class BlankSlate
  instance_methods.each { |m| undef_method m unless m =~ /^__/ or m =~ /send/ }
end

class Gestalt < BlankSlate
  def initialize
    @cache = ''
  end

  def method_missing meth, *args, &block
    _gestalt_handle meth, *args, &block
  end

  def p *args, &block
    _gestalt_handle :p, *args, &block
  end

  def _gestalt_handle meth, *args, &block
    _gestalt_build_tag(meth, *args, &block)
  end

  # build a tag for `name`, using `args` and an optional block that
  # will be yielded
  def _gestalt_build_tag(name, args=nil, &block)
    @cache << "<#{name}"
    if block_given?
      @cache << ( args ? args.inject(''){ |s,v| s+%{ #{v[0]}="#{v[1]}"} } : '' )
      @cache << ">"
      tmp = yield
      @cache << tmp unless @cache.include? tmp.to_s
      @cache << "</#{name}>"
    else
      @cache << args.inject(''){ |s,v| s+%{ #{v[0]}="#{v[1]}"} } if args
      @cache << ' />'
    end
    @cache
  end
end