index.js

'use strict';

var normalizeOpts = require('es5-ext/object/normalize-options')
  , resolveLength = require('./lib/resolve-length')
  , plain         = require('./plain');

module.exports = function (fn/*, options*/) {
	var options = normalizeOpts(arguments[1]), length;

	if (!options.normalizer) {
		length = options.length = resolveLength(options.length, fn.length, options.async);
		if (length !== 0) {
			if (options.primitive) {
				if (length === false) {
					options.normalizer = require('./normalizers/primitive');
				} else if (length > 1) {
					options.normalizer = require('./normalizers/get-primitive-fixed')(length);
				}
			} else {
				if (length === false) options.normalizer = require('./normalizers/get')();
				else if (length === 1) options.normalizer = require('./normalizers/get-1')();
				else options.normalizer = require('./normalizers/get-fixed')(length);
			}
		}
	}

	// Assure extensions
	if (options.async) require('./ext/async');
	if (options.dispose) require('./ext/dispose');
	if (options.maxAge) require('./ext/max-age');
	if (options.max) require('./ext/max');
	if (options.refCounter) require('./ext/ref-counter');

	return plain(fn, options);
};