mirror of
https://github.com/moodle/moodle.git
synced 2025-08-03 16:13:28 +02:00
110 lines
4.5 KiB
PHP
110 lines
4.5 KiB
PHP
<?PHP // $Id$
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// This function fetches math. images from the data directory
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// If not, it obtains the corresponding TeX expression from the cache_tex db table
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// and uses mimeTeX to create the image file
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$nomoodlecookie = true; // Because it interferes with caching
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require_once('../../config.php');
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if (empty($CFG->textfilters)) {
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error ('Filter not enabled!');
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} else {
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$filters = explode(',', $CFG->textfilters);
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if (array_search('filter/algebra', $filters) === FALSE) {
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error ('Filter not enabled!');
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}
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}
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// disable moodle specific debug messages
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disable_debugging();
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require_once($CFG->libdir.'/filelib.php');
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$CFG->texfilterdir = 'filter/tex';
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$CFG->algebrafilterdir = 'filter/algebra';
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$CFG->algebraimagedir = 'filter/algebra';
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$cmd = ''; // Initialise these variables
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$status = '';
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//error_reporting(E_ALL);
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$relativepath = get_file_argument('pix.php');
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$args = explode('/', trim($relativepath, '/'));
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if (count($args) == 1) {
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$image = $args[0];
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$pathname = $CFG->dataroot.'/'.$CFG->algebraimagedir.'/'.$image;
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} else {
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error('No valid arguments supplied');
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}
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if (!file_exists($pathname)) {
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$md5 = str_replace('.gif','',$image);
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if ($texcache = get_record('cache_filters', 'filter', 'algebra', 'md5key', $md5)) {
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if (!file_exists($CFG->dataroot.'/'.$CFG->algebraimagedir)) {
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make_upload_directory($CFG->algebraimagedir);
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}
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$texexp = $texcache->rawtext;
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$texexp = str_replace('<','<',$texexp);
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$texexp = str_replace('>','>',$texexp);
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$texexp = preg_replace('!\r\n?!',' ',$texexp);
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$texexp = '\Large ' . $texexp;
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if ((PHP_OS == "WINNT") || (PHP_OS == "WIN32") || (PHP_OS == "Windows")) {
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$texexp = str_replace('"','\"',$texexp);
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$cmd = "$CFG->dirroot/$CFG->texfilterdir/mimetex.exe";
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$cmd = str_replace(' ','^ ',$cmd);
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$cmd .= " ++ -e \"$pathname\" -- \"$texexp\"";
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} else if (is_executable("$CFG->dirroot/$CFG->texfilterdir/mimetex")) { /// Use the custom binary
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$cmd = "$CFG->dirroot/$CFG->texfilterdir/mimetex -e $pathname -- ". escapeshellarg($texexp);
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} else { /// Auto-detect the right TeX binary
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switch (PHP_OS) {
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case "Linux":
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$cmd = "\"$CFG->dirroot/$CFG->texfilterdir/mimetex.linux\" -e \"$pathname\" -- ". escapeshellarg($texexp);
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break;
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case "Darwin":
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$cmd = "\"$CFG->dirroot/$CFG->texfilterdir/mimetex.darwin\" -e \"$pathname\" -- ". escapeshellarg($texexp);
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break;
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default: /// Nothing was found, so tell them how to fix it.
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if (debugging()) {
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echo "Make sure you have an appropriate MimeTeX binary here:\n\n";
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echo " $CFG->dirroot/$CFG->texfilterdir/mimetex\n\n";
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echo "and that it has the right permissions set on it as executable program.\n\n";
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echo "You can get the latest binaries for your ".PHP_OS." platform from: \n\n";
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echo " http://moodle.org/download/mimetex/";
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} else {
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echo "Mimetex executable was not found,\n";
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echo "Please turn on debug mode in site configuration to see more info here.";
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}
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die;
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break;
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}
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}
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system($cmd, $status);
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}
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}
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if (file_exists($pathname)) {
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send_file($pathname, $image);
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} else {
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if (debugging()) {
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echo "The shell command<br />$cmd<br />returned status = $status<br />\n";
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echo "Image not found!<br />";
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echo "Please try the <a href=\"$CFG->wwwroot/$CFG->algebrafilterdir/algebradebug.php\">debugging script</a>";
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} else {
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echo "Image not found!<br />";
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echo "Please try the <a href=\"$CFG->wwwroot/$CFG->algebrafilterdir/algebradebug.php\">debugging script</a><br />";
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echo "Please turn on debug mode in site configuration to see more info here.";
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}
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}
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?>
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