druplastex.module~

<?php

function druplastex_perm() {

return array('access druplastex', 'create druplastex', 'administer druplastex');

}




function druplastex_filter($op, $delta = 0, $format = -1, $text = '') {
 
  switch ($op) {
  case 'list':
    return array(0 => t('Maths rendering filter module'));

  case 'description':
    return t('Allows users to insert Maths easily');

  case 'prepare': 
    return $text;

  case "process":
    $text=_druplastex_process_text($text);
    return $text;

  default:
    return $text;
  }

}

function _druplastex_process_text($text) {
  
  $dir="/www/plus/html/MI/";
  $imgbaseurl="/MI/";

  if (preg_match_all('/\[maths\](.*)\[\/maths\]/sU', $text, $match)) {

    $hits=count($match[0]);
    for ($i=0;$i<$hits;$i++) {
      $tex=$match[1][$i];
      $tex=str_replace('\$','$',$tex);
      $tex=str_replace('&lt;','<',$tex);//fix broken imports
      $tex=str_replace('&gt;','>',$tex);//fix broken imports
      $tex=str_replace('&amp;','&',$tex);//fix broken imports
      $tex ='\documentclass[10pt]{article}\textwidth 6.5in\begin{document}' . $tex . '\end{document}';
      $md5=md5($tex);
      $cachecheck=$dir.$md5.".md5";

      if (!file_exists($cachecheck)) {

	$tmpfname = tempnam("/tmp", "Plus");
	$handle = fopen($tmpfname, "w");
	fwrite($handle, $tex);
	fclose($handle);
	chmod($tmpfname, 0644);
	$cmd = "export PATH=$PATH:/usr/local/bin/; /usr/local/bin/plastex  --dir=".$dir.$md5."/ --image-base-url=".$imgbaseurl.$md5."/  --theme=minimal --no-theme-extras ".$tmpfname." ";
	exec($cmd);
	unlink($tmpfname);
	if (!touch($cachecheck)) {
	  echo "error";
	}
      }
      $replace=file_get_contents($dir.$md5."/index.html");

      $text=str_replace($match[0][$i],$replace,$text);
    }
  }


  return $text;
}