themes-wordpress/varia/inc/wpcom.php

<?php
/**
 * WordPress.com-specific functions and definitions.
 *
 * This file is centrally included from `wp-content/mu-plugins/wpcom-theme-compat.php`.
 *
 * @package Varia
 */

/**
 * Adds support for wp.com-specific theme functions.
 *
 * @global array $themecolors
 */
function varia_wpcom_setup() {
	global $themecolors;

	// Disable automatically generated color palettes.
	add_theme_support(
		'wpcom-colors',
		array(
			'only-featured-palettes' => true,
		)
	);

	// Set theme colors for third party services.
	if ( ! isset( $themecolors ) ) {
		$themecolors = array(
			'bg'     => 'ffffff',
			'border' => '767676',
			'text'   => '111111',
			'link'   => '0073aa',
			'url'    => '0073aa',
		);
	}
}
add_action( 'after_setup_theme', 'varia_wpcom_setup' );

/**
 * Add setting for hiding page title on the homepage.
 */
function varia_wpcom_customize_update( $wp_customize ) {
	$wp_customize->add_setting(
		'hide_front_page_title',
		array(
			'default'           => false,
			'type'              => 'theme_mod',
			'transport'         => 'postMessage',
			'sanitize_callback' => 'varia_sanitize_checkbox',
		)
	);

	$wp_customize->add_control(
		'hide_front_page_title',
		array(
			'label'       => esc_html__( 'Hide Homepage Title', 'varia' ),
			'description' => esc_html__( 'Check to hide the page title, if your homepage is set to display a static page.', 'varia' ),
			'section'     => 'static_front_page',
			'priority'    => 10,
			'type'        => 'checkbox',
			'settings'    => 'hide_front_page_title',
		)
	);

	$wp_customize->add_setting( 'color_a11y_warning' );
	$wp_customize->add_control(
		'color_a11y_warning',
		array(
			'id'          => 'id',
			'label'       => esc_html__( 'Color Accessibility Warning', 'varia' ),
			'description' => sprintf(
				__( 'In order to ensure people can read your site, try to maintain a strong contrast ratio between the colors you choose here. <a href="%s" target="_blank">Learn more about color contrast</a>.', 'varia' ),
				esc_url( 'https://a11yproject.com/posts/what-is-color-contrast/' )
			),
			'section'     => 'colors_manager_tool',
			'priority'    => 10,
			'type'        => 'hidden',
		)
	);

}
add_action( 'customize_register', 'varia_wpcom_customize_update' );

/**
 * Bind JS handlers to instantly live-preview changes.
 */
function varia_wpcom_customize_preview_js() {
	wp_enqueue_script( 'varia_wpcom_customize_preview', get_theme_file_uri( '/inc/customize-preview-wpcom.js' ), array( 'customize-preview' ), '1.0', true );
}
add_action( 'customize_preview_init', 'varia_wpcom_customize_preview_js' );

/**
 * Enqueue our WP.com styles for front-end.
 * Loads after style.css so we can add overrides.
 */
function varia_wpcom_scripts() {
	wp_enqueue_style( 'varia-wpcom-style', get_template_directory_uri() . '/inc/style-wpcom.css', array( 'varia-style' ), '20181218' );
}
add_action( 'wp_enqueue_scripts', 'varia_wpcom_scripts' );

/**
 * Adds custom classes to the array of body classes.
 *
 * @param array $classes Classes for the body element.
 * @return array
 */
function varia_wpcom_body_classes( $classes ) {

	$hide = get_theme_mod( 'hide_front_page_title', false );

	if ( true === $hide ) {
		$classes[] = 'hide-homepage-title';
	}

	$hide_site_header = get_theme_mod( 'hide_site_header', false );

	if ( true === $hide_site_header ) {
		$classes[] = 'hide-homepage-header';
	}

	$hide_site_footer = get_theme_mod( 'hide_site_footer', false );

	if ( true === $hide_site_footer ) {
		$classes[] = 'hide-homepage-footer';
	}

	$credit_option = get_option( 'footercredit' );

	if ( 'hidden' == $credit_option ) {
		$classes[] = 'hide-footer-credit';
	}

	return $classes;
}
add_filter( 'body_class', 'varia_wpcom_body_classes' );

/**
 * Adds custom classes to the admin body classes.
 *
 * @param string $classes Classes for the body element.
 * @return string
 */
function varia_wpcom_admin_body_classes( $classes ) {
	global $post;
	$is_block_editor_screen = ( function_exists( 'get_current_screen' ) && get_current_screen() && get_current_screen()->is_block_editor() );
	$hide                   = get_theme_mod( 'hide_front_page_title', false );
	$front_page             = (int) get_option( 'page_on_front' );

	if ( $is_block_editor_screen && $front_page === $post->ID && true === $hide ) {
		$classes .= ' hide-homepage-title';
	}

	return $classes;
}
add_filter( 'admin_body_class', 'varia_wpcom_admin_body_classes' );

/**
 * Enqueue our WP.com styles for the block editor.
 */
function varia_wpcom_editor_scripts() {
	wp_enqueue_style( 'varia-wpcom-editor-style', get_template_directory_uri() . '/inc/style-editor-wpcom.css', array(), '20190906' );
}
add_action( 'enqueue_block_editor_assets', 'varia_wpcom_editor_scripts' );

/**
 * Enqueue CSS for customizer a11y warning.
 */
function varia_wpcom_enqueue_message_scripts() {
	wp_enqueue_style( 'varia-customize-message-wpcom-style', get_template_directory_uri() . '/inc/customize-message-wpcom.css', array(), wp_get_theme()->get( 'Version' ) );
}
add_action( 'customize_controls_enqueue_scripts', 'varia_wpcom_enqueue_message_scripts' );