
end