squirrelmail/functions/mailbox_display.php

<?php

/**
 * mailbox_display.php
 *
 * Copyright (c) 1999-2002 The SquirrelMail Project Team
 * Licensed under the GNU GPL. For full terms see the file COPYING.
 *
 * This contains functions that display mailbox information, such as the
 * table row that has sender, date, subject, etc...
 *
 * $Id$
 */

require_once('../functions/strings.php');

/* Default value for page_selector_max. */
define('PG_SEL_MAX', 10);

function printMessageInfo($imapConnection, $t, $i, $key, $mailbox, $sort, 
			  $start_msg, $where, $what){
  global $checkall, 
    $color, $msgs, $msort,
    $sent_folder, $draft_folder,
    $default_use_priority,
    $message_highlight_list,
    $index_order,
    $indent_array,   /* indent subject by */
    $pos,            /* Search postion (if any)  */
    $thread_sort_messages, /* thread sorting on/off */
    $server_sort_order, /* sort value when using server-sorting */
    $row_count,
	$allow_server_sort; /* enable/disable server-side sorting */
  $color_string = $color[4];
  
  if ($GLOBALS['alt_index_colors']) {
    if (!isset($row_count)) {
      $row_count = 0;
    }
    $row_count++;
    if ($row_count % 2) {
      if (!isset($color[12])) {
	$color[12] = '#EAEAEA';
      }
      $color_string = $color[12];
    }
  }
  $msg = $msgs[$key];
  
  /*
   * This is done in case you're looking into Sent folders,
   * because you can have multiple receivers.
   */
  $senderNames = explode(',', $msg['FROM']);
  $senderName = '';
  if (sizeof($senderNames)){
    foreach ($senderNames as $senderNames_part) {
      if ($senderName != '') {
	$senderName .= ', ';
      }
      $senderName .= sqimap_find_displayable_name($senderNames_part);
    }
  }
  
  if( $mailbox == 'None' ) {
    $boxes = sqimap_mailbox_list($imapConnection);
    $mailbox = $boxes[0]['unformatted'];
    unset( $boxes );
  }
  $urlMailbox = urlencode($mailbox);
  $subject = processSubject($msg['SUBJECT']);
  echo "<TR>\n";
  
  if (isset($msg['FLAG_FLAGGED']) && ($msg['FLAG_FLAGGED'] == true)) {
    $flag = "<font color=\"$color[2]\">";
    $flag_end = '</font>';
  } else {
    $flag = '';
    $flag_end = '';
  }
  if (!isset($msg['FLAG_SEEN']) || ($msg['FLAG_SEEN'] == false)) {
    $bold = '<b>';
    $bold_end = '</b>';
  } else {
    $bold = '';
    $bold_end = '';
  }
  if (handleAsSent($mailbox)) {
    $italic = '<i>';
    $italic_end = '</i>';
  } else {
    $italic = '';
    $italic_end = '';
  }
  if (isset($msg['FLAG_DELETED']) && $msg['FLAG_DELETED']) {
    $fontstr = "<font color=\"$color[9]\">";
    $fontstr_end = '</font>';
  } else {
    $fontstr = '';
    $fontstr_end = '';
  }
  
  /**
   * AAAAH! Make my eyes stop bleeding!
   * Who wrote this?!
   */
  if (sizeof($message_highlight_list)){
    foreach ($message_highlight_list as $message_highlight_list_part) {
      if (trim($message_highlight_list_part['value']) != '') {
	if ($message_highlight_list_part['match_type'] == 'to_cc') {
	  if (strstr('^^' . strtolower($msg['TO']), 
		     strtolower($message_highlight_list_part['value']))
	      || strstr('^^'.strtolower($msg['CC']), 
			strtolower($message_highlight_list_part['value']))) {
	    $hlt_color = $message_highlight_list_part['color'];
	    continue;
	  }
	} else 
	  if (strstr('^^' . strtolower($msg[strtoupper($message_highlight_list_part['match_type'])]), 
		     strtolower($message_highlight_list_part['value']))) {
	    $hlt_color = $message_highlight_list_part['color'];
	    continue;
	  }
      }
    }
  }

  if (!isset($hlt_color)) {
    $hlt_color = $color_string;
  }
  
  if ($where && $what) {
    if(!isset($pos) || $pos == '') {
      $pos = '0';
    }
    $search_stuff = "&amp;pos=" . urlencode($pos) 
      . "&amp;where=" . urlencode($where) . '&amp;what=' . urlencode($what);
  } else {
    $search_stuff = '';
  }
  
  $checked = ($checkall == 1) ? ' checked' : '';
  
  if (sizeof($index_order)){
    foreach ($index_order as $index_order_part) {
      switch ($index_order_part) {
      case 1: /* checkbox */
	echo "   <td bgcolor=\"$hlt_color\" align=center>"
	  . "<input type=checkbox name=\"msg[$t]\" value=" 
	  . $msg["ID"]."$checked></TD>\n";
	break;
      case 2: /* from */
	echo "   <td bgcolor=\"$hlt_color\">$italic$bold$flag$fontstr"
	  . "$senderName$fontstr_end$flag_end$bold_end$italic_end</td>\n";
	break;
      case 3: /* date */
	echo "   <td nowrap bgcolor=\"$hlt_color\"><center>$bold$flag$fontstr"
	  . $msg["DATE_STRING"] 
	  . "$fontstr_end$flag_end$bold_end</center></td>\n";
	break;
      case 4: /* subject */
	echo "   <td bgcolor=\"$hlt_color\">$bold";
	if ($thread_sort_messages == 1) {
	  echo str_repeat("&nbsp;&nbsp;&nbsp;&nbsp;",$indent_array[$msg["ID"]]);
	}
	echo "<a href=\"read_body.php?mailbox=$urlMailbox&amp;passed_id="
	  . $msg["ID"] 
	  . "&amp;startMessage=$start_msg&amp;show_more=0$search_stuff\"";
	do_hook("subject_link");
	if ($subject != $msg['SUBJECT']) {
	  $title = get_html_translation_table(HTML_SPECIALCHARS);
	  $title = array_flip($title);
	  $title = strtr($msg['SUBJECT'], $title);
	  $title = str_replace('"', "''", $title);
	  echo " title=\"$title\"";
	}
	echo ">$flag$subject$flag_end</a>$bold_end</td>\n";
	break;
      case 5: /* flags */
	$stuff = false;
	echo "   <td bgcolor=\"$hlt_color\" align=center nowrap><b><small>\n";
	if (isset($msg['FLAG_ANSWERED']) && $msg['FLAG_ANSWERED'] == true) {
	  echo _("A") . "\n";
	  $stuff = true;
	}
	if ($msg['TYPE0'] == 'multipart') {
	  echo "+\n";
	  $stuff = true;
	}
	if ($default_use_priority) {
	  if ( ($msg['PRIORITY'][0] == 1) || ($msg['PRIORITY'][0] == 2) ) {
	    echo "<font color=\"$color[1]\">!</font>\n";
	    $stuff = true;
	  }
	  if ($msg['PRIORITY'][0] == 5) {
	    echo "<font color=\"$color[8]\">?</font>\n";
	    $stuff = true;
	  }
	}
	if (isset($msg['FLAG_DELETED']) && $msg['FLAG_DELETED'] == true) {
	  echo "<font color=\"$color[1]\">D</font>\n";
	  $stuff = true;
	}
	if (!$stuff) {
	  echo "&nbsp;\n";
	}
	echo "</small></b></td>\n";
	break;
      case 6: /* size */
	echo "   <td bgcolor=\"$hlt_color\">$bold$fontstr"
	  . show_readable_size($msg['SIZE']) . "$fontstr_end$bold_end</td>\n";
	break;
      }
    }
  }
  echo "</tr>\n";
}

/*
 * This function loops through a group of messages in the mailbox
 * and shows them to the user.
 */
function showMessagesForMailbox($imapConnection, $mailbox, $num_msgs, 
				$start_msg, $sort, $color, $show_num, 
				$use_cache) {
  global $msgs, $msort,
    $sent_folder, $draft_folder,
    $message_highlight_list, 
    $auto_expunge, $thread_sort_messages, $allow_server_sort,
    $data_dir, $username, $server_sort_order;

  /* This code and the next if() block check for
   * server-side sorting methods. The $id array is
   * formatted and $sort is set to 6 to disable 
   * SM internal sorting
   */
  if ($thread_sort_messages == 1) {
    $id = get_thread_sort($imapConnection);
  if ($id == 'no') {
      echo '<b><small><center><font color=red>Thread sorting is not'.
             ' supported by your IMAP server.<br>Please report this'.
             'to the system administrator.</center></small></b>';
     $thread_sort_messages == 0; 
    $id = array();
  }
  else {
      $sort = 6;
      if ($start_msg + ($show_num - 1) < $num_msgs) {
        $end_msg = $start_msg + ($show_num-1);
      } 
      else {
        $end_msg = $num_msgs;
      }
      $id = array_slice($id, ($start_msg-1), ($end_msg));
      }
  }

  if ($allow_server_sort == TRUE && $thread_sort_messages != 1) {
    $server_sort_order = $sort;
    $id = sqimap_get_sort_order($imapConnection, $server_sort_order);
  if ($id == 'no') {
    echo '<b><small><center><font color=red>Server-side sorting '.
       'is not supported by your IMAP server.<br>Please report this'.
       ' to the system administrator.</center></small></b>';
    $sort = $server_sort_order;
	  $allow_server_sort = false;
	  $id = array();
	}
	else {
      $sort = 6;
      if ($start_msg + ($show_num - 1) < $num_msgs) {
        $end_msg = $start_msg + ($show_num-1);
      } 
	  else {
        $end_msg = $num_msgs;
      }
      $id = array_slice($id, ($start_msg-1), ($end_msg));
	}
  }

  /* If autoexpunge is turned on, then do it now. */
  if ($auto_expunge == true) {
    sqimap_mailbox_expunge($imapConnection, $mailbox, false);
  }
  sqimap_mailbox_select($imapConnection, $mailbox);
  $issent = handleAsSent($mailbox);
  if (!$use_cache) {
    /* If it is sorted... */
    if ($num_msgs >= 1) {
      if ($sort < 6 ) {
	$id = range(1, $num_msgs);
      } 
      elseif ($thread_sort_messages != 1 && $allow_server_sort != TRUE && $sort == 6) {
	/* if it's not sorted */
	if ($start_msg + ($show_num - 1) < $num_msgs){
	  $end_msg = $start_msg + ($show_num - 1);
	} else {
	  $end_msg = $num_msgs;
	}
	if ($end_msg < $start_msg) {
	  $start_msg = $start_msg - $show_num;
	  if ($start_msg < 1) {
	    $start_msg = 1;
	  }
	}

	$real_startMessage = $num_msgs - $start_msg + 1;
	$real_endMessage = $num_msgs - $start_msg - $show_num + 2;
	if ($real_endMessage <= 0) {
	  $real_endMessage = 1;
	}
	$id = array_reverse(range($real_endMessage, $real_startMessage));
      }
      $msgs_list = sqimap_get_small_header_list($imapConnection, $id, $issent);
      $flags = sqimap_get_flags_list($imapConnection, $id, $issent);
      if (sizeof($msgs_list)){
	foreach ($msgs_list as $hdr) {
	  $from[] = $hdr->from;
	  $date[] = $hdr->date;
	  $subject[] = $hdr->subject;
	  $to[] = $hdr->to;
	  $priority[] = $hdr->priority;
	  $cc[] = $hdr->cc;
	  $size[] = $hdr->size;
	  $type[] = $hdr->type0;
	}
      }
    }
    $j = 0;
    if ($sort == 6) {
      $end = $start_msg + $show_num - 1;
      if ($num_msgs < $show_num) {
	$end_loop = $num_msgs;
      } else if ($end > $num_msgs) {
	$end_loop = $num_msgs - $start_msg + 1;
      } else {
	$end_loop = $show_num;
      }
    } else {
      $end = $num_msgs;
      $end_loop = $end;
    }
    while ($j < $end_loop) {
      if (isset($date[$j])) {
	$date[$j] = str_replace('  ', ' ', $date[$j]);
	$tmpdate = explode(' ', trim($date[$j]));
      } else {
	$tmpdate = $date = array('', '', '', '', '', '');
      }
      
      $messages[$j]['TIME_STAMP'] = getTimeStamp($tmpdate);
      $messages[$j]['DATE_STRING'] = 
	getDateString($messages[$j]['TIME_STAMP']);
      $messages[$j]['ID'] = $id[$j];
      $messages[$j]['FROM'] = decodeHeader($from[$j]);
      $messages[$j]['FROM-SORT'] = 
	strtolower(sqimap_find_displayable_name(decodeHeader($from[$j])));
      $messages[$j]['SUBJECT'] = decodeHeader($subject[$j]);
      $messages[$j]['SUBJECT-SORT'] = strtolower(decodeHeader($subject[$j]));
      $messages[$j]['TO'] = decodeHeader($to[$j]);
      $messages[$j]['PRIORITY'] = $priority[$j];
      $messages[$j]['CC'] = $cc[$j];
      $messages[$j]['SIZE'] = $size[$j];
      $messages[$j]['TYPE0'] = $type[$j];
      
      /*
       * fix SUBJECT-SORT to remove Re:
       *     vedr|sv  (Danish)
       *     re|aw (English)
       *
       * TODO: i18n should be incorporated here. E.g. we catch the ones
       * we know about, but also define in i18n what the localized
       * "Re: " is for this or that locale.
       */
      if (preg_match("/^(vedr|sv|re|aw):\s*(.*)$/si", 
		     $messages[$j]['SUBJECT-SORT'], $matches)){
	$messages[$j]['SUBJECT-SORT'] = $matches[2];
      }
      
      $num = 0;
      while ($num < count($flags[$j])) {
	if ($flags[$j][$num] == 'Deleted') {
	  $messages[$j]['FLAG_DELETED'] = true;
	} else if ($flags[$j][$num] == 'Answered') {
	  $messages[$j]['FLAG_ANSWERED'] = true;
	} else if ($flags[$j][$num] == 'Seen') {
	  $messages[$j]['FLAG_SEEN'] = true;
	} else if ($flags[$j][$num] == 'Flagged') {
	  $messages[$j]['FLAG_FLAGGED'] = true;
	}
	$num++;
      }
      $j++;
    }

    /*
     * Only ignore messages flagged as deleted if we are 
     * using a trash folder or auto_expunge
     */
    if (((isset($move_to_trash) && $move_to_trash)
	 || (isset($auto_expunge) && $auto_expunge))
	&& $sort != 6) {
      
      /* Find and remove the ones that are deleted */
      $i = 0;
      $j = 0;

      while ($j < $num_msgs) {
	if (isset($messages[$j]['FLAG_DELETED']) 
	    && $messages[$j]['FLAG_DELETED'] == true) {
	  $j++;
	  continue;
	}
	$msgs[$i] = $messages[$j];
	
	$i++;
	$j++;
      }
      $num_msgs = $i;
    } else {
      if (!isset($messages)) {
	$messages = array();
      }
      $msgs = $messages;
    }
  }

  /* There's gotta be messages in the array for it to sort them. */
  if (($num_msgs > 0) && (!$use_cache)) {
    /*
     * 0 = Date (up)
     * 1 = Date (dn)
     * 2 = Name (up)
     * 3 = Name (dn)
     * 4 = Subject (up)
     * 5 = Subject (dn)
     */
    session_unregister('msgs');
    if (($sort == 0) || ($sort == 1)) {
      $msort = array_cleave ($msgs, 'TIME_STAMP');
    } elseif (($sort == 2) || ($sort == 3)) {
      $msort = array_cleave ($msgs, 'FROM-SORT');
    } elseif (($sort == 4) || ($sort == 5)) {
      $msort = array_cleave ($msgs, 'SUBJECT-SORT');
    } else {
      $msort = $msgs;
    }
    
    if ($sort < 6) {
      if ($sort % 2) {
	asort($msort);
      } else {
	arsort($msort);
      }
    }		
    session_register('msort');
  } elseif ($thread_sort_messages == 1 || $allow_server_sort == TRUE) {
    $msort = $msgs;
    session_unregister('msgs');
    session_register('msort');
  }
  displayMessageArray($imapConnection, $num_msgs, $start_msg, $msgs, 
		      $msort, $mailbox, $sort, $color,$show_num);
  /**
   * TODO: Switch to using $_SESSION[] whenever we ditch the 4.0.x series.
   */
  session_register('msgs');
}

/* Generic function to convert the msgs array into an HTML table. */
function displayMessageArray($imapConnection, $num_msgs, $start_msg, 
			     &$msgs, $msort, $mailbox, $sort, $color, 
			     $show_num) {
  global $folder_prefix, $sent_folder, 
    $imapServerAddress, $data_dir, $username, $use_mailbox_cache, 
    $index_order, $real_endMessage, $real_startMessage, $checkall, 
    $indent_array, $thread_sort_messages, $allow_server_sort, $server_sort_order;

  /* If cache isn't already set, do it now. */
  if (!session_is_registered('msgs')) {
    session_register('msgs');
  }
  if (!session_is_registered('msort')) {
    session_register('msort');
  }
  
  if ($start_msg + ($show_num - 1) < $num_msgs){
    $end_msg = $start_msg + ($show_num - 1);
  } else {
    $end_msg = $num_msgs;
  }

  if ($end_msg < $start_msg) {
    $start_msg = $start_msg - $show_num;
    if ($start_msg < 1) {
      $start_msg = 1;
    }
  }

  $urlMailbox = urlencode($mailbox);

  do_hook('mailbox_index_before');

  $msg_cnt_str = get_msgcnt_str($start_msg, $end_msg, $num_msgs);
  $paginator_str = get_paginator_str($urlMailbox, $start_msg, $end_msg, 
				     $num_msgs, $show_num, $sort);

  if (!isset($msg)) {
    $msg = '';
  }

  /* get indent level for subject display */
  if ($thread_sort_messages == 1 ) {
    $indent_array = get_parent_level($imapConnection);
  }
  $fstring = "move_messages.php?msg=$msg&amp;mailbox=$urlMailbox"
    . "&amp;startMessage=$start_msg";
  mail_message_listing_beginning($imapConnection, $fstring,
				 $mailbox, $sort, $msg_cnt_str, 
				 $paginator_str, $start_msg);

  $groupNum = $start_msg % ($show_num - 1);
  $real_startMessage = $start_msg;
  if ($sort == 6) {
    if ($end_msg - $start_msg < $show_num - 1) {
      $end_msg = $end_msg - $start_msg + 1;
      $start_msg = 1;
    } else if ($start_msg > $show_num) {
      $end_msg = $show_num;
      $start_msg = 1;
    }
  }
  $endVar = $end_msg + 1;
  
  /*
   * Loop through and display the info for each message. 
   * ($t is used for the checkbox number)
   */
  $t = 0;
  if ($num_msgs == 0) {
    /* if there's no messages in this folder */
    echo "<TR><TD BGCOLOR=\"$color[4]\" COLSPAN=" 
      . count($index_order) . ">\n"
      . "  <CENTER><BR><B>". _("THIS FOLDER IS EMPTY") 
      . "</B><BR>&nbsp;</CENTER>\n"
      . "</TD></TR>";
  } elseif ($start_msg == $end_msg) {
    /* if there's only one message in the box, handle it differently. */
    if ($sort != 6){
      $i = $start_msg;
    } else {
      $i = 1;
    }
    reset($msort);
    $k = 0;
    do {
      $key = key($msort);
      next($msort);
      $k++;
    } while (isset ($key) && ($k < $i));
    printMessageInfo($imapConnection, $t, $i, $key, $mailbox, $sort, 
		     $real_startMessage, 0, 0);
  } else {
    $i = $start_msg;
    reset($msort);
    $k = 0;
    do {
      $key = key($msort);
      next($msort);
      $k++;
    } while (isset ($key) && ($k < $i));
    do {
      printMessageInfo($imapConnection, $t, $i, $key, $mailbox, 
		       $sort, $real_startMessage, 0, 0);
      $key = key($msort);
      $t++;
      $i++;
      next($msort);
    } while ($i && $i < $endVar);
  }
  
  echo '</table>'
    . "<table bgcolor=\"$color[9]\" width=\"100%\" border=0 cellpadding=1 "
    . "cellspacing=1><tr BGCOLOR=\"$color[4]\"><td>"
    . "<table width=\"100%\" BGCOLOR=\"$color[4]\" border=0 cellpadding=1 "
    . "cellspacing=0><tr><td>$paginator_str</td>"
    . "<td align=right>$msg_cnt_str</td></tr></table>"
    . "</td></tr></table>";
  /* End of message-list table */
  
  do_hook('mailbox_index_after');
  echo "</TABLE></FORM>\n";
}

/*
 * Displays the standard message list header. To finish the table,
 * you need to do a "</table></table>";
 *
 * $moveURL is the URL to submit the delete/move form to
 * $mailbox is the current mailbox
 * $sort is the current sorting method (-1 for no sorting available [searches])
 * $Message is a message that is centered on top of the list
 * $More is a second line that is left aligned
 */
function mail_message_listing_beginning ($imapConnection, $moveURL, 
					 $mailbox = '', $sort = -1,
					 $msg_cnt_str = '', 
					 $paginator = '&nbsp;', 
					 $start_msg = 1) {
  global $color, $index_order, $auto_expunge, $move_to_trash, $base_uri,
    $checkall, $sent_folder, $draft_folder, $thread_sort_messages, 
    $allow_thread_sort, $allow_server_sort, $server_sort_order;
  $urlMailbox = urlencode($mailbox);

  /*
   * This is the beginning of the message list table.
   * It wraps around all messages
   */
  echo "<FORM name=messageList method=post action=\"$moveURL\">\n"
    . "<TABLE WIDTH=\"100%\" BORDER=\"0\" CELLPADDING=\"1\" "
    . "CELLSPACING=\"0\">\n<TR BGCOLOR=\"$color[0]\"><TD>"
    . "    <TABLE BGCOLOR=\"$color[4]\" width=\"100%\" CELLPADDING=\"2\" "
    . "CELLSPACING=\"0\" BORDER=\"0\"><TR>\n"
    . "    <TD ALIGN=LEFT>$paginator\n";

  echo "    <TD ALIGN=RIGHT>$msg_cnt_str</TD>\n"
    . "  </TR></TABLE>\n"
    . '</TD></TR>'
    . "<TR><TD BGCOLOR=\"$color[0]\">\n"
    . "<TABLE BGCOLOR=\"$color[0]\" COLS=2 BORDER=0 cellpadding=0"
    . "cellspacing=0 width=\"100%\">\n"
    . "   <TR>\n"
    . "      <TD ALIGN=LEFT VALIGN=MIDDLE NOWRAP>\n"
    . '         <SMALL>&nbsp;' . _("Move Selected To:") . "</SMALL>\n"
    . "      </TD>\n"
    . "      <TD ALIGN=RIGHT NOWRAP>\n"
    . '         <SMALL>&nbsp;' . _("Transform Selected Messages") 
    . ": &nbsp; </SMALL><BR>\n"
    . "      </TD>\n"
    . "   </TR>\n"
    . "   <TR>\n"
    . "      <TD ALIGN=\"LEFT\" VALIGN=\"MIDDLE\" NOWRAP>\n"
    . '         <SMALL>&nbsp;<TT><SELECT NAME="targetMailbox">';

  $boxes = sqimap_mailbox_list($imapConnection);
  foreach ($boxes as $boxes_part) {
    if (!in_array('noselect', $boxes_part['flags'])) {
      $box = $boxes_part['unformatted'];
      $box2 = str_replace(' ', '&nbsp;', $boxes_part['unformatted-disp']);
      if( $box2 == 'INBOX' ) {
	$box2 = _("INBOX");
      }
      echo "         <OPTION VALUE=\"$box\">$box2</option>\n";
    }
  }
  echo '         </SELECT></TT>&nbsp;'
    . '<INPUT TYPE="SUBMIT" NAME="moveButton" VALUE="' . _("Move") . '">&nbsp;'
    . '<INPUT TYPE="SUBMIT" NAME="attache" VALUE="' . _("Forward") 
    . "\">&nbsp;\n" . "</SMALL>\n";

  echo "      </TD>\n"
    . "      <TD ALIGN=\"RIGHT\" NOWRAP>";
  if (!$auto_expunge) {
    echo '<INPUT TYPE=SUBMIT NAME="expungeButton" VALUE="' . _("Expunge") 
      . '">&nbsp;' . _("mailbox") . '&nbsp;';
  }
  echo '<INPUT TYPE="SUBMIT" NAME="markRead" VALUE="' . _("Read") . '">'
    . '<INPUT TYPE="SUBMIT" NAME="markUnread" VALUE="' . _("Unread") . '">'
    . '<INPUT TYPE="SUBMIT" VALUE="' . _("Delete") . '">&nbsp;'
    . "</TD>\n"
    . "   </TR>\n";

/* draws thread sorting links */
  if ($allow_thread_sort == TRUE) {
    if ($thread_sort_messages == 1 ) {
      $set_thread = 2;
      $thread_name = 'Unthread View';
    } 
	elseif ($thread_sort_messages == 0) {
      $set_thread = 1;
      $thread_name = 'Thread View';
    }
    echo   '<tr><td>&nbsp;<a href=' . "$base_uri" . 'src/right_main.php?sort=' 
      . "$sort" . '&start_messages=1&set_thread=' . "$set_thread"
      . '&mailbox=' . urlencode($mailbox) . '><small>' . _("$thread_name")
      . '</a></small>&nbsp;</td></tr>';
  }

  echo "</TABLE>\n";
  do_hook('mailbox_form_before');
  echo '</TD></TR>'
    . "<TR><TD BGCOLOR=\"$color[0]\">"
    . '<TABLE WIDTH="100%" BORDER=0 CELLPADDING=2 CELLSPACING=';
  if ($GLOBALS['alt_index_colors']){
    echo '0';
  } else { 
    echo '1';
  }
  echo " BGCOLOR=\"$color[0]\">"
    . "<TR BGCOLOR=\"$color[5]\" ALIGN=\"center\">";
  /* if using server sort we highjack the
   * the $sort var and use $server_sort_order
   * instead. but here we reset sort for a bit
   * since its easy
   */
  if ($allow_server_sort == TRUE) {
    $sort = $server_sort_order;
  }
  /* Print the headers. */
  for ($i=1; $i <= count($index_order); $i++) {
    switch ($index_order[$i]) {
    case 1: /* checkbox */
    case 5: /* flags */
      echo '   <TD WIDTH="1%"><B>&nbsp;</B></TD>';
      break;
    case 2: /* from */
      if (handleAsSent($mailbox)) {
	echo '   <TD WIDTH="25%"><B>' . _("To") . '</B>';
      } else {
	echo '   <TD WIDTH="25%"><B>' . _("From") . '</B>';
      }
      if ($thread_sort_messages != 1) {
	ShowSortButton($sort, $mailbox, 2, 3);
      }
      echo "</TD>\n";
      break;
    case 3: /* date */
      echo '   <TD NOWRAP WIDTH="5%"><B>' . _("Date") . '</B>';
      if ($thread_sort_messages != 1) {
	ShowSortButton($sort, $mailbox, 0, 1);
      }
      echo "</TD>\n";
      break;
    case 4: /* subject */
      echo '   <TD><B>' . _("Subject") . '</B> ';
      if ($thread_sort_messages != 1) {
	ShowSortButton($sort, $mailbox, 4, 5);
      }
      echo "</TD>\n";
      break;
    case 6: /* size */
      echo '   <TD WIDTH="5%"><b>' . _("Size") . "</b></TD>\n";
      break;
    }
  }
  /* if using server-sorting,
   * send sort back to 6
   */
  if ($allow_server_sort == TRUE) {
    $sort = 6;
  }
  echo "</TR>\n";
}

/*
 * This function shows the sort button. Isn't this a good comment?
 */
function ShowSortButton($sort, $mailbox, $Up, $Down) {
  /* Figure out which image we want to use. */
  if ($sort != $Up && $sort != $Down) {
    $img = 'sort_none.png';
    $which = $Up;
  } elseif ($sort == $Up) {
    $img = 'up_pointer.png';
    $which = $Down;
  } else {
    $img = 'down_pointer.png';
    $which = 6;
  }
  
  /* Now that we have everything figured out, show the actual button. */
  echo ' <a href="right_main.php?newsort=' . $which
    . '&amp;startMessage=1&amp;mailbox=' . urlencode($mailbox)
    . '"><IMG SRC="../images/' . $img
    . '" BORDER=0 WIDTH=12 HEIGHT=10></a>';
}

function get_selectall_link($start_msg, $sort) {
  global $checkall, $what, $where, $mailbox, $javascript_on;
  global $PHP_SELF, $PG_SHOWNUM;

  $result = '';
  if ($javascript_on) {
    $result =
      '<script language="JavaScript" type="text/javascript">'
      . "\n<!-- \n"
      . "function CheckAll() {\n"
      . "  for (var i = 0; i < document.messageList.elements.length; i++) {\n"
      . "    if(document.messageList.elements[i].type == 'checkbox'){\n"
      . "      document.messageList.elements[i].checked = "
      . "        !(document.messageList.elements[i].checked);\n"
      . "    }\n"
      . "  }\n"
      . "}\n"
      . "//-->\n"
      . '</script><a href="#" onClick="CheckAll();">' . _("Toggle All") 
      . "</a>\n";
  } else {
    if (strpos($PHP_SELF, "?")) {
      $result .= "<a href=\"$PHP_SELF&amp;mailbox=" . urlencode($mailbox)
	. "&amp;startMessage=$start_msg&amp;sort=$sort&amp;checkall=";
    } else {
      $result .= "<a href=\"$PHP_SELF?mailbox=" . urlencode($mailbox)
	. "&amp;startMessage=$start_msg&amp;sort=$sort&amp;checkall=";
    }
    if (isset($checkall) && $checkall == '1') {
      $result .= '0';
    } else {
      $result .= '1';
    }
    
    if (isset($where) && isset($what)) {
      $result .= '&amp;where=' . urlencode($where)
	. '&amp;what=' . urlencode($what);
    }
    
    if ($PG_SHOWNUM == 999999) {
      $result .= '&amp;PG_SHOWNUM=999999';
    }
    
    $result .= "\">";
    
    if (isset($checkall) && ($checkall == '1')) {
      $result .= _("Unselect All");
    } else {
      $result .= _("Select All");
    }
    
    $result .= "</A>\n";
  }

  /* Return our final result. */
  return ($result);
}

/*
 * This function computes the "Viewing Messages..." string.
 */
function get_msgcnt_str($start_msg, $end_msg, $num_msgs) {
  /* Compute the $msg_cnt_str. */
  $result = '';
  if ($start_msg < $end_msg) {
    $result = sprintf(_("Viewing Messages: <B>%s</B> to <B>%s</B> (%s total)"),
		      $start_msg, $end_msg, $num_msgs);
  } else if ($start_msg == $end_msg) {
    $result = sprintf(_("Viewing Message: <B>%s</B> (1 total)"), $start_msg);
  } else {
    $result = '<br>';
  }

  /* Return our result string. */
  return ($result);
}

/*
 * Generate a paginator link.
 */
function get_paginator_link($box, $start_msg, $use, $text) {
  $result = "<A HREF=\"right_main.php?use_mailbox_cache=$use"
    . "&amp;startMessage=$start_msg&amp;mailbox=$box\" "
    . "TARGET=\"right\">$text</A>";
  return ($result);
}

/*
 * This function computes the paginator string.
 */
function get_paginator_str($box, $start_msg, $end_msg, $num_msgs, 
			   $show_num, $sort) {
  global $username, $data_dir, $use_mailbox_cache, $color, $PG_SHOWNUM;

  /* Initialize paginator string chunks. */
  $prv_str = '';
  $nxt_str = '';
  $pg_str = '';
  $all_str = '';
  $tgl_str = '';
  
  /* Create simple strings that will be creating the paginator. */
  $spc = '&nbsp;';     /* This will be used as a space. */
  $sep = '|';          /* This will be used as a seperator. */
  
  /* Get some paginator preference values. */
  $pg_sel = getPref($data_dir, $username, 'page_selector', SMPREF_ON);
  $pg_max = getPref($data_dir, $username, 'page_selector_max', PG_SEL_MAX);
  
  /* Make sure that our start message number is not too big. */
  $start_msg = min($start_msg, $num_msgs);
  
  /* Decide whether or not we will use the mailbox cache. */
  /* Not sure why $use_mailbox_cache is even passed in.   */
  if ($sort == 6) {
    $use = 0;
  } else {
    $use = 1;
  }
  
  /* Compute the starting message of the previous and next page group. */
  $next_grp = $start_msg + $show_num;
  $prev_grp = $start_msg - $show_num;
  
  /* Compute the basic previous and next strings. */
  if (($next_grp <= $num_msgs) && ($prev_grp >= 0)) {
    $prv_str = get_paginator_link($box, $prev_grp, $use, _("Previous"));
    $nxt_str = get_paginator_link($box, $next_grp, $use, _("Next"));
  } else if (($next_grp > $num_msgs) && ($prev_grp >= 0)) {
    $prv_str = get_paginator_link($box, $prev_grp, $use, _("Previous"));
    $nxt_str = "<FONT COLOR=\"$color[9]\">"._("Next")."</FONT>\n";
  } else if (($next_grp <= $num_msgs) && ($prev_grp < 0)) {
    $prv_str = "<FONT COLOR=\"$color[9]\">"._("Previous") . '</FONT>';
    $nxt_str = get_paginator_link($box, $next_grp, $use, _("Next"));
  }
  
  /* Page selector block. Following code computes page links. */
  if ($pg_sel && ($num_msgs > $show_num)) {
    /* Most importantly, what is the current page!!! */
    $cur_pg = intval($start_msg / $show_num) + 1;
    
    /* Compute total # of pages and # of paginator page links. */
      $tot_pgs = ceil($num_msgs / $show_num);  /* Total number of Pages */
      $vis_pgs = min($pg_max, $tot_pgs - 1);   /* Visible Pages    */
	
      /* Compute the size of the four quarters of the page links. */

      /* If we can, just show all the pages. */
      if (($tot_pgs - 1) <= $pg_max) {
	$q1_pgs = $cur_pg - 1;
	$q2_pgs = $q3_pgs = 0;
	$q4_pgs = $tot_pgs - $cur_pg;
	
        /* Otherwise, compute some magic to choose the four quarters. */
      } else {
	/*
	 * Compute the magic base values. Added together,
	 * these values will always equal to the $pag_pgs.
	 * NOTE: These are DEFAULT values and do not take
	 * the current page into account. That is below.
	 */
	$q1_pgs = floor($vis_pgs/4);
	$q2_pgs = round($vis_pgs/4, 0);
	$q3_pgs = ceil($vis_pgs/4);
	$q4_pgs = round(($vis_pgs - $q2_pgs)/3, 0);
        
	/* Adjust if the first quarter contains the current page. */
	if (($cur_pg - $q1_pgs) < 1) {
	  $extra_pgs = ($q1_pgs - ($cur_pg - 1)) + $q2_pgs;
	  $q1_pgs = $cur_pg - 1;
	  $q2_pgs = 0;
	  $q3_pgs += ceil($extra_pgs / 2);
	  $q4_pgs += floor($extra_pgs / 2);
	  
	  /* Adjust if the first and second quarters intersect. */
	} else if (($cur_pg - $q2_pgs - ceil($q2_pgs/3)) <= $q1_pgs) {
	  $extra_pgs = $q2_pgs;
	  $extra_pgs -= ceil(($cur_pg - $q1_pgs - 1) * 0.75);
	  $q2_pgs = ceil(($cur_pg - $q1_pgs - 1) * 0.75);
	  $q3_pgs += ceil($extra_pgs / 2);
	  $q4_pgs += floor($extra_pgs / 2);
	  
	  /* Adjust if the fourth quarter contains the current page. */
	} else if (($cur_pg + $q4_pgs) >= $tot_pgs) {
	  $extra_pgs = ($q4_pgs - ($tot_pgs - $cur_pg)) + $q3_pgs;
	  $q3_pgs = 0;
	  $q4_pgs = $tot_pgs - $cur_pg;
	  $q1_pgs += floor($extra_pgs / 2);
	  $q2_pgs += ceil($extra_pgs / 2);
	  
	  /* Adjust if the third and fourth quarter intersect. */
	} else if (($cur_pg + $q3_pgs + 1) >= ($tot_pgs - $q4_pgs + 1)) {
	  $extra_pgs = $q3_pgs;
	  $extra_pgs -= ceil(($tot_pgs - $cur_pg - $q4_pgs) * 0.75);
	  $q3_pgs = ceil(($tot_pgs - $cur_pg - $q4_pgs) * 0.75);
	  $q1_pgs += floor($extra_pgs / 2);
	  $q2_pgs += ceil($extra_pgs / 2);
	}
      }
      
      /*
       * I am leaving this debug code here, commented out, because
       * it is a really nice way to see what the above code is doing.
       * echo "qts =  $q1_pgs/$q2_pgs/$q3_pgs/$q4_pgs = "
       *    . ($q1_pgs + $q2_pgs + $q3_pgs + $q4_pgs) . '<br>';
       */
      
      /* Print out the page links from the compute page quarters. */
      
      /* Start with the first quarter. */
      if (($q1_pgs == 0) && ($cur_pg > 1)) {
	$pg_str .= "...$spc";
      } else {
	for ($pg = 1; $pg <= $q1_pgs; ++$pg) {
	  $start = (($pg-1) * $show_num) + 1;
	  $pg_str .= get_paginator_link($box, $start, $use, $pg) . $spc;
	}
	if ($cur_pg - $q2_pgs - $q1_pgs > 1) {
	  $pg_str .= "...$spc";
	}
      }
      
      /* Continue with the second quarter. */
      for ($pg = $cur_pg - $q2_pgs; $pg < $cur_pg; ++$pg) {
	$start = (($pg-1) * $show_num) + 1;
	$pg_str .= get_paginator_link($box, $start, $use, $pg) . $spc;
      }
      
      /* Now print the current page. */
      $pg_str .= $cur_pg . $spc;
      
      /* Next comes the third quarter. */
      for ($pg = $cur_pg + 1; $pg <= $cur_pg + $q3_pgs; ++$pg) {
	$start = (($pg-1) * $show_num) + 1;
	$pg_str .= get_paginator_link($box, $start, $use, $pg) . $spc;
      }
      
      /* And last, print the forth quarter page links. */
      if (($q4_pgs == 0) && ($cur_pg < $tot_pgs)) {
	$pg_str .= "...$spc";
      } else {
	if (($tot_pgs - $q4_pgs) > ($cur_pg + $q3_pgs)) {
	  $pg_str .= "...$spc";
	}
	for ($pg = $tot_pgs - $q4_pgs + 1; $pg <= $tot_pgs; ++$pg) {
	  $start = (($pg-1) * $show_num) + 1;
	  $pg_str .= get_paginator_link($box, $start, $use, $pg) . $spc;
	}
      }
  } else if ($PG_SHOWNUM == 999999) {
    $pg_str = "<A HREF=\"right_main.php?use_mailbox_cache=$use"
      . "&amp;startMessage=1&amp;mailbox=$box\" TARGET=\"right\">"
      . _("Paginate") . '</A>' . $spc;
  }

  /* If necessary, compute the 'show all' string. */
  if (($prv_str != '') || ($nxt_str != '')) {
    $all_str = "<A HREF=\"right_main.php?PG_SHOWNUM=999999"
      . "&amp;use_mailbox_cache=$use&amp;startMessage=1&amp;mailbox=$box\" "
      . "TARGET=\"right\">" . _("Show All") . '</A>';
  }
  
  /* Last but not least, get the value for the toggle all link. */
  $tgl_str = get_selectall_link($start_msg, $sort);
  
  /* Put all the pieces of the paginator string together. */
  /**
   * Hairy code... But let's leave it like it is since I am not certain
   * a different approach would be any easier to read. ;)
   */
  $result = '';
  $result .= ($prv_str != '' ? $prv_str . $spc . $sep . $spc : '');
  $result .= ($nxt_str != '' ? $nxt_str . $spc . $sep . $spc : '');
  $result .= ($pg_str != '' ? $pg_str : '');
  $result .= ($all_str != '' ? $sep . $spc . $all_str . $spc : '');
  $result .= ($result != '' ? $sep . $spc . $tgl_str: $tgl_str);
  
  /* If the resulting string is blank, return a non-breaking space. */
  if ($result == '') {
    $result = '&nbsp;';
  }

  /* Return our final magical paginator string. */
  return ($result);
}

function processSubject($subject) {
  /* Shouldn't ever happen -- caught too many times in the IMAP functions */
  if ($subject == '')
    return _("(no subject)");
  
  if (strlen($subject) <= 55)
    return $subject;

  $ent_strlen=strlen($subject);
  $trim_val=50;
  $ent_offset=0;
  /*
   * see if this is entities-encoded string
   * If so, Iterate through the whole string, find out
   * the real number of characters, and if more
   * than 55, substr with an updated trim value.
   */
  while ( (($ent_loc = strpos($subject, '&', $ent_offset)) !== false) &&
	  (($ent_loc_end = strpos($subject, ';', $ent_loc)) !== false) ) {
    $trim_val += ($ent_loc_end-$ent_loc)+1;
    $ent_strlen -= $ent_loc_end-$ent_loc;
    $ent_offset = $ent_loc_end+1;
  }

  if ($ent_strlen <= 55){
    return $subject;
  }
  
  return substr($subject, 0, $trim_val) . '...';
}

function handleAsSent($mailbox) {
  global $sent_folder, $draft_folder, $handleAsSent_result;

  /* First check if this is the sent or draft folder. */
  $handleAsSent_result = (($mailbox == $sent_folder) 
			  || ($mailbox == $draft_folder));
  
  /* Then check the result of the handleAsSent hook. */
  do_hook('check_handleAsSent_result', $mailbox);

  /* And return the result. */
  return ($handleAsSent_result);
}

?>