functions.php

<?php
/**
 * accessiblezen functions and definitions.
 *
 * @package Accessible_Zen
 * @since Accessible Zen 1.0
 */

/**
 * Set the content width based on the theme's design and stylesheet.
 *
 * @since Accessible Zen 1.0
 */
if ( ! isset( $content_width ) )
	$content_width = 768; /* pixels */

if ( ! function_exists( 'accessiblezen_setup' ) ):
/**
 * Sets up theme defaults and registers support for various WordPress features.
 *
 * Note that this function is hooked into the after_setup_theme hook, which runs
 * before the init hook. The init hook is too late for some features, such as indicating
 * support post thumbnails.
 *
 * @since Accessible Zen 1.0
 */
function accessiblezen_setup() {
	/**
	 * Make theme available for translation
	 * Translations can be filed on https://translate.wordpress.org/
	 * If you're building a theme based on Accessible Zen, use a find and replace
	 * to change 'accessible-zen' to the name of your theme in all the template files
	 */
	load_theme_textdomain( 'accessible-zen' );

	// Switches default core markup for search form, comment form, and comments
	// to output valid HTML5.
	add_theme_support( 'html5', array(
		'search-form', 'comment-form', 'comment-list', 'gallery', 'caption'
	) );

	/*
	 * This theme styles the visual editor to resemble the theme style,
	 * specifically font, colors, and column width.
	 */
	add_editor_style( 'css/editor-style.css' );

	/**
	 * Add default posts and comments RSS feed links to head
	 */
	add_theme_support( 'automatic-feed-links' );

	/*
	 * Let WordPress manage the document title.
	 * By adding theme support, we declare that this theme does not use a
	 * hard-coded <title> tag in the document head, and expect WordPress to
	 * provide it for us.
	 */
	add_theme_support( 'title-tag' );

	/** This theme styles the visual editor with editor-style.css to match the theme style. */
	add_editor_style('css/editor-style.css');

	/**
	 * Enable support for Post Thumbnails
	 */
	add_theme_support( 'post-thumbnails' );
	set_post_thumbnail_size( 768, 150, true );

	/**
	 * This theme uses wp_nav_menu() in two locations.
	 */
	register_nav_menus( array(
		'primary' => esc_html__( 'Primary Menu', 'accessible-zen' ),
		'secondary' => esc_html__( 'Secondary Menu', 'accessible-zen' )
	) );

	/*
	 * Add support for all available post formats by default.
	 * See http://codex.wordpress.org/Post_Formats
	 */
	add_theme_support( 'post-formats', array(
		'aside', 'audio', 'chat', 'gallery', 'image', 'link', 'quote', 'status', 'video'
	) );

	/*
	 * This theme supports custom background color and image, and here
	 * we also set up the default background color.
	 */
	add_theme_support( 'custom-background', array(
		'default-color' => '',
	) );
}
endif; // accessiblezen_setup
add_action( 'after_setup_theme', 'accessiblezen_setup' );

/**
 * Register widgetized area and update sidebar with default widgets
 *
 * @since Accessible Zen 1.0
 */
function accessiblezen_widgets_init() {
	register_sidebar( array(
		'name' => esc_html__( 'Footer Widget Area One', 'accessible-zen' ),
		'id' => 'sidebar-1',
		'description'   => esc_html__( 'A widget area for the left side of the footer', 'accessible-zen' ),
		'before_widget' => '<div id="%1$s" class="widget %2$s">',
		'after_widget' => "</div>",
		'before_title' => '<h2 class="widget-title">',
		'after_title' => '</h2>',
	) );

	register_sidebar( array(
		'name' => esc_html__( 'Footer Widget Area Two', 'accessible-zen' ),
		'id' => 'sidebar-2',
		'description'   => esc_html__( 'A widget area for the right side of the footer', 'accessible-zen' ),
		'before_widget' => '<div id="%1$s" class="widget %2$s">',
		'after_widget' => "</div>",
		'before_title' => '<h2 class="widget-title">',
		'after_title' => '</h2>',
	) );
}
add_action( 'widgets_init', 'accessiblezen_widgets_init' );

/**
 * Returns the Google font stylesheet URL, if available.
 *
 * The use of Noticia Text by default is localized. For languages
 * that use characters not supported by the font, the font can be disabled.
 *
 * @since Accessible Zen 1.0
 *
 * @return string Font stylesheet or empty string if disabled.
 */
function accessiblezen_fonts_url() {
	$fonts_url = '';

	/* Translators: If there are characters in your language that are not
	 * supported by Source Sans Pro, translate this to 'off'. Do not translate
	 * into your own language.
	 */
	$merriweather_sans = esc_html_x( 'on', 'Merriweather Sans font: on or off', 'accessible-zen' );

	/* Translators: If there are characters in your language that are not
	 * supported by Bitter, translate this to 'off'. Do not translate into your
	 * own language.
	 */
	$merriweather = esc_html_x( 'on', 'Merriweather font: on or off', 'accessible-zen' );

	if ( 'off' !== $merriweather_sans || 'off' !== $merriweather ) {
		$font_families = array();

		if ( 'off' !== $merriweather_sans )
			$font_families[] = 'Merriweather+Sans:400,700,400italic,700italic';

		if ( 'off' !== $merriweather )
			$font_families[] = 'Merriweather:400,700,400italic,700italic';

		$protocol = is_ssl() ? 'https' : 'http';
		$query_args = array(
			'family' => implode( '|', $font_families ),
			'subset' => 'latin,latin-ext',
		);
		$fonts_url = add_query_arg( $query_args, "$protocol://fonts.googleapis.com/css" );
	}

	return esc_url_raw( $fonts_url );
}

/**
 * Adds additional stylesheets to the TinyMCE editor if needed.
 *
 * @uses accessiblezen_fonts_url() to get the Google Font stylesheet URL.
 *
 * @since Accessible Zen 1.0
 *
 * @param string $mce_css CSS path to load in TinyMCE.
 * @return string The filtered CSS paths list.
 */
function accessiblezen_mce_css( $mce_css ) {
	$fonts_url = accessiblezen_fonts_url();

	if ( empty( $fonts_url ) )
		return $mce_css;

	if ( ! empty( $mce_css ) )
		$mce_css .= ',';

	$mce_css .= esc_url_raw( str_replace( ',', '%2C', $fonts_url ) );

	return $mce_css;
}
add_filter( 'mce_css', 'accessiblezen_mce_css' );

/**
 * Enqueue scripts and styles.
 */
function accessiblezen_scripts_styles() {
	global $wp_styles;

    $fonts_url = accessiblezen_fonts_url();
	if ( ! empty( $fonts_url ) )
		wp_enqueue_style( 'accessiblezen-fonts', esc_url_raw( $fonts_url ), array(), null );

	// Loads the icon fonts stylesheet.
	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '3.2' );

	wp_enqueue_style( 'style', get_stylesheet_uri() );

    wp_enqueue_script( 'skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20130115', true );

	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
		wp_enqueue_script( 'comment-reply' );
	}

	if ( is_singular() && wp_attachment_is_image() ) {
		wp_enqueue_script( 'keyboard-image-navigation', get_template_directory_uri() . '/js/keyboard-image-navigation.js', array( 'jquery' ), '20120202' );
	}
}
add_action( 'wp_enqueue_scripts', 'accessiblezen_scripts_styles' );

/**
 * Implement the Custom Header feature.
 */
require( get_template_directory() . '/inc/custom-header.php' );

/**
 * Custom template tags for this theme.
 */
require( get_template_directory() . '/inc/template-tags.php' );

/**
 * Add custom functions that act independently of the theme templates.
 */
require( get_template_directory() . '/inc/tweaks.php' );

/**
 * Add Customizer additions.
 */
require( get_template_directory() . '/inc/customizer.php' );