book.module 32.1 KB
Newer Older
Dries's avatar
 
Dries committed
1
<?php
2
// $Id$
Dries's avatar
 
Dries committed
3

4 5 6
/**
 * Implementation of hook_node_name().
 */
Dries's avatar
 
Dries committed
7
function book_node_name($node) {
8
  return t('book page');
Dries's avatar
 
Dries committed
9 10
}

11 12 13
/**
 * Implementation of hook_perm().
 */
Dries's avatar
 
Dries committed
14
function book_perm() {
15
  return array('maintain books');
Dries's avatar
 
Dries committed
16 17
}

18 19 20
/**
 * Implementation of hook_access().
 */
Dries's avatar
 
Dries committed
21
function book_access($op, $node) {
Dries's avatar
 
Dries committed
22
  global $user;
Dries's avatar
 
Dries committed
23

24
  if ($op == 'view') {
Dries's avatar
 
Dries committed
25 26 27 28
    // Everyone can access all published book pages whether these pages
    // are still waiting for approval or not.  We might not always want
    // to display pages that are waiting for approval, but we take care
    // of that problem in the book_content() function.
Dries's avatar
 
Dries committed
29
    return $node->status;
Dries's avatar
 
Dries committed
30 31
  }

32
  if ($op == 'create') {
Dries's avatar
 
Dries committed
33 34
    // Only registered users can create book pages.  Given the nature
    // of the book module this is considered to be a good/safe idea.
35
    return user_access('maintain books');
Dries's avatar
 
Dries committed
36 37
  }

38
  if ($op == 'update') {
Dries's avatar
 
Dries committed
39 40 41 42 43 44
    // Only registered users can update book pages.  Given the nature
    // of the book module this is considered to be a good/safe idea.
    // One can only update a book page if there are no suggested updates
    // of that page waiting for approval, it is not a PHP page, and
    // the "create new revision" bit is set.  That is, only updates that
    // don't overwrite the current or pending information are allowed.
45
    return user_access('maintain books') && !$node->moderate && !$node->format && $node->revision;
Dries's avatar
 
Dries committed
46
  }
Dries's avatar
 
Dries committed
47 48
}

Dries's avatar
 
Dries committed
49 50 51
/**
 * Implementation of hook_link().
 */
Dries's avatar
 
Dries committed
52
function book_link($type, $node = 0, $main = 0) {
Dries's avatar
 
Dries committed
53 54 55

  $links = array();

Dries's avatar
 
Dries committed
56 57
  if ($type == 'page' && user_access('access content')) {
    $links[] = l(t('books'), 'book', array('title' => t('Read and contribute to the collaborative books.')));
Dries's avatar
 
Dries committed
58 59
  }

Dries's avatar
 
Dries committed
60 61
  if ($type == 'node' && $node->type == 'book') {
    if (book_access('update', $node)) {
Dries's avatar
 
Dries committed
62
      $links[] = l(t('edit this page'), 'node/'. $node->nid .'/edit', array('title' => t('Suggest an update for this book page.')));
Dries's avatar
 
Dries committed
63
    }
Dries's avatar
 
Dries committed
64
    if (!$main) {
Dries's avatar
 
Dries committed
65
      $links[] = l(t('printer-friendly version'), 'book/print/'. $node->nid, array('title' => t('Show a printer-friendly version of this book page and its sub-pages.')));
Dries's avatar
 
Dries committed
66
    }
Dries's avatar
 
Dries committed
67 68
  }

Dries's avatar
 
Dries committed
69
  return $links;
Dries's avatar
 
Dries committed
70 71
}

Dries's avatar
 
Dries committed
72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
/**
 * Implementation of hook_menu().
 */
function book_menu() {
  $items = array();

  $items[] = array('path' => 'node/add/book', 'title' => t('book page'),
    'access' => user_access('maintain books'));
  $items[] = array('path' => 'admin/node/book', 'title' => t('books'),
    'callback' => 'book_admin',
    'access' => user_access('administer nodes'),
    'weight' => 4);
  $items[] = array('path' => 'admin/node/book/orphan', 'title' => t('orphan pages'),
    'callback' => 'book_admin_orphan',
    'access' => user_access('administer nodes'),
    'weight' => 8);
  $result = db_query('SELECT n.nid, n.title FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE b.parent = 0 ORDER BY b.weight, n.title');
  while ($book = db_fetch_object($result)) {
    $items[] = array('path' => 'admin/node/book/'. $book->nid, 'title' => t('"%title" book', array('%title' => $book->title)));
  }
  $items[] = array('path' => 'book', 'title' => t('books'),
    'callback' => 'book_render',
    'access' => user_access('access content'),
    'type' => MENU_SUGGESTED_ITEM);
  $items[] = array('path' => 'book/print', 'title' => t('printer-friendly version'),
    'callback' => 'book_print',
    'access' => user_access('access content'),
    'type' => MENU_CALLBACK);

  return $items;
}

104 105 106
/**
 * Implementation of hook_block().
 *
Dries's avatar
 
Dries committed
107 108
 * Displays the book table of contents in a block when the current page is a
 * single-node view of a book node.
109
 */
Dries's avatar
 
Dries committed
110
function book_block($op = 'list', $delta = 0) {
Dries's avatar
 
Dries committed
111
  $block = array();
Dries's avatar
 
Dries committed
112 113 114 115
  if ($op == 'list') {
    $block[0]['info'] = t('Book navigation');
  }
  else {
Dries's avatar
 
Dries committed
116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133
    // Only display this block when the user is browsing a book:
    if (arg(0) == 'node' && is_numeric(arg(1))) {
      $result = db_query('SELECT n.nid, n.title, b.parent FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE n.nid = %d', arg(1));
      if (db_num_rows($result) > 0) {
        $node = db_fetch_object($result);

        $path = book_location($node);
        $path[] = $node;

        $expand = array();
        foreach ($path as $key => $node) {
          $expand[] = $node->nid;
        }

        $block['subject'] = $path[0]->title;
        $block['content'] = book_tree($expand[0], 5, $expand);
      }
    }
Dries's avatar
 
Dries committed
134 135 136 137 138
  }

   return $block;
}

139 140 141
/**
 * Implementation of hook_load().
 */
Dries's avatar
 
Dries committed
142
function book_load($node) {
Dries's avatar
 
Dries committed
143
  global $user;
Dries's avatar
 
Dries committed
144

145
  $book = db_fetch_object(db_query('SELECT format, parent, weight, log FROM {book} WHERE nid = %d', $node->nid));
Dries's avatar
 
Dries committed
146

147
  if (arg(1) == 'edit' && !user_access('administer nodes')) {
Dries's avatar
 
Dries committed
148 149
    // If a user is about to update a book page, we overload some
    // fields to reflect the changes.
Dries's avatar
 
Dries committed
150 151 152 153 154 155
    if ($user->uid) {
      $book->uid = $user->uid;
      $book->name = $user->name;
    }
    else {
      $book->uid = 0;
156
      $book->name = '';
Dries's avatar
 
Dries committed
157
    }
Dries's avatar
 
Dries committed
158
  }
Dries's avatar
 
Dries committed
159

Dries's avatar
 
Dries committed
160 161 162
  // We set the revision field to indicate that we have to create
  // a new revision when updating this book page.  We enable this
  // always such that the "edit this page" links appear.
Dries's avatar
 
Dries committed
163
  $book->revision = 1;
Dries's avatar
 
Dries committed
164

Dries's avatar
 
Dries committed
165
  return $book;
Dries's avatar
 
Dries committed
166 167
}

168 169 170
/**
 * Implementation of hook_insert().
 */
Dries's avatar
 
Dries committed
171
function book_insert($node) {
Dries's avatar
 
Dries committed
172
  db_query("INSERT INTO {book} (nid, format, parent, weight, log) VALUES (%d, %d, %d, %d, '%s')", $node->nid, $node->format, $node->parent, $node->weight, $node->log);
Dries's avatar
 
Dries committed
173
}
Dries's avatar
 
Dries committed
174

175 176 177
/**
 * Implementation of hook_update().
 */
Dries's avatar
 
Dries committed
178
function book_update($node) {
Dries's avatar
 
Dries committed
179
  db_query("UPDATE {book} SET format = %d, parent = %d, weight = %d, log = '%s' WHERE nid = %d", $node->format, $node->parent, $node->weight, $node->log, $node->nid);
Dries's avatar
 
Dries committed
180
}
Dries's avatar
 
Dries committed
181

182 183 184
/**
 * Implementation of hook_delete().
 */
185
function book_delete(&$node) {
186
  db_query('DELETE FROM {book} WHERE nid = %d', $node->nid);
Dries's avatar
 
Dries committed
187 188
}

189 190 191
/**
 * Implementation of hook_validate().
 */
192
function book_validate(&$node) {
193 194
  if ($node->format && user_access('create php content')) {
    // Do not filter PHP code. Do not auto-extract a teaser.
195 196 197 198 199
    $node->teaser = $node->body;
  }
  else {
    $node->format = 0;
  }
Dries's avatar
 
Dries committed
200

201 202
  // Set default values for non-administrators.
  if (!user_access('administer nodes')) {
203 204 205 206
    $node->format = 0;
    $node->weight = 0;
    $node->revision = 1;
  }
Dries's avatar
 
Dries committed
207 208
}

209 210 211
/**
 * Implementation of hook_form().
 */
Dries's avatar
 
Dries committed
212
function book_form(&$node) {
Dries's avatar
 
Dries committed
213
  global $user;
Dries's avatar
 
Dries committed
214

215 216
  $op = $_POST['op'];
  $output = form_select(t('Parent'), 'parent', $node->parent, book_toc(), t('The parent subject or category the page belongs in.'));
Dries's avatar
 
Dries committed
217

218 219
  if (function_exists('taxonomy_node_form')) {
    $output .= implode('', taxonomy_node_form('book', $node));
220 221
  }

Dries's avatar
 
Dries committed
222
  $output .= form_textarea(t('Body'), 'body', $node->body, 60, 20, filter_tips_short(), NULL, TRUE);
223
  $output .= form_textarea(t('Log message'), 'log', $node->log, 60, 5, t('An explanation of the additions or updates being made to help the group understand your motivations.'));
Dries's avatar
 
Dries committed
224

225 226 227
  if (user_access('administer nodes')) {
    $output .= form_weight(t('Weight'), 'weight', $node->weight, 15, t('The heavier pages will sink and the lighter pages will be positioned nearer the top.'));
    if (user_access('create php content')) {
228
      $output .= form_radios(t('Type'), 'format', $node->format, array(0 => 'HTML / text', 1 => 'PHP'));
Dries's avatar
 
Dries committed
229
    }
Dries's avatar
 
Dries committed
230 231
  }
  else {
Dries's avatar
 
Dries committed
232 233
    // If a regular user updates a book page, we create a new revision
    // authored by that user:
234
    $output .= form_hidden('revision', 1);
Dries's avatar
 
Dries committed
235 236 237 238 239
  }

  return $output;
}

240 241 242
/**
 * Implementation of hook_node_link().
 */
Dries's avatar
 
Dries committed
243
function book_node_link($node = 0) {
Dries's avatar
 
Dries committed
244 245
  global $user;

246 247
  $op = $_POST['op'];
  $edit = $_POST['edit'];
Dries's avatar
 
Dries committed
248

249
  if ($node->type != 'book') {
Dries's avatar
 
Dries committed
250

251 252
    if ($edit['nid']) {
      $node = node_load(array('nid' => $edit['nid']));
Dries's avatar
 
Dries committed
253 254
    }

255 256 257
    if ($op == t('Add to book outline')) {
      db_query('INSERT INTO {book} (nid, parent, weight) VALUES (%d, %d, %d)', $node->nid, $edit['parent'], $edit['weight']);
      drupal_set_message(t('added the node to the book.'));
Dries's avatar
 
Dries committed
258 259
    }

260 261 262
    if ($op == t('Update book outline')) {
      db_query('UPDATE {book} SET parent = %d, weight = %d WHERE nid = %d', $edit['parent'], $edit['weight'], $node->nid);
      drupal_set_message(t('updated the book outline.'));
Dries's avatar
 
Dries committed
263 264
    }

265 266 267
    if ($op == t('Remove from book outline')) {
      db_query('DELETE FROM {book} WHERE nid = %d', $node->nid);
      drupal_set_message(t('removed the node form the book.'));
Dries's avatar
 
Dries committed
268 269
    }

Dries's avatar
 
Dries committed
270
    $output .= '<h3>'. t('Edit book outline for node "%booktitle"', array('%booktitle' => '<em>'. $node->title .'</em>')) .'</h3>';
Dries's avatar
 
Dries committed
271

272 273
    if ($edit['nid']) {
      $page = db_fetch_object(db_query('SELECT * FROM {book} WHERE nid = %d', $node->nid));
Dries's avatar
 
Dries committed
274

275 276
      $output .= form_select(t('Parent'), 'parent', $page->parent, book_toc(), t('The parent subject or category the page belongs in.'));
      $output .= form_weight(t('Weight'), 'weight', $node->weight, 15, t('The heavier pages will sink and the lighter pages will be positioned nearer the top.'));
Dries's avatar
 
Dries committed
277 278

      if ($page->nid) {
279 280
        $output .= form_submit(t('Update book outline'));
        $output .= form_submit(t('Remove from book outline'));
Dries's avatar
 
Dries committed
281 282
      }
      else {
283
        $output .= form_submit(t('Add to book outline'));
Dries's avatar
 
Dries committed
284 285 286 287
      }

    }
    else {
288
      $output .= form_submit(t('Edit book outline'));
Dries's avatar
 
Dries committed
289 290
    }

291
    $output .= form_hidden('nid', $node->nid);
Dries's avatar
 
Dries committed
292

293
    return form($output, 'post', url('admin/node/book'));
Dries's avatar
 
Dries committed
294 295 296
  }
}

297 298 299
/**
 * Return the the most recent revision that matches the specified conditions.
 */
Dries's avatar
 
Dries committed
300 301 302 303 304 305
function book_revision_load($page, $conditions = array()) {

  $revisions = array_reverse(node_revision_list($page));

  foreach ($revisions as $revision) {

Dries's avatar
 
Dries committed
306
    // Extract the specified revision:
Dries's avatar
 
Dries committed
307 308
    $node = node_revision_load($page, $revision);

Dries's avatar
 
Dries committed
309 310
    // Check to see if the conditions are met:
    $status = TRUE;
Dries's avatar
 
Dries committed
311 312 313

    foreach ($conditions as $key => $value) {
      if ($node->$key != $value) {
Dries's avatar
 
Dries committed
314
        $status = FALSE;
Dries's avatar
 
Dries committed
315 316 317 318 319 320 321 322 323
      }
    }

    if ($status) {
      return $node;
    }
  }
}

324 325 326
/**
 * Return the path (call stack) to a certain book page.
 */
Dries's avatar
 
Dries committed
327
function book_location($node, $nodes = array()) {
328
  $parent = db_fetch_object(db_query('SELECT n.nid, n.title, b.parent FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE n.nid = %d', $node->parent));
Dries's avatar
 
Dries committed
329 330 331 332 333 334 335
  if ($parent->title) {
    $nodes = book_location($parent, $nodes);
    array_push($nodes, $parent);
  }
  return $nodes;
}

Dries's avatar
 
Dries committed
336
function book_location_down($node, $nodes = array()) {
337
  $last_direct_child = db_fetch_object(db_query('SELECT n.nid, n.title, b.parent FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE b.parent = %d ORDER BY b.weight DESC, n.title DESC', $node->nid));
Dries's avatar
 
Dries committed
338 339 340 341 342 343 344
  if ($last_direct_child) {
    array_push($nodes, $last_direct_child);
    $nodes = book_location_down($last_direct_child, $nodes);
  }
  return $nodes;
}

345 346 347
/**
 * Fetch the node object of the previous page of the book.
 */
Dries's avatar
 
Dries committed
348
function book_prev($node) {
Dries's avatar
 
Dries committed
349
  // If the parent is zero, we are at the start of a book so there is no previous.
Dries's avatar
 
Dries committed
350 351 352 353
  if ($node->parent == 0) {
    return NULL;
  }

Dries's avatar
 
Dries committed
354
  // Previous on the same level:
Dries's avatar
 
Dries committed
355
  $direct_above = db_fetch_object(db_query("SELECT n.nid, n.title FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE b.parent = %d AND n.status = 1 AND (n.moderate = 0 OR n.revisions != '') AND (b.weight < %d OR (b.weight = %d AND n.title < '%s')) ORDER BY b.weight DESC, n.title DESC", $node->parent, $node->weight, $node->weight, $node->title));
Dries's avatar
 
Dries committed
356
  if ($direct_above) {
Dries's avatar
 
Dries committed
357
    // Get last leaf of $above.
Dries's avatar
 
Dries committed
358
    $path = book_location_down($direct_above);
Dries's avatar
 
Dries committed
359 360

    return $path ? (count($path) > 0 ? array_pop($path) : NULL) : $direct_above;
Dries's avatar
 
Dries committed
361 362
  }
  else {
Dries's avatar
 
Dries committed
363
    // Direct parent:
Dries's avatar
 
Dries committed
364
    $prev = db_fetch_object(db_query("SELECT n.nid, n.title FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE n.nid = %d AND n.status = 1 AND (n.moderate = 0 OR n.revisions != '')", $node->parent));
Dries's avatar
 
Dries committed
365 366 367 368
    return $prev;
  }
}

369 370 371
/**
 * Fetch the node object of the next page of the book.
 */
Dries's avatar
 
Dries committed
372 373
function book_next($node) {
  // get first direct child
Dries's avatar
 
Dries committed
374
  $child = db_fetch_object(db_query("SELECT DISTINCT(n.nid), n.title FROM {node} n ". node_access_join_sql() ." INNER JOIN {book} b ON n.nid = b.nid WHERE b.parent = %d AND n.status = 1 AND ". node_access_where_sql() ." AND (n.moderate = 0 OR n.revisions != '') ORDER BY b.weight ASC, n.title ASC", $node->nid));
Dries's avatar
 
Dries committed
375 376 377 378
  if ($child) {
    return $child;
  }

Dries's avatar
 
Dries committed
379 380
  // No direct child: get next for this level or any parent in this book.
  array_push($path = book_location($node), $node); // Path to top-level node including this one.
381

Dries's avatar
 
Dries committed
382
  while (($leaf = array_pop($path)) && count($path)) {
Dries's avatar
 
Dries committed
383
    $next = db_fetch_object(db_query("SELECT DISTINCT(n.nid), n.title FROM {node} n ". node_access_join_sql() ." INNER JOIN {book} b ON n.nid = b.nid WHERE b.parent = %d AND n.status = 1 AND ". node_access_where_sql() ." AND (n.moderate = 0 OR n.revisions != '') AND (b.weight > %d OR (b.weight = %d AND n.title > '%s')) ORDER BY b.weight ASC, n.title ASC", $leaf->parent, $leaf->weight, $leaf->weight, $leaf->title));
Dries's avatar
 
Dries committed
384 385 386 387 388 389
    if ($next) {
      return $next;
    }
  }
}

390 391 392
/**
 * Implementation of hook_content().
 */
Dries's avatar
 
Dries committed
393
function book_content($node, $teaser = FALSE) {
394
  $op = $_POST['op'];
Dries's avatar
 
Dries committed
395

Dries's avatar
 
Dries committed
396 397 398
  // Always display the most recently approved revision of a node
  // (if any) unless we have to display this page in the context of
  // the moderation queue.
399 400
  if ($op != t('Preview') && $node->moderate && arg(0) != 'queue') {
    $revision = book_revision_load($node, array('moderate' => 0, 'status' => 1));
Dries's avatar
 
Dries committed
401 402 403 404

    if ($revision) {
      $node = $revision;
    }
Dries's avatar
 
Dries committed
405 406
  }

Dries's avatar
 
Dries committed
407 408
  // Extract the page body.  If body is dynamic (using PHP code), the body
  // will be generated.
Dries's avatar
 
Dries committed
409 410
  if ($node->format == 1) {
    // Make sure only authorized users can preview PHP pages.
411
    if ($op == t('Preview') && !user_access('create php content')) {
Dries's avatar
 
Dries committed
412 413 414 415 416
      return;
    }

    ob_start();
    eval($node->body);
Dries's avatar
 
Dries committed
417
    $node->body = ob_get_contents();
Dries's avatar
 
Dries committed
418
    ob_end_clean();
Dries's avatar
 
Dries committed
419 420
    $node->teaser = node_teaser($node->body);
    $node->readmore = (strlen($node->teaser) < strlen($node->body));
Dries's avatar
 
Dries committed
421 422
  }
  else {
Dries's avatar
 
Dries committed
423
    $node = node_prepare($node, $teaser);
Dries's avatar
 
Dries committed
424
  }
Dries's avatar
 
Dries committed
425

Dries's avatar
 
Dries committed
426 427 428
  return $node;
}

429 430 431 432 433 434
/**
 * Implementation of hook_view().
 *
 * If not displayed on the main page, we render the node as a page in the
 * book with extra links to the previous and next pages.
 */
Dries's avatar
 
Dries committed
435
function book_view(&$node, $teaser = FALSE, $page = FALSE) {
Dries's avatar
 
Dries committed
436
  $node = book_content($node, $teaser);
Dries's avatar
 
Dries committed
437

Dries's avatar
 
Dries committed
438 439
  if (!$teaser && $node->moderate) {
    $node->body .= '<div class="log"><div class="title">'. t('Log') .':</div>'. $node->log .'</div>';
Dries's avatar
 
Dries committed
440 441 442
  }
}

443
/**
Dries's avatar
 
Dries committed
444 445 446
 * Implementation of hook_nodeapi().
 *
 * Appends book navigation to all nodes in the book.
447
 */
Dries's avatar
 
Dries committed
448 449 450 451
function book_nodeapi(&$node, $op, $teaser, $page) {
  switch ($op) {
    case 'view':
      if (!$teaser) {
452
        $book = db_fetch_object(db_query('SELECT * FROM {book} WHERE nid = %d', $node->nid));
Dries's avatar
 
Dries committed
453

Dries's avatar
 
Dries committed
454 455 456 457 458 459
        if ($book) {
          foreach ($book as $key => $value) {
            $node->$key = $value;
          }
          $node = book_navigation($node);
        }
Dries's avatar
 
Dries committed
460 461 462
        if ($page) {
          menu_set_location($node->breadcrumb);
        }
Dries's avatar
 
Dries committed
463
      }
Dries's avatar
 
Dries committed
464
      break;
Dries's avatar
 
Dries committed
465
  }
Dries's avatar
 
Dries committed
466
}
Dries's avatar
 
Dries committed
467

468 469 470 471
/**
 * Prepares both the custom breadcrumb trail and the forward/backward
 * navigation for a node presented as a book page.
 */
Dries's avatar
 
Dries committed
472
function book_navigation($node) {
Dries's avatar
 
Dries committed
473
  $path = book_location($node);
Dries's avatar
 
Dries committed
474

Dries's avatar
 
Dries committed
475
  // Construct the breadcrumb:
Dries's avatar
 
Dries committed
476

Dries's avatar
 
Dries committed
477
  $node->breadcrumb = array(); // Overwrite the trail with a book trail.
Dries's avatar
 
Dries committed
478
  foreach ($path as $level) {
Dries's avatar
 
Dries committed
479
    $node->breadcrumb[] = array('path' => 'node/'. $level->nid, 'title' =>  $level->title);
Dries's avatar
 
Dries committed
480
  }
Dries's avatar
 
Dries committed
481
  $node->breadcrumb[] = array('path' => 'node/'. $node->nid);
Dries's avatar
 
Dries committed
482

Dries's avatar
 
Dries committed
483
  if ($node->nid) {
484
    $output .= '<div class="book">';
Dries's avatar
 
Dries committed
485 486

    if ($tree = book_tree($node->nid)) {
487
      $output .= '<div class="tree">'. book_tree($node->nid) .'</div>';
Dries's avatar
 
Dries committed
488
    }
Dries's avatar
 
Dries committed
489

Dries's avatar
 
Dries committed
490
    if ($prev = book_prev($node)) {
491
      $links .= '<div class="prev">';
Dries's avatar
 
Dries committed
492
      $links .= l(t('previous'), 'node/'. $prev->nid, array('title' => t('View the previous page.')));
493
      $links .= '</div>';
Dries's avatar
 
Dries committed
494
      $titles .= '<div class="prev">'. $prev->title .'</div>';
Dries's avatar
 
Dries committed
495 496
    }
    else {
Dries's avatar
 
Dries committed
497
      $links .= '<div class="prev">&nbsp;</div>'; // Make an empty div to fill the space.
Dries's avatar
 
Dries committed
498 499
    }
    if ($next = book_next($node)) {
500
      $links .= '<div class="next">';
Dries's avatar
 
Dries committed
501
      $links .= l(t('next'), 'node/'. $next->nid, array('title' => t('View the next page.')));
502
      $links .= '</div>';
Dries's avatar
 
Dries committed
503
      $titles .= '<div class="next">'. $next->title .'</div>';
Dries's avatar
 
Dries committed
504 505
    }
    else {
Dries's avatar
 
Dries committed
506
      $links .= '<div class="next">&nbsp;</div>'; // Make an empty div to fill the space.
Dries's avatar
 
Dries committed
507 508
    }
    if ($node->parent) {
509
      $links .= '<div class="up">';
Dries's avatar
 
Dries committed
510
      $links .= l(t('up'), 'node/'. $node->parent, array('title' => t('View this page\'s parent section.')));
511
      $links .= '</div>';
Dries's avatar
 
Dries committed
512
    }
Dries's avatar
 
Dries committed
513

514
    $output .= '<div class="nav">';
Dries's avatar
 
Dries committed
515 516
    $output .= ' <div class="links">'. $links .'</div>';
    $output .= ' <div class="titles">'. $titles .'</div>';
517 518
    $output .= '</div>';
    $output .= '</div>';
Dries's avatar
 
Dries committed
519
  }
Dries's avatar
 
Dries committed
520

Dries's avatar
 
Dries committed
521
  $node->body = $node->body.$output;
Dries's avatar
 
Dries committed
522

Dries's avatar
 
Dries committed
523
  return $node;
Dries's avatar
 
Dries committed
524
}
Dries's avatar
 
Dries committed
525

Dries's avatar
 
Dries committed
526 527 528 529
function book_toc_recurse($nid, $indent, $toc, $children) {

  if ($children[$nid]) {
    foreach ($children[$nid] as $foo => $node) {
Dries's avatar
 
Dries committed
530 531
      $toc[$node->nid] = $indent .' '. $node->title;
      $toc = book_toc_recurse($node->nid, $indent .'--', $toc, $children);
Dries's avatar
 
Dries committed
532 533 534 535 536 537
    }
  }

  return $toc;
}

538
function book_toc($parent = 0, $indent = '', $toc = array()) {
Dries's avatar
 
Dries committed
539
  $result = db_query('SELECT DISTINCT(n.nid), n.title, b.parent FROM {node} n '. node_access_join_sql() .' INNER JOIN {book} b ON n.nid = b.nid WHERE n.status = 1 AND '. node_access_where_sql() .' ORDER BY b.weight, n.title');
Dries's avatar
 
Dries committed
540

Dries's avatar
 
Dries committed
541
  while ($node = db_fetch_object($result)) {
Dries's avatar
 
Dries committed
542 543 544 545
    if (!$children[$node->parent]) {
      $children[$node->parent] = array();
    }
    array_push($children[$node->parent], $node);
Dries's avatar
 
Dries committed
546
  }
Dries's avatar
 
Dries committed
547

Dries's avatar
 
Dries committed
548 549
  // If the user is an administrator, add the top-level book page;
  // only administrators can start new books.
550 551
  if (user_access('administer nodes')) {
    $toc[0] = '<'. t('top-level') .'>';
Dries's avatar
 
Dries committed
552 553
  }

Dries's avatar
 
Dries committed
554
  $toc = book_toc_recurse($parent, $indent, $toc, $children);
Dries's avatar
 
Dries committed
555

Dries's avatar
 
Dries committed
556 557 558
  return $toc;
}

Dries's avatar
 
Dries committed
559
function book_tree_recurse($nid, $depth, $children, $unfold = array()) {
Dries's avatar
 
Dries committed
560
  if ($depth > 0) {
Dries's avatar
 
Dries committed
561 562
    if ($children[$nid]) {
      foreach ($children[$nid] as $foo => $node) {
Dries's avatar
 
Dries committed
563 564 565
        if (in_array($node->nid, $unfold)) {
          if ($tree = book_tree_recurse($node->nid, $depth - 1, $children, $unfold)) {
            $output .= '<li class="expanded">';
Dries's avatar
 
Dries committed
566 567
            $output .= l($node->title, 'node/'. $node->nid);
            $output .= '<ul>'. $tree .'</ul>';
Dries's avatar
 
Dries committed
568 569 570
            $output .= '</li>';
          }
          else {
Dries's avatar
 
Dries committed
571
            $output .= '<li class="leaf">'. l($node->title, 'node/'. $node->nid) .'</li>';
Dries's avatar
 
Dries committed
572 573 574 575
          }
        }
        else {
          if ($tree = book_tree_recurse($node->nid, 1, $children)) {
Dries's avatar
 
Dries committed
576
            $output .= '<li class="collapsed">'. l($node->title, 'node/'. $node->nid) .'</li>';
Dries's avatar
 
Dries committed
577 578
          }
          else {
Dries's avatar
 
Dries committed
579
            $output .= '<li class="leaf">'. l($node->title, 'node/'. $node->nid) .'</li>';
Dries's avatar
 
Dries committed
580
          }
Dries's avatar
 
Dries committed
581
        }
Dries's avatar
 
Dries committed
582 583
      }
    }
Dries's avatar
 
Dries committed
584 585 586 587 588
  }

  return $output;
}

Dries's avatar
 
Dries committed
589
function book_tree($parent = 0, $depth = 3, $unfold = array()) {
Dries's avatar
 
Dries committed
590
  $result = db_query('SELECT DISTINCT(n.nid), n.title, b.parent FROM {node} n '. node_access_join_sql() .' INNER JOIN {book} b ON n.nid = b.nid WHERE n.status = 1 AND '. node_access_where_sql() .' AND n.moderate = 0 ORDER BY b.weight, n.title');
Dries's avatar
 
Dries committed
591

Dries's avatar
 
Dries committed
592 593 594 595
  while ($node = db_fetch_object($result)) {
    $list = $children[$node->parent] ? $children[$node->parent] : array();
    array_push($list, $node);
    $children[$node->parent] = $list;
Dries's avatar
 
Dries committed
596
  }
Dries's avatar
 
Dries committed
597

Dries's avatar
 
Dries committed
598
  if ($tree = book_tree_recurse($parent, $depth, $children, $unfold)) {
Dries's avatar
 
Dries committed
599
    return '<ul>'. $tree .'</ul>';
Dries's avatar
 
Dries committed
600
  }
Dries's avatar
 
Dries committed
601 602
}

603
/**
Dries's avatar
Dries committed
604
 * Menu callback; prints a listing of all books.
605
 */
Dries's avatar
 
Dries committed
606
function book_render() {
607
  $result = db_query('SELECT n.nid FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE b.parent = 0 AND n.status = 1 AND (n.moderate = 0 OR n.revisions IS NOT NULL) ORDER BY b.weight, n.title');
Dries's avatar
 
Dries committed
608

Dries's avatar
 
Dries committed
609
  while ($page = db_fetch_object($result)) {
Dries's avatar
 
Dries committed
610
    // Load the node:
611
    $node = node_load(array('nid' => $page->nid));
Dries's avatar
 
Dries committed
612

Dries's avatar
 
Dries committed
613
    if ($node) {
Dries's avatar
 
Dries committed
614
      // Take the most recent approved revision, extract the page and check output:
Dries's avatar
 
Dries committed
615
      $node = book_content($node);
Dries's avatar
 
Dries committed
616
      // Output the content:
617
      $output .= '<div class="book">';
Dries's avatar
 
Dries committed
618
      $output .= '<div class="title">'. l($node->title, 'node/'. $node->nid) .'</div>';
619
      $output .= '<div class="body">'. $node->teaser .'</div>';
620
      $output .= '</div>';
Dries's avatar
 
Dries committed
621
    }
Dries's avatar
 
Dries committed
622 623
  }

624 625
  drupal_set_title(t('Books'));
  print theme('page', $output);
Dries's avatar
 
Dries committed
626 627
}

628
/**
Dries's avatar
 
Dries committed
629
 * Menu callback; generates printer-friendly book page with all descendants.
630 631
 */
function book_print($nid = 0, $depth = 1) {
Dries's avatar
 
Dries committed
632
  global $base_url;
Dries's avatar
 
Dries committed
633
  $result = db_query('SELECT DISTINCT(n.nid) FROM {node} n '. node_access_join_sql() .' INNER JOIN {book} b ON n.nid = b.nid WHERE n.status = 1 AND '. node_access_where_sql() .' AND n.nid = %d AND (n.moderate = 0 OR n.revisions IS NOT NULL) ORDER BY b.weight, n.title', $nid);
Dries's avatar
 
Dries committed
634

Dries's avatar
 
Dries committed
635 636
  while ($page = db_fetch_object($result)) {
    // load the node:
637
    $node = node_load(array('nid' => $page->nid));
Dries's avatar
 
Dries committed
638

Dries's avatar
 
Dries committed
639 640
    if ($node) {
      // output the content:
641 642
      if (node_hook($node, 'content')) {
        $node = node_invoke($node, 'content');
Dries's avatar
 
Dries committed
643
      }
Dries's avatar
 
Dries committed
644
      $output .= '<h1 id="'. $node->nid .'" name="'. $node->nid .'" class="book-h'. $depth .'">'. $node->title .'</h1>';
Dries's avatar
 
Dries committed
645

Dries's avatar
 
Dries committed
646
      if ($node->body) {
Dries's avatar
 
Dries committed
647
        $output .= $node->body;
Dries's avatar
 
Dries committed
648
      }
Dries's avatar
 
Dries committed
649
    }
Dries's avatar
 
Dries committed
650
  }
Dries's avatar
 
Dries committed
651

652
  $output .= book_print_recurse($nid, $depth);
Dries's avatar
 
Dries committed
653

Dries's avatar
 
Dries committed
654 655
  $html = '<html><head><title>'. $node->title .'</title>';
  $html .= '<base href="'. $base_url .'/" />';
Dries's avatar
 
Dries committed
656
  $html .= "<style type=\"text/css\">\n@import url(misc/print.css);\n</style>";
657
  $html .= '</head><body>'. $output .'</body></html>';
Dries's avatar
 
Dries committed
658

659
  print $html;
Dries's avatar
 
Dries committed
660 661
}

662
function book_print_recurse($parent = '', $depth = 1) {
Dries's avatar
 
Dries committed
663
  $result = db_query("SELECT DISTINCT(n.nid) FROM {node} n ". node_access_join_sql() ." INNER JOIN {book} b ON n.nid = b.nid WHERE n.status = 1 AND ". node_access_where_sql() ." AND b.parent = '$parent' AND (n.moderate = 0 OR n.revisions IS NOT NULL) ORDER BY b.weight, n.title");
Dries's avatar
 
Dries committed
664

Dries's avatar
 
Dries committed
665
  while ($page = db_fetch_object($result)) {
Dries's avatar
 
Dries committed
666
    // Load the node:
667
    $node = node_load(array('nid' => $page->nid));
Dries's avatar
 
Dries committed
668

Dries's avatar
 
Dries committed
669
    // Take the most recent approved revision:
Dries's avatar
 
Dries committed
670
    if ($node->moderate) {
671
      $node = book_revision_load($node, array('moderate' => 0, 'status' => 1));
Dries's avatar
 
Dries committed
672 673
    }

Dries's avatar
 
Dries committed
674
    if ($node) {
Dries's avatar
 
Dries committed
675
      // Output the content:
676 677
      if (node_hook($node, 'content')) {
        $node = node_invoke($node, 'content');
Dries's avatar
 
Dries committed
678
      }
Dries's avatar
 
Dries committed
679
      $output .= '<h1 id="'. $node->nid .'" name="'. $node->nid .'" class="book-h'. $depth .'">'. $node->title .'</h1>';
Dries's avatar
 
Dries committed
680

Dries's avatar
 
Dries committed
681
      if ($node->body) {
682
        $output .= '<ul>'. $node->body .'</ul>';
Dries's avatar
 
Dries committed
683
      }
Dries's avatar
 
Dries committed
684

685
      $output .= book_print_recurse($node->nid, $depth + 1);
Dries's avatar
 
Dries committed
686
    }
Dries's avatar
 
Dries committed
687
  }
Dries's avatar
 
Dries committed
688

Dries's avatar
 
Dries committed
689 690
  return $output;
}
Dries's avatar
 
Dries committed
691

Dries's avatar
 
Dries committed
692
function book_admin_view_line($node, $depth = 0) {
Dries's avatar
 
Dries committed
693
  return array('<div style="padding-left: '. (25 * $depth) .'px;">'. form_textfield(NULL, $node->nid .'][title', $node->title, 64, 255) .'</div>', form_weight(NULL, $node->nid .'][weight', $node->weight), l(t('view node'), 'node/'. $node->nid), l(t('edit node'), 'node/'. $node->nid .'/edit'), l(t('delete node'), 'admin/node/delete/'. $node->nid));
Dries's avatar
 
Dries committed
694 695 696
}

function book_admin_view_book($nid, $depth = 1) {
Dries's avatar
 
Dries committed
697
  $result = db_query("SELECT n.nid FROM {node} n INNER JOIN {book} b ON n.nid = b.nid WHERE b.parent = %d ORDER BY b.weight, n.title", $nid);
Dries's avatar
 
Dries committed
698 699

  while ($node = db_fetch_object($result)) {
Dries's avatar
 
Dries committed
700
    $node = node_load(array('nid' => $node->nid));
Dries's avatar
 
Dries committed
701 702
    $rows[] = book_admin_view_line($node, $depth);
    $rows = array_merge($rows, book_admin_view_book($node->nid, $depth + 1));
Dries's avatar
 
Dries committed
703 704
  }

Dries's avatar
 
Dries committed
705
  return $rows;
Dries's avatar
 
Dries committed
706 707
}

708 709 710
/**
 * Display an administrative view of the hierarchy of a book.
 */
Dries's avatar
 
Dries committed
711
function book_admin_view($nid, $depth = 0) {
Dries's avatar
 
Dries committed
712
  if ($nid) {
Dries's avatar
 
Dries committed
713
    $node = node_load(array('nid' => $nid));
Dries's avatar
 
Dries committed
714

Dries's avatar
 
Dries committed
715
    $output .= '<h3>'. $node->title .'</h3>';
Dries's avatar
 
Dries committed
716

Dries's avatar
 
Dries committed
717
    $header = array(t('title'), t('weight'), array('data' => t('operations'), 'colspan' => 3));
Dries's avatar
 
Dries committed
718 719
    $rows[] = book_admin_view_line($node);
    $rows = array_merge($rows, book_admin_view_book($nid));
Dries's avatar
 
Dries committed
720

Dries's avatar
 
Dries committed
721 722
    $output .= theme('table', $header, $rows);
    $output .= form_submit(t('Save book pages'));
Dries's avatar
 
Dries committed
723

Dries's avatar
 
Dries committed
724 725
    return form($output);
  }
Dries's avatar
 
Dries committed
726 727 728
}

function book_admin_save($nid, $edit = array()) {
Dries's avatar
 
Dries committed
729
  if ($nid) {
Dries's avatar
 
Dries committed
730
    $book = node_load(array('nid' => $nid));
Dries's avatar
 
Dries committed
731

Dries's avatar
 
Dries committed
732
    foreach ($edit as $nid => $value) {
Dries's avatar
 
Dries committed
733 734 735 736
      // Check to see whether the title needs updating:
      $title = db_result(db_query('SELECT title FROM {node} WHERE nid = %d', $nid));
      if ($title != $value['title']) {
        db_query("UPDATE {node} SET title = '%s' WHERE nid = %d", $value['title'], $nid);
Dries's avatar
 
Dries committed
737
      }
Dries's avatar
 
Dries committed
738

Dries's avatar
 
Dries committed
739 740 741 742
      // Check to see whether the weight needs updating:
      $weight = db_result(db_query('SELECT weight FROM {book} WHERE nid = %d', $nid));
      if ($weight != $value['weight']) {
        db_query('UPDATE {book} SET weight = %d WHERE nid = %d', $value['weight'], $nid);
Dries's avatar
 
Dries committed
743
      }
Dries's avatar
 
Dries committed
744 745
    }

746 747
    $message = t('updated book "%title"', array('%title' => $book->title));
    watchdog('special', $message);
Dries's avatar
 
Dries committed
748

Dries's avatar
 
Dries committed
749 750
    return $message;
  }
Dries's avatar
 
Dries committed
751 752
}

753
/**
Dries's avatar
Dries committed
754
 * Menu callback; displays a listing of all orphaned book pages.
755
 */
Dries's avatar
 
Dries committed
756
function book_admin_orphan() {
Dries's avatar
 
Dries committed
757
  $result = db_query('SELECT n.nid, n.title, n.status, b.parent FROM {node} n INNER JOIN {book} b ON n.nid = b.nid');
Dries's avatar
 
Dries committed
758 759 760 761 762

  while ($page = db_fetch_object($result)) {
    $pages[$page->nid] = $page;
  }

Dries's avatar
 
Dries committed
763
  if ($pages) {
764
    $output .= '<h3>'. t('Orphan pages') .'</h3>';
Dries's avatar
 
Dries committed
765
    $header = array(t('title'), t('weight'), array('data' => t('operations'), 'colspan' => 3));
Dries's avatar
 
Dries committed
766 767
    foreach ($pages as $nid => $node) {
      if ($node->parent && empty($pages[$node->parent])) {
Dries's avatar
 
Dries committed
768 769
        $rows[] = book_admin_view_line($node, $depth);
        $rows = array_merge($rows, book_admin_view_book($node->nid, $depth + 1));
Dries's avatar
 
Dries committed
770
      }
Dries's avatar
 
Dries committed
771
    }
Dries's avatar
 
Dries committed
772
    $output .= theme('table', $header, $rows);
Dries's avatar
 
Dries committed
773 774
  }

Dries's avatar
 
Dries committed
775
  print theme('page', $output);
Dries's avatar
 
Dries committed
776 777
}

778
/**
Dries's avatar
Dries committed
779
 * Menu callback; displays the book administration page.
780
 */
Dries's avatar
Dries committed
781
function book_admin($nid = 0) {
Dries's avatar
 
Dries committed
782 783
  $op = $_POST['op'];
  $edit = $_POST['edit'];
Dries's avatar
 
Dries committed
784

Dries's avatar
 
Dries committed
785
  switch ($op) {
Dries's avatar
 
Dries committed
786 787 788 789
    case t('Edit book outline'):
    case t('Add to book outline'):
    case t('Remove from book outline'):
    case t('Update book outline'):
Dries's avatar
 
Dries committed
790 791
      $output = book_node_link();
      break;
Dries's avatar
 
Dries committed
792
    case t('Save book pages'):
793
      drupal_set_message(book_admin_save($nid, $edit));
Dries's avatar
 
Dries committed
794 795
      // fall through:
    default:
796
      $output .= book_admin_view($nid);
Dries's avatar
 
Dries committed
797
      break;
Dries's avatar
 
Dries committed
798
  }
Dries's avatar
 
Dries committed
799
  print theme('page', $output);
Dries's avatar
 
Dries committed
800 801
}

802 803 804
/**
 * Implementation of hook_help().
 */
Dries's avatar
 
Dries committed
805
function book_help($section) {
Dries's avatar
 
Dries committed
806
  switch ($section) {
Dries's avatar
 
Dries committed
807
    case 'admin/help#book':
Dries's avatar
 
Dries committed
808
      return t("
Dries's avatar
 
Dries committed
809
      <p>The book organises content into a nested hierarchical structure. It is particularly good for manuals, Frequently Asked Questions (FAQs) and the like, allowing you to have chapters, sections, etc.</p>
810
      <p>A book is simply a collection of nodes that have been linked together. These nodes are usually of type <em>book page</em>, but you can insert nodes of any type into a book outline. Every node in the book has a <em>parent</em> node which  \"contains\" it. This is how book.module establishes its hierarchy. At any given level in the hierarchy, a book can contain many nodes. All these sibling nodes are sorted according to the <em>weight</em> that you give them.</p>
811
      <p>A book page is a special node type that allows you to embed PHP within the body of the page. This capability is only offered to administrators, since malicious users could abuse this power. In addition, book pages contain a <em>log message</em> field which helps your users understand the motivation behind an edit of a book page. Each edited version of a book page is stored as a new revision of a node. This capability makes it easy to revert to an old version of a page, should that be desirable.</p>
812
      <p>Like other node types, book submissions and edits may be subject to moderation, depending on your configuration.  Similarly, books use <a href=\"%permissions\">permissions</a> to determine who may read and write to them. Only administrators are allowed to create new books, which are really just nodes whose parent is <em>&lt;top-level&gt;</em>. To include an existing node in your book, click on the \"administer\"-link in that node.  At the bottom of this administration page, click on the <em>edit book outline</em> button. This enables you to place the node wherever you'd like within the book hierarchy. To add a new node into your book, use the <a href=\"%create\">create content &raquo; book page</a> link.</p>
813
      <p>Administrators may review the hierarchy of their books by clicking on the <a href=\"%collaborative-book\">collaborative book</a> link in the adminstration pages. There, nodes may be edited, reorganized, removed from book, and deleted. This behavior may change in the future. When a parent node is deleted, it may leave behind child nodes.  These nodes are now <em>orphans</em>. Administrators should periodically <a href=\"%orphans-book\">review their books for orphans</a> and reaffiliate those pages as desired. Finally, administrators may also <a href=\"%export-book\">export their books</a> to a single, flat HTML page which is suitable for printing.</p>
Dries's avatar
 
Dries committed
814 815
      <h3>Maintaining a FAQ using a collaborative book</h3>
      <p>Collaborative books let you easily set up a Frequently Asked Questions (FAQ) section on your web site. The main benefit is that you don't have to write all the questions/answers by yourself - let the community do it for you!</p>
816
      <p>In order to set up the FAQ, you have to create a new book which will hold all your content. To do so, click on the <a href=\"%create\">create content &raquo; book page</a> link. Give it a thoughtful title, and body. A title like \"Estonia Travel - FAQ\" is nice. You may always edit these fields later. You will probably want to designate <em>&lt;top-level&gt;</em> as the parent of this page. Leave the <em>log message</em> and <em>type</em> fields blank for now. After you have submitted this book page, you are ready to begin filling up your book with questions that are frequently asked.</p>
817
      <p>Whenever you come across a post which you want to include in your FAQ, click on the <em>administer</em> link. Then click on the <em>edit book outline</em> button at the bottom of the page. Then place the relevant post wherever is most appropriate in your book by selecting a <em>parent</em>. Books are quite flexible. They can have sections like <em>Flying to Estonia</em>, <em>Eating in Estonia</em> and so on. As you get more experienced with the book module, you can reorganize posts in your book so that it stays organized.</p>
818
      <p>Notes:</p><ul><li>Any comments attached to those relevant posts which you designate as book pages will also be transported into your book. This is a great feature, since much wisdom is shared via comments. Remember that all future comments and edits will automatically be reflected in your book.</li><li>You may wish to edit the title of posts when adding them to your FAQ. This is done on the same page as the <em>Edit book outline</em> button. Clear titles improve navigability enormously.</li><li>Book pages may come from any content type (blog, story, page, etc.). If you are creating a post solely for inclusion in your book, then use the <a href=\"%create\">create content &raquo; book page</a> link.</li><li>If you don't see the <em>administer</em> link, then you probably have insufficient <a href=\"%permissions\">permissions</a>.</li><li>If you want to get really fancy, note that books are one of the few content types which allow raw PHP in their <em>body</em>. So you've got lots of geeky possibilities there.</li></ul>", array("%permissions" => url("admin/user/configure/permission"), "%create" => url("node/add/book"), "%collaborative-book" => url("admin/node/book"), "%orphans-book" => url("admin/node/book/orphan"), "%export-book" => url("book/print")));
Dries's avatar
 
Dries committed
819
    case 'admin/modules#description':
Dries's avatar
 
Dries committed
820
      return t('Allows users to collaboratively author a book.');
Dries's avatar
 
Dries committed
821
    case 'admin/node/book':
Dries's avatar
 
Dries committed
822
      return t('The book module offers a mean to organize content, authored by many users, in an online manual, outline or FAQ.');
Dries's avatar
 
Dries committed
823
    case 'admin/node/book/orphan':
Dries's avatar
 
Dries committed
824
      return t('Pages in a book are like a tree. As pages are edited, reorganized and removed, child pages might be left with no link to the rest of the book.  Such pages are referred to as "orphan pages".  On this page, administrators can review their books for orphans and reattach those pages as desired.');
Dries's avatar
 
Dries committed
825
    case 'node/add#book':
Dries's avatar
 
Dries committed
826
      return t("A book is a collaborative writing effort: users can collaborate writing the pages of the book, positioning the pages in the right order, and reviewing or modifying pages previously written.  So when you have some information to share or when you read a page of the book and you didn't like it, or if you think a certain page could have been written better, you can do something about it.");
Dries's avatar
 
Dries committed
827
  }
828
}
Dries's avatar
 
Dries committed
829 830

function book_help_page() {
Dries's avatar
 
Dries committed
831
  print theme('page', book_help('admin/help#book'));
Dries's avatar
 
Dries committed
832
}
Dries's avatar
 
Dries committed
833

Dries's avatar
 
Dries committed
834
?>