CodemirrorWidget.php

<?php
/**
 * @link https://github.com/borodulin/yii2-codemirror
 * @copyright Copyright (c) 2015 Andrey Borodulin
 * @license https://github.com/borodulin/yii2-codemirror/blob/master/LICENSE.md
 */
namespace conquer\codemirror;

use yii\helpers\Html;
use yii\helpers\ArrayHelper;
use conquer\helpers\Json;

/**
 * @author Andrey Borodulin
 */
class CodemirrorWidget extends \yii\widgets\InputWidget
{

    public $presetsDir;

    public $assets = [];

    public $settings = [];

    /**
     * Preset name. php|javascript etc.
     * @var string
     */
    public $preset;

    /**
     * @inheritdoc
     */
    public function run()
    {
        if ($this->hasModel()) {
            echo Html::activeTextarea($this->model, $this->attribute, $this->options);
        } else {
            echo Html::textarea($this->name, $this->value, $this->options);
        }
        $this->registerAssets();
    }


    /**
     * Registers Assets
     */
    public function registerAssets()
    {
        $view = $this->getView();
        $id = $this->options['id'];
        $settings = $this->settings;
        $assets = $this->assets;
        if ($this->preset) {
            $preset = $this->getPreset($this->preset);
            if (isset($preset['settings'])) {
                $settings = ArrayHelper::merge($preset['settings'], $settings);
            }
            if (isset($preset['assets'])) {
                $assets = ArrayHelper::merge($preset['assets'], $assets);
            }
        }
        $settings = Json::encode($settings);
        $instanceName = 'CM_'.preg_replace('/[^\w\d]/ius', '', $id);
        $js = "CodeMirror.fromTextArea(document.getElementById('$id'), $settings);";
        $view->registerJs($js, $view::POS_READY);
        CodemirrorAsset::register($this->view, $assets);
    }

    public function getPreset($name)
    {
        if ($this->presetsDir) {
            $filename = $this->presetsDir . DIRECTORY_SEPARATOR . ucfirst($name) . 'Preset.php';
        } else {
            $filename = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'presets' . DIRECTORY_SEPARATOR . ucfirst($name) . 'Preset.php';
        }
        return require $filename;
    }
}