' : print "";
}

/**
 * Add's an entry to the changelog
 *
 * @author Andreas Gohr 
 */
function addLogEntry($date,$id,$summary=""){
  global $conf;
  $id     = cleanID($id);//FIXME not needed anymore?

  if(!@is_writable($conf['changelog'])){
    msg($conf['changelog'].' is not writable!',-1);
    return;
  }

  if(!$date) $date = time(); //use current time if none supplied
  $remote = $_SERVER['REMOTE_ADDR'];
  $user   = $_SERVER['REMOTE_USER'];

  $logline = join("\t",array($date,$remote,$id,$user,$summary))."\n";

  //FIXME: use adjusted io_saveFile instead
  $fh = fopen($conf['changelog'],'a');
  if($fh){
    fwrite($fh,$logline);
    fclose($fh);
  }
}

/**
 * returns an array of recently changed files using the
 * changelog
 *
 * @author Andreas Gohr 
 */
function getRecents($num=0,$incdel=false){
  global $conf;
  $recent = array();
  if(!$num) $num = $conf['recent'];

  if(!@is_readable($conf['changelog'])){
    msg($conf['changelog'].' is not readable',-1);
    return $recent;
  }

  $loglines = file($conf['changelog']);
  rsort($loglines); //reverse sort on timestamp

  foreach ($loglines as $line){
    $line = rtrim($line);        //remove newline
    if(empty($line)) continue;   //skip empty lines
    $info = split("\t",$line);   //split into parts
    //add id if not in yet and file still exists and is allowed to read
    if(!$recent[$info[2]] && 
       (@file_exists(wikiFN($info[2])) || $incdel) &&
       (auth_quickaclcheck($info[2]) >= AUTH_READ)
      ){
      $recent[$info[2]]['date'] = $info[0];
      $recent[$info[2]]['ip']   = $info[1];
      $recent[$info[2]]['user'] = $info[3];
      $recent[$info[2]]['sum']  = $info[4];
      $recent[$info[2]]['del']  = !@file_exists(wikiFN($info[2]));
    }
    if(count($recent) >= $num){
      break; //finish if enough items found
    }
  }
  return $recent;
}

/**
 * gets additonal informations for a certain pagerevison
 * from the changelog
 *
 * @author Andreas Gohr 
 */
function getRevisionInfo($id,$rev){
  global $conf;

  if(!$rev) return(null);

  $info = array();
  if(!@is_readable($conf['changelog'])){
    msg($conf['changelog'].' is not readable',-1);
    return $recent;
  }
  $loglines = file($conf['changelog']);
  $loglines = preg_grep("/$rev\t\d+\.\d+\.\d+\.\d+\t$id\t/",$loglines);
  rsort($loglines); //reverse sort on timestamp (shouldn't be needed)
  $line = split("\t",$loglines[0]);
  $info['date'] = $line[0];
  $info['ip']   = $line[1];
  $info['user'] = $line[3];
  $info['sum']   = $line[4];
  return $info;
}

/**
 * Saves a wikitext by calling io_saveFile
 *
 * @author Andreas Gohr 
 */
function saveWikiText($id,$text,$summary){
  global $conf;
  global $lang;
  umask($conf['umask']);
  // ignore if no changes were made
  if($text == rawWiki($id,'')){
    return;
  }

  $file = wikiFN($id);
  $old  = saveOldRevision($id);

  if (empty($text)){
    // remove empty files
    @unlink($file);
    $del = true;
    //autoset summary on deletion
    if(empty($summary)) $summary = $lang['deleted'];
    //remove empty namespaces
    io_sweepNS($id);
  }else{
    // save file (datadir is created in io_saveFile)
    io_saveFile($file,$text);
    $del = false;
  }

  addLogEntry(@filemtime($file),$id,$summary);
  notify($id,$old,$summary);
  
  //purge cache on add by updating the purgefile
  if($conf['purgeonadd'] && (!$old || $del)){
    io_saveFile($conf['datadir'].'/_cache/purgefile',time());
  }
}

/**
 * moves the current version to the attic and returns its
 * revision date
 *
 * @author Andreas Gohr 
 */
function saveOldRevision($id){
	global $conf;
  umask($conf['umask']);
  $oldf = wikiFN($id);
  if(!@file_exists($oldf)) return '';
  $date = filemtime($oldf);
  $newf = wikiFN($id,$date);
  if(substr($newf,-3)=='.gz'){
    io_saveFile($newf,rawWiki($id));
  }else{
    io_makeFileDir($newf);
    copy($oldf, $newf);
  }
  return $date;
}

/**
 * Sends a notify mail to the wikiadmin when a page was
 * changed
 *
 * @author Andreas Gohr 
 */
function notify($id,$rev="",$summary=""){
  global $lang;
  global $conf;
  $hdrs ='';
  if(empty($conf['notify'])) return; //notify enabled?
  
  $text = rawLocale('mailtext');
  $text = str_replace('@DATE@',date($conf['dformat']),$text);
  $text = str_replace('@BROWSER@',$_SERVER['HTTP_USER_AGENT'],$text);
  $text = str_replace('@IPADDRESS@',$_SERVER['REMOTE_ADDR'],$text);
  $text = str_replace('@HOSTNAME@',gethostbyaddr($_SERVER['REMOTE_ADDR']),$text);
  $text = str_replace('@NEWPAGE@',wl($id,'',true),$text);
  $text = str_replace('@DOKUWIKIURL@',DOKU_URL,$text);
  $text = str_replace('@SUMMARY@',$summary,$text);
  $text = str_replace('@USER@',$_SERVER['REMOTE_USER'],$text);
  
  if($rev){
    $subject = $lang['mail_changed'].' '.$id;
    $text = str_replace('@OLDPAGE@',wl($id,"rev=$rev",true),$text);
    require_once("inc/DifferenceEngine.php");
    $df  = new Diff(split("\n",rawWiki($id,$rev)),
                    split("\n",rawWiki($id)));
    $dformat = new UnifiedDiffFormatter();
    $diff    = $dformat->format($df);
  }else{
    $subject=$lang['mail_newpage'].' '.$id;
    $text = str_replace('@OLDPAGE@','none',$text);
    $diff = rawWiki($id);
  }
  $text = str_replace('@DIFF@',$diff,$text);

  mail_send($conf['notify'],$subject,$text,$conf['mailfrom']);
}

/**
 * Return a list of available page revisons
 *
 * @author Andreas Gohr 
 */
function getRevisions($id){
  $revd = dirname(wikiFN($id,'foo'));
  $revs = array();
  $clid = cleanID($id);
  if(strrpos($clid,':')) $clid = substr($clid,strrpos($clid,':')+1); //remove path

  if (is_dir($revd) && $dh = opendir($revd)) {
    while (($file = readdir($dh)) !== false) {
      if (is_dir($revd.'/'.$file)) continue;
      if (preg_match('/^'.$clid.'\.(\d+)\.txt(\.gz)?$/',$file,$match)){
        $revs[]=$match[1];
      }
    }
    closedir($dh);
  }
  rsort($revs);
  return $revs;
}

/**
 * extracts the query from a google referer
 *
 * @todo   should be more generic and support yahoo et al
 * @author Andreas Gohr 
 */
function getGoogleQuery(){
  $url = parse_url($_SERVER['HTTP_REFERER']);

  if(!preg_match("#google\.#i",$url['host'])) return '';
  $query = array();
  parse_str($url['query'],$query);

  return $query['q'];
}

/**
 * Try to set correct locale
 *
 * @deprecated No longer used
 * @author     Andreas Gohr 
 */
function setCorrectLocale(){
  global $conf;
  global $lang;

  $enc = strtoupper($lang['encoding']);
  foreach ($lang['locales'] as $loc){
    //try locale
    if(@setlocale(LC_ALL,$loc)) return;
    //try loceale with encoding
    if(@setlocale(LC_ALL,"$loc.$enc")) return;
  }
  //still here? try to set from environment
  @setlocale(LC_ALL,"");
}

/**
 * Return the human readable size of a file
 *
 * @param       int    $size   A file size
 * @param       int    $dec    A number of decimal places
 * @author      Martin Benjamin 
 * @author      Aidan Lister 
 * @version     1.0.0
 */
function filesize_h($size, $dec = 1){
  $sizes = array('B', 'KB', 'MB', 'GB');
  $count = count($sizes);
  $i = 0;
    
  while ($size >= 1024 && ($i < $count - 1)) {
    $size /= 1024;
    $i++;
  }

  return round($size, $dec) . ' ' . $sizes[$i];
}

/**
 * Run a few sanity checks
 *
 * @author Andreas Gohr 
 */
function getVersion(){
  //import version string
  if(@file_exists('VERSION')){
    //official release
    return 'Release '.io_readfile('VERSION');
  }elseif(is_dir('_darcs')){
    //darcs checkout
    $inv = file('_darcs/inventory');
    $inv = preg_grep('#andi@splitbrain\.org\*\*\d{14}#',$inv);
    $cur = array_pop($inv);
    preg_match('#\*\*(\d{4})(\d{2})(\d{2})#',$cur,$matches);
    return 'Darcs '.$matches[1].'-'.$matches[2].'-'.$matches[3];
  }else{
    return 'snapshot?';
  }
}

/**
 * Run a few sanity checks
 *
 * @author Andreas Gohr 
 */
function check(){
  global $conf;
  global $INFO;

  msg('DokuWiki version: '.getVersion(),1);

  if(version_compare(phpversion(),'4.3.0','<')){
    msg('Your PHP version is too old ('.phpversion().' vs. 4.3.+ recommended)',-1);
  }elseif(version_compare(phpversion(),'4.3.10','<')){
    msg('Consider upgrading PHP to 4.3.10 or higher for security reasons (your version: '.phpversion().')',0);
  }else{
    msg('PHP version '.phpversion(),1);
  }

  if(is_writable($conf['changelog'])){
    msg('Changelog is writable',1);
  }else{
    msg('Changelog is not writable',-1);
  }

  if(is_writable($conf['datadir'])){
    msg('Datadir is writable',1);
  }else{
    msg('Datadir is not writable',-1);
  }

  if(is_writable($conf['olddir'])){
    msg('Attic is writable',1);
  }else{
    msg('Attic is not writable',-1);
  }

  if(is_writable($conf['mediadir'])){
    msg('Mediadir is writable',1);
  }else{
    msg('Mediadir is not writable',-1);
  }

  if(is_writable('conf/users.auth')){
    msg('conf/users.auth is writable',1);
  }else{
    msg('conf/users.auth is not writable',0);
  }

  if(function_exists('mb_strpos')){
    if(defined('UTF8_NOMBSTRING')){
      msg('mb_string extension is available but will not be used',0);
    }else{
      msg('mb_string extension is available and will be used',1);
    }
  }else{
    msg('mb_string extension not available - PHP only replacements will be used',0);
  }
 
  msg('Your current permission for this page is '.$INFO['perm'],0);

  if(is_writable($INFO['filepath'])){
    msg('The current page is writable by the webserver',0);
  }else{
    msg('The current page is not writable by the webserver',0);
  }

  if($INFO['writable']){
    msg('The current page is writable by you',0);
  }else{
    msg('The current page is not writable you',0);
  }
}


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