<?php
class SluggableBehavior extends ModelBehavior {
/**
 * Defaults
 *
 * @var array
 * @access protected
 */
	var $_defaults = array(
		'seperator' => '-',
		'label' => 'title',
		'field' => 'slug',
		'extension' => '.html',
		'length' => 100,
		'overwrite' => false
	);
/**
 * Initiate Sluggable behavior
 *
 * @param object $Model instance of model
 * @param array $config array of configuration settings.
 * @return void
 * @access public
 */
    function setup(&$Model, $config = array()) {
        $settings = array_merge($this->_defaults, $config);
        $this->_settings[$Model->alias] = $settings;
	}
/**
 * Before save method. Called before all saves
 *
 * Overriden to transparently manage creating and populating the slug field
 *
 * @param AppModel $Model Model instance
 * @return boolean true to continue, false to abort the save
 * @access public
 */
	function beforeSave(&$Model) {
		extract($this->_settings[$Model->alias]);

		if(!empty($Model->data[$Model->alias][$Model->primaryKey]) && !$overwrite) {
			return true;
		}

		if(!is_array($label) && empty($Model->data[$Model->alias][$label])) {
			return false;
		}

		if(is_array($label)) {
			$slug = '';
			foreach($label as $key) {
				$slug .= ife(!empty($slug), ' ', '') . $Model->data[$Model->alias][$key];
			}
		} else {
			$slug = $Model->data[$Model->alias][$label];
		}

		$slug = Inflector::slug($slug, $seperator);
		$slug = low($slug);

		if(strlen($slug) > $length) {
			$slug = substr($slug, 0, $length-1);
		}

		if(!empty($extension)) {
			$slug = $slug . $extension;
		}

		$i = 1;
		while($Model->find('count', array('conditions' => array($Model->alias . '.' . $field => $slug))) != 0) {
			if (!preg_match ('/'.preg_quote($seperator).'{1}[0-9]+$/', $slug)) {
				if(!empty($extension)) {
					$slug = $slug . $seperator . ++$i . $extension;
				} else {
					$slug = $slug . $seperator . ++$i;
				}
			} else {
				$slug = preg_replace('/[0-9]+$/', ++$i, $slug);
			}
		}

		$Model->data[$Model->alias][$field] = $slug;

		return parent::beforeSave($Model);
	}
}
?>

	var $actsAs = array(
		'Sluggable' => array(
			'label' => 'name',
			'extension' => false
		)
	);

// or

	var $actsAs = array('Sluggable');