summaryrefslogtreecommitdiff
path: root/modules/shortcut/shortcut.module
blob: 348c6f7250e351e5a58c7aa1ebd09229a3f90701 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
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
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
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
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
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
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
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
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
<?php
// $Id$

/**
 * @file
 * Allows users to manage customizable lists of shortcut links.
 */

/**
 * The name of the default shortcut set.
 *
 * This set will be displayed to any user that does not have another set
 * assigned, unless overridden by a hook_shortcut_default_set() implementation.
 */
define('SHORTCUT_DEFAULT_SET_NAME', 'shortcut-set-1');

/**
 * Implements hook_help().
 */
function shortcut_help($path, $arg) {
  global $user;

  switch ($path) {
    case 'admin/help#shortcut':
      $output = '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Shortcut module allows users to create sets of <em>shortcut</em> links to commonly-visited pages of the site. Shortcuts are contained within <em>sets</em>. Each user with <em>Select any shortcut set</em> permission can select a shortcut set created by anyone at the site. For more information, see the online handbook entry for <a href="@shortcut">Shortcut module</a>.', array('@shortcut' => 'http://drupal.org/handbook/modules/shortcut/')) . '</p>';
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl><dt>' . t('Administering shortcuts') . '</dt>';
      $output .= '<dd>' . t('Users with the <em>Administer shortcuts</em> permission can manage shortcut sets and edit the shortcuts within sets from the <a href="@shortcuts">Shortcuts administration page</a>.', array('@shortcuts' => url('admin/config/user-interface/shortcut'))) . '</dd>';
      $output .= '<dt>' . t('Choosing shortcut sets') . '</dt>';
      $output .= '<dd>' . t('Users with permission to switch shortcut sets can choose a shortcut set to use from the Shortcuts tab of their user account page.') . '</dd>';
      $output .= '<dt>' . t('Adding and removing shortcuts') . '</dt>';
      $output .= '<dd>' . t('The Shortcut module creates an add/remove link for each page on your site; the link lets you add or remove the current page from the currently-enabled set of shortcuts (if your theme displays it and you have permission to edit your shortcut set). The core Seven administration theme displays this link next to the page title, as a small + or - sign. If you click on the + sign, you will add that page to your preferred set of shortcuts. If the page is already part of your shortcut set, the link will be a - sign, and will allow you to remove the current page from your shortcut set.') . '</dd>';
      $output .= '<dt>' . t('Displaying shortcuts') . '</dt>';
      $output .= '<dd>' . t('You can display your shortcuts by enabling the Shortcuts block on the <a href="@blocks">Blocks administration page</a>. Certain administrative modules also display your shortcuts; for example, the core <a href="@toolbar-help">Toolbar module</a> displays them near the top of the page, along with an <em>Edit shortcuts</em> link.', array('@blocks' => url('admin/structure/block'), '@toolbar-help' => url('admin/help/toolbar'))) . '</dd>';
      $output .= '</dl>';
      return $output;

    case 'admin/config/user-interface/shortcut':
    case 'admin/config/user-interface/shortcut/%':
      if (user_access('switch shortcut sets')) {
        $output = '<p>' . t('Define which shortcut set you are using on the <a href="@shortcut-link">Shortcuts tab</a> of your account page.', array('@shortcut-link' => url("user/{$user->uid}/shortcuts"))) . '</p>';
        return $output;
      }
  }
}

/**
 * Implements hook_permission().
 */
function shortcut_permission() {
  return array(
    'administer shortcuts' => array(
      'title' => t('Administer shortcuts'),
    ),
    'customize shortcut links' => array(
      'title' => t('Edit current shortcut set'),
      'description' => t('Editing the current shortcut set will affect other users if that set has been assigned to or selected by other users. Granting "Select any shortcut set" permission along with this permission will grant permission to edit any shortcut set.'),
    ),
    'switch shortcut sets' => array(
      'title' => t('Select any shortcut set'),
      'description' => t('From all shortcut sets, select one to be own active set. Without this permission, an administrator selects shortcut sets for users.'),
    ),
  );
}

/**
 * Implements hook_menu().
 */
function shortcut_menu() {
  $items['admin/config/user-interface/shortcut'] = array(
    'title' => 'Shortcuts',
    'description' => 'Add and modify shortcut sets.',
    'page callback' => 'shortcut_set_admin',
    'access arguments' => array('administer shortcuts'),
    'file' => 'shortcut.admin.inc',
  );
  $items['admin/config/user-interface/shortcut/add-set'] = array(
    'title' => 'Add shortcut set',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_set_add_form'),
    'access arguments' => array('administer shortcuts'),
    'type' => MENU_LOCAL_ACTION,
    'file' => 'shortcut.admin.inc',
  );
  $items['admin/config/user-interface/shortcut/%shortcut_set'] = array(
    'title' => 'Edit shortcuts',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_set_customize', 4),
    'title callback' => 'shortcut_set_title',
    'title arguments' => array(4),
    'access callback' => 'shortcut_set_edit_access',
    'access arguments' => array(4),
    'file' => 'shortcut.admin.inc',
  );
  $items['admin/config/user-interface/shortcut/%shortcut_set/links'] = array(
    'title' => 'List links',
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
  $items['admin/config/user-interface/shortcut/%shortcut_set/edit'] = array(
    'title' => 'Edit set name',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_set_edit_form', 4),
    'access callback' => 'shortcut_set_edit_access',
    'access arguments' => array(4),
    'type' => MENU_LOCAL_TASK,
    'file' => 'shortcut.admin.inc',
    'weight' => 10,
  );
  $items['admin/config/user-interface/shortcut/%shortcut_set/delete'] = array(
    'title' => 'Delete shortcut set',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_set_delete_form', 4),
    'access callback' => 'shortcut_set_delete_access',
    'access arguments' => array(4),
    'file' => 'shortcut.admin.inc',
  );
  $items['admin/config/user-interface/shortcut/%shortcut_set/add-link'] = array(
    'title' => 'Add shortcut',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_link_add', 4),
    'access callback' => 'shortcut_set_edit_access',
    'access arguments' => array(4),
    'type' => MENU_LOCAL_ACTION,
    'file' => 'shortcut.admin.inc',
  );
  $items['admin/config/user-interface/shortcut/%shortcut_set/add-link-inline'] = array(
    'title' => 'Add shortcut',
    'page callback' => 'shortcut_link_add_inline',
    'page arguments' => array(4),
    'access callback' => 'shortcut_set_edit_access',
    'access arguments' => array(4),
    'type' => MENU_CALLBACK,
    'file' => 'shortcut.admin.inc',
  );
  $items['admin/config/user-interface/shortcut/link/%menu_link'] = array(
    'title' => 'Edit shortcut',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_link_edit', 5),
    'access callback' => 'shortcut_link_access',
    'access arguments' => array(5),
    'file' => 'shortcut.admin.inc',
  );
  $items['admin/config/user-interface/shortcut/link/%menu_link/delete'] = array(
    'title' => 'Delete shortcut',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_link_delete', 5),
    'access callback' => 'shortcut_link_access',
    'access arguments' => array(5),
    'file' => 'shortcut.admin.inc',
  );
  $items['user/%user/shortcuts'] = array(
    'title' => 'Shortcuts',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('shortcut_set_switch', 1),
    'access callback' => 'shortcut_set_switch_access',
    'access arguments' => array(1),
    'type' => MENU_LOCAL_TASK,
    'file' => 'shortcut.admin.inc',
  );

  return $items;
}

/**
 * Implements hook_admin_paths().
 */
function shortcut_admin_paths() {
  $paths = array(
    'user/*/shortcuts' => TRUE,
  );
  return $paths;
}

/**
 * Implements hook_theme().
 */
function shortcut_theme() {
  return array(
    'shortcut_set_customize' => array(
      'render element' => 'form',
      'file' => 'shortcut.admin.inc',
    ),
  );
}

/**
 * Implements hook_block_info().
 */
function shortcut_block_info() {
  $blocks['shortcuts']['info'] = t('Shortcuts');
  // Shortcut blocks can't be cached because each menu item can have a custom
  // access callback. menu.inc manages its own caching.
  $blocks['shortcuts']['cache'] = DRUPAL_NO_CACHE;
  return $blocks;
}

/**
 * Implements hook_block_view().
 */
function shortcut_block_view($delta = '') {
  if ($delta == 'shortcuts') {
    $shortcut_set = shortcut_current_displayed_set();
    $data['subject'] = t('@shortcut_set shortcuts', array('@shortcut_set' => $shortcut_set->title));
    $data['content'] = shortcut_renderable_links($shortcut_set);
    return $data;
  }
}

/**
 * Access callback for editing a shortcut set.
 *
 * @param object $shortcut_set
 *   (optional) The shortcut set to be edited. If not set, the current user's
 *   shortcut set will be used.
 *
 * @return
 *   TRUE if the current user has access to edit the shortcut set, FALSE
 *   otherwise.
 */
function shortcut_set_edit_access($shortcut_set = NULL) {
  // Sufficiently-privileged users can edit their currently displayed shortcut
  // set, but not other sets. Shortcut administrators can edit any set.
  if (user_access('administer shortcuts')) {
    return TRUE;
  }
  if (user_access('customize shortcut links')) {
    return !isset($shortcut_set) || $shortcut_set == shortcut_current_displayed_set();
  }
  return FALSE;
}

/**
 * Access callback for deleting a shortcut set.
 *
 * @param $shortcut_set
 *   The shortcut set to be deleted.
 *
 * @return
 *   TRUE if the current user has access to delete shortcut sets and this is
 *   not the site-wide default set; FALSE otherwise.
 */
function shortcut_set_delete_access($shortcut_set) {
  // Only admins can delete sets.
  if (!user_access('administer shortcuts')) {
    return FALSE;
  }

  // Never let the default shortcut set be deleted.
  if ($shortcut_set->set_name == SHORTCUT_DEFAULT_SET_NAME) {
    return FALSE;
  }

  return TRUE;
}

/**
 * Access callback for switching the shortcut set assigned to a user account.
 *
 * @param object $account
 *   (optional) The user account whose shortcuts will be switched. If not set,
 *   permissions will be checked for switching the logged-in user's own
 *   shortcut set.
 *
 * @return
 *   TRUE if the current user has access to switch the shortcut set of the
 *   provided account, FALSE otherwise.
 */
function shortcut_set_switch_access($account = NULL) {
  global $user;

  if (user_access('administer shortcuts')) {
    // Administrators can switch anyone's shortcut set.
    return TRUE;
  }

  if (!user_access('switch shortcut sets')) {
    // The user has no permission to switch anyone's shortcut set.
    return FALSE;
  }

  if (!isset($account) || $user->uid == $account->uid) {
    // Users with the 'switch shortcut sets' permission can switch their own
    // shortcuts sets.
    return TRUE;
  }

  return FALSE;
}

/**
 * Access callback for editing a link in a shortcut set.
 */
function shortcut_link_access($menu_link) {
  // The link must belong to a shortcut set that the current user has access
  // to edit.
  if ($shortcut_set = shortcut_set_load($menu_link['menu_name'])) {
    return shortcut_set_edit_access($shortcut_set);
  }
  return FALSE;
}

/**
 * Loads the data for a shortcut set.
 *
 * @param $set_name
 *   The name of the shortcut set to load.
 *
 * @return object
 *   If the shortcut set exists, an object containing the following properties:
 *   - 'set_name': The internal name of the shortcut set.
 *   - 'title': The title of the shortcut set.
 *   - 'links': An array of links associated with this shortcut set.
 *   If the shortcut set does not exist, the function returns FALSE.
 */
function shortcut_set_load($set_name) {
  $set = db_select('shortcut_set', 'ss')
  ->fields('ss')
  ->condition('set_name', $set_name)
  ->execute()
  ->fetchObject();
  if (!$set) {
    return FALSE;
  }
  $set->links = menu_load_links($set_name);
  return $set;
}

/**
 * Saves a shortcut set.
 *
 * @param $shortcut_set
 *   An object containing the following properties:
 *   - 'title': The title of the shortcut set.
 *   - 'set_name': (optional) The internal name of the shortcut set. If
 *     omitted, a new shortcut set will be created, and the 'set_name' property
 *     will be added to the passed-in object.
 *   - 'links': (optional) An array of menu links to save for the shortcut set.
 *     Each link is an array containing at least the following keys (which will
 *     be expanded to fill in other default values after the shortcut set is
 *     saved):
 *     - 'link_path': The Drupal path or external path that the link points to.
 *     - 'link_title': The title of the link.
 *     Any other keys accepted by menu_link_save() may also be provided.
 *
 * @return
 *   A constant which is either SAVED_NEW or SAVED_UPDATED depending on whether
 *   a new set was created or an existing one was updated.
 *
 * @see menu_link_save()
 */
function shortcut_set_save(&$shortcut_set) {
  // First save the shortcut set itself.
  if (isset($shortcut_set->set_name)) {
    $return = drupal_write_record('shortcut_set', $shortcut_set, 'set_name');
  }
  else {
    $shortcut_set->set_name = shortcut_set_get_unique_name();
    $return = drupal_write_record('shortcut_set', $shortcut_set);
  }
  // If links were provided for the set, save them.
  if (isset($shortcut_set->links)) {
    foreach ($shortcut_set->links as &$link) {
      // Do not specifically associate these links with the shortcut module,
      // since other modules may make them editable via the menu system.
      // However, we do need to specify the correct menu name.
      $link['menu_name'] = $shortcut_set->set_name;
      $link['plid'] = 0;
      menu_link_save($link);
    }
    // Make sure that we have a return value, since if the links were updated
    // but the shortcut set was not, the call to drupal_write_record() above
    // would not return an indication that anything had changed.
    if (empty($return)) {
      $return = SAVED_UPDATED;
    }
  }
  return $return;
}

/**
 * Deletes a shortcut set.
 *
 * Note that the default set cannot be deleted.
 *
 * @param $shortcut_set
 *   An object representing the shortcut set to delete.
 *
 * @return
 *   TRUE if the set was deleted, FALSE otherwise.
 */
function shortcut_set_delete($shortcut_set) {
  // Don't allow deletion of the system default shortcut set.
  if ($shortcut_set->set_name == SHORTCUT_DEFAULT_SET_NAME) {
    return FALSE;
  }

  // First, delete any user assignments for this set, so that each of these
  // users will go back to using whatever default set applies.
  db_delete('shortcut_set_users')
    ->condition('set_name', $shortcut_set->set_name)
    ->execute();

  // Next, delete the menu links for this set.
  menu_delete_links($shortcut_set->set_name);

  // Finally, delete the set itself.
  $deleted = db_delete('shortcut_set')
    ->condition('set_name', $shortcut_set->set_name)
    ->execute();

  return (bool) $deleted;
}

/**
 * Resets the link weights in a shortcut set to match their current order.
 *
 * This function can be used, for example, when a new shortcut link is added to
 * the set. If the link is added to the end of the array and this function is
 * called, it will force that link to display at the end of the list.
 *
 * @param object $shortcut_set
 *   An object representing a shortcut set. The link weights of the passed-in
 *   object will be reset as described above.
 */
function shortcut_set_reset_link_weights(&$shortcut_set) {
  $weight = -50;
  foreach ($shortcut_set->links as &$link) {
    $link['weight'] = $weight;
    $weight++;
  }
}

/**
 * Assigns a user to a particular shortcut set.
 *
 * @param $shortcut_set
 *   An object representing the shortcut set.
 * @param $account
 *   A user account that will be assigned to use the set.
 */
function shortcut_set_assign_user($shortcut_set, $account) {
  db_merge('shortcut_set_users')
    ->key(array('uid' => $account->uid))
    ->fields(array('set_name' => $shortcut_set->set_name))
    ->execute();
  drupal_static_reset('shortcut_current_displayed_set');
}

/**
 * Unassigns a user from any shortcut set they may have been assigned to.
 *
 * The user will go back to using whatever default set applies.
 *
 * @param $account
 *   A user account that will be removed from the shortcut set assignment.
 *
 * @return
 *   TRUE if the user was previously assigned to a shortcut set and has been
 *   successfully removed from it. FALSE if the user was already not assigned
 *   to any set.
 */
function shortcut_set_unassign_user($account) {
  $deleted = db_delete('shortcut_set')
    ->condition('uid', $account->uid)
    ->execute();
  return (bool) $deleted;
}

/**
 * Returns the current displayed shortcut set for the provided user account.
 *
 * @param $account
 *   (optional) The user account whose shortcuts will be returned. Defaults to
 *   the currently logged-in user.
 *
 * @return
 *   An object representing the shortcut set that should be displayed to the
 *   current user. If the user does not have an explicit shortcut set defined,
 *   the default set is returned.
 */
function shortcut_current_displayed_set($account = NULL) {
  $shortcut_sets = &drupal_static(__FUNCTION__, array());
  global $user;
  if (!isset($account)) {
    $account = $user;
  }
  // Try to return a shortcut set from the static cache.
  if (isset($shortcut_sets[$account->uid])) {
    return $shortcut_sets[$account->uid];
  }
  // If none was found, try to find a shortcut set that is explicitly assigned
  // to this user.
  $query = db_select('shortcut_set', 's');
  $query->addField('s', 'set_name');
  $query->join('shortcut_set_users', 'u', 's.set_name = u.set_name');
  $query->condition('u.uid', $account->uid);
  $shortcut_set_name = $query->execute()->fetchField();
  if ($shortcut_set_name) {
    $shortcut_set = shortcut_set_load($shortcut_set_name);
  }
  // Otherwise, use the default set.
  else {
    $shortcut_set = shortcut_default_set($account);
  }

  $shortcut_sets[$account->uid] = $shortcut_set;
  return $shortcut_set;
}

/**
 * Returns the default shortcut set for a given user account.
 *
 * @param object $account
 *   (optional) The user account whose default shortcut set will be returned.
 *   If not provided, the function will return the currently logged-in user's
 *   default shortcut set.
 *
 * @return
 *   An object representing the default shortcut set.
 */
function shortcut_default_set($account = NULL) {
  global $user;
  if (!isset($account)) {
    $account = $user;
  }

  // Allow modules to return a default shortcut set name. Since we can only
  // have one, we allow the last module which returns a valid result to take
  // precedence. If no module returns a valid set, fall back on the site-wide
  // default, which is the lowest-numbered shortcut set.
  $suggestions = array_reverse(module_invoke_all('shortcut_default_set', $account));
  $suggestions[] = SHORTCUT_DEFAULT_SET_NAME;
  foreach ($suggestions as $name) {
    if ($shortcut_set = shortcut_set_load($name)) {
      break;
    }
  }

  return $shortcut_set;
}

/**
 * Returns a unique, machine-readable shortcut set name.
 */
function shortcut_set_get_unique_name() {
  // Shortcut sets are numbered sequentially, so we keep trying until we find
  // one that is available. For better performance, we start with a number
  // equal to one more than the current number of shortcut sets, so that if
  // no shortcut sets have been deleted from the database, this will
  // automatically give us the correct one.
  $number = db_query("SELECT COUNT(*) FROM {shortcut_set}")->fetchField() + 1;
  do {
    $name = shortcut_set_name($number);
    $number++;
  } while ($shortcut_set = shortcut_set_load($name));
  return $name;
}

/**
 * Returns the name of a shortcut set, based on a provided number.
 *
 * All shortcut sets have names like "shortcut-set-N" so that they can be
 * matched with a properly-namespaced entry in the {menu_links} table.
 *
 * @param $number
 *   A number representing the shortcut set whose name should be retrieved.
 *
 * @return
 *   A string representing the expected shortcut name.
 */
function shortcut_set_name($number) {
  return "shortcut-set-$number";
}

/**
 * Returns an array of all shortcut sets, keyed by the set name.
 *
 * @return
 *   An array of shortcut sets. Note that only the basic shortcut set
 *   properties (name and title) are returned by this function, not the list
 *   of menu links that belong to the set.
 */
function shortcut_sets() {
  return db_select('shortcut_set', 'ss')
  ->fields('ss')
  ->execute()
  ->fetchAllAssoc('set_name');
}

/**
 * Check to see if a shortcut set with the given title already exists.
 *
 * @param $title
 *   Human-readable name of the shortcut set to check.
 *
 * @return
 *   TRUE if a shortcut set with that title exists; FALSE otherwise.
 */
function shortcut_set_title_exists($title) {
  return (bool) db_query_range('SELECT 1 FROM {shortcut_set} WHERE title = :title', 0, 1, array(':title' => $title))->fetchField();
}

/**
 * Determines if a path corresponds to a valid shortcut link.
 *
 * @param $path
 *   The path to the link.
 * @return
 *   TRUE if the shortcut link is valid, FALSE otherwise. Valid links are ones
 *   that correspond to actual paths on the site.
 *
 * @see menu_edit_item_validate()
 */
function shortcut_valid_link($path) {
  // Do not use URL aliases.
  $normal_path = drupal_get_normal_path($path);
  if ($path != $normal_path) {
    $path = $normal_path;
  }
  // Only accept links that correspond to valid paths on the site itself.
  return !url_is_external($path) && menu_get_item($path);
}

/**
 * Returns an array of shortcut links, suitable for rendering.
 *
 * @param $shortcut_set
 *   (optional) An object representing the set whose links will be displayed.
 *   If not provided, the user's current set will be displayed.
 * @return
 *   An array of shortcut links, in the format returned by the menu system.
 *
 * @see menu_tree()
 */
function shortcut_renderable_links($shortcut_set = NULL) {
  if (!isset($shortcut_set)) {
    $shortcut_set = shortcut_current_displayed_set();
  }
  return menu_tree($shortcut_set->set_name);
}

/**
 * Implements hook_preprocess_page().
 */
function shortcut_preprocess_page(&$variables) {
  if (shortcut_set_edit_access()) {
    $link = $_GET['q'];
    $query_parameters = drupal_get_query_parameters();
    if (!empty($query_parameters)) {
     $link .= '?' . drupal_http_build_query($query_parameters);
    }
    $query = array(
     'link' => $link,
     'name' => drupal_get_title(),
    );
    $query += drupal_get_destination();

    $shortcut_set = shortcut_current_displayed_set();

    // Check if $link is already a shortcut and set $link_mode accordingly.
    foreach ($shortcut_set->links as $shortcut) {
      if ($link == $shortcut['link_path']) {
        $mlid = $shortcut['mlid'];
        break;
      }
    }
    $link_mode = isset($mlid) ? "remove" : "add";

    if ($link_mode == "add") {
      $query['token'] = drupal_get_token('shortcut-add-link');
      $link_text = shortcut_set_switch_access() ? t('Add to %shortcut_set shortcuts', array('%shortcut_set' => $shortcut_set->title)) : t('Add to shortcuts');
      $link_path = 'admin/config/user-interface/shortcut/' . $shortcut_set->set_name . '/add-link-inline';
    }
    else {
      $query['mlid'] = $mlid;
      $link_text = shortcut_set_switch_access() ? t('Remove from %shortcut_set shortcuts', array('%shortcut_set' => $shortcut_set->title)) : t('Remove from shortcuts');
      $link_path = 'admin/config/user-interface/shortcut/link/' . $mlid . '/delete';
    }

    if (theme_get_setting('shortcut_module_link')) {
      $variables['title_suffix']['add_or_remove_shortcut'] = array(
        '#attached' => array('css' => array(drupal_get_path('module', 'shortcut') . '/shortcut.css')),
        '#prefix' => '<div class="add-or-remove-shortcuts ' . $link_mode . '-shortcut">',
        '#type' => 'link',
        '#title' => '<span class="icon"></span><span class="text">' . $link_text . '</span>',
        '#href' => $link_path,
        '#options' => array('query' => $query, 'html' => TRUE),
        '#suffix' => '</div>',
      );
    }
  }
}

/**
 * Implements hook_page_alter().
 */
function shortcut_page_alter(&$page) {
  if (isset($page['page_top']['toolbar'])) {
    // If the toolbar is available, add a pre-render function to display the
    // current shortcuts in the toolbar drawer.
    $page['page_top']['toolbar']['#pre_render'][] = 'shortcut_toolbar_pre_render';
  }
}

/**
 * Pre-render function for adding shortcuts to the toolbar drawer.
 */
function shortcut_toolbar_pre_render($toolbar) {
  $links = shortcut_renderable_links();
  $links['#attached'] = array('css' => array(drupal_get_path('module', 'shortcut') . '/shortcut.css'));
  $links['#prefix'] = '<div class="toolbar-shortcuts">';
  $links['#suffix'] = '</div>';
  $shortcut_set = shortcut_current_displayed_set();
  $configure_link = NULL;
  if (shortcut_set_edit_access($shortcut_set)) {
    $configure_link = array(
      '#type' => 'link',
      '#title' => t('Edit shortcuts'),
      '#href' => 'admin/config/user-interface/shortcut/' . $shortcut_set->set_name,
      '#options' => array('attributes' => array('id' => 'edit-shortcuts')),
    );
  }

  $drawer = array(
    'shortcuts' => $links,
    'configure' => $configure_link,
  );

  $toolbar['toolbar_drawer'][] = $drawer;
  return $toolbar;
}

/**
 * Returns the title of a shortcut set.
 *
 * Title callback for the editing pages for shortcut sets.
 *
 * @param $shortcut_set
 *   An object representing the shortcut set, as returned by
 *   shortcut_set_load().
 */
function shortcut_set_title($shortcut_set) {
  return check_plain($shortcut_set->title);
}