Add formatter for trimmed plain text

It would be very nice if this module added the same functionality for a plain text formatter. Drupal itself adds a "Plain text" and a "Trimmed" formatter, but not the combination. Sounds like something Smart Trim might do.

This is what I did in custom code:

<?php

/**
 * Implements hook_field_formatter_view().
 */
function YOURMOD_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array();

  switch ($display['type']) {
    case 'text_plain_trimmed':
      $trim_length = $display['settings']['trim_length'];

      foreach ($items as $delta => $item) {
        $text = trim($item['value']);
        $text = strip_tags($text);
        $text = preg_replace('#\s+#', ' ', $text);
        if (drupal_strlen($text) > $trim_length) {
          $text = trim(truncate_utf8($text, $trim_length)) . '...';
        }
        $element[$delta] = array('#markup' => $text);
      }
      break;
  }

  return $element;
}

?>

I named the formatter "text_plain_trimmed" because text.module checks for 'starts with "text_"' for a few handy things.

Is that an idea?

You might want to add more options to make it actually Smart.