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Edit File: admin.php

<?php //phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
/**
 * Jetpack comments admin menu file.
 *
 * @package automattic/jetpack
 */
/**
 * Class Jetpack_Comments_Settings
 * This class represents the comments settings functionality.
 */
class Jetpack_Comments_Settings {

/** Variables *************************************************************/

/**
	 * The Jetpack Comments singleton
	 *
	 * @var Highlander_Comments_Base
	 */
	public $jetpack_comments;

/**
	 * The default comment form greeting - blank to start with
	 *
	 * @var string
	 */
	public $default_greeting = ''; // Set in constructor.

/**
	 * The default comment form color scheme - an empty array to start with
	 *
	 * @var array
	 */
	public $color_schemes = array();

/**
	 * Initialize class
	 */
	public static function init() {
		static $instance = false;

if ( ! $instance ) {
			$instance = new Jetpack_Comments_Settings( Jetpack_Comments::init() );
		}

return $instance;
	}

/**
	 * Constructor
	 *
	 * @param Highlander_Comments_Base $jetpack_comments The Jetpack Comments singleton.
	 */
	public function __construct( Highlander_Comments_Base $jetpack_comments ) {
		$this->jetpack_comments = $jetpack_comments;

// Setup settings.
		add_action( 'admin_init', array( $this, 'add_settings' ) );
		$this->setup_globals();
	}

/** Private Methods ****************************************************** */

/**
	 * Set any global variables or class variables
	 *
	 * @since 1.4
	 */
	protected function setup_globals() {
		// Default option values.
		$this->default_greeting = __( 'Leave a Reply', 'jetpack' );

// Possible color schemes.
		$this->color_schemes = array(
			'light'       => __( 'Light', 'jetpack' ),
			'dark'        => __( 'Dark', 'jetpack' ),
			'transparent' => __( 'Transparent', 'jetpack' ),
		);
	}

/** Settings ************************************************************* */

/**
	 * Add the Jetpack settings to WordPress's discussions page
	 *
	 * @since 1.4
	 */
	public function add_settings() {

// Create the section.
		add_settings_section(
			'jetpack_comment_form',
			__( 'Comments', 'jetpack' ),
			array( $this, 'comment_form_settings_section' ),
			'discussion'
		);

/**
		 * Clever Greeting
		 */
		add_settings_field(
			'highlander_comment_form_prompt',
			__( 'Greeting Text', 'jetpack' ),
			array( $this, 'comment_form_greeting_setting' ),
			'discussion',
			'jetpack_comment_form'
		);

register_setting(
			'discussion',
			'highlander_comment_form_prompt',
			array( $this, 'comment_form_greeting_sanitize' )
		);

/**
		 * Color Scheme
		 */
		add_settings_field(
			'jetpack_comment_form_color_scheme',
			__( 'Color Scheme', 'jetpack' ),
			array( $this, 'comment_form_color_scheme_setting' ),
			'discussion',
			'jetpack_comment_form'
		);

register_setting(
			'discussion',
			'jetpack_comment_form_color_scheme',
			array( $this, 'comment_form_color_scheme_sanitize' )
		);
	}

/**
	 * Discussions setting section blurb
	 *
	 * @since 1.4
	 */
	public function comment_form_settings_section() {
		?>

<?php
	}

/**
	 * Custom Comment Greeting Text
	 *
	 * @since 1.4
	 */
	public function comment_form_greeting_setting() {

// The greeting.
		$greeting = get_option( 'highlander_comment_form_prompt', $this->default_greeting );
		?>

<input type="text" name="highlander_comment_form_prompt" id="jetpack-comment-form-greeting" value="<?php echo esc_attr( $greeting ); ?>" class="regular-text">
		<p class="description"><?php esc_html_e( 'A few catchy words to motivate your readers to comment', 'jetpack' ); ?></p>

<?php
	}

/**
	 * Sanitize the clever comment greeting
	 *
	 * @since 1.4
	 * @param string $val The contact form greeting string.
	 * @return string
	 */
	public function comment_form_greeting_sanitize( $val ) {

// Delete if empty or the default.
		if ( empty( $val ) || ( $this->default_greeting === $val ) ) {
			delete_option( 'highlander_comment_form_prompt' );
			return false;
		}

return wp_kses( $val, array() );
	}

/**
	 * Comment Form Color Scheme Setting
	 *
	 * @since 1.4
	 */
	public function comment_form_color_scheme_setting() {

// The color scheme.
		$scheme = get_option( 'jetpack_comment_form_color_scheme', $this->jetpack_comments->default_color_scheme );
		?>

<?php foreach ( $this->color_schemes as $key => $label ) : ?>

<?php endforeach; ?>

</fieldset>

<?php
	}

/**
	 * Sanitize the color scheme
	 *
	 * @since 1.4
	 * @param string $val The color scheme string.
	 * @return string
	 */
	public function comment_form_color_scheme_sanitize( $val ) {

// Delete the option if it's unknown, or the default.
		if (
			empty( $val ) || ! array_key_exists( $val, $this->color_schemes )
		||
			$val === $this->jetpack_comments->default_color_scheme
		) {
			delete_option( 'jetpack_comment_form_color_scheme' );
			return false;
		}

return $val;
	}
}

Jetpack_Comments_Settings::init();

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