banana/spool.inc.php

   1 <?php
   2 /********************************************************************************
   3 * include/spool.inc.php : spool subroutines
   4 * -----------------------
   5 *
   6 * This file is part of the banana distribution
   7 * Copyright: See COPYING files that comes with this distribution
   8 ********************************************************************************/
   9
  10 require_once dirname(__FILE__) . '/banana.inc.php';
  11
  12 define('BANANA_SPOOL_VERSION', '0.5.12');
  13
  14 /** Class spoolhead
  15  *  class used in thread overviews
  16  */
  17 class BananaSpoolHead
  18 {
  19     public $id;
  20     public $msgid;
  21
  22     /** date (timestamp) */
  23     public $date;
  24     /** subject */
  25     public $subject;
  26     /** author */
  27     public $from;
  28     public $name;
  29     public $color;
  30     /** reference of parent */
  31     public $parent = null;
  32     /** array of children */
  33     public $children = Array();
  34     /** true if post is read */
  35     public $isread;
  36     /** number of posts deeper in this branch of tree */
  37     public $desc;
  38     /**  same as desc, but counts only unread posts */
  39     public $descunread;
  40
  41     /** storage data */
  42     public $storage = array();
  43
  44     /** constructor
  45      * @param $_date INTEGER timestamp of post
  46      * @param $_subject STRING subject of post
  47      * @param $_from STRING author of post
  48      * @param $_desc INTEGER desc value (1 for a new post)
  49      * @param $_read BOOLEAN true if read
  50      * @param $_descunread INTEGER descunread value (0 for a new post)
  51      */
  52     public function __construct($id, array &$message)
  53     {
  54         $this->id         = $id;
  55         $this->msgid      = $message['message-id'];
  56         $this->date       = $message['date'];
  57         $this->subject    = $message['subject'];
  58         $this->from       = $message['from'];
  59         $this->color      = sprintf('#%06x', abs(crc32($this->from) % 0xffffff));
  60         $this->desc       = 1;
  61         $this->isread     = true;
  62         $this->descunread = 0;
  63         if (preg_match("/^([^ ]+@[^ ]+) \((.*)\)$/", $this->from, $regs)) {
  64             $this->name = $regs[2];
  65         }
  66         if (preg_match("/^\"?([^<>\"]+)\"? +<(.+@.+)>$/", $this->from, $regs)) {
  67             $this->name = preg_replace("/^'(.*)'$/", '\1', $regs[1]);
  68             $this->name = stripslashes($this->name);
  69         }
  70         if ($this->name) {
  71             $this->name =  preg_replace("/\\\(\(|\))/","\\1", $this->name);
  72         } else if (preg_match("/([^< ]+)@([^> ]+)/", $this->from, $regs)) {
  73             $this->name = $regs[1];
  74         } else {
  75             $this->name = 'Anonymous';
  76         }
  77     }
  78 }
  79
  80
  81 class BananaSpool
  82 {
  83     private $version;
  84     private $mode;
  85
  86     /**  group name */
  87     public $group;
  88     /**  spool */
  89     public $overview = array();
  90     /**  array msgid => msgnum */
  91     public $ids      = array();
  92     /** thread starts */
  93     public $roots    = array();
  94     /** thread trees (one tree per root node) */
  95     public $trees    = array();
  96
  97     /** protocole specific data */
  98     public $storage = array();
  99
 100     private $unreadnb = 0;
 101
 102     /** constructor
 103      * @param $_group STRING group name
 104      * @param $_display INTEGER 1 => all posts, 2 => only threads with new posts
 105      * @param $_since INTEGER time stamp (used for read/unread)
 106      */
 107     protected function __construct($group)
 108     {
 109         $this->version    = BANANA_SPOOL_VERSION;
 110         $this->mode       = Banana::SPOOL_ALL;
 111         $this->group      = $group;
 112     }
 113
 114     public static function &getSpool($group, $since = 0, $clean = false)
 115     {
 116         if (!is_null(Banana::$spool) && Banana::$spool->group == $group) {
 117             $spool =& Banana::$spool;
 118         } else {
 119             $spool =& BananaSpool::readFromFile($group);
 120         }
 121         if (is_null($spool)) {
 122             $spool = new BananaSpool($group);
 123         }
 124         Banana::$spool =& $spool;
 125         $spool->build();
 126         if ($clean) {
 127             $spool->markAllAsRead();
 128         }
 129         $spool->updateUnread($since);
 130         //var_dump($spool);
 131         return $spool;
 132     }
 133
 134     private static function spoolFilename($group)
 135     {
 136         $file = Banana::$spool_root . '/' . Banana::$protocole->name() . '/';
 137         if (!is_dir($file)) {
 138             mkdir($file);
 139         }
 140         return $file . Banana::$protocole->filename();
 141     }
 142
 143     private static function &readFromFile($group)
 144     {
 145         $spool = null;
 146         $file = BananaSpool::spoolFilename($group);
 147         if (!file_exists($file)) {
 148             return $spool;
 149         }
 150         $spool =  unserialize(file_get_contents($file));
 151         if ($spool->version != BANANA_SPOOL_VERSION || $spool->mode != Banana::SPOOL_ALL) {
 152             $spool = null;
 153             return $spool;
 154         }
 155         $spool->markAllAsRead();
 156         return $spool;
 157     }
 158
 159     private function compare(&$a, &$b)
 160     {
 161         return ($b->date - $a->date);
 162     }
 163
 164     private function saveToFile()
 165     {
 166         $file = BananaSpool::spoolFilename($this->group);
 167
 168         $this->roots = Array();
 169         foreach($this->overview as &$msg) {
 170             if (is_null($msg->parent)) {
 171                 $this->roots[] =& $msg;
 172             }
 173         }
 174         usort($this->roots, array($this, 'compare'));
 175
 176         if ($this->mode == Banana::SPOOL_ALL) {
 177             file_put_contents($file, serialize($this));
 178         }
 179     }
 180
 181     private function build()
 182     {
 183         $threshold = 0;
 184
 185         // Compute the range of indexes
 186         list($msgnum, $first, $last) = Banana::$protocole->getIndexes();
 187         if ($last < $first) {
 188             $threshold = $first + $msgnum - $last;
 189             $threshold = (int)(log($threshold)/log(2));
 190             $threshold = (2 ^ ($threshold + 1)) - 1;
 191         }
 192         if (Banana::$spool_max && Banana::$spool_max < $msgnum) {
 193             $first = $last - Banana::$spool_max;
 194             if ($first < 0) {
 195                 $first += $threshold;
 196             }
 197         }
 198         $clean  = $this->clean($first, $last, $msgnum);
 199         $update = $this->update($first, $last, $msgnum);
 200
 201         if ($clean || $update) {
 202             $this->saveToFile();
 203         }
 204     }
 205
 206     private function clean(&$first, &$last, $msgnum)
 207     {
 208         $do_save = false;
 209         if (!empty($this->overview)) {
 210             $mids = array_keys($this->overview);
 211             foreach ($mids as $id) {
 212                 if (($first <= $last && ($id < $first || $id > $last))
 213                         || ($first > $last && $id < $first && $id > $last)) {
 214                     $this->delid($id, false);
 215                     $do_save = true;
 216                 }
 217             }
 218             if (!empty($this->overview)) {
 219                 $first = max(array_keys($this->overview))+1;
 220             }
 221         }
 222         return $do_save;
 223     }
 224
 225     private function update(&$first, &$last, $msgnum)
 226     {
 227         if ($first > $last || !$msgnum) {
 228             return false;
 229         }
 230
 231         $messages =& Banana::$protocole->getMessageHeaders($first, $last,
 232             array('Date', 'Subject', 'From', 'Message-ID', 'References', 'In-Reply-To'));
 233
 234         // Build all the new Spool Heads
 235         foreach ($messages as $id=>&$message) {
 236             if (!isset($this->overview[$id])) {
 237                 $this->overview[$id] = new BananaSpoolHead($id, $message);
 238                 $head =& $this->overview[$id];
 239                 $this->ids[$head->msgid] =& $head;
 240             }
 241         }
 242
 243         // Build tree
 244         $updateTrees = array();
 245         $null = null;
 246         foreach ($messages as $id=>&$message) {
 247             $msg         =& $this->overview[$id];
 248             $parents     =& $this->getReferences($message);
 249             while (!empty($parents) && ($msg->parent === $msg || is_null($msg->parent))) {
 250                 $msg->parent =& array_pop($parents);
 251             }
 252
 253             if (!is_null($msg->parent)) {
 254                 $parent =& $msg->parent;
 255                 $parent->children[] =& $msg;
 256                 while (!is_null($parent)) {
 257                     $parent->desc += $msg->desc;
 258                     $prev =& $p;
 259                     if ($parent !== $parent->parent) {
 260                         $parent =& $parent->parent;
 261                     } else {
 262                         $parent =& $null;
 263                     }
 264                 }
 265                 $updateTrees[$prev->id] = true;
 266             }
 267         }
 268         foreach ($updateTrees as $root=>$t) {
 269             $this->trees[$root] =& $this->buildTree($root);
 270         }
 271         Banana::$protocole->updateSpool($messages);
 272         return true;
 273     }
 274
 275     public function updateUnread($since)
 276     {
 277         if (empty($since)) {
 278             return;
 279         }
 280
 281         $newpostsids = Banana::$protocole->getNewIndexes($since);
 282
 283         if (empty($newpostsids)) {
 284             return;
 285         }
 286
 287         $newpostsids = array_intersect($newpostsids, array_keys($this->ids));
 288         foreach ($newpostsids as $mid) {
 289             $overview =& $this->ids[$mid];
 290             if ($overview->isread) {
 291                 $overview->isread = false;
 292                 while (!is_null($overview)) {
 293                     $overview->descunread++;
 294                     $overview =& $overview->parent;
 295                 }
 296             }
 297         }
 298         $this->unreadnb += count($newpostsids);
 299     }
 300
 301     public function setMode($mode)
 302     {
 303         $this->mode = $mode;
 304         switch ($mode) {
 305           case Banana::SPOOL_UNREAD:
 306             $num = max(array_keys($this->overview));
 307             if ($this->overview[$num]->isread) {
 308                 break;
 309             }
 310             foreach ($this->roots as &$root) {
 311                 if ($root->descunread == 0) {
 312                     $this->killdesc($root->id);
 313                 }
 314             }
 315             break;
 316         }
 317     }
 318
 319     /** Fetch list of references
 320      */
 321     public function &getReferences(array &$refs)
 322     {
 323         $references = array();
 324         if (isset($refs['references'])) {
 325             $text = preg_split('/\s/', str_replace('><', '> <', $refs['references']));
 326             foreach ($text as $id=>&$value) {
 327                 if (isset($this->ids[$value])) {
 328                     $references[] =& $this->ids[$value];
 329                 }
 330             }
 331         } elseif (isset($refs['in-reply-to']) && isset($this->ids[$refs['in-reply-to']])) {
 332             $references[] =& $this->ids[$refs['in-reply-to']];
 333         }
 334         return $references;
 335     }
 336
 337     /** Mark the given id as read
 338      * @param id MSGNUM of post
 339      */
 340     public function markAsRead($id)
 341     {
 342         if (!$this->overview[$id]->isread) {
 343             $this->overview[$id]->isread = true;
 344             $this->unreadnb--;
 345             while (isset($id)) {
 346                 $this->overview[$id]->descunread--;
 347                 $id = $this->overview[$id]->parent;
 348             }
 349         }
 350     }
 351
 352     /** Mark all unread messages as read
 353      */
 354     public function markAllAsRead(array &$array = null)
 355     {
 356         if (!$this->unreadnb) {
 357             return;
 358         }
 359         if (is_null($array) && !empty($this->roots)) {
 360             $array =& $this->roots;
 361         } elseif (is_null($array)) {
 362             return;
 363         }
 364         foreach ($array as &$msg) {
 365             if (!$msg->isread) {
 366                 $this->markAsRead($msg->id);
 367                 if (!$this->unreadnb) {
 368                     return;
 369                 }
 370             }
 371             if ($msg->descunread) {
 372                 $this->markAllAsRead($msg->children);
 373             }
 374         }
 375     }
 376
 377     /** kill post and childrens
 378      * @param $_id MSGNUM of post
 379      */
 380     private function killdesc($_id)
 381     {
 382         $overview =& $this->overview[$_id];
 383         $children =& $overview->children;
 384         if (sizeof($children)) {
 385             foreach ($children as &$c) {
 386                 $this->killdesc($c->id);
 387             }
 388         }
 389         unset($this->overview[$_id]);
 390         foreach ($this->roots as $k=>&$root) {
 391             if ($root === $overview) {
 392                 unset($this->roots[$k]);
 393                 break;
 394             }
 395         }
 396         unset($this->ids[$overview->msgid]);
 397         unset($this->trees[$_id]);
 398         $overview = null;
 399     }
 400
 401     /** delete a post from overview
 402      * @param $_id MSGNUM of post
 403      */
 404     public function delid($_id, $write = true)
 405     {
 406         if (!isset($this->overview[$_id])) {
 407             return;
 408         }
 409
 410         $overview =& $this->overview[$_id];
 411         // Be sure it is not counted as unread
 412         if (!$overview->isread) {
 413             $this->markAsRead($_id);
 414         }
 415
 416         $parent =& $overview->parent;
 417
 418         // Remove from the message tree
 419         if (!is_null($parent)) {
 420             foreach ($parent->children as $key=>&$child) {
 421                 if ($child === $overview) {
 422                     unset($parent->children[$key]);
 423                     break;
 424                 }
 425             }
 426             if (sizeof($overview->children)) {
 427                 $parent->children = array_merge($parent->children, $overview->children);
 428                 foreach ($overview->children as &$child) {
 429                     $child->parent =& $parent;
 430                 }
 431             }
 432             while (!is_null($parent)) {
 433                 $parent->desc--;
 434                 $parent =& $parent->parent;
 435             }
 436         }
 437
 438         // Remove all refenrences and assign null to the object
 439         unset($this->ids[$overview->msgid]);
 440         unset($this->overview[$_id]);
 441         unset($this->trees[$_id]);
 442         foreach ($this->roots as $k=>&$root) {
 443             if ($root === $overview) {
 444                 unset($this->roots[$k]);
 445                 break;
 446             }
 447         }
 448         $overview = null;
 449
 450         if ($write) {
 451             $this->saveToFile();
 452         }
 453     }
 454
 455     public function formatDate(BananaSpoolHead &$head)
 456     {
 457         $stamp  = $head->date;
 458         $today  = intval(time() / (24*3600));
 459         $dday   = intval($stamp / (24*3600));
 460
 461         if ($today == $dday) {
 462             $format = "%H:%M";
 463         } elseif ($today == 1 + $dday) {
 464             $format = _b_('hier')." %H:%M";
 465         } elseif ($today < 7 + $dday) {
 466             $format = '%a %H:%M';
 467         } elseif ($today < 90 + $dday) {
 468             $format = '%a %e %b';
 469         } else {
 470             $format = '%a %e %b %Y';
 471         }
 472         return strftime($format, $stamp);
 473     }
 474
 475     public function formatSubject(BananaSpoolHead &$head)
 476     {
 477         $subject = $popup = $head->subject;
 478         $popup = $subject;
 479         if (function_exists('hook_formatDisplayHeader')) {
 480             list($subject, $link) = hook_formatDisplayHeader('subject', $subject, true);
 481         } else {
 482             $subject = banana_catchFormats(banana_entities(stripslashes($subject)));
 483             $link = null;
 484         }
 485         if (empty($subject)) {
 486             $subject = _b_('(pas de sujet)');
 487         }
 488         if ($head->id != Banana::$artid) {
 489             $subject = Banana::$page->makeLink(Array('group' => $this->group, 'artid' => $head->id,
 490                                                      'text'  => $subject, 'popup' => $popup));
 491         }
 492         return $subject . $link;
 493     }
 494
 495     public function formatFrom(BananaSpoolHead &$head)
 496     {
 497         return BananaMessage::formatFrom($head->from);
 498     }
 499
 500     public function start()
 501     {
 502         if (Banana::$first) {
 503             return Banana::$first;
 504         } else {
 505             $first = array_search(Banana::$artid, $this->roots);
 506             return max(0, $first - Banana::$spool_tbefore);
 507         }
 508     }
 509
 510     public function context()
 511     {
 512         return Banana::$first ? Banana::$spool_tmax : Banana::$spool_tcontext;
 513     }
 514
 515
 516     private function &_buildTree(BananaSpoolHead &$head) {
 517         static $t_e, $u_h, $u_ht, $u_vt, $u_l, $u_f, $r_h, $r_ht, $r_vt, $r_l, $r_f;
 518         if (!isset($spfx_f)) {
 519             $t_e   = Banana::$page->makeImg(Array('img' => 'e',  'alt' => '&nbsp;', 'height' => 18,  'width' => 14));
 520             $u_h   = Banana::$page->makeImg(Array('img' => 'h2', 'alt' => '-', 'height' => 18,  'width' => 14));
 521             $u_ht  = Banana::$page->makeImg(Array('img' => 'T2', 'alt' => '+', 'height' => 18, 'width' => 14));
 522             $u_vt  = Banana::$page->makeImg(Array('img' => 't2', 'alt' => '`', 'height' => 18, 'width' => 14));
 523             $u_l   = Banana::$page->makeImg(Array('img' => 'l2', 'alt' => '|', 'height' => 18, 'width' => 14));
 524             $u_f   = Banana::$page->makeImg(Array('img' => 'f2', 'alt' => 't', 'height' => 18, 'width' => 14));
 525             $r_h   = Banana::$page->makeImg(Array('img' => 'h2r', 'alt' => '-', 'height' => 18,  'width' => 14));
 526             $r_ht  = Banana::$page->makeImg(Array('img' => 'T2r', 'alt' => '+', 'height' => 18, 'width' => 14));
 527             $r_vt  = Banana::$page->makeImg(Array('img' => 't2r', 'alt' => '`', 'height' => 18, 'width' => 14));
 528             $r_l   = Banana::$page->makeImg(Array('img' => 'l2r', 'alt' => '|', 'height' => 18, 'width' => 14));
 529             $r_f   = Banana::$page->makeImg(Array('img' => 'f2r', 'alt' => 't', 'height' => 18, 'width' => 14));
 530         }
 531         $style = 'background-color:' . $head->color . '; text-decoration: none';
 532         $text = '<span style="' . $style . '" title="' . banana_entities($head->name . ', ' . $this->formatDate($head))
 533               . '"><input type="radio" name="banana_tree" '
 534               . (Banana::$msgshow_javascript ? 'onchange="window.location=\'' .
 535                     banana_entities(Banana::$page->makeURL(array('group' => $this->group, 'artid' => $id))) . '\'"'
 536                     : ' disabled="disabled"')
 537               . ' /></span>';
 538         $array = array($text);
 539         foreach ($head->children as $key=>&$msg) {
 540             $tree =& $this->_buildTree($msg);
 541             $last = $key == count($head->children) - 1;
 542             foreach ($tree as $kt=>&$line) {
 543                 if ($kt === 0 && $key === 0 && !$last) {
 544                     $array[0] .= ($msg->isread ? $r_ht : $u_ht) . $line;
 545                 } else if($kt === 0 && $key === 0) {
 546                     $array[0] .= ($msg->isread ? $r_h : $u_h)  . $line;
 547                 } else if ($kt === 0 && $last) {
 548                     $array[] = $t_e . ($msg->isread ? $r_vt : $u_vt) . $line;
 549                 } else if ($kt === 0) {
 550                     $array[] = $t_e . ($msg->isread ? $r_f : $u_f) . $line;
 551                 } else if ($last) {
 552                     $array[] = $t_e . $t_e . $line;
 553                 } else {
 554                     $array[] = $t_e . ($msg->isread ? $r_l : $u_l) . $line;
 555                 }
 556             }
 557             unset($tree);
 558         }
 559         return $array;
 560     }
 561
 562     /** build the spool tree associated with the given message
 563      */
 564     public function &buildTree($id, $force = false) {
 565         $id = $this->root($id);
 566         if (!$force && isset($this->trees[$id])) {
 567             return $this->trees[$id];
 568         } else {
 569             $tree =& $this->_buildTree($this->overview[$id]);
 570             $tree = '<div class="tree"><div style="height:18px">'
 571                   . implode("</div>\n<div style=\"height:18px\">", $tree)
 572                   . '</div></div>';
 573             return $tree;
 574         }
 575     }
 576
 577     /** computes linear post index
 578      * @param $_id INTEGER MSGNUM of post
 579      * @return INTEGER linear index of post
 580      */
 581     public function getNdX($_id)
 582     {
 583         $ndx    = 1;
 584         $id_cur = $_id;
 585         while (true) {
 586             $id_parent = $this->overview[$id_cur]->parent;
 587             if (is_null($id_parent)) break;
 588             $pos = array_search($id_cur, $this->overview[$id_parent]->children);
 589
 590             for ($i = 0; $i < $pos ; $i++) {
 591                 $ndx += $this->overview[$this->overview[$id_parent]->children[$i]]->desc;
 592             }
 593             $ndx++; //noeud père
 594
 595             $id_cur = $id_parent;
 596         }
 597
 598         foreach ($this->roots as $i) {
 599             if ($i==$id_cur) {
 600                 break;
 601             }
 602             $ndx += $this->overview[$i]->desc;
 603         }
 604         return $ndx;
 605     }
 606
 607     /** Return root message of the given thread
 608      * @param id INTEGER id of a message
 609      */
 610     public function root($id)
 611     {
 612         while (true) {
 613             $id_parent = $this->overview[$id]->parent;
 614             if (is_null($id_parent)) break;
 615             $id = $id_parent;
 616         }
 617         return $id;
 618     }
 619
 620     /** Return the last post id with the given subject
 621      * @param subject
 622      */
 623     public function getPostId($subject)
 624     {
 625         $subject = trim($subject);
 626         $id = max(array_keys($this->overview));
 627         while (isset($this->overview[$id])) {
 628             $test = $this->overview[$id]->subject;
 629             if (function_exists('hook_formatDisplayHeader')) {
 630                 $val = hook_formatDisplayHeader('subject', $test, true);
 631                 if (is_array($val)) {
 632                     $test = banana_html_entity_decode($val[0]);
 633                 } else {
 634                     $test = banana_html_entity_decode($val);
 635                 }
 636             }
 637             $test = trim($test);
 638             if ($test == $subject) {
 639                 return $id;
 640             }
 641             $id--;
 642         }
 643         return -1;
 644     }
 645
 646     /** Returns previous thread root index
 647      * @param id INTEGER message number
 648      */
 649     public function prevThread($id)
 650     {
 651         $root = $this->root($id);
 652         $last = null;
 653         foreach ($this->roots as $i) {
 654             if ($i == $root) {
 655                 return $last;
 656             }
 657             $last = $i;
 658         }
 659         return $last;
 660     }
 661
 662     /** Returns next thread root index
 663      * @param id INTEGER message number
 664      */
 665     public function nextThread($id)
 666     {
 667         $root = $this->root($id);
 668         $ok   = false;
 669         foreach ($this->roots as $i) {
 670             if ($ok) {
 671                 return $i;
 672             }
 673             if ($i == $root) {
 674                 $ok = true;
 675             }
 676         }
 677         return null;
 678     }
 679
 680     /** Return prev post in the thread
 681      * @param id INTEGER message number
 682      */
 683     public function prevPost($id)
 684     {
 685         $parent = $this->overview[$id]->parent;
 686         if (is_null($parent)) {
 687             return null;
 688         }
 689         $last = $parent;
 690         foreach ($this->overview[$parent]->children as $child) {
 691             if ($child == $id) {
 692                 return $last;
 693             }
 694             $last = $child;
 695         }
 696         return null;
 697     }
 698
 699     /** Return next post in the thread
 700      * @param id INTEGER message number
 701      */
 702     public function nextPost($id)
 703     {
 704         if (count($this->overview[$id]->children) != 0) {
 705             return $this->overview[$id]->children[0];
 706         }
 707
 708         $cur    = $id;
 709         while (true) {
 710             $parent = $this->overview[$cur]->parent;
 711             if (is_null($parent)) {
 712                 return null;
 713             }
 714             $ok = false;
 715             foreach ($this->overview[$parent]->children as $child) {
 716                 if ($ok) {
 717                     return $child;
 718                 }
 719                 if ($child == $cur) {
 720                     $ok = true;
 721                 }
 722             }
 723             $cur = $parent;
 724         }
 725         return null;
 726     }
 727
 728     /** Look for an unread message in the thread rooted by the message
 729      * @param id INTEGER message number
 730      */
 731     private function _nextUnread($id)
 732     {
 733         if (!$this->overview[$id]->isread) {
 734             return $id;
 735         }
 736         foreach ($this->overview[$id]->children as $child) {
 737             $unread = $this->_nextUnread($child);
 738             if (!is_null($unread)) {
 739                 return $unread;
 740             }
 741         }
 742         return null;
 743     }
 744
 745     /** Find next unread message
 746      * @param id INTEGER message number
 747      */
 748     public function nextUnread($id = null)
 749     {
 750         if (!$this->unreadnb) {
 751             return null;
 752         }
 753
 754         if (!is_null($id)) {
 755             // Look in message children
 756             foreach ($this->overview[$id]->children as $child) {
 757                 $next = $this->_nextUnread($child);
 758                 if (!is_null($next)) {
 759                     return $next;
 760                 }
 761             }
 762         }
 763
 764         // Look in current thread
 765         $cur = $id;
 766         do {
 767             $parent = is_null($cur) ? null : $this->overview[$cur]->parent;
 768             $ok     = is_null($cur) ? true : false;
 769             if (!is_null($parent)) {
 770                 $array = &$this->overview[$parent]->children;
 771             } else {
 772                 $array = &$this->roots;
 773             }
 774             foreach ($array as $child) {
 775                 if ($ok) {
 776                     $next = $this->_nextUnread($child);
 777                     if (!is_null($next)) {
 778                         return $next;
 779                     }
 780                 }
 781                 if ($child == $cur) {
 782                     $ok = true;
 783                 }
 784             }
 785             $cur = $parent;
 786         } while(!is_null($cur));
 787         return null;
 788     }
 789 }
 790
 791 // vim:set et sw=4 sts=4 ts=4 enc=utf-8:
 792 ?>