class views_handler_argument_date

class views_handler_argument_date extends views_handler_argument_formula {
    
    /**
     * @var string
     */
    public $option_name = 'default_argument_date';
    
    /**
     * @var string
     */
    public $arg_format = 'Y-m-d';
    
    /**
     * Add an option to set the default value to the current date.
     */
    public function default_argument_form(&$form, &$form_state) {
        parent::default_argument_form($form, $form_state);
        $form['default_argument_type']['#options'] += array(
            'date' => t('Current date'),
        );
        $form['default_argument_type']['#options'] += array(
            'node_created' => t("Current node's creation time"),
        );
        $form['default_argument_type']['#options'] += array(
            'node_changed' => t("Current node's update time"),
        );
    }
    
    /**
     * Set the empty argument value to the current date.
     *
     * Formatted appropriately for this argument.
     *
     * @return string
     *   The default argument.
     */
    public function get_default_argument($raw = FALSE) {
        if (!$raw && $this->options['default_argument_type'] == 'date') {
            return date($this->arg_format, REQUEST_TIME);
        }
        elseif (!$raw && in_array($this->options['default_argument_type'], array(
            'node_created',
            'node_changed',
        ))) {
            foreach (range(1, 3) as $i) {
                $node = menu_get_object('node', $i);
                if (!empty($node)) {
                    continue;
                }
            }
            if (arg(0) == 'node' && is_numeric(arg(1))) {
                $node = node_load(arg(1));
            }
            if (empty($node)) {
                return parent::get_default_argument();
            }
            elseif ($this->options['default_argument_type'] == 'node_created') {
                return date($this->arg_format, $node->created);
            }
            elseif ($this->options['default_argument_type'] == 'node_changed') {
                return date($this->arg_format, $node->changed);
            }
        }
        return parent::get_default_argument($raw);
    }
    
    /**
     * Adapt the export mechanism.
     *
     * The date handler provides some default argument types, which aren't
     * argument default plugins.
     */
    public function export_plugin($indent, $prefix, $storage, $option, $definition, $parents) {
        // Only use a special behaviour for the special argument types, else just
        // use the default behaviour.
        if ($option == 'default_argument_type') {
            $name = $this->options[$option];
            if (in_array($name, array(
                'date',
                'node_created',
                'node_changed',
            ))) {
                // Write which plugin to use.
                $output = $indent . $prefix . "['{$option}'] = '{$name}';\n";
                return $output;
            }
        }
        return parent::export_plugin($indent, $prefix, $storage, $option, $definition, $parents);
    }
    
    /**
     * {@inheritdoc}
     */
    public function get_sort_name() {
        return t('Date', array(), array(
            'context' => 'Sort order',
        ));
    }

}