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efrain |
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<?php
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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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// disable moodle specific debug messages and any errors in output
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define('NO_DEBUG_DISPLAY', true);
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define('NO_MOODLE_COOKIES', true); // Because it interferes with caching
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require_once('../../config.php');
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if (!filter_is_enabled('algebra')) {
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throw new \moodle_exception('filternotenabled');
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}
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require_once($CFG->libdir.'/filelib.php');
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require_once($CFG->dirroot.'/filter/tex/lib.php');
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$cmd = ''; // Initialise these variables
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$status = '';
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$relativepath = get_file_argument();
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$args = explode('/', trim($relativepath, '/'));
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if (count($args) == 1) {
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$image = $args[0];
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$pathname = $CFG->dataroot.'/filter/algebra/'.$image;
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} else {
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throw new \moodle_exception('invalidarguments', 'error');
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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 = $DB->get_record('cache_filters', array('filter'=>'algebra', 'md5key'=>$md5))) {
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if (!file_exists($CFG->dataroot.'/filter/algebra')) {
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make_upload_directory('filter/algebra');
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}
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$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 ' . $texexp;
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$cmd = filter_tex_get_cmd($pathname, $texexp);
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system($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/filter/algebra/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/filter/algebra/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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