Module teaser.module

Have been playing with 'Contaires' teaser.module and thought I should report how I managed to install and implement it.

First, the install doesn't have a teaser.mysql to support the modifications to the node table required for the module to function. You need to modify the table "node" and add the following six columns

teaser_title varChar(100)
teaser_link varChar(100)
teaser_weight tinyInt(4)
teaser_image varChar(255)
teaser_image_width tinyInt(6)
teaser_image_height tinyInt(6)

or in MYSQL

ALTER TABLE `node` ADD `teaser_title` VARCHAR( 255 ) NOT NULL ;
ALTER TABLE `node` ADD `teaser_link` VARCHAR( 255 ) NOT NULL ;
ALTER TABLE `node` ADD `teaser_weight` VARCHAR( 255 ) NOT NULL ;
ALTER TABLE `node` ADD `teaser_image` TINYINT( 4 ) NOT NULL ;
ALTER TABLE `node` ADD `teaser_image_width` TINYINT( 6 ) NOT NULL ;
ALTER TABLE `node` ADD `teaser_image_height` TINYINT( 6 ) NOT NULL ;

Having done this the module installs successfully and users can now add nodes with extra teaser information.

Second, I then modified the module slightly so that the drupal coulmn node.teaser was also made visible as part of the node editing window. This will then allow you to modify the teaser text that drupal creates as standard - drupal chops first X chars of the content and puts that into the teaser field, but for our implementation we needed to have a customised input. I have altered the function "teaser_nodeapi", the changed function is listed below:

function teaser_nodeapi(&$node, $op, $teaser, $page) {
  static $teaser_count = 0;
  switch ($op) {
    case 'settings':
      $settings = array();
      $settings[t('contaire')] = form_checkbox('', 'teaser_'. $node->type, 1, variable_get('teaser_'. $node->type, TRUE));
      return $settings; 

    case 'fields':
      return array('teaser_title', 'teaser', 'teaser_image', 'teaser_link', 'teaser_image_width', 'teaser_image_height', 'teaser_weight');

    case 'form post':
      if (variable_get('teaser_'. $node->type, TRUE)) {
        $form .= form_textfield(t("Title"), "teaser_title", $node->teaser_title, 90, 128, t(""));
        $form .= form_textarea(t("Text"), "teaser", $node->teaser, 90, 6, t(""));
        $form .= form_textfield(t("Image"), "teaser_image", $node->teaser_image, 90, 128, t("The image filename, relative to the image directory."));
        $form .= form_textfield(t("Link"), "teaser_link", $node->teaser_link, 90, 128, t("Link that replaces the usual 'read more' link."));
        $form .= form_weight(t('Weight'), 'teaser_weight', $node->teaser_weight, 15, t('Teasers at a given level are ordered first by weight and then by title.'));
        return '<div class="contaire-form">' . form_group(t("Teaser"), $form) . '</div>';
      }
      return '';

    case 'view':
      if ($teaser && variable_get('teaser_'. $node->type, TRUE)) {
        if ($node->teaser_title) {
          $node->title = $node->teaser_title;
        }
        $align = ($teaser_count++ % 2) ? 'even' : 'odd';
        if ($node->teaser_image) {
          $node->teaser = '<img class="teaser-image-' . $align . '" src="/images/' . $node->teaser_image . '" width="' . $node->teaser_image_width . '" height="' . $node->teaser_image_height . '" alt="" />' . $node->teaser;
        }
        if ($node->teaser_link) {
          unset($node->readmore);
          $node->links[] = l(t('read more'), $node->teaser_link);
        }
      }
      break;

    case 'validate':
      if (variable_get('teaser_'. $node->type, TRUE)) {
        if ($node->teaser_image) {
          //$teaser_image = 'images/' . $node->teaser_image;
          $teaser_image = 'files/images/' . $node->teaser_image;
          if (file_exists($teaser_image)) {
            $size = getimagesize($teaser_image);
            $node->teaser_image_width = $size[0];
            $node->teaser_image_height = $size[1];
          }
          else {
            form_set_error('teaser_' . $node->type, t('The teaser image must exist')); 
          }
        }
      }
      break;
  }

Last, I wanted to display the teasers for the last 5 stories created in a block on the front page as part of a side bar. To do this we created a new block and changed the Input format to PHP code, and pasted the following into the Block Body:

$nlimit = 5;
$type = "story";
$result = db_query_range(db_prefix_tables("SELECT n.created, n.title, n.nid, n.changed,n.teaser_title,n.teaser_link,n.teaser, n.teaser_image
FROM {node} n
WHERE n.type = '$type'
AND n.teaser_title != ''
ORDER BY n.changed
DESC "), 0, $nlimit);
$output .= "<ul>";
while ($node = db_fetch_object($result)) {
$output .= "<li>".theme('node', $node, $teaser = TRUE, $page = FALSE);
$output .= theme('image', 'files/images/'.$node->teaser_image, $node->teaser_title, $node->teaser_image, $attributes = NULL, $getsize = TRUE);
$output .= "</li>";
}
$output .= "</ul>";
print $output;

This will then give you a block with the last 5 stories with teaser title / node as a link / teaser text / teaser image. Its then up to you to CSS and theme it.

To summarise the teaser.module requires a fair bit of tidying, I am going to atempt this whilst developing the project I am working on and will post my results at a later date. Hope the above helps somebody