settings.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Auto enrolment plugin settings and presets.
 *
 * @package     enrol_auto
 * @author      Eugene Venter <eugene@catalyst.net.nz>
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

if ($ADMIN->fulltree) {

    require_once($CFG->dirroot.'/enrol/auto/lib.php');

    $settings->add(new admin_setting_heading('enrol_auto_defaults',
        get_string('enrolinstancedefaults', 'admin'), get_string('enrolinstancedefaults_desc', 'admin')));

    $settings->add(new admin_setting_configcheckbox('enrol_auto/defaultenrol',
        get_string('defaultenrol', 'enrol'), get_string('defaultenrol_desc', 'enrol'), 1));

    $options = array(ENROL_INSTANCE_ENABLED  => get_string('yes'),
                     ENROL_INSTANCE_DISABLED => get_string('no'));
    $settings->add(new admin_setting_configselect('enrol_auto/status',
        get_string('status', 'enrol_auto'), get_string('status_desc', 'enrol_auto'), ENROL_INSTANCE_DISABLED, $options));

    $options = array(ENROL_AUTO_COURSE_VIEWED => get_string('courseview', 'enrol_auto'),
                     ENROL_AUTO_LOGIN => get_string('userlogin', 'enrol_auto'),
                     ENROL_AUTO_MOD_VIEWED    => get_string('modview', 'enrol_auto'));
    $settings->add(new admin_setting_configselect('enrol_auto/enrolon',
        get_string('enrolon', 'enrol_auto'), get_string('enrolon_desc', 'enrol_auto'), ENROL_AUTO_COURSE_VIEWED, $options));


    // Clear the observer cache to ensure observers for any newly-installed plugins are added
    if (!empty($PAGE->url) && strstr($PAGE->url, 'section=enrolsettingsauto')) {
        $cache = \cache::make('core', 'observers');
        $cache->delete('all');
    }

    $mods = \enrol_auto\helper::get_mods_with_viewed_event();
    $viewmods = array();
    foreach ($mods as $modname) {
        $viewmods[$modname] = get_string('pluginname', "mod_{$modname}");
    }
    $settings->add(new admin_setting_configmulticheckbox('enrol_auto/modviewmods',
        new lang_string('modviewmods', 'enrol_auto'),
        new lang_string('modviewmods_desc', 'enrol_auto'), array(), $viewmods));

    if (!during_initial_install()) {
        $options = get_default_enrol_roles(context_system::instance());
        $student = get_archetype_roles('student');
        $student = reset($student);
        $settings->add(new admin_setting_configselect('enrol_auto/roleid',
            get_string('defaultrole', 'enrol_auto'), get_string('defaultrole_desc', 'enrol_auto'), $student->id, $options));
    }

    $settings->add(new admin_setting_configcheckbox('enrol_auto/sendcoursewelcomemessage',
        get_string('sendcoursewelcomemessage', 'enrol_auto'), get_string('sendcoursewelcomemessage_help', 'enrol_auto'), 1));
}