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<?php
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// $Id: taxonomy_browser.module,v 1.18 2007/02/01 18:43:57 weitzman Exp $
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// Original by Moshe Weitzman (weitzmna@tejasa.com)
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/**
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* @file
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* Enables users to construct their own view of content from terms across
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* multiple vocabularies.
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*/
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/********************************************************************
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* Drupal Hooks :: General Overview
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********************************************************************/
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/**
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* Implementation of hook_menu().
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*/
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function taxonomy_browser_menu($may_cache) {
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$items = array();
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if ($may_cache) {
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$items[] = array('path' => 'taxonomy_browser', 'title' => t('category browser'),
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'access' => user_access('access content'),
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'callback' => 'taxonomy_browser_page',
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'weight' => 7,
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'type' => MENU_NORMAL_ITEM);
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}
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return $items;
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}
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/**
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* Implementation of hook_help().
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*/
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function taxonomy_browser_help($section = '') {
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switch ($section) {
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case 'admin/modules#description':
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return t('An interface for viewing content grouped by arbitrary taxonomy terms.');
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case 'taxonomy_browser':
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return variable_get('taxonomy_browser_guidelines', _taxonomy_browser_guidelines_default());
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}
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}
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/********************************************************************
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* Drupal Hooks :: Core
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********************************************************************/
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/**
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* Implementation of hook_settings().
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*/
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function taxonomy_browser_settings() {
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if (!module_exist('node_type_filter') && !drupal_set_message()) {
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drupal_set_message(t('You do not have the node_type_filter module installed. This means that the \'restrict search by content type\' option will not be available on the category browser page.'));
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}
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$form['taxonomy_browser_guidelines'] = array(
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'#title' => t('Guidelines'),
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'#type' => 'textarea',
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'#default_value' => variable_get('taxonomy_browser_guidelines', _taxonomy_browser_guidelines_default()),
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'#rows' => 6,
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'#description' => t('Instructions which should appear at top of the category browser main page'),
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);
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$vocabularies = taxonomy_get_vocabularies();
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foreach ($vocabularies as $vocabulary) {
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$select[$vocabulary->vid] = $vocabulary->name;
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}
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$form['taxonomy_browser_vocabularies'] = array(
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'#title' => t('Included Vocabularies'),
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'#type' => 'select',
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'#default_value' => variable_get('taxonomy_browser_vocabularies', array()),
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'#options' => $select,
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'#description' => t('Select the vocabularies the user can select from on the category browser page'),
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'#multiple' => TRUE,
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'#size' => 6,
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);
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return $form;
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}
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/********************************************************************
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* Module Functions :: Public
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********************************************************************/
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/**
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* Menu callback: the query building interface for nodes selected based on
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* taxonomy terms.
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*/
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function taxonomy_browser_page() {
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$form = array();
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$form['scope'] = array(
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'#type' => 'fieldset',
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'#title' => t('Scope'),
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'#collapsible' => FALSE,
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);
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if (module_exist('node_type_filter')) {
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$filter_options['all'] = t('all');
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foreach (node_get_types() as $type => $name) {
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$filter_options[$type] = $name;
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}
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$form['scope']['node_filter'] = array(
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'#type' => 'radios',
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'#title' => t('Restrict search by content type'),
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'#options' => $filter_options,
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'#default_value' => 'all',
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);
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}
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$form['scope']['operator'] = array(
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'#type' => 'radios',
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'#title' => t('Items containing'),
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'#options' => array(t('<strong>all</strong> terms'), t('<strong>any</strong> terms')),
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'#default_value' => 0,
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);
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$vocabularies = variable_get('taxonomy_browser_vocabularies', array());
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$form['taxonomy'] = array(
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'#type' => 'fieldset',
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'#title' => t('Categories'),
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'#tree' => TRUE,
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);
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$i = 0;
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foreach ($vocabularies as $v) {
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$form['taxonomy'][$v] = taxonomy_form($v);
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$form['taxonomy'][$v]['#weight'] = $i;
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$i++;
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}
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$form['submit'] = array(
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'#type' => 'submit',
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'#value' => t('Search'),
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);
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return drupal_get_form('taxonomy_browser_page', $form);
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}
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/**
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* Themable form output for the category browser page.
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*/
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function theme_taxonomy_browser_page($form) {
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$output = '';
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$vocabularies = variable_get('taxonomy_browser_vocabularies', array());
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if (empty($vocabularies)) {
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form_set_error('taxonomy_browser_page', t('You must select the vocabularies to display from the <a href="%link">taxonomy browser settings page</a>.', array ('%link' => url('admin/settings/taxonomy_browser'))));
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return ' ';
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}
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$output .= form_render($form);
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return $output;
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}
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/**
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* Implementation of hook_form_validate().
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*/
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function taxonomy_browser_page_validate($form_id, $form_values) {
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$tids = _taxonomy_browser_get_tid_list($form_values['taxonomy']);
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if (empty($tids)) {
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form_set_error('taxonomy', t('You must select at least one category in your search.'));
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}
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else {
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$operator = $form_values['operator'] ? 'or' : 'and';
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$node_type = (isset($form_values['node_filter']) && $form_values['node_filter'] != 'all') ? $form_values['node_filter'] : NULL;
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if (!taxonomy_browser_count_nodes($tids, $operator, 0, $node_type)) {
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form_set_error('taxonomy', t('No posts match your criteria.'));
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}
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}
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}
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/**
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* Implementation of hook_form_submit().
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*/
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function taxonomy_browser_page_submit($form_id, $form_values) {
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$tids = _taxonomy_browser_get_tid_list();
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$operator = $form_values['operator'] ? 'or' : 'and';
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$str_tids = ($operator == 'and') ? implode(',', $tids) : implode('+', $tids);
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$node_type = (isset($form_values['node_filter']) && $form_values['node_filter'] != 'all') ? $form_values['node_filter'] : NULL;
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return array('taxonomy/term/'. $str_tids, (isset($node_type) ? 'type='. $node_type : ''));
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}
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/********************************************************************
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* Module Functions :: Private
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********************************************************************/
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/**
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* Private function to count the number of nodes found by the user's query.
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*/
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function taxonomy_browser_count_nodes($tids = array(), $operator = 'or', $depth = 0, $nodetype = NULL) {
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if (count($tids) > 0) {
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// For each term ID, generate an array of descendant term IDs to the right depth.
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$descendant_tids = array();
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if ($depth === 'all') {
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$depth = NULL;
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}
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foreach ($tids as $index => $tid) {
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$term = taxonomy_get_term($tid);
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$tree = taxonomy_get_tree($term->vid, $tid, -1, $depth);
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$descendant_tids[] = array_merge(array($tid), array_map('_taxonomy_get_tid_from_term', $tree));
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}
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$type_where = $nodetype ? "n.type = '". db_escape_string($nodetype). "'" : 1;
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if ($operator == 'or') {
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$str_tids = implode(',', call_user_func_array('array_merge', $descendant_tids));
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$sql_count = "SELECT COUNT(n.nid) FROM {node} n INNER JOIN {term_node} tn ON n.nid = tn.nid WHERE $type_where AND tn.tid IN ($str_tids) ORDER BY n.sticky DESC, n.title ASC";
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}
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else {
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$joins = '';
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$wheres = array();
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$wheres[] = $type_where;
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foreach ($descendant_tids as $index => $tids) {
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$joins .= ' INNER JOIN {term_node} tn'. $index .' ON n.nid = tn'. $index .'.nid';
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$wheres[] = 'tn'. $index .'.tid IN ('. implode(',', $tids) .')';
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}
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$sql_count = "SELECT COUNT(n.nid) FROM {node} n $joins WHERE ". implode(' AND ', $wheres);
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}
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return db_result(db_query(db_rewrite_sql($sql_count)));
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}
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return 0;
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}
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/**
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* Transforms an unpredictably and irregularly nested set of tids (as returned
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* from a taxonomy form) into a linear array of tids.
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*/
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function _taxonomy_browser_get_tid_list($tids = NULL) {
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static $tid_list;
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if (isset($tids) && is_array($tids)) {
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$tid_list = array();
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foreach ($tids as $key => $tid) {
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if (!empty($tid)) {
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if (is_array($tid)) {
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foreach ($tid as $key2 => $tid2) {
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if (!empty($tid2)) {
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$tid_list[] = $tid2;
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}
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}
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}
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else {
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$tid_list[] = $tid;
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}
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}
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}
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}
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return $tid_list;
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}
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/**
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* Provides default guideline text.
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*/
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function _taxonomy_browser_guidelines_default() {
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return t('<p>You may select multiple items from each list by holding down the <code>Ctrl</code> (Mac: <code>command</code>) key while left-clicking each item.</p>');
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}
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?>
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