%div{ ng: { show: "data.length > limit" } }
  %input{ type: 'button', value: t(:show_more), ng: { click: 'limit = limit + increment' } }
  or
  %input{ type: 'button', value: t(:show_all_with_more, num: '{{ data.length - limit }}'), ng: { click: 'limit = data.length' } }