class views_handler_argument_date

class views_handler_argument_date extends views_handler_argument_formula {
    var $option_name = 'default_argument_date';
    var $arg_format = 'Y-m-d';
    
    /**
     * Add an option to set the default value to the current date.
     */
    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.
     */
    function get_default_argument($raw = FALSE) {
        if (!$raw && $this->options['default_argument_type'] == 'date') {
            return date($this->arg_format, time());
        }
        else {
            if (!$raw && in_array($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();
                }
                else {
                    if ($this->options['default_argument_type'] == 'node_created') {
                        return date($this->arg_format, $node->created);
                    }
                    else {
                        if ($this->options['default_argument_type'] == 'node_changed') {
                            return date($this->arg_format, $node->changed);
                        }
                    }
                }
            }
        }
        return parent::get_default_argument($raw);
    }
    
    /**
     * The date handler provides some default argument types, which aren't argument default plugins,
     * so addapt the export mechanism.
     */
    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') {
            $type = 'argument default';
            $option_name = 'default_argument_options';
            $plugin = $this->get_plugin($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);
    }

}