utils.js

const unidecode = require('unidecode')
function safeString (string, options) {
  options = options || {};

  if (string === null) {
    string = '';
  }

  // Handle the £ symbol separately, since it needs to be removed before the unicode conversion.
  string = string.replace(/£/g, '-');

  // Remove non ascii characters
  string = unidecode(string);

  // Replace URL reserved chars: `@:/?#[]!$&()*+,;=` as well as `\%<>|^~£"{}` and \`
  string = string.replace(/(\s|\.|@|:|\/|\?|#|\[|\]|!|\$|&|\(|\)|\*|\+|,|;|=|\\|%|<|>|\||\^|~|"|\{|\}|`|–|—)/g, '-')
    // Remove apostrophes
    .replace(/'/g, '')
    // Make the whole thing lowercase
    .toLowerCase();

  // We do not need to make the following changes when importing data
  if ((!options.hasOwnProperty('importing')) || !options.importing) {
    // Convert 2 or more dashes into a single dash
    string = string.replace(/-+/g, '-')
      // Remove trailing dash
      .replace(/-$/, '')
      // Remove any dashes at the beginning
      .replace(/^-/, '');
  }

  // Handle whitespace at the beginning or end.
  string = string.trim();

  return string;
}

function joinUrl() {
    var origin = arguments[0]
    var paths = Array.prototype.slice.call(arguments, 1)
    return origin + ( origin[origin.length - 1] == '/' ? '' : '/' ) +  paths.map(function (item) {
        return item.replace(/^\//, '').replace(/\/$/, '')
    }).join('/')
}

module.exports = {
    safeString,
    joinUrl,
}