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/>.

/**
 * Ilios enrolment plugin settings and presets.
 *
 * @package    enrol_ilios
 * @author     Carson Tam <carson.tam@ucsf.edu>
 * @copyright  2017 The Regents of the University of California
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

if ($ADMIN->fulltree) {

    // General settings.
    $settings->add(new admin_setting_heading('enrol_ilios_settings', '', get_string('pluginname_desc', 'enrol_ilios')));


    // Enrol instance defaults.
    if (!during_initial_install()) {
        // FIX: Change host to host_url (more descriptive).
        $settings->add(
            new admin_setting_configtext(
                'enrol_ilios/host_url',
                get_string('host_url', 'enrol_ilios'),
                get_string('host_url_desc', 'enrol_ilios'),
                'localhost'
            )
        );
        $settings->add(
            new admin_setting_configtext(
                'enrol_ilios/apikey',
                get_string('apikey', 'enrol_ilios'),
                get_string('apikey_desc', 'enrol_ilios'),
                ''
            )
        );

        $options = get_default_enrol_roles(context_system::instance());
        $student = get_archetype_roles('student');
        $student = reset($student);
        $settings->add(
            new admin_setting_configselect(
                'enrol_ilios/roleid',
                get_string('defaultlearnerrole', 'enrol_ilios'),
                '',
                $student->id,
                $options
            )
        );

        $options = [
            ENROL_EXT_REMOVED_UNENROL => get_string('extremovedunenrol', 'enrol'),
            ENROL_EXT_REMOVED_SUSPENDNOROLES => get_string('extremovedsuspendnoroles', 'enrol'),
        ];
        $settings->add(
            new admin_setting_configselect(
                'enrol_ilios/unenrolaction',
                get_string('extremovedaction', 'enrol'),
                get_string('extremovedaction_help', 'enrol'),
                ENROL_EXT_REMOVED_UNENROL,
                $options
            )
        );
    }
}