/**
 * Update a module.
 *
 * It includes:
 *      - capability and other checks
 *      - update the module
 *
 * @param object $module
 * @return object the updated module info
 * @throws moodle_exception if current user is not allowed to update the module
 */
function update_module($moduleinfo)
{
    global $DB, $CFG;
    require_once $CFG->dirroot . '/course/modlib.php';
    // Check the course module exists.
    $cm = get_coursemodule_from_id('', $moduleinfo->coursemodule, 0, false, MUST_EXIST);
    // Check the course exists.
    $course = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
    // Some checks (capaibility / existing instances).
    list($cm, $context, $module, $data, $cw) = can_update_moduleinfo($cm);
    // Retrieve few information needed by update_moduleinfo.
    $moduleinfo->modulename = $cm->modname;
    if (!isset($moduleinfo->scale)) {
        $moduleinfo->scale = 0;
    }
    $moduleinfo->type = 'mod';
    // Update the module.
    list($cm, $moduleinfo) = update_moduleinfo($cm, $moduleinfo, $course, null);
    return $moduleinfo;
}

} else {
    print_error('noformdesc');
}
$mformclassname = 'mod_' . $module->name . '_mod_form';
$mform = new $mformclassname($data, $cw->section, $cm, $course);
$mform->set_data($data);
if ($mform->is_cancelled()) {
    if ($return && !empty($cm->id)) {
        redirect("{$CFG->wwwroot}/mod/{$module->name}/view.php?id={$cm->id}");
    } else {
        redirect(course_get_url($course, $cw->section, array('sr' => $sectionreturn)));
    }
} else {
    if ($fromform = $mform->get_data()) {
        if (!empty($fromform->update)) {
            list($cm, $fromform) = update_moduleinfo($cm, $fromform, $course, $mform);
        } else {
            if (!empty($fromform->add)) {
                $fromform = add_moduleinfo($fromform, $course, $mform);
            } else {
                print_error('invaliddata');
            }
        }
        if (isset($fromform->submitbutton)) {
            if (empty($fromform->showgradingmanagement)) {
                redirect("{$CFG->wwwroot}/mod/{$module->name}/view.php?id={$fromform->coursemodule}");
            } else {
                $returnurl = new moodle_url("/mod/{$module->name}/view.php", array('id' => $fromform->coursemodule));
                redirect($fromform->gradingman->get_management_url($returnurl));
            }
        } else {