First commit

modules/comment/comment.api.php

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+<?php
+
+/**
+ * @file
+ * Hooks provided by the Comment module.
+ */
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * The comment passed validation and is about to be saved.
+ *
+ * Modules may make changes to the comment before it is saved to the database.
+ *
+ * @param $comment
+ *   The comment object.
+ */
+function hook_comment_presave($comment) {
+  // Remove leading & trailing spaces from the comment subject.
+  $comment->subject = trim($comment->subject);
+}
+
+/**
+ * The comment is being inserted.
+ *
+ * @param $comment
+ *   The comment object.
+ */
+function hook_comment_insert($comment) {
+  // Reindex the node when comments are added.
+  search_touch_node($comment->nid);
+}
+
+/**
+ * The comment is being updated.
+ *
+ * @param $comment
+ *   The comment object.
+ */
+function hook_comment_update($comment) {
+  // Reindex the node when comments are updated.
+  search_touch_node($comment->nid);
+}
+
+/**
+ * Comments are being loaded from the database.
+ *
+ * @param $comments
+ *  An array of comment objects indexed by cid.
+ */
+function hook_comment_load($comments) {
+  $result = db_query('SELECT cid, foo FROM {mytable} WHERE cid IN (:cids)', array(':cids' => array_keys($comments)));
+  foreach ($result as $record) {
+    $comments[$record->cid]->foo = $record->foo;
+  }
+}
+
+/**
+ * The comment is being viewed. This hook can be used to add additional data to the comment before theming.
+ *
+ * @param $comment
+ *   Passes in the comment the action is being performed on.
+ * @param $view_mode
+ *   View mode, e.g. 'full', 'teaser'...
+ * @param $langcode
+ *   The language code used for rendering.
+ *
+ * @see hook_entity_view()
+ */
+function hook_comment_view($comment, $view_mode, $langcode) {
+  // how old is the comment
+  $comment->time_ago = time() - $comment->changed;
+}
+
+/**
+ * The comment was built; the module may modify the structured content.
+ *
+ * This hook is called after the content has been assembled in a structured array
+ * and may be used for doing processing which requires that the complete comment
+ * content structure has been built.
+ *
+ * If the module wishes to act on the rendered HTML of the comment rather than the
+ * structured content array, it may use this hook to add a #post_render callback.
+ * Alternatively, it could also implement hook_preprocess_comment(). See
+ * drupal_render() and theme() documentation respectively for details.
+ *
+ * @param $build
+ *   A renderable array representing the comment.
+ *
+ * @see comment_view()
+ * @see hook_entity_view_alter()
+ */
+function hook_comment_view_alter(&$build) {
+  // Check for the existence of a field added by another module.
+  if ($build['#view_mode'] == 'full' && isset($build['an_additional_field'])) {
+    // Change its weight.
+    $build['an_additional_field']['#weight'] = -10;
+  }
+
+  // Add a #post_render callback to act on the rendered HTML of the comment.
+  $build['#post_render'][] = 'my_module_comment_post_render';
+}
+
+/**
+ * The comment is being published by the moderator.
+ *
+ * @param $comment
+ *   Passes in the comment the action is being performed on.
+ * @return
+ *   Nothing.
+ */
+function hook_comment_publish($comment) {
+  drupal_set_message(t('Comment: @subject has been published', array('@subject' => $comment->subject)));
+}
+
+/**
+ * The comment is being unpublished by the moderator.
+ *
+ * @param $comment
+ *   Passes in the comment the action is being performed on.
+ * @return
+ *   Nothing.
+ */
+function hook_comment_unpublish($comment) {
+  drupal_set_message(t('Comment: @subject has been unpublished', array('@subject' => $comment->subject)));
+}
+
+/**
+ * The comment is being deleted by the moderator.
+ *
+ * @param $comment
+ *   Passes in the comment the action is being performed on.
+ * @return
+ *   Nothing.
+ */
+function hook_comment_delete($comment) {
+  drupal_set_message(t('Comment: @subject has been deleted', array('@subject' => $comment->subject)));
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */