<?php
/**
* Handler for showing comment module's node link.
 */
class views_handler_field_comment_node_link extends views_handler_field {
  function construct() {
    parent::construct();
    
    // Add the node fields that comment_link will need..
    $this->additional_fields['nid'] = array(
      'table' => 'node', 
      'field' => 'nid',
    );      
    $this->additional_fields['type'] = array(
      'table' => 'node', 
      'field' => 'type',
    );      
    $this->additional_fields['comment'] = array(
      'table' => 'node', 
      'field' => 'comment',
    );      
  }

  function option_definition() {
    $options = parent::option_definition();
    $options['teaser'] = array('default' => 0);
    return $options;
  }

  function options_form(&$form, &$form_state) {
    parent::options_form($form, $form_state);
    
    $form['teaser'] = array(
      '#type' => 'checkbox',
      '#title' => t('Show teaser-style link'),
      '#default_value' => $this->options['teaser'],
      '#description' => 'Show the comment link in the form used on standard node teasers, rather than the full node form.',
    );
    
  }

  function query() {
    $this->ensure_my_table();
    $this->add_additional_fields();
  }

  function render($values) {
    // Build fake $node.
    $node = new stdClass();
    $node->nid      = $values->{$this->aliases['nid']};
    $node->type     = $values->{$this->aliases['type']};
    $node->comment  = $values->{$this->aliases['comment']};
    
    // Call comment.module's hook_link: comment_link($type, $node = NULL, $teaser = FALSE) 
    $links = comment_link('node', $node, $this->options['teaser']); 
    // question: should we run these through:    drupal_alter('link', $links, $node);
    // might this have unexpected consequences if these hooks expect items in $node that we don't have?

    return !empty($links) ? theme('links', $links, array('class' => 'links inline')) : '';
  }
}