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<?php
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// $Id: pivots_block.module,v 1.18 2009/09/08 20:13:24 danithaca Exp $
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/**
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* @file
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* This file provides the pivots_blocks that generates module recommendations.
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*
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* Current limitations/issues:
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* 1. Recommendation data is stored externally on master-other.drupal.org database.
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* The reason to use external database is to give flexibility to developers to tweak the algorithm.
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* 2. "More" is disabled temporarily to make the code clearer, will be added later if needed.
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*
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* This module was developed with support from the National Science
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* Foundatio under award IIS-0812042. Any opinions, findings, and conclusions
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* or recommendations expressed or embodied in this software are those of the
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* author(s) and do not necessarily reflect the views of the National Science
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* Foundation.
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*/
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define('PID_CONVERSATION', 4151); // conversation pivot algorithm ID that displays related conversations
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define('PID_DOUBLE', 5001); // double pivot algorithm ID that displays related projects in different algorithms.
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define('LIMIT_CONVERSATION', 5);
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define('LIMIT_DOUBLE', 5);
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define('LIMIT_MAX', 100); // maximum items to display in the block or on a page.
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function pivots_block_output() {
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if ($node = project_get_project_from_menu()) {
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//HACK: randomize algorithm rotation
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global $_pivots_block_pid_double; // double pivot ID defaults to conversation pivots
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switch (rand(0,1)) {
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case 0:
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$_pivots_block_pid_double = 5001; // conversation pivots
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break;
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case 1:
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$_pivots_block_pid_double = 5002; // solr10
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break;
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}
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$output = _pivots_block_display_on_project($node->nid);
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return $output;
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}
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}
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function _pivots_block_display_on_project($node_id) {
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global $_pivots_block_pid_double;
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$output = '';
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$output .= _pivots_block_content($node_id, PID_CONVERSATION, t("Related discussions"), LIMIT_CONVERSATION);
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$output .= _pivots_block_content($node_id, $_pivots_block_pid_double, t("Related projects"), LIMIT_DOUBLE);
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return $output;
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}
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function _pivots_block_display_on_forum($node_id) {
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$output = '';
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$output = _pivots_block_content($node_id, PID_CONVERSATION, t("Projects mentioned in the discussion"), LIMIT_CONVERSATION);
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return $output;
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}
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function _pivots_block_content($node_id, $pivot_id, $title, $limit) {
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$output = '';
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$ga_event = "$node_id";
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$items = _pivots_block_generate_items($node_id, $pivot_id, $limit);
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if (!empty($items)) {
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foreach ($items as $position => $item) {
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$items[$position] = l($item['title'], "node/{$item['nid']}", array( 'attributes' => array(
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"onClick" => "javascript:pageTracker._trackEvent('PivotsClick_${pivot_id}', '${node_id}_{$item['nid']}');"
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)));
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$ga_event .= "_{$item['nid']}";
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}
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$output = theme('item_list', $items, $title);
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}
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$GLOBALS['conf']['googleanalytics_codesnippet_after'] .= "pageTracker._trackEvent('PivotsPageview_{$pivot_id}', '{$ga_event}');";
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return $output;
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}
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function _pivots_block_generate_items($node_id, $pivot_id, $limit) {
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if ($limit <= 0) {
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$limit = LIMIT_MAX;
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}
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db_set_active('pivots'); // NOTE: here we activate the pivots database.
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// if there's database failure, we just pretend nothing happens whatsoever. pivots_block returns nothing in this case.
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$matches = @db_query("SELECT DISTINCT dest_id FROM {pivots_match} WHERE pivot_id=%d AND src_id=%d
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AND dest_id<>%d ORDER BY score DESC", $pivot_id, $node_id, $node_id);
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db_set_active(); // NOTE: change back to use the default database
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$count = 0;
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$items = array();
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while (($match = @db_fetch_array($matches)) && $count < $limit) {
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$dest_id = $match['dest_id'];
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$result = db_query("SELECT title FROM {node} WHERE nid=%d AND status=1", $dest_id);
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// there might be cases that the node was deleted, or set to unpublished between pivots database refresh
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// so here we only count the valid node.
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$title = db_result($result);
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if ($title) {
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$items[] = array('nid' => $dest_id, 'title' => $title, 'pid' => $pivot_id);
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$count++;
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}
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}
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return $items;
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}
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/**
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* Implementation of hook_block()
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*/
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function pivots_block_block($op = 'list', $delta = 0, $edit = array()) {
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switch ($op) {
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case 'list':
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$blocks[0]['info'] = t('pivots_block: Recommendations');
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return $blocks;
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case 'view':
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$block['subject'] = t('Recommendations');
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$block['content'] = pivots_block_output();
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return $block;
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}
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}
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