AngularJs filter to truncate text

AngularTruncateText.js

    angular
      .module('ng')
      .filter('truncate', function () {
        /**
         * @param  {boolean} wordwise - if true, cut only by words bounds
         * @param  {string} max -  max length of the text, cut to this number of chars
         * @param  {string} tail - add this string to the input string if the string was cut
         */
        return function (value, wordwise, max, tail) {
            if (!value) return '';

            max = parseInt(max, 10);
            if (!max) return value;
            if (value.length <= max) return value;

            value = value.substr(0, max);
            if (wordwise) {
                var lastspace = value.lastIndexOf(' ');
                if (lastspace != -1) {
                  if (value.charAt(lastspace-1) == '.' || value.charAt(lastspace-1) == ',') {
                    lastspace = lastspace - 1;
                  }
                  value = value.substr(0, lastspace);
                }
            }
            return value + (tail || ' …');
        };
    });