Shorten long text, add ellipsis

shorten.js

/**
 * Shorten long text, add ellipsis.
 * @param  {String}  text
 * @param  {Number}  maxLength
 * @return {String}
 */
function shorten(text, maxLength) {
  maxLength = maxLength || 220;
  
  if (text.length <= maxLength) {
    return text;
  }

  text = text.substr(0, maxLength);

  // If text ends in whitespace, trim
  if (/^\S/.test(text.substr(maxLength))) {
    text = text.replace(/\s+\S*$/, '');
  }

  // Remove trailing punctuation
  text = text.replace(/[^a-zA-Z]+$/, '');

  return text + '...';
}