Google closure template for formatting numbers.

NumberFormat.soy

/**
 * Format number (integer).
 * @param n
 */
{template .formatNumber}
  {let $x: floor($n) /}
  {if $x >= 1000 and $x < 1000000000}
    {if $x < 1000000}
      {floor($x / 1000)},
    {else}
      {floor($x / 1000000)},
      {let $y: floor(($x % 1000000) / 1000) /}
      {if $y < 10}00
      {elseif $y < 100}0
      {/if}{$y},
    {/if}

    {let $z: $x % 1000 /}
    {if $z < 10}00
    {elseif $z < 100}0
    {/if}{$z}
  {else}
    {$x}
  {/if}
{/template}

see http://docs.closure-library.googlecode.com/git/class_goog_i18n_NumberFormat.html