Sortkey collation using ilib

ilib.js

var _ = require('lodash');
var ilib = require('ilib');
var Locale = require('ilib/lib/Locale.js');
var Collator = require('ilib/lib/Collator.js');

var defaults = { locale: 'en', precision: 5 };

module.exports = {};
module.exports.ilib = ilib;
module.exports.Locale = Locale;
module.exports.Collator = Collator;
module.exports.defaults = defaults;

// See: http://docs.jedlsoft.com/ilib/jsdoc/index.html

module.exports.getAvailableLocales = function(callback) {
    if (_.isFunction(callback)) {
        Locale.getAvailableLocales(false, callback);
    } else {
        return Locale.getAvailableLocales();
    }
};

module.exports.getAvailableStyles = function(locale) {
    return Collator.getAvailableStyles(locale);
};

module.exports.getCollator = function(options) {
    if (_.isString(options)) options = { locale: options };
    return new Collator(_.defaults(options || {}, defaults));
};

Collator.prototype.hexSortKey = function(str, precision) {
    str = String(str);
    precision = precision || defaults.precision; // -1 = unlimited
    if (precision > 0) str = str.substr(0, precision);
    return new Buffer(this.sortKey(str), 'binary').toString('hex');
};