forum.module 41.3 KB
Newer Older
Dries's avatar
 
Dries committed
1 2 3
<?php
// $Id$

Dries's avatar
 
Dries committed
4 5 6 7 8
/**
 * @file
 * Enable threaded discussions about general topics.
 */

9 10 11 12
/**
 * Implementation of hook_help().
 */
function forum_help($section) {
Dries's avatar
 
Dries committed
13
  switch ($section) {
14 15
    case 'admin/help#forum':
      $output = '<p>'. t('The forum module lets you create threaded discussion forums for a particular topic on your site. This is similar to a message board system such as phpBB. Forums are very useful because they allow community members to discuss topics with one another, and they are archived for future reference.') .'</p>';
16
      $output .= '<p>'. t('Forums can be organized under what are called <em>containers</em>. Containers hold forums and, in turn, forums hold threaded discussions. Both containers and forums can be placed inside other containers and forums. By planning the structure of your containers and forums well, you make it easier for users to find a topic area of interest to them. Forum topics can be moved by selecting a different forum and can be left in the existing forum by selecting <em>leave a shadow copy</em>. Forum topics can also have their own URL.') .'</p>';
17 18 19
      $output .= '<p>'. t('Forums module <strong>requires Taxonomy and Comments module</strong> be enabled.') .'</p>';
      $output .= t('<p>You can</p>
<ul>
20 21
<li>administer forums at <a href="%admin-forum">administer &gt;&gt; content management &gt;&gt; forums</a>.</li>
<li>enable the required comment and taxonomy modules at <a href="%admin-modules">administer &gt;&gt; site configuration &gt;&gt; modules</a>.</li>
22 23 24
<li>read about the comment module at <a href="%admin-help-comment">administer &gt;&gt; help &gt;&gt; comment</a>.</li>
<li>read about the taxonomy module at <a href="%admin-help-taxonomy">administer &gt;&gt; help &gt;&gt; taxonomy</a>.</li>
</ul>
25
', array('%admin-forum' => url('admin/content/forum'), '%admin-modules' => url('admin/settings/modules'), '%admin-help-comment' => url('admin/help/comment'), '%admin-help-taxonomy' => url('admin/help/taxonomy')));
26
      $output .= '<p>'. t('For more information please read the configuration and customization handbook <a href="%forum">Forum page</a>.', array('%forum' => 'http://drupal.org/handbook/modules/forum/')) .'</p>';
27
      return $output;
28
    case 'admin/settings/modules#description':
29
      return t('Enables threaded discussions about general topics.');
30
    case 'admin/content/forum':
31
      return t('<p>This is a list of existing containers and forums that you can edit. Containers hold forums and, in turn, forums hold threaded discussions. Both containers and forums can be placed inside other containers and forums. By planning the structure of your containers and forums well, you make it easier for users to find a topic area of interest to them.</p>');
32
    case 'admin/content/forum/add/container':
33
      return t('<p>Containers help you organize your forums. The job of a container is to hold, or contain, other forums that are related. For example, a container named "Food" might hold two forums named "Fruit" and "Vegetables".</p>');
34
    case 'admin/content/forum/add/forum':
35
      return t('<p>A forum holds discussion topics that are related. For example, a forum named "Fruit" might contain topics titled "Apples" and "Bananas".</p>');
Dries's avatar
 
Dries committed
36 37 38
  }
}

39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
/**
 * Implementation of hook_menu().
 */
function forum_menu($may_cache) {
  $items = array();

  if ($may_cache) {
    $items[] = array('path' => 'node/add/forum',
      'title' => t('forum topic'),
      'access' => user_access('create forum topics'));
    $items[] = array('path' => 'forum',
      'title' => t('forums'),
      'callback' => 'forum_page',
      'access' => user_access('access content'),
      'type' => MENU_SUGGESTED_ITEM);
54
    $items[] = array('path' => 'admin/content/forum',
55
      'title' => t('forums'),
56
      'description' => t('Control forums and their hierarchy and change forum settings.'),
57 58 59
      'callback' => 'forum_overview',
      'access' => user_access('administer forums'),
      'type' => MENU_NORMAL_ITEM);
60
    $items[] = array('path' => 'admin/content/forum/list',
61 62 63 64
      'title' => t('list'),
      'access' => user_access('administer forums'),
      'type' => MENU_DEFAULT_LOCAL_TASK,
      'weight' => -10);
65
    $items[] = array('path' => 'admin/content/forum/add/container',
66 67 68 69
      'title' => t('add container'),
      'callback' => 'forum_form_container',
      'access' => user_access('administer forums'),
      'type' => MENU_LOCAL_TASK);
70
    $items[] = array('path' => 'admin/content/forum/add/forum',
71 72 73 74
      'title' => t('add forum'),
      'callback' => 'forum_form_forum',
      'access' => user_access('administer forums'),
      'type' => MENU_LOCAL_TASK);
75 76
    $items[] = array('path' => 'admin/content/forum/settings',
      'title' => t('settings'),
Dries's avatar
Dries committed
77
      'callback' => 'forum_admin_settings',
78
      'weight' => 5,
79
      'access' => user_access('administer forums'),
80
      'type' => MENU_LOCAL_TASK);
81
  }
82 83
  elseif (is_numeric(arg(5))) {
    $term = taxonomy_get_term(arg(5));
84 85
    // Check if this is a valid term.
    if ($term) {
86
      $items[] = array('path' => 'admin/content/forum/edit/container',
87 88 89 90 91
        'title' => t('edit container'),
        'callback' => 'forum_form_container',
        'callback arguments' => array((array)$term),
        'access' => user_access('administer forums'),
        'type' => MENU_CALLBACK);
92
      $items[] = array('path' => 'admin/content/forum/edit/forum',
93 94 95 96 97 98 99 100 101 102 103
        'title' => t('edit forum'),
        'callback' => 'forum_form_forum',
        'callback arguments' => array((array)$term),
        'access' => user_access('administer forums'),
        'type' => MENU_CALLBACK);
    }
  }

  return $items;
}

104
/**
105
 * Implementation of hook_node_info().
106
 */
107
function forum_node_info() {
108 109 110 111 112 113 114 115
  return array(
    'forum' => array(
      'name' => t('forum topic'),
      'module' => 'forum',
      'description' => t('Create a new topic for discussion in the forums.'),
      'title_label' => t('Subject'),
    )
  );
Dries's avatar
 
Dries committed
116 117
}

118 119 120
/**
 * Implementation of hook_access().
 */
Dries's avatar
 
Dries committed
121
function forum_access($op, $node) {
Dries's avatar
 
Dries committed
122 123
  global $user;

Dries's avatar
 
Dries committed
124 125
  if ($op == 'create') {
    return user_access('create forum topics');
Dries's avatar
 
Dries committed
126
  }
Dries's avatar
 
Dries committed
127 128 129 130 131 132

  if ($op == 'update' || $op == 'delete') {
    if (user_access('edit own forum topics') && ($user->uid == $node->uid)) {
      return TRUE;
    }
  }
Dries's avatar
 
Dries committed
133 134
}

135 136 137
/**
 * Implementation of hook_perm().
 */
Dries's avatar
 
Dries committed
138
function forum_perm() {
139
  return array('create forum topics', 'edit own forum topics', 'administer forums');
Dries's avatar
 
Dries committed
140
}
Dries's avatar
 
Dries committed
141

142 143 144 145 146
/**
 * Implementation of hook_nodeapi().
 */
function forum_nodeapi(&$node, $op, $teaser, $page) {
  switch ($op) {
147
    case 'delete revision':
148 149 150 151 152
      db_query('DELETE FROM {forum} WHERE vid = %d', $node->vid);
      break;
  }
}

153 154 155
/**
 * Implementation of hook_taxonomy().
 */
156
function forum_taxonomy($op, $type, $term = NULL) {
157
  if ($op == 'delete' && $term['vid'] == _forum_get_vid()) {
158 159
    switch ($type) {
      case 'term':
160
        $results = db_query('SELECT f.nid FROM {forum} f WHERE f.tid = %d', $term['tid']);
161 162 163 164 165 166 167
        while ($node = db_fetch_object($results)) {
          // node_delete will also remove any association with non-forum vocabularies.
          node_delete($node->nid);
        }

        // For containers, remove the tid from the forum_containers variable.
        $containers = variable_get('forum_containers', array());
168 169
        $key = array_search($term['tid'], $containers);
        if ($key !== FALSE) {
170 171 172 173 174 175
          unset($containers[$key]);
        }
        variable_set('forum_containers', $containers);
        break;
      case 'vocabulary':
        variable_del('forum_nav_vocabulary');
Dries's avatar
 
Dries committed
176
    }
177 178
  }
}
Dries's avatar
 
Dries committed
179

Dries's avatar
Dries committed
180
function forum_admin_settings() {
181

182
  $form = array();
183
  $number = drupal_map_assoc(array(5, 10, 15, 20, 25, 30, 35, 40, 50, 60, 80, 100, 150, 200, 250, 300, 350, 400, 500));
184 185 186 187 188 189
  $form['forum_hot_topic'] = array('#type' => 'select',
    '#title' => t('Hot topic threshold'),
    '#default_value' => variable_get('forum_hot_topic', 15),
    '#options' => $number,
    '#description' => t('The number of posts a topic must have to be considered hot.'),
  );
190
  $number = drupal_map_assoc(array(10, 25, 50, 75, 100));
191 192 193 194 195 196
  $form['forum_per_page'] = array('#type' => 'select',
    '#title' => t('Topics per page'),
    '#default_value' => variable_get('forum_per_page', 25),
    '#options' => $number,
    '#description' => t('The default number of topics displayed per page; links to browse older messages are automatically being displayed.'),
  );
197
  $forder = array(1 => t('Date - newest first'), 2 => t('Date - oldest first'), 3 => t('Posts - most active first'), 4=> t('Posts - least active first'));
198 199 200 201 202 203
  $form['forum_order'] = array('#type' => 'radios',
    '#title' => t('Default order'),
    '#default_value' => variable_get('forum_order', '1'),
    '#options' => $forder,
    '#description' => t('The default display order for topics.'),
  );
204

205
  return system_settings_form('forum_admin_configure', $form);
206 207
}

208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231
/**
 * Implementation of hook_form_alter().
 */
function forum_form_alter($form_id, &$form) {
  // hide critical options from forum vocabulary
  if ($form_id == 'taxonomy_form_vocabulary') {
    if ($form['vid']['#value'] == _forum_get_vid()) {
      $form['help_forum_vocab'] = array(
        '#value' => t('This is the designated forum vocabulary. Some of the normal vocabulary options have been removed.'),
        '#weight' => -1,
      );
      $form['nodes']['forum'] = array('#type' => 'checkbox', '#value' => 1, '#title' => t('forum topic'), '#attributes' => array('disabled' => '' ), '#description' => t('forum topic is affixed to the forum vocabulary.'));
      $form['hierarchy'] = array('#type' => 'value', '#value' => 1);
      unset($form['relations']);
      unset($form['tags']);
      unset($form['multiple']);
      $form['required'] = array('#type' => 'value', '#value' => 1);
    }
    else {
      unset($form['nodes']['forum']);
    }
  }
}

232 233 234
/**
 * Implementation of hook_load().
 */
Dries's avatar
 
Dries committed
235
function forum_load($node) {
236
  $forum = db_fetch_object(db_query('SELECT * FROM {forum} WHERE vid = %d', $node->vid));
Dries's avatar
 
Dries committed
237 238 239 240

  return $forum;
}

241 242 243 244 245 246
/**
 * Implementation of hook_block().
 *
 * Generates a block containing the currently active forum topics and the
 * most recently added forum topics.
 */
247 248 249
function forum_block($op = 'list', $delta = 0, $edit = array()) {
  switch ($op) {
    case 'list':
Dries's avatar
 
Dries committed
250 251
      $blocks[0]['info'] = t('Active forum topics');
      $blocks[1]['info'] = t('New forum topics');
252
      return $blocks;
Dries's avatar
 
Dries committed
253

254
    case 'configure':
255
      $form['forum_block_num_'. $delta] = array('#type' => 'select', '#title' => t('Number of topics'), '#default_value' => variable_get('forum_block_num_'. $delta, '5'), '#options' => drupal_map_assoc(array(2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)));
256
      return $form;
Dries's avatar
 
Dries committed
257

258
    case 'save':
259
      variable_set('forum_block_num_'. $delta, $edit['forum_block_num_'. $delta]);
260
      break;
Dries's avatar
 
Dries committed
261

262 263
    case 'view':
      if (user_access('access content')) {
Dries's avatar
 
Dries committed
264 265
        switch ($delta) {
          case 0:
266
            $title = t('Active forum topics');
267
            $sql = db_rewrite_sql("SELECT n.nid, n.title, l.comment_count FROM {node} n INNER JOIN {node_comment_statistics} l ON n.nid = l.nid WHERE n.status = 1 AND n.type = 'forum' ORDER BY l.last_comment_timestamp DESC");
268 269 270 271
            $result = db_query_range($sql, 0, variable_get('forum_block_num_0', '5'));
            if (db_num_rows($result)) {
              $content = node_title_list($result);
            }
272
            break;
Dries's avatar
 
Dries committed
273 274

          case 1:
275 276
            $title = t('New forum topics');
            $sql = db_rewrite_sql("SELECT n.nid, n.title, l.comment_count FROM {node} n INNER JOIN {node_comment_statistics} l ON n.nid = l.nid WHERE n.type = 'forum' AND n.status = 1 ORDER BY n.nid DESC");
277 278 279 280
            $result = db_query_range($sql, 0, variable_get('forum_block_num_1', '5'));
            if (db_num_rows($result)) {
              $content = node_title_list($result);
            }
281
            break;
Dries's avatar
 
Dries committed
282
        }
Dries's avatar
 
Dries committed
283

284
        if ($content) {
285
          $content .= '<div class="more-link">'. l(t('more'), 'forum', array('title' => t('Read the latest forum topics.'))) .'</div>';
286 287
        }

Dries's avatar
 
Dries committed
288
        $block['subject'] = $title;
289 290 291 292 293
        $block['content'] = $content;

        return $block;
      }
  }
Dries's avatar
 
Dries committed
294 295
}

296 297 298
/**
 * Implementation of hook_view().
 */
Dries's avatar
 
Dries committed
299
function forum_view(&$node, $teaser = FALSE, $page = FALSE) {
Dries's avatar
 
Dries committed
300
  if ($page) {
Dries's avatar
 
Dries committed
301
    $vocabulary = taxonomy_get_vocabulary(variable_get('forum_nav_vocabulary', ''));
Dries's avatar
 
Dries committed
302
    // Breadcrumb navigation
Dries's avatar
 
Dries committed
303 304
    $breadcrumb = array();
    $breadcrumb[] = array('path' => 'forum', 'title' => $vocabulary->name);
Dries's avatar
 
Dries committed
305
    if ($parents = taxonomy_get_parents_all($node->tid)) {
Dries's avatar
 
Dries committed
306 307
      $parents = array_reverse($parents);
      foreach ($parents as $p) {
Dries's avatar
 
Dries committed
308
        $breadcrumb[] = array('path' => 'forum/'. $p->tid, 'title' => $p->name);
Dries's avatar
 
Dries committed
309 310
      }
    }
Dries's avatar
 
Dries committed
311 312
    $breadcrumb[] = array('path' => 'node/'. $node->nid);
    menu_set_location($breadcrumb);
313
  }
Dries's avatar
 
Dries committed
314

315
  $node = node_prepare($node, $teaser);
316 317 318 319 320
  $node->content['forum_navigation'] = array(
    '#value' => theme('forum_topic_navigation', $node),
    '#weight' => 100,
  );
  return $node;
Dries's avatar
 
Dries committed
321 322
}

323
/**
324
 * Implementation of hook_submit().
325 326 327 328
 *
 * Check in particular that only a "leaf" term in the associated taxonomy
 * vocabulary is selected, not a "container" term.
 */
329
function forum_submit(&$node) {
330
  // Make sure all fields are set properly:
Dries's avatar
 
Dries committed
331
  $node->icon = $node->icon ? $node->icon : '';
Dries's avatar
 
Dries committed
332 333

  if ($node->taxonomy) {
334 335 336 337 338 339 340
    // Get the forum terms from the (cached) tree
    $tree = taxonomy_get_tree(_forum_get_vid());
    if ($tree) {
      foreach ($tree as $term) {
        $forum_terms[] = $term->tid;
      }
    }
Dries's avatar
 
Dries committed
341
    foreach ($node->taxonomy as $term) {
342
      if (in_array($term, $forum_terms)) {
343
        $node->tid = $term;
Dries's avatar
 
Dries committed
344
      }
345
    }
346
    $old_tid = db_result(db_query_range("SELECT tid FROM {forum} WHERE nid = %d ORDER BY vid DESC", $node->nid, 0,1));
347
    if ($old_tid) {
348 349 350
      if (($node->tid != $old_tid) && $node->shadow) {
        // A shadow copy needs to be created. Retain new term and add old term.
        $node->taxonomy[] = $old_tid;
Dries's avatar
 
Dries committed
351 352
      }
    }
Dries's avatar
Dries committed
353 354 355
  }
}

356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377
/**
 * Implementation of hook_validate().
 *
 * Check in particular that only a "leaf" term in the associated taxonomy
 * vocabulary is selected, not a "container" term.
 */
function forum_validate($node) {
  if ($node->taxonomy) {
    // Extract the node's proper topic ID.
    $vocabulary = variable_get('forum_nav_vocabulary', '');
    $containers = variable_get('forum_containers', array());
    foreach ($node->taxonomy as $term) {
      if (db_result(db_query('SELECT COUNT(*) FROM {term_data} WHERE tid = %d AND vid = %d', $term, $vocabulary))) {
        if (in_array($term, $containers)) {
          $term = taxonomy_get_term($term);
          form_set_error('taxonomy', t('The item %forum is only a container for forums. Please select one of the forums below it.', array('%forum' => theme('placeholder', $term->name))));
        }
      }
    }
  }
}

Dries's avatar
 
Dries committed
378 379 380 381
/**
 * Implementation of hook_update().
 */
function forum_update($node) {
382
  if ($node->revision) {
383 384 385 386 387
    db_query("INSERT INTO {forum} (nid, vid, tid) VALUES (%d, %d, %d)", $node->nid, $node->vid, $node->tid);
  }
  else {
    db_query('UPDATE {forum} SET tid = %d WHERE vid = %d', $node->tid, $node->vid);
  }
Dries's avatar
 
Dries committed
388 389
}

390 391 392
/**
 * Implementation of hook_form().
 */
Dries's avatar
 
Dries committed
393
function forum_form(&$node) {
394 395
  $type = node_get_types('type', $node);
  $form['title'] = array('#type' => 'textfield', '#title' => check_plain($type->title_label), '#default_value' => $node->title, '#required' => TRUE, '#weight' => -5);
396

397
  if ($node->nid) {
398
    $forum_terms = taxonomy_node_get_terms_by_vocabulary(_forum_get_vid(), $node->nid);
Dries's avatar
Dries committed
399
    // if editing, give option to leave shadows
400
    $shadow = (count($forum_terms) > 1);
401
    $form['shadow'] = array('#type' => 'checkbox', '#title' => t('Leave shadow copy'), '#default_value' => $shadow, '#description' => t('If you move this topic, you can leave a link in the old forum to the new forum.'));
Dries's avatar
Dries committed
402
  }
Dries's avatar
 
Dries committed
403

404
  $form['body_filter']['body'] = array('#type' => 'textarea', '#title' => check_plain($type->body_label), '#default_value' => $node->body, '#rows' => 20, '#required' => TRUE);
405
  $form['body_filter']['format'] = filter_form($node->format);
Dries's avatar
 
Dries committed
406

407
  return $form;
Dries's avatar
 
Dries committed
408 409
}

410 411 412 413 414 415
/**
 * Implementation of hook_prepare; assign forum taxonomy when adding a topic from within a forum.
 */
function forum_prepare(&$node) {
  if (!$node->nid) {
    // new topic
416 417
    $node->taxonomy[arg(3)]->vid = _forum_get_vid();
    $node->taxonomy[arg(3)]->tid = arg(3);
418 419 420
  }
}

421 422 423
/**
 * Implementation of hook_insert().
 */
Dries's avatar
 
Dries committed
424
function forum_insert($node) {
425
  db_query('INSERT INTO {forum} (nid, vid, tid) VALUES (%d, %d, %d)', $node->nid, $node->vid, $node->tid);
Dries's avatar
 
Dries committed
426 427
}

428 429 430
/**
 * Implementation of hook_delete().
 */
Dries's avatar
 
Dries committed
431
function forum_delete(&$node) {
Dries's avatar
 
Dries committed
432
  db_query('DELETE FROM {forum} WHERE nid = %d', $node->nid);
Dries's avatar
 
Dries committed
433
}
Dries's avatar
 
Dries committed
434

435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532
/**
 * Returns a form for adding a container to the forum vocabulary
 *
 * @param $edit Associative array containing a container term to be added or edited.
 */
function forum_form_container($edit = array()) {
  // Handle a delete operation.
  if ($_POST['op'] == t('Delete') || $_POST['edit']['confirm']) {
    return _forum_confirm_delete($edit['tid']);
  }

  $form['name'] = array(
    '#title' => t('Container name'),
    '#type' => 'textfield',
    '#default_value' => $edit['name'],
    '#maxlength' =>  64,
    '#description' => t('The container name is used to identify related forums.'),
    '#required' => TRUE
  );

  $form['description'] = array(
    '#type' => 'textarea',
    '#title' => t('Description'),
    '#default_value' => $edit['description'],
    '#description' => t('The container description can give users more information about the forums it contains.')
  );
  $form['parent']['#tree'] = TRUE;
  $form['parent'][0] = _forum_parent_select($edit['tid'], t('Parent'), 'container');
  $form['weight'] = array('#type' => 'weight',
    '#title' => t('Weight'),
    '#default_value' => $edit['weight'],
    '#description' => t('When listing containers, those with with light (small) weights get listed before containers with heavier (larger) weights. Containers with equal weights are sorted alphabetically.')
  );

  $form['vid'] = array('#type' => 'hidden',
    '#value' => _forum_get_vid());
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Submit')
  );
  if ($edit['tid']) {
    $form['delete'] = array('#type' => 'submit', '#value' => t('Delete'));
    $form['tid'] = array('#type' => 'value', '#value' => $edit['tid']);
  }

  return drupal_get_form('forum_form_container', $form, 'forum_form');
}

/**
 * Returns a form for adding a forum to the forum vocabulary
 *
 * @param $edit Associative array containing a forum term to be added or edited.
 */
function forum_form_forum($edit = array()) {
  // Handle a delete operation.
  if ($_POST['op'] == t('Delete') || $_POST['edit']['confirm']) {
    return _forum_confirm_delete($edit['tid']);
  }

  $form['name'] = array('#type' => 'textfield',
    '#title' => t('Forum name'),
    '#default_value' => $edit['name'],
    '#maxlength' =>  64,
    '#description' => t('The forum name is used to identify related discussions.'),
    '#required' => TRUE,
  );
  $form['description'] = array('#type' => 'textarea',
    '#title' => t('Description'),
    '#default_value' => $edit['description'],
    '#description' => t('The forum description can give users more information about the discussion topics it contains.'),
  );
  $form['parent']['#tree'] = TRUE;
  $form['parent'][0] = _forum_parent_select($edit['tid'], t('Parent'), 'forum');
  $form['weight'] = array('#type' => 'weight',
    '#title' => t('Weight'),
    '#default_value' => $edit['weight'],
    '#description' => t('When listing forums, those with lighter (smaller) weights get listed before containers with heavier (larger) weights. Forums with equal weights are sorted alphabetically.'),
  );

  $form['vid'] = array('#type' => 'hidden', '#value' => _forum_get_vid());
  $form['submit' ] = array('#type' => 'submit', '#value' => t('Submit'));
  if ($edit['tid']) {
    $form['delete'] = array('#type' => 'submit', '#value' => t('Delete'));
    $form['tid'] = array('#type' => 'hidden', '#value' => $edit['tid']);
  }

  return drupal_get_form('forum_form_forum', $form, 'forum_form');
}

/**
 * Process forum form and container form submissions.
 */
function forum_form_submit($form_id, $form_values) {
  if ($form_id == 'forum_form_container') {
    $container = TRUE;
    $type = t('forum container');
  }
  else {
533
    $container = FALSE;
534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550
    $type = t('forum');
  }

  $status = taxonomy_save_term($form_values);
  switch ($status) {
    case SAVED_NEW:
      if ($container) {
        $containers = variable_get('forum_containers', array());
        $containers[] = $form_values['tid'];
        variable_set('forum_containers', $containers);
      }
      drupal_set_message(t('Created new %type %term.', array('%term' => theme('placeholder', $form_values['name']), '%type' => $type)));
      break;
    case SAVED_UPDATED:
      drupal_set_message(t('The %type %term has been updated.', array('%term' => theme('placeholder', $form_values['name']), '%type' => $type)));
      break;
  }
551
  return 'admin/content/forum';
552 553 554 555 556 557 558 559 560 561 562 563 564
}

/**
 * Returns a confirmation page for deleting a forum taxonomy term.
 *
 * @param $tid ID of the term to be deleted
 */
function _forum_confirm_delete($tid) {
  $term = taxonomy_get_term($tid);

  $form['tid'] = array('#type' => 'value', '#value' => $tid);
  $form['name'] = array('#type' => 'value', '#value' => $term->name);

565
  return confirm_form('forum_confirm_delete', $form, t('Are you sure you want to delete the forum %name?', array('%name' => theme('placeholder', $term->name))), 'admin/content/forums', t('Deleting a forum or container will delete all sub-forums and associated posts as well. This action cannot be undone.'), t('Delete'), t('Cancel'));
566 567 568 569 570 571 572
}

/**
 * Implementation of forms api _submit call. Deletes a forum after confirmation.
 */
function forum_confirm_delete_submit($form_id, $form_values) {
  taxonomy_del_term($form_values['tid']);
573 574
  drupal_set_message(t('The forum %term and all sub-forums and associated posts have been deleted.', array('%term' => theme('placeholder', $form_values['name']))));
  watchdog('content', t('forum: deleted %term and all its sub-forums and associated posts.', array('%term' => theme('placeholder', $form_values['name']))));
575

576
  return 'admin/content/forum';
577 578 579 580 581 582 583 584 585 586 587 588
}

/**
 * Returns an overview list of existing forums and containers
 */
function forum_overview() {
  $header = array(t('Name'), t('Operations'));

  $tree = taxonomy_get_tree(_forum_get_vid());
  if ($tree) {
    foreach ($tree as $term) {
      if (in_array($term->tid, variable_get('forum_containers', array()))) {
589
        $rows[] = array(_taxonomy_depth($term->depth) .' '. check_plain($term->name), l(t('edit container'), "admin/content/forum/edit/container/$term->tid"));
590 591
      }
      else {
592
        $rows[] = array(_taxonomy_depth($term->depth) .' '. check_plain($term->name), l(t('edit forum'), "admin/content/forum/edit/forum/$term->tid"));
593 594 595 596 597
       }

    }
  }
  else {
598
    $rows[] = array(array('data' => '<em>' . t('There are no existing containers or forums. You may add some on the <a href="%container">add container</a> or <a href="%forum">add forum</a> pages.', array('%container' => url('admin/content/forum/add/container'), '%forum' => url('admin/content/forum/add/forum'))) . '</em>', 'colspan' => 2));
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
  }
  return theme('table', $header, $rows);
}

/**
 * Returns a select box for available parent terms
 *
 * @param $tid ID of the term which is being added or edited
 * @param $title Title to display the select box with
 * @param $child_type Whether the child is forum or container
 */
function _forum_parent_select($tid, $title, $child_type) {

  $parents = taxonomy_get_parents($tid);
  if ($parents) {
    $parent = array_shift($parents);
    $parent = $parent->tid;
  }
  else {
    $parent = 0;
  }

  $children = taxonomy_get_tree(_forum_get_vid(), $tid);

  // A term can't be the child of itself, nor of its children.
  foreach ($children as $child) {
    $exclude[] = $child->tid;
  }
  $exclude[] = $tid;

  $tree = taxonomy_get_tree(_forum_get_vid());
  $options[0] = '<'. t('root') .'>';
  if ($tree) {
    foreach ($tree as $term) {
      if (!in_array($term->tid, $exclude)) {
        $options[$term->tid] = _taxonomy_depth($term->depth) . $term->name;
      }
    }
  }
  if ($child_type == 'container') {
    $description = t('Containers are usually placed at the top (root) level of your forum but you can also place a container inside a parent container or forum.');
  }
  else if ($child_type == 'forum') {
    $description = t('You may place your forum inside a parent container or forum, or at the top (root) level of your forum.');
  }

  return array('#type' => 'select', '#title' => $title, '#default_value' => $parent, '#options' => $options, '#description' => $description, '#required' => TRUE);
}

648
function forum_link_alter(&$node, &$links) {
649
  foreach ($links as $module => $link) {
650
    if (strstr($module, 'taxonomy_term')) {
651 652
      // Link back to the forum and not the taxonomy term page. We'll only
      // do this if the taxonomy term in question belongs to forums.
653
      $tid = str_replace('taxonomy/term/', '', $link['href']);
654 655
      $term = taxonomy_get_term($tid);
      if ($term->vid == _forum_get_vid()) {
656
        $links[$module]['href'] = str_replace('taxonomy/term', 'forum', $link['href']);
657
      }
658 659
    }
  }
660 661 662 663 664 665 666 667 668 669 670
}

/**
 * Returns the vocabulary id for forum navigation.
 */
function _forum_get_vid() {
  $vid = variable_get('forum_nav_vocabulary', '');
  if (empty($vid)) {
    // Check to see if a forum vocabulary exists
    $vid = db_result(db_query("SELECT vid FROM {vocabulary} WHERE module = '%s'", 'forum'));
    if (!$vid) {
671 672 673
      // Create the forum vocabulary. Assign the vocabulary a low weight so
      // it will appear first in forum topic create and edit forms.
      $edit = array('name' => 'Forums', 'multiple' => 0, 'required' => 1, 'hierarchy' => 1, 'relations' => 0, 'module' => 'forum', 'weight' => -10, 'nodes' => array('forum' => 1));
674 675 676 677 678 679 680 681 682
      taxonomy_save_vocabulary($edit);
      $vid = $edit['vid'];
    }
    variable_set('forum_nav_vocabulary', $vid);
  }

  return $vid;
}

Dries's avatar
 
Dries committed
683 684 685
/**
 * Formats a topic for display
 *
686
 * @TODO Give a better description. Not sure where this function is used yet.
Dries's avatar
 
Dries committed
687
 */
Dries's avatar
 
Dries committed
688
function _forum_format($topic) {
689
  if ($topic && $topic->timestamp) {
690
    return t('%time ago<br />by %author', array('%time' => format_interval(time() - $topic->timestamp), '%author' => theme('username', $topic)));
Dries's avatar
 
Dries committed
691 692
  }
  else {
693
    return t('n/a');
Dries's avatar
 
Dries committed
694 695 696
  }
}

Dries's avatar
 
Dries committed
697 698 699
/**
 * Returns a list of all forums for a given taxonomy id
 *
700
 * Forum objects contain the following fields
Dries's avatar
 
Dries committed
701 702 703 704 705 706 707 708 709
 * -num_topics Number of topics in the forum
 * -num_posts Total number of posts in all topics
 * -last_post Most recent post for the forum
 *
 * @param $tid
 *   Taxonomy ID of the vocabulary that holds the forum list.
 * @return
 *   Array of object containing the forum information.
 */
Dries's avatar
 
Dries committed
710
function forum_get_forums($tid = 0) {
711

Dries's avatar
 
Dries committed
712 713
  $forums = array();
  $_forums = taxonomy_get_tree(variable_get('forum_nav_vocabulary', ''), $tid);
Dries's avatar
 
Dries committed
714

Dries's avatar
 
Dries committed
715
  if (count($_forums)) {
Dries's avatar
 
Dries committed
716

Dries's avatar
 
Dries committed
717 718
    $counts = array();

Dries's avatar
 
Dries committed
719
    $sql = "SELECT r.tid, COUNT(n.nid) AS topic_count, SUM(l.comment_count) AS comment_count FROM {node} n INNER JOIN {node_comment_statistics} l ON n.nid = l.nid INNER JOIN {term_node} r ON n.nid = r.nid WHERE n.status = 1 AND n.type = 'forum' GROUP BY r.tid";
720
    $sql = db_rewrite_sql($sql);
Dries's avatar
 
Dries committed
721
    $_counts = db_query($sql, $forum->tid);
Dries's avatar
 
Dries committed
722 723 724
    while ($count = db_fetch_object($_counts)) {
      $counts[$count->tid] = $count;
    }
Dries's avatar
 
Dries committed
725
  }
Dries's avatar
 
Dries committed
726

Dries's avatar
 
Dries committed
727 728 729 730
  foreach ($_forums as $forum) {
    if (in_array($forum->tid, variable_get('forum_containers', array()))) {
      $forum->container = 1;
    }
Dries's avatar
 
Dries committed
731

Dries's avatar
 
Dries committed
732 733 734 735 736 737 738 739 740 741 742
    if ($counts[$forum->tid]) {
      $forum->num_topics = $counts[$forum->tid]->topic_count;
      $forum->num_posts = $counts[$forum->tid]->topic_count + $counts[$forum->tid]->comment_count;
    }
    else {
      $forum->num_topics = 0;
      $forum->num_posts = 0;
    }

    // This query does not use full ANSI syntax since MySQL 3.x does not support
    // table1 INNER JOIN table2 INNER JOIN table3 ON table2_criteria ON table3_criteria
Dries's avatar
 
Dries committed
743
    // used to join node_comment_statistics to users.
744
    $sql = "SELECT ncs.last_comment_timestamp, IF (ncs.last_comment_uid != 0, u2.name, ncs.last_comment_name) AS last_comment_name, ncs.last_comment_uid FROM {node} n INNER JOIN {users} u1 ON n.uid = u1.uid INNER JOIN {term_node} tn ON n.nid = tn.nid INNER JOIN {node_comment_statistics} ncs ON n.nid = ncs.nid INNER JOIN {users} u2 ON ncs.last_comment_uid=u2.uid WHERE n.status = 1 AND tn.tid = %d ORDER BY ncs.last_comment_timestamp DESC";
745
    $sql = db_rewrite_sql($sql);
Dries's avatar
 
Dries committed
746
    $topic = db_fetch_object(db_query_range($sql, $forum->tid, 0, 1));
747 748

    $last_post = new StdClass();
Dries's avatar
 
Dries committed
749 750 751 752
    $last_post->timestamp = $topic->last_comment_timestamp;
    $last_post->name = $topic->last_comment_name;
    $last_post->uid = $topic->last_comment_uid;
    $forum->last_post = $last_post;
Dries's avatar
 
Dries committed
753

Dries's avatar
 
Dries committed
754 755 756 757
    $forums[$forum->tid] = $forum;
  }

  return $forums;
Dries's avatar
 
Dries committed
758 759
}

760 761 762 763 764
/**
 * Calculate the number of nodes the user has not yet read and are newer
 * than NODE_NEW_LIMIT.
 */
function _forum_topics_unread($term, $uid) {
765
  $sql = "SELECT COUNT(n.nid) FROM {node} n INNER JOIN {term_node} tn ON n.nid = tn.nid AND tn.tid = %d LEFT JOIN {history} h ON n.nid = h.nid AND h.uid = %d WHERE n.status = 1 AND n.type = 'forum' AND n.created > %d AND h.nid IS NULL";
766
  $sql = db_rewrite_sql($sql);
767
  return db_result(db_query($sql, $term, $uid, NODE_NEW_LIMIT));
Dries's avatar
 
Dries committed
768 769
}

Dries's avatar
Dries committed
770
function forum_get_topics($tid, $sortby, $forum_per_page) {
Dries's avatar
 
Dries committed
771
  global $user, $forum_topic_list_header;
Dries's avatar
 
Dries committed
772

Dries's avatar
 
Dries committed
773
  $forum_topic_list_header = array(
Dries's avatar
 
Dries committed
774 775
    array('data' => '&nbsp;'),
    array('data' => t('Topic'), 'field' => 'n.title'),
Dries's avatar
 
Dries committed
776
    array('data' => t('Replies'), 'field' => 'l.comment_count'),
Dries's avatar
 
Dries committed
777
    array('data' => t('Created'), 'field' => 'n.created'),
Dries's avatar
 
Dries committed
778
    array('data' => t('Last reply'), 'field' => 'l.last_comment_timestamp'),
Dries's avatar
 
Dries committed
779
  );
Dries's avatar
 
Dries committed
780

Dries's avatar
 
Dries committed
781
  $order = _forum_get_topic_order($sortby);
Dries's avatar
 
Dries committed
782
  for ($i = 0; $i < count($forum_topic_list_header); $i++) {
Dries's avatar
 
Dries committed
783 784
    if ($forum_topic_list_header[$i]['field'] == $order['field']) {
      $forum_topic_list_header[$i]['sort'] = $order['sort'];
Dries's avatar
 
Dries committed
785 786 787 788
    }
  }

  $term = taxonomy_get_term($tid);
Dries's avatar
 
Dries committed
789

790
  $sql = db_rewrite_sql("SELECT n.nid, f.tid, n.title, n.sticky, u.name, u.uid, n.created AS timestamp, n.comment AS comment_mode, l.last_comment_timestamp, IF(l.last_comment_uid != 0, cu.name, l.last_comment_name) AS last_comment_name, l.last_comment_uid, l.comment_count AS num_comments FROM {node_comment_statistics} l, {users} cu, {term_node} r, {users} u, {forum} f, {node} n WHERE n.status = 1 AND l.last_comment_uid = cu.uid AND n.nid = l.nid AND n.nid = r.nid AND r.tid = %d AND n.uid = u.uid AND n.vid = f.vid");
Dries's avatar
 
Dries committed
791
  $sql .= tablesort_sql($forum_topic_list_header, 'n.sticky DESC,');
792
  $sql .= ', n.created DESC';  // Always add a secondary sort order so that the news forum topics are on top.
Dries's avatar
Dries committed
793

794
  $sql_count = db_rewrite_sql("SELECT COUNT(n.nid) FROM {node} n INNER JOIN {term_node} r ON n.nid = r.nid AND r.tid = %d WHERE n.status = 1 AND n.type = 'forum'");
Dries's avatar
 
Dries committed
795

Steven Wittens's avatar
Steven Wittens committed
796
  $result = pager_query($sql, $forum_per_page, 0, $sql_count, $tid);
Dries's avatar
 
Dries committed
797 798

  while ($topic = db_fetch_object($result)) {
Dries's avatar
Dries committed
799 800
    if ($user->uid) {
      // folder is new if topic is new or there are new comments since last visit
Dries's avatar
 
Dries committed
801
      if ($topic->tid != $tid) {
Dries's avatar
Dries committed
802
        $topic->new = 0;
Dries's avatar
 
Dries committed
803 804
      }
      else {
Dries's avatar
 
Dries committed
805
        $history = _forum_user_last_visit($topic->nid);
Dries's avatar
 
Dries committed
806
        $topic->new_replies = comment_num_new($topic->nid, $history);
807
        $topic->new = $topic->new_replies || ($topic->timestamp > $history);
Dries's avatar
 
Dries committed
808
      }
809 810
    }
    else {
811
      // Do not track "new replies" status for topics if the user is anonymous.
Dries's avatar
Dries committed
812 813
      $topic->new_replies = 0;
      $topic->new = 0;
814
    }
Dries's avatar
 
Dries committed
815

Dries's avatar
 
Dries committed
816
    if ($topic->num_comments > 0) {
817
      $last_reply = new StdClass();
Dries's avatar
 
Dries committed
818 819 820 821 822
      $last_reply->timestamp = $topic->last_comment_timestamp;
      $last_reply->name = $topic->last_comment_name;
      $last_reply->uid = $topic->last_comment_uid;
      $topic->last_reply = $last_reply;
    }
Dries's avatar
 
Dries committed
823 824 825
    $topics[] = $topic;
  }

Dries's avatar
Dries committed
826
  return $topics;
Dries's avatar
 
Dries committed
827 828
}

Dries's avatar
 
Dries committed
829 830 831
/**
 * Finds the first unread node for a given forum.
 */
Dries's avatar
Dries committed
832
function _forum_new($tid) {
Dries's avatar
 
Dries committed
833 834
  global $user;

Dries's avatar
 
Dries committed
835
  $sql = "SELECT n.nid FROM {node} n LEFT JOIN {history} h ON n.nid = h.nid AND h.uid = %d INNER JOIN {term_node} r ON n.nid = r.nid AND r.tid = %d WHERE n.status = 1 AND n.type = 'forum' AND h.nid IS NULL AND n.created > %d ORDER BY created";
836
  $sql = db_rewrite_sql($sql);
Dries's avatar
 
Dries committed
837
  $nid = db_result(db_query_range($sql, $user->uid, $tid, NODE_NEW_LIMIT, 0, 1));
Dries's avatar
 
Dries committed
838 839 840 841

  return $nid ? $nid : 0;
}

842
/**
Dries's avatar
Dries committed
843
 * Menu callback; prints a forum listing.
844
 */
Dries's avatar
Dries committed
845
function forum_page($tid = 0) {
846
  if (module_exist('taxonomy') && module_exist('comment')) {
Dries's avatar
Dries committed
847 848
    $forum_per_page = variable_get('forum_per_page', 25);
    $sortby = variable_get('forum_order', 1);
Dries's avatar
 
Dries committed
849

Dries's avatar
Dries committed
850 851 852 853
    $forums = forum_get_forums($tid);
    $parents = taxonomy_get_parents_all($tid);
    if ($tid && !in_array($tid, variable_get('forum_containers', array()))) {
      $topics = forum_get_topics($tid, $sortby, $forum_per_page);
Dries's avatar
 
Dries committed
854
    }
Dries's avatar
Dries committed
855

Dries's avatar
 
Dries committed
856
    return theme('forum_display', $forums, $topics, $parents, $tid, $sortby, $forum_per_page);
Dries's avatar
 
Dries committed
857 858
  }
  else {
859 860
    drupal_set_message(t('The forum module requires both the taxonomy module and the comment module to be enabled and configured.'), 'error');
    return ' ';
Dries's avatar
 
Dries committed
861 862 863
  }
}

Dries's avatar
 
Dries committed
864
/**
Dries's avatar
 
Dries committed
865 866
 * Format the forum body.
 *
Dries's avatar
 
Dries committed
867
 * @ingroup themeable
Dries's avatar
 
Dries committed
868
 */
Dries's avatar
 
Dries committed
869
function theme_forum_display($forums, $topics, $parents, $tid, $sortby, $forum_per_page) {
Dries's avatar
 
Dries committed
870
  global $user;
Dries's avatar
 
Dries committed
871
  // forum list, topics list, topic browser and 'add new topic' link
Dries's avatar
 
Dries committed
872

Dries's avatar
 
Dries committed
873
  $vocabulary = taxonomy_get_vocabulary(variable_get('forum_nav_vocabulary', ''));
874
  $title = $vocabulary->name;
Dries's avatar
 
Dries committed
875

Dries's avatar
 
Dries committed
876 877
  // Breadcrumb navigation:
  $breadcrumb = array();
Dries's avatar
 
Dries committed
878
  if ($tid) {
Dries's avatar
 
Dries committed
879
    $breadcrumb[] = array('path' => 'forum', 'title' => $title);
Dries's avatar
 
Dries committed
880
  }
Dries's avatar
 
Dries committed
881 882

  if ($parents) {
Dries's avatar
 
Dries committed
883 884
    $parents = array_reverse($parents);
    foreach ($parents as $p) {
885 886
      if ($p->tid == $tid) {
        $title = $p->name;
Dries's avatar
 
Dries committed
887 888
      }
      else {
Dries's avatar
 
Dries committed
889
        $breadcrumb[] = array('path' => 'forum/'. $p->tid, 'title' => $p->name);
Dries's avatar
 
Dries committed
890 891 892
      }
    }
  }
893 894 895

  drupal_set_title($title);

Dries's avatar
 
Dries committed
896 897
  $breadcrumb[] = array('path' => $_GET['q']);
  menu_set_location($breadcrumb);
Dries's avatar
 
Dries committed
898

Dries's avatar
 
Dries committed
899
  if (count($forums) || count($parents)) {
900 901
    $output  = '<div id="forum">';
    $output .= '<ul>';
Dries's avatar
 
Dries committed
902 903 904

    if (module_exist('tracker')) {
      if ($user->uid) {
905
        $output .= ' <li>'. l(t('My discussions.'), "tracker/$user->uid") .'</li>';
Dries's avatar
 
Dries committed
906 907
      }

908
      $output .= ' <li>'. l(t('Active discussions.'), 'tracker') .'</li>';
Dries's avatar
 
Dries committed
909 910 911
    }

    if (user_access('create forum topics')) {
912
      $output .= '<li>'. l(t('Post new forum topic.'), "node/add/forum/$tid") .'</li>';
Dries's avatar
 
Dries committed
913 914
    }
    else if ($user->uid) {
915
      $output .= '<li>'. t('You are not allowed to post a new forum topic.') .'</li>';
Dries's avatar
 
Dries committed
916 917 918 919
    }
    else {
      $output .= '<li>'. t('<a href="%login">Login</a> to post a new forum topic.', array('%login' => url('user/login'))) .'</li>';
    }
920
    $output .= '</ul>';
Dries's avatar
 
Dries committed
921

Dries's avatar
 
Dries committed
922
    $output .= theme('forum_list', $forums, $parents, $tid);
Dries's avatar
 
Dries committed
923

Dries's avatar
 
Dries committed
924
    if ($tid && !in_array($tid, variable_get('forum_containers', array()))) {
925 926 927 928
      drupal_add_link(array('rel' => 'alternate',
                            'type' => 'application/rss+xml',
                            'title' =