/**
 * Truncate a string to the given length, appending ellipses if necessary.
 *
 * @param {String} string
 * @param {Number} length
 * @param {Number} [start=0]
 * @return {String}
 */
export function truncate(string, length, start = 0) {
  return (start > 0 ? '...' : '') +
    string.substring(start, start + length) +
    (string.length > start + length ? '...' : '');
}

/**
 * Create a slug out of the given string. Non-alphanumeric characters are
 * converted to hyphens.
 *
 * @param {String} string
 * @return {String}
 */
export function slug(string) {
  return string.toLowerCase()
    .replace(/[^a-z0-9]/gi, '-')
    .replace(/-+/g, '-')
    .replace(/-$|^-/g, '') || '-';
}

/**
 * Strip HTML tags and quotes out of the given string, replacing them with
 * meaningful punctuation.
 *
 * @param {String} string
 * @return {String}
 */
export function getPlainContent(string) {
  return $('<div/>').html(string.replace(/(<\/p>|<br>)/g, '$1 ')).text();
}

/**
 * Make a string's first character uppercase.
 *
 * @param {String} string
 * @return {String}
 */
export function ucfirst(string) {
  return string.substr(0, 1).toUpperCase() + string.substr(1);
}