lib/command.php

   1 <?php
   2 /*
   3  * StatusNet - the distributed open-source microblogging tool
   4  * Copyright (C) 2008, 2009, 2010 StatusNet, Inc.
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Affero General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
  21
  22 require_once(INSTALLDIR.'/lib/channel.php');
  23
  24 class Command
  25 {
  26
  27     var $user = null;
  28
  29     function __construct($user=null)
  30     {
  31         $this->user = $user;
  32     }
  33
  34     /**
  35      * Execute the command and send success or error results
  36      * back via the given communications channel.
  37      *
  38      * @param Channel
  39      */
  40     public function execute($channel)
  41     {
  42         try {
  43             $this->handle($channel);
  44         } catch (CommandException $e) {
  45             $channel->error($this->user, $e->getMessage());
  46         } catch (Exception $e) {
  47             common_log(LOG_ERR, "Error handling " . get_class($this) . ": " . $e->getMessage());
  48             $channel->error($this->user, $e->getMessage());
  49         }
  50     }
  51
  52
  53     /**
  54      * Override this with the meat!
  55      *
  56      * An error to send back to the user may be sent by throwing
  57      * a CommandException with a formatted message.
  58      *
  59      * @param Channel
  60      * @throws CommandException
  61      */
  62     function handle($channel)
  63     {
  64         return false;
  65     }
  66
  67     /**
  68      * Look up a notice from an argument, by poster's name to get last post
  69      * or notice_id prefixed with #.
  70      *
  71      * @return Notice
  72      * @throws CommandException
  73      */
  74     function getNotice($arg)
  75     {
  76         $notice = null;
  77         if (Event::handle('StartCommandGetNotice', array($this, $arg, &$notice))) {
  78             if(substr($this->other,0,1)=='#'){
  79                 // A specific notice_id #123
  80
  81                 $notice = Notice::staticGet(substr($arg,1));
  82                 if (!$notice) {
  83                     throw new CommandException(_('Notice with that id does not exist'));
  84                 }
  85             }
  86
  87             if (Validate::uri($this->other)) {
  88                 // A specific notice by URI lookup
  89                 $notice = Notice::staticGet('uri', $arg);
  90             }
  91
  92             if (!$notice) {
  93                 // Local or remote profile name to get their last notice.
  94                 // May throw an exception and report 'no such user'
  95                 $recipient = $this->getProfile($arg);
  96
  97                 $notice = $recipient->getCurrentNotice();
  98                 if (!$notice) {
  99                     throw new CommandException(_('User has no last notice'));
 100                 }
 101             }
 102         }
 103         Event::handle('EndCommandGetNotice', array($this, $arg, &$notice));
 104         if (!$notice) {
 105             throw new CommandException(_('Notice with that id does not exist'));
 106         }
 107         return $notice;
 108     }
 109
 110     /**
 111      * Look up a local or remote profile by nickname.
 112      *
 113      * @return Profile
 114      * @throws CommandException
 115      */
 116     function getProfile($arg)
 117     {
 118         $profile = null;
 119         if (Event::handle('StartCommandGetProfile', array($this, $arg, &$profile))) {
 120             $profile =
 121               common_relative_profile($this->user, common_canonical_nickname($arg));
 122         }
 123         Event::handle('EndCommandGetProfile', array($this, $arg, &$profile));
 124         if (!$profile) {
 125             throw new CommandException(sprintf(_('Could not find a user with nickname %s'), $arg));
 126         }
 127         return $profile;
 128     }
 129
 130     /**
 131      * Get a local user by name
 132      * @return User
 133      * @throws CommandException
 134      */
 135     function getUser($arg)
 136     {
 137         $user = null;
 138         if (Event::handle('StartCommandGetUser', array($this, $arg, &$user))) {
 139             $user = User::staticGet('nickname', $arg);
 140         }
 141         Event::handle('EndCommandGetUser', array($this, $arg, &$user));
 142         if (!$user){
 143             throw new CommandException(sprintf(_('Could not find a local user with nickname %s'),
 144                                $arg));
 145         }
 146         return $user;
 147     }
 148
 149     /**
 150      * Get a local or remote group by name.
 151      * @return User_group
 152      * @throws CommandException
 153      */
 154     function getGroup($arg)
 155     {
 156         $group = null;
 157         if (Event::handle('StartCommandGetGroup', array($this, $arg, &$group))) {
 158             $group = User_group::getForNickname($arg, $this->user->getProfile());
 159         }
 160         Event::handle('EndCommandGetGroup', array($this, $arg, &$group));
 161         if (!$group) {
 162             throw new CommandException(_('No such group.'));
 163         }
 164         return $group;
 165     }
 166 }
 167
 168 class CommandException extends Exception
 169 {
 170 }
 171
 172 class UnimplementedCommand extends Command
 173 {
 174     function handle($channel)
 175     {
 176         $channel->error($this->user, _("Sorry, this command is not yet implemented."));
 177     }
 178 }
 179
 180 class TrackingCommand extends UnimplementedCommand
 181 {
 182 }
 183
 184 class TrackOffCommand extends UnimplementedCommand
 185 {
 186 }
 187
 188 class TrackCommand extends UnimplementedCommand
 189 {
 190     var $word = null;
 191     function __construct($user, $word)
 192     {
 193         parent::__construct($user);
 194         $this->word = $word;
 195     }
 196 }
 197
 198 class UntrackCommand extends UnimplementedCommand
 199 {
 200     var $word = null;
 201     function __construct($user, $word)
 202     {
 203         parent::__construct($user);
 204         $this->word = $word;
 205     }
 206 }
 207
 208 class NudgeCommand extends Command
 209 {
 210     var $other = null;
 211     function __construct($user, $other)
 212     {
 213         parent::__construct($user);
 214         $this->other = $other;
 215     }
 216
 217     function handle($channel)
 218     {
 219         $recipient = $this->getUser($this->other);
 220         if ($recipient->id == $this->user->id) {
 221             throw new CommandException(_('It does not make a lot of sense to nudge yourself!'));
 222         } else {
 223             if ($recipient->email && $recipient->emailnotifynudge) {
 224                 mail_notify_nudge($this->user, $recipient);
 225             }
 226             // XXX: notify by IM
 227             // XXX: notify by SMS
 228             $channel->output($this->user, sprintf(_('Nudge sent to %s'),
 229                            $recipient->nickname));
 230         }
 231     }
 232 }
 233
 234 class InviteCommand extends UnimplementedCommand
 235 {
 236     var $other = null;
 237     function __construct($user, $other)
 238     {
 239         parent::__construct($user);
 240         $this->other = $other;
 241     }
 242 }
 243
 244 class StatsCommand extends Command
 245 {
 246     function handle($channel)
 247     {
 248         $profile = $this->user->getProfile();
 249
 250         $subs_count   = $profile->subscriptionCount();
 251         $subbed_count = $profile->subscriberCount();
 252         $notice_count = $profile->noticeCount();
 253
 254         $channel->output($this->user, sprintf(_("Subscriptions: %1\$s\n".
 255                                    "Subscribers: %2\$s\n".
 256                                    "Notices: %3\$s"),
 257                                  $subs_count,
 258                                  $subbed_count,
 259                                  $notice_count));
 260     }
 261 }
 262
 263 class FavCommand extends Command
 264 {
 265     var $other = null;
 266
 267     function __construct($user, $other)
 268     {
 269         parent::__construct($user);
 270         $this->other = $other;
 271     }
 272
 273     function handle($channel)
 274     {
 275         $notice = $this->getNotice($this->other);
 276         $fave = Fave::addNew($this->user, $notice);
 277
 278         if (!$fave) {
 279             $channel->error($this->user, _('Could not create favorite.'));
 280             return;
 281         }
 282
 283         // @fixme favorite notification should be triggered
 284         // at a lower level
 285
 286         $other = User::staticGet('id', $notice->profile_id);
 287
 288         if ($other && $other->id != $user->id) {
 289             if ($other->email && $other->emailnotifyfav) {
 290                 mail_notify_fave($other, $this->user, $notice);
 291             }
 292         }
 293
 294         $this->user->blowFavesCache();
 295
 296         $channel->output($this->user, _('Notice marked as fave.'));
 297     }
 298
 299 }
 300
 301 class JoinCommand extends Command
 302 {
 303     var $other = null;
 304
 305     function __construct($user, $other)
 306     {
 307         parent::__construct($user);
 308         $this->other = $other;
 309     }
 310
 311     function handle($channel)
 312     {
 313         $group = $this->getGroup($this->other);
 314         $cur   = $this->user;
 315
 316         if ($cur->isMember($group)) {
 317             $channel->error($cur, _('You are already a member of that group'));
 318             return;
 319         }
 320         if (Group_block::isBlocked($group, $cur->getProfile())) {
 321           $channel->error($cur, _('You have been blocked from that group by the admin.'));
 322             return;
 323         }
 324
 325         try {
 326             if (Event::handle('StartJoinGroup', array($group, $cur))) {
 327                 Group_member::join($group->id, $cur->id);
 328                 Event::handle('EndJoinGroup', array($group, $cur));
 329             }
 330         } catch (Exception $e) {
 331             $channel->error($cur, sprintf(_('Could not join user %s to group %s'),
 332                                           $cur->nickname, $group->nickname));
 333             return;
 334         }
 335
 336         $channel->output($cur, sprintf(_('%s joined group %s'),
 337                                               $cur->nickname,
 338                                               $group->nickname));
 339     }
 340
 341 }
 342 class DropCommand extends Command
 343 {
 344     var $other = null;
 345
 346     function __construct($user, $other)
 347     {
 348         parent::__construct($user);
 349         $this->other = $other;
 350     }
 351
 352     function handle($channel)
 353     {
 354         $group = $this->getGroup($this->other);
 355         $cur   = $this->user;
 356
 357         if (!$group) {
 358             $channel->error($cur, _('No such group.'));
 359             return;
 360         }
 361
 362         if (!$cur->isMember($group)) {
 363             $channel->error($cur, _('You are not a member of that group.'));
 364             return;
 365         }
 366
 367         try {
 368             if (Event::handle('StartLeaveGroup', array($group, $cur))) {
 369                 Group_member::leave($group->id, $cur->id);
 370                 Event::handle('EndLeaveGroup', array($group, $cur));
 371             }
 372         } catch (Exception $e) {
 373             $channel->error($cur, sprintf(_('Could not remove user %s to group %s'),
 374                                           $cur->nickname, $group->nickname));
 375             return;
 376         }
 377
 378         $channel->output($cur, sprintf(_('%s left group %s'),
 379                                               $cur->nickname,
 380                                               $group->nickname));
 381     }
 382
 383 }
 384
 385 class WhoisCommand extends Command
 386 {
 387     var $other = null;
 388     function __construct($user, $other)
 389     {
 390         parent::__construct($user);
 391         $this->other = $other;
 392     }
 393
 394     function handle($channel)
 395     {
 396         $recipient = $this->getProfile($this->other);
 397
 398         $whois = sprintf(_("%1\$s (%2\$s)"), $recipient->nickname,
 399                          $recipient->profileurl);
 400         if ($recipient->fullname) {
 401             $whois .= "\n" . sprintf(_('Fullname: %s'), $recipient->fullname);
 402         }
 403         if ($recipient->location) {
 404             $whois .= "\n" . sprintf(_('Location: %s'), $recipient->location);
 405         }
 406         if ($recipient->homepage) {
 407             $whois .= "\n" . sprintf(_('Homepage: %s'), $recipient->homepage);
 408         }
 409         if ($recipient->bio) {
 410             $whois .= "\n" . sprintf(_('About: %s'), $recipient->bio);
 411         }
 412         $channel->output($this->user, $whois);
 413     }
 414 }
 415
 416 class MessageCommand extends Command
 417 {
 418     var $other = null;
 419     var $text = null;
 420     function __construct($user, $other, $text)
 421     {
 422         parent::__construct($user);
 423         $this->other = $other;
 424         $this->text = $text;
 425     }
 426
 427     function handle($channel)
 428     {
 429         try {
 430             $other = $this->getUser($this->other);
 431         } catch (CommandException $e) {
 432             try {
 433                 $profile = $this->getProfile($this->other);
 434             } catch (CommandException $f) {
 435                 throw $e;
 436             }
 437             throw new CommandException(sprintf(_('%s is a remote profile; you can only send direct messages to users on the same server.'), $this->other));
 438         }
 439
 440         $len = mb_strlen($this->text);
 441
 442         if ($len == 0) {
 443             $channel->error($this->user, _('No content!'));
 444             return;
 445         }
 446
 447         $this->text = common_shorten_links($this->text);
 448
 449         if (Message::contentTooLong($this->text)) {
 450             $channel->error($this->user, sprintf(_('Message too long - maximum is %d characters, you sent %d'),
 451                                                  Message::maxContent(), mb_strlen($this->text)));
 452             return;
 453         }
 454
 455         if (!$other) {
 456             $channel->error($this->user, _('No such user.'));
 457             return;
 458         } else if (!$this->user->mutuallySubscribed($other)) {
 459             $channel->error($this->user, _('You can\'t send a message to this user.'));
 460             return;
 461         } else if ($this->user->id == $other->id) {
 462             $channel->error($this->user, _('Don\'t send a message to yourself; just say it to yourself quietly instead.'));
 463             return;
 464         }
 465         $message = Message::saveNew($this->user->id, $other->id, $this->text, $channel->source());
 466         if ($message) {
 467             $message->notify();
 468             $channel->output($this->user, sprintf(_('Direct message to %s sent'), $this->other));
 469         } else {
 470             $channel->error($this->user, _('Error sending direct message.'));
 471         }
 472     }
 473 }
 474
 475 class RepeatCommand extends Command
 476 {
 477     var $other = null;
 478     function __construct($user, $other)
 479     {
 480         parent::__construct($user);
 481         $this->other = $other;
 482     }
 483
 484     function handle($channel)
 485     {
 486         $notice = $this->getNotice($this->other);
 487
 488         if($this->user->id == $notice->profile_id)
 489         {
 490             $channel->error($this->user, _('Cannot repeat your own notice'));
 491             return;
 492         }
 493
 494         if ($this->user->getProfile()->hasRepeated($notice->id)) {
 495             $channel->error($this->user, _('Already repeated that notice'));
 496             return;
 497         }
 498
 499         $repeat = $notice->repeat($this->user->id, $channel->source);
 500
 501         if ($repeat) {
 502
 503             $channel->output($this->user, sprintf(_('Notice from %s repeated'), $recipient->nickname));
 504         } else {
 505             $channel->error($this->user, _('Error repeating notice.'));
 506         }
 507     }
 508 }
 509
 510 class ReplyCommand extends Command
 511 {
 512     var $other = null;
 513     var $text = null;
 514     function __construct($user, $other, $text)
 515     {
 516         parent::__construct($user);
 517         $this->other = $other;
 518         $this->text = $text;
 519     }
 520
 521     function handle($channel)
 522     {
 523         $notice = $this->getNotice($this->other);
 524         $recipient = $notice->getProfile();
 525
 526         $len = mb_strlen($this->text);
 527
 528         if ($len == 0) {
 529             $channel->error($this->user, _('No content!'));
 530             return;
 531         }
 532
 533         $this->text = common_shorten_links($this->text);
 534
 535         if (Notice::contentTooLong($this->text)) {
 536             $channel->error($this->user, sprintf(_('Notice too long - maximum is %d characters, you sent %d'),
 537                                                  Notice::maxContent(), mb_strlen($this->text)));
 538             return;
 539         }
 540
 541         $notice = Notice::saveNew($this->user->id, $this->text, $channel->source(),
 542                                   array('reply_to' => $notice->id));
 543
 544         if ($notice) {
 545             $channel->output($this->user, sprintf(_('Reply to %s sent'), $recipient->nickname));
 546         } else {
 547             $channel->error($this->user, _('Error saving notice.'));
 548         }
 549
 550     }
 551 }
 552
 553 class GetCommand extends Command
 554 {
 555
 556     var $other = null;
 557
 558     function __construct($user, $other)
 559     {
 560         parent::__construct($user);
 561         $this->other = $other;
 562     }
 563
 564     function handle($channel)
 565     {
 566         $target = $this->getProfile($this->other);
 567
 568         $notice = $target->getCurrentNotice();
 569         if (!$notice) {
 570             $channel->error($this->user, _('User has no last notice'));
 571             return;
 572         }
 573         $notice_content = $notice->content;
 574
 575         $channel->output($this->user, $target->nickname . ": " . $notice_content);
 576     }
 577 }
 578
 579 class SubCommand extends Command
 580 {
 581
 582     var $other = null;
 583
 584     function __construct($user, $other)
 585     {
 586         parent::__construct($user);
 587         $this->other = $other;
 588     }
 589
 590     function handle($channel)
 591     {
 592
 593         if (!$this->other) {
 594             $channel->error($this->user, _('Specify the name of the user to subscribe to'));
 595             return;
 596         }
 597
 598         $target = $this->getProfile($this->other);
 599
 600         $remote = Remote_profile::staticGet('id', $target->id);
 601         if ($remote) {
 602             throw new CommandException(_("Can't subscribe to OMB profiles by command."));
 603         }
 604
 605         try {
 606             Subscription::start($this->user->getProfile(),
 607                                 $target);
 608             $channel->output($this->user, sprintf(_('Subscribed to %s'), $this->other));
 609         } catch (Exception $e) {
 610             $channel->error($this->user, $e->getMessage());
 611         }
 612     }
 613 }
 614
 615 class UnsubCommand extends Command
 616 {
 617
 618     var $other = null;
 619
 620     function __construct($user, $other)
 621     {
 622         parent::__construct($user);
 623         $this->other = $other;
 624     }
 625
 626     function handle($channel)
 627     {
 628         if(!$this->other) {
 629             $channel->error($this->user, _('Specify the name of the user to unsubscribe from'));
 630             return;
 631         }
 632
 633         $target = $this->getProfile($this->other);
 634
 635         try {
 636             Subscription::cancel($this->user->getProfile(),
 637                                  $target);
 638             $channel->output($this->user, sprintf(_('Unsubscribed from %s'), $this->other));
 639         } catch (Exception $e) {
 640             $channel->error($this->user, $e->getMessage());
 641         }
 642     }
 643 }
 644
 645 class OffCommand extends Command
 646 {
 647     var $other = null;
 648     function __construct($user, $other=null)
 649     {
 650         parent::__construct($user);
 651         $this->other = $other;
 652     }
 653     function handle($channel)
 654     {
 655         if ($other) {
 656             $channel->error($this->user, _("Command not yet implemented."));
 657         } else {
 658             if ($channel->off($this->user)) {
 659                 $channel->output($this->user, _('Notification off.'));
 660             } else {
 661                 $channel->error($this->user, _('Can\'t turn off notification.'));
 662             }
 663         }
 664     }
 665 }
 666
 667 class OnCommand extends Command
 668 {
 669     var $other = null;
 670     function __construct($user, $other=null)
 671     {
 672         parent::__construct($user);
 673         $this->other = $other;
 674     }
 675
 676     function handle($channel)
 677     {
 678         if ($other) {
 679             $channel->error($this->user, _("Command not yet implemented."));
 680         } else {
 681             if ($channel->on($this->user)) {
 682                 $channel->output($this->user, _('Notification on.'));
 683             } else {
 684                 $channel->error($this->user, _('Can\'t turn on notification.'));
 685             }
 686         }
 687     }
 688 }
 689
 690 class LoginCommand extends Command
 691 {
 692     function handle($channel)
 693     {
 694         $disabled = common_config('logincommand','disabled');
 695         $disabled = isset($disabled) && $disabled;
 696         if($disabled) {
 697             $channel->error($this->user, _('Login command is disabled'));
 698             return;
 699         }
 700
 701         try {
 702             $login_token = Login_token::makeNew($this->user);
 703         } catch (Exception $e) {
 704             $channel->error($this->user, $e->getMessage());
 705         }
 706
 707         $channel->output($this->user,
 708             sprintf(_('This link is useable only once, and is good for only 2 minutes: %s'),
 709                     common_local_url('otp',
 710                         array('user_id' => $login_token->user_id, 'token' => $login_token->token))));
 711     }
 712 }
 713
 714 class LoseCommand extends Command
 715 {
 716
 717     var $other = null;
 718
 719     function __construct($user, $other)
 720     {
 721         parent::__construct($user);
 722         $this->other = $other;
 723     }
 724
 725     function execute($channel)
 726     {
 727         if(!$this->other) {
 728             $channel->error($this->user, _('Specify the name of the user to unsubscribe from'));
 729             return;
 730         }
 731
 732         $result=subs_unsubscribe_from($this->user, $this->other);
 733
 734         if ($result) {
 735             $channel->output($this->user, sprintf(_('Unsubscribed  %s'), $this->other));
 736         } else {
 737             $channel->error($this->user, $result);
 738         }
 739     }
 740 }
 741
 742 class SubscriptionsCommand extends Command
 743 {
 744     function handle($channel)
 745     {
 746         $profile = $this->user->getSubscriptions(0);
 747         $nicknames=array();
 748         while ($profile->fetch()) {
 749             $nicknames[]=$profile->nickname;
 750         }
 751         if(count($nicknames)==0){
 752             $out=_('You are not subscribed to anyone.');
 753         }else{
 754             $out = ngettext('You are subscribed to this person:',
 755                 'You are subscribed to these people:',
 756                 count($nicknames));
 757             $out .= ' ';
 758             $out .= implode(', ',$nicknames);
 759         }
 760         $channel->output($this->user,$out);
 761     }
 762 }
 763
 764 class SubscribersCommand extends Command
 765 {
 766     function handle($channel)
 767     {
 768         $profile = $this->user->getSubscribers();
 769         $nicknames=array();
 770         while ($profile->fetch()) {
 771             $nicknames[]=$profile->nickname;
 772         }
 773         if(count($nicknames)==0){
 774             $out=_('No one is subscribed to you.');
 775         }else{
 776             $out = ngettext('This person is subscribed to you:',
 777                 'These people are subscribed to you:',
 778                 count($nicknames));
 779             $out .= ' ';
 780             $out .= implode(', ',$nicknames);
 781         }
 782         $channel->output($this->user,$out);
 783     }
 784 }
 785
 786 class GroupsCommand extends Command
 787 {
 788     function handle($channel)
 789     {
 790         $group = $this->user->getGroups();
 791         $groups=array();
 792         while ($group->fetch()) {
 793             $groups[]=$group->nickname;
 794         }
 795         if(count($groups)==0){
 796             $out=_('You are not a member of any groups.');
 797         }else{
 798             $out = ngettext('You are a member of this group:',
 799                 'You are a member of these groups:',
 800                 count($nicknames));
 801             $out.=implode(', ',$groups);
 802         }
 803         $channel->output($this->user,$out);
 804     }
 805 }
 806
 807 class HelpCommand extends Command
 808 {
 809     function handle($channel)
 810     {
 811         $channel->output($this->user,
 812                          _("Commands:\n".
 813                            "on - turn on notifications\n".
 814                            "off - turn off notifications\n".
 815                            "help - show this help\n".
 816                            "follow <nickname> - subscribe to user\n".
 817                            "groups - lists the groups you have joined\n".
 818                            "subscriptions - list the people you follow\n".
 819                            "subscribers - list the people that follow you\n".
 820                            "leave <nickname> - unsubscribe from user\n".
 821                            "d <nickname> <text> - direct message to user\n".
 822                            "get <nickname> - get last notice from user\n".
 823                            "whois <nickname> - get profile info on user\n".
 824                            "lose <nickname> - force user to stop following you\n".
 825                            "fav <nickname> - add user's last notice as a 'fave'\n".
 826                            "fav #<notice_id> - add notice with the given id as a 'fave'\n".
 827                            "repeat #<notice_id> - repeat a notice with a given id\n".
 828                            "repeat <nickname> - repeat the last notice from user\n".
 829                            "reply #<notice_id> - reply to notice with a given id\n".
 830                            "reply <nickname> - reply to the last notice from user\n".
 831                            "join <group> - join group\n".
 832                            "login - Get a link to login to the web interface\n".
 833                            "drop <group> - leave group\n".
 834                            "stats - get your stats\n".
 835                            "stop - same as 'off'\n".
 836                            "quit - same as 'off'\n".
 837                            "sub <nickname> - same as 'follow'\n".
 838                            "unsub <nickname> - same as 'leave'\n".
 839                            "last <nickname> - same as 'get'\n".
 840                            "on <nickname> - not yet implemented.\n".
 841                            "off <nickname> - not yet implemented.\n".
 842                            "nudge <nickname> - remind a user to update.\n".
 843                            "invite <phone number> - not yet implemented.\n".
 844                            "track <word> - not yet implemented.\n".
 845                            "untrack <word> - not yet implemented.\n".
 846                            "track off - not yet implemented.\n".
 847                            "untrack all - not yet implemented.\n".
 848                            "tracks - not yet implemented.\n".
 849                            "tracking - not yet implemented.\n"));
 850     }
 851 }