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Wordpress/wp-content/themes/twentythirteen/functions.php

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<?php
/**
* Twenty Thirteen functions and definitions.
*
* Sets up the theme and provides some helper functions, which are used in the
* theme as custom template tags. Others are attached to action and filter
* hooks in WordPress to change core functionality.
*
* When using a child theme (see http://codex.wordpress.org/Theme_Development
* and http://codex.wordpress.org/Child_Themes), you can override certain
* functions (those wrapped in a function_exists() call) by defining them first
* in your child theme's functions.php file. The child theme's functions.php
* file is included before the parent theme's file, so the child theme
* functions would be used.
*
* Functions that are not pluggable (not wrapped in function_exists()) are
* instead attached to a filter or action hook.
*
* For more information on hooks, actions, and filters,
* see http://codex.wordpress.org/Plugin_API
*
* @package WordPress
* @subpackage Twenty_Thirteen
* @since Twenty Thirteen 1.0
*/
/**
* Sets up the content width value based on the theme's design.
* @see twentythirteen_content_width() for template-specific adjustments.
*/
if ( ! isset( $content_width ) )
$content_width = 604;
/**
* Sets up theme defaults and registers the various WordPress features that
* Twenty Thirteen supports.
*
* @uses load_theme_textdomain() For translation/localization support.
* @uses add_editor_style() To add a Visual Editor stylesheet.
* @uses add_theme_support() To add support for automatic feed links, post
* formats, admin bar, and post thumbnails.
* @uses register_nav_menu() To add support for a navigation menu.
* @uses set_post_thumbnail_size() To set a custom post thumbnail size.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_setup() {
/*
* Makes Twenty Thirteen available for translation.
*
* Translations can be added to the /languages/ directory.
* If you're building a theme based on Twenty Thirteen, use a find and
* replace to change 'twentythirteen' to the name of your theme in all
* template files.
*/
load_theme_textdomain( 'twentythirteen', get_template_directory() . '/languages' );
/*
* This theme styles the visual editor to resemble the theme style,
* specifically font, colors, and column width.
*/
add_editor_style( 'css/editor-style.css' );
// Adds RSS feed links to <head> for posts and comments.
add_theme_support( 'automatic-feed-links' );
/*
* This theme supports all available post formats.
* See http://codex.wordpress.org/Post_Formats
*/
add_theme_support( 'post-formats', array(
'aside', 'audio', 'chat', 'gallery', 'image', 'link', 'quote', 'status', 'video'
) );
/*
* Custom callback to make it easier for our fixed navbar to coexist with
* the WordPress toolbar. See `.wp-toolbar` in style.css.
*
* @see WP_Admin_Bar::initialize()
*/
add_theme_support( 'admin-bar', array(
'callback' => '__return_false'
) );
// This theme uses wp_nav_menu() in one location.
register_nav_menu( 'primary', __( 'Navigation Menu', 'twentythirteen' ) );
/*
* This theme uses a custom image size for featured images, displayed on
* "standard" posts and pages.
*/
add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size( 604, 270, true );
// This theme uses its own gallery styles.
add_filter( 'use_default_gallery_style', '__return_false' );
}
add_action( 'after_setup_theme', 'twentythirteen_setup' );
/**
* Returns the Google font stylesheet URL, if available.
*
* The use of Source Sans Pro and Bitter by default is localized. For languages
* that use characters not supported by the font, the font can be disabled.
*
* @since Twenty Thirteen 1.0
*
* @return string Font stylesheet or empty string if disabled.
*/
function twentythirteen_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.
*/
$source_sans_pro = _x( 'on', 'Source Sans Pro font: on or off', 'twentythirteen' );
/* 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.
*/
$bitter = _x( 'on', 'Bitter font: on or off', 'twentythirteen' );
if ( 'off' !== $source_sans_pro || 'off' !== $bitter ) {
$font_families = array();
if ( 'off' !== $source_sans_pro )
$font_families[] = 'Source+Sans+Pro:400,700,300italic,400italic,700italic';
if ( 'off' !== $bitter )
$font_families[] = 'Bitter:400,700';
$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 $fonts_url;
}
/**
* Loads our special font CSS file.
*
* To disable in a child theme, use wp_dequeue_style()
* function mytheme_dequeue_fonts() {
* wp_dequeue_style( 'twentythirteen-fonts' );
* }
* add_action( 'wp_enqueue_scripts', 'mytheme_dequeue_fonts', 11 );
*
* Also used in the Appearance > Header admin panel:
* @see twentythirteen_custom_header_setup()
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_fonts() {
$fonts_url = twentythirteen_fonts_url();
if ( ! empty( $fonts_url ) )
wp_enqueue_style( 'twentythirteen-fonts', esc_url_raw( $fonts_url ), array(), null );
}
add_action( 'wp_enqueue_scripts', 'twentythirteen_fonts' );
/**
* Adds additional stylesheets to the TinyMCE editor if needed.
*
* @uses twentythirteen_fonts_url() to get the Google Font stylesheet URL.
*
* @since Twenty Thirteen 1.0
*
* @param string $mce_css CSS path to load in TinyMCE.
* @return string
*/
function twentythirteen_mce_css( $mce_css ) {
$fonts_url = twentythirteen_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', 'twentythirteen_mce_css' );
/**
* Enqueues scripts and styles for front end.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_scripts_styles() {
global $wp_styles;
/*
* Adds JavaScript to pages with the comment form to support sites with
* threaded comments (when in use).
*/
if ( is_singular() && comments_open() && get_option( 'thread_comments' ) )
wp_enqueue_script( 'comment-reply' );
// Adds Masonry to handle vertical alignment of footer widgets.
if ( is_active_sidebar( 'sidebar-1' ) )
wp_enqueue_script( 'jquery-masonry' );
// Loads JavaScript file with functionality specific to Twenty Thirteen.
wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '20130211', true );
// Loads our main stylesheet.
wp_enqueue_style( 'twentythirteen-style', get_stylesheet_uri() );
// Loads the Internet Explorer specific stylesheet.
wp_enqueue_style( 'twentythirteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentythirteen-style' ), '20130213' );
$wp_styles->add_data( 'twentythirteen-ie', 'conditional', 'lt IE 9' );
}
add_action( 'wp_enqueue_scripts', 'twentythirteen_scripts_styles' );
/**
* Creates a nicely formatted and more specific title element text for output
* in head of document, based on current view.
*
* @since Twenty Thirteen 1.0
*
* @param string $title Default title text for current view.
* @param string $sep Optional separator.
* @return string Filtered title.
*/
function twentythirteen_wp_title( $title, $sep ) {
global $paged, $page;
if ( is_feed() )
return $title;
// Add the site name.
$title .= get_bloginfo( 'name' );
// Add the site description for the home/front page.
$site_description = get_bloginfo( 'description', 'display' );
if ( $site_description && ( is_home() || is_front_page() ) )
$title = "$title $sep $site_description";
// Add a page number if necessary.
if ( $paged >= 2 || $page >= 2 )
$title = "$title $sep " . sprintf( __( 'Page %s', 'twentythirteen' ), max( $paged, $page ) );
return $title;
}
add_filter( 'wp_title', 'twentythirteen_wp_title', 10, 2 );
/**
* Registers two widget areas.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_widgets_init() {
register_sidebar( array(
'name' => __( 'Main Widget Area', 'twentythirteen' ),
'id' => 'sidebar-1',
'description' => __( 'Appears in the footer section of the site', 'twentythirteen' ),
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
'before_title' => '<h3 class="widget-title">',
'after_title' => '</h3>',
) );
register_sidebar( array(
'name' => __( 'Secondary Widget Area', 'twentythirteen' ),
'id' => 'sidebar-2',
'description' => __( 'Appears on posts and pages in the sidebar.', 'twentythirteen' ),
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
'before_title' => '<h3 class="widget-title">',
'after_title' => '</h3>',
) );
}
add_action( 'widgets_init', 'twentythirteen_widgets_init' );
if ( ! function_exists( 'twentythirteen_paging_nav' ) ) :
/**
* Displays navigation to next/previous set of posts when applicable.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_paging_nav() {
global $wp_query;
// Don't print empty markup if there's only one page.
if ( $wp_query->max_num_pages < 2 && ( is_home() || is_archive() || is_search() ) )
return;
?>
<nav class="navigation paging-navigation" role="navigation">
<h1 class="assistive-text"><?php _e( 'Posts navigation', 'twentythirteen' ); ?></h1>
<div class="nav-links">
<?php if ( get_next_posts_link() ) : ?>
<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts', 'twentythirteen' ) ); ?></div>
<?php endif; ?>
<?php if ( get_previous_posts_link() ) : ?>
<div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>', 'twentythirteen' ) ); ?></div>
<?php endif; ?>
</div><!-- .nav-links -->
</nav><!-- .navigation -->
<?php
}
endif;
if ( ! function_exists( 'twentythirteen_post_nav' ) ) :
/**
* Displays navigation to next/previous post when applicable.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_post_nav() {
global $post;
// Don't print empty markup if there's nowhere to navigate.
$previous = ( is_attachment() ) ? get_post( $post->post_parent ) : get_adjacent_post( false, '', true );
$next = get_adjacent_post( false, '', false );
if ( ! $next && ! $previous )
return;
?>
<nav class="navigation post-navigation" role="navigation">
<h1 class="assistive-text"><?php _e( 'Post navigation', 'twentythirteen' ); ?></h1>
<div class="nav-links">
<?php previous_post_link( '%link', _x( '<span class="meta-nav">&larr;</span> %title', 'Previous post link', 'twentythirteen' ) ); ?>
<?php next_post_link( '%link', _x( '%title <span class="meta-nav">&rarr;</span>', 'Next post link', 'twentythirteen' ) ); ?>
</div><!-- .nav-links -->
</nav><!-- .navigation -->
<?php
}
endif;
if ( ! function_exists( 'twentythirteen_comment' ) ) :
/**
* Template for comments and pingbacks.
*
* To override this walker in a child theme without modifying the comments
* template simply create your own twentythirteen_comment(), and that function
* will be used instead.
*
* Used as a callback by wp_list_comments() for displaying the comments.
*
* @since Twenty Thirteen 1.0
*
* @param object $comment Comment to display.
* @param array $args Optional args.
* @param int $depth Depth of comment.
* @return void
*/
function twentythirteen_comment( $comment, $args, $depth ) {
$GLOBALS['comment'] = $comment;
switch ( $comment->comment_type ) :
case 'pingback' :
case 'trackback' :
// Display trackbacks differently than normal comments.
?>
<li id="comment-<?php comment_ID(); ?>" <?php comment_class(); ?>>
<p><?php _e( 'Pingback:', 'twentythirteen' ); ?> <?php comment_author_link(); ?> <?php edit_comment_link( __( 'Edit', 'twentythirteen' ), '<span class="ping-meta"><span class="edit-link">', '</span></span>' ); ?></p>
<?php
break;
default :
// Proceed with normal comments.
?>
<li id="li-comment-<?php comment_ID(); ?>">
<article id="comment-<?php comment_ID(); ?>" <?php comment_class(); ?>>
<div class="comment-author vcard">
<?php echo get_avatar( $comment, 74 ); ?>
<cite class="fn"><?php comment_author_link(); ?></cite>
</div><!-- .comment-author -->
<header class="comment-meta">
<?php
printf( '<a href="%1$s"><time datetime="%2$s">%3$s</time></a>',
esc_url( get_comment_link( $comment->comment_ID ) ),
get_comment_time( 'c' ),
sprintf( _x( '%1$s at %2$s', '1: date, 2: time', 'twentythirteen' ), get_comment_date(), get_comment_time() )
);
edit_comment_link( __( 'Edit', 'twentythirteen' ), '<span class="edit-link">', '</span>' );
?>
</header><!-- .comment-meta -->
<?php if ( '0' == $comment->comment_approved ) : ?>
<p class="comment-awaiting-moderation"><?php _e( 'Your comment is awaiting moderation.', 'twentythirteen' ); ?></p>
<?php endif; ?>
<div class="comment-content">
<?php comment_text(); ?>
</div><!-- .comment-content -->
<div class="reply">
<?php comment_reply_link( array_merge( $args, array( 'reply_text' => __( 'Reply', 'twentythirteen' ), 'depth' => $depth, 'max_depth' => $args['max_depth'] ) ) ); ?>
</div><!-- .reply -->
</article><!-- #comment-## -->
<?php
break;
endswitch; // End comment_type check.
}
endif;
if ( ! function_exists( 'twentythirteen_entry_meta' ) ) :
/**
* Prints HTML with meta information for current post: categories, tags, permalink, author, and date.
*
* Create your own twentythirteen_entry_meta() to override in a child theme.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_entry_meta() {
if ( is_sticky() && is_home() && ! is_paged() )
echo '<span class="featured-post">' . __( 'Sticky', 'twentythirteen' ) . '</span>';
if ( ! has_post_format( 'aside' ) && ! has_post_format( 'link' ) && 'post' == get_post_type() )
twentythirteen_entry_date();
// Translators: used between list items, there is a space after the comma.
$categories_list = get_the_category_list( __( ', ', 'twentythirteen' ) );
if ( $categories_list ) {
echo '<span class="categories-links">' . $categories_list . '</span>';
}
// Translators: used between list items, there is a space after the comma.
$tag_list = get_the_tag_list( '', __( ', ', 'twentythirteen' ) );
if ( $tag_list ) {
echo '<span class="tags-links">' . $tag_list . '</span>';
}
// Post author
if ( 'post' == get_post_type() ) {
printf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s" rel="author">%3$s</a></span>',
esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
esc_attr( sprintf( __( 'View all posts by %s', 'twentythirteen' ), get_the_author() ) ),
get_the_author()
);
}
}
endif;
if ( ! function_exists( 'twentythirteen_entry_date' ) ) :
/**
* Prints HTML with date information for current post.
*
* Create your own twentythirteen_entry_date() to override in a child theme.
*
* @since Twenty Thirteen 1.0
*
* @param boolean $echo Whether to echo the date. Default true.
* @return string
*/
function twentythirteen_entry_date( $echo = true ) {
$format_prefix = ( has_post_format( 'chat' ) || has_post_format( 'status' ) ) ? _x( '%1$s on %2$s', '1: post format name. 2: date', 'twentythirteen' ): '%2$s';
$date = sprintf( '<span class="date"><a href="%1$s" title="%2$s" rel="bookmark"><time class="entry-date" datetime="%3$s">%4$s</time></a></span>',
esc_url( get_permalink() ),
esc_attr( sprintf( __( 'Permalink to %s', 'twentythirteen' ), the_title_attribute( 'echo=0' ) ) ),
esc_attr( get_the_date( 'c' ) ),
esc_html( sprintf( $format_prefix, get_post_format_string( get_post_format() ), get_the_date() ) )
);
if ( $echo )
echo $date;
return $date;
}
endif;
if ( ! function_exists( 'twentythirteen_get_first_url' ) ) :
/**
* Return the URL for the first link in the post content or the permalink if no
* URL is found.
*
* @since Twenty Thirteen 1.0
* @return string URL
*/
function twentythirteen_get_first_url() {
$has_url = preg_match( '/<a\s[^>]*?href=[\'"](.+?)[\'"]/is', get_the_content(), $match );
$link = ( $has_url ) ? $match[1] : apply_filters( 'the_permalink', get_permalink() );
return esc_url_raw( $link );
}
endif;
if ( ! function_exists( 'twentythirteen_featured_gallery' ) ) :
/**
* Displays first gallery from post content. Changes image size from thumbnail
* to large, to display a larger first image.
*
* @since Twenty Thirteen 1.0
*
* @return void
*/
function twentythirteen_featured_gallery() {
$pattern = get_shortcode_regex();
if ( preg_match( "/$pattern/s", get_the_content(), $match ) ) {
if ( 'gallery' == $match[2] ) {
if ( ! strpos( $match[3], 'size' ) )
$match[3] .= ' size="medium"';
echo do_shortcode_tag( $match );
}
}
}
endif;
/**
* Extends the default WordPress body class to denote:
* 1. Custom fonts enabled.
* 2. Single or multiple authors.
* 3. Active widgets in the sidebar to change the layout and spacing.
*
* @since Twenty Thirteen 1.0
*
* @param array $classes Existing class values.
* @return array Filtered class values.
*/
function twentythirteen_body_class( $classes ) {
// Enable custom font class only if the font CSS is queued to load.
if ( wp_style_is( 'twentythirteen-fonts', 'queue' ) )
$classes[] = 'custom-font';
if ( ! is_multi_author() )
$classes[] = 'single-author';
if ( is_active_sidebar( 'sidebar-2' ) && ! is_attachment() && ! is_404() )
$classes[] = 'sidebar';
return $classes;
}
add_filter( 'body_class', 'twentythirteen_body_class' );
/**
* Extends the default WordPress comment class to add 'no-avatars' class
* if avatars are disabled in discussion settings.
*
* @since Twenty Thirteen 1.0
*
* @param array $classes Existing class values.
* @return array Filtered class values.
*/
function twentythirteen_comment_class( $classes ) {
if ( ! get_option ( 'show_avatars' ) )
$classes[] = 'no-avatars';
return $classes;
}
add_filter( 'comment_class', 'twentythirteen_comment_class' );
/**
* Adjusts content_width value for image post formats, video post formats, and
* image attachment templates.
*
* @since Twenty Thirteen 1.0
*/
function twentythirteen_content_width() {
if ( has_post_format( 'image' ) || has_post_format( 'video' ) || is_attachment() ) {
global $content_width;
$content_width = 724;
}
}
add_action( 'template_redirect', 'twentythirteen_content_width' );
/**
* Adds entry date to aside posts after the content.
*
*
* @since Twenty Thirteen 1.0
*
* @param string $content Post content.
* @return string Post content.
*/
function twentythirteen_aside_date( $content ) {
if ( ! is_feed() && has_post_format( 'aside' ) ) {
$content .= twentythirteen_entry_date( false );
}
return $content;
}
add_filter( 'the_content', 'twentythirteen_aside_date', 8 ); // After embeds, before everything else.
/**
* Usability improvement for better viewing of images on attachment pages.
*
* Moves the focus down to the main content area to by appending an in-page
* anchor to attachment link URLs.
*
* @since Twenty Thirteen 1.0
*
* @param string $url The image attachment URL
* @return string URL with extra anchor appended.
*/
function twentythirteen_attachment_link( $url ) {
if ( wp_attachment_is_image() )
$url .= '#main';
return $url;
}
add_filter( 'attachment_link', 'twentythirteen_attachment_link' );
/**
* Add postMessage support for site title and description for the Customizer.
*
* @since Twenty Thirteen 1.0
*
* @param WP_Customize_Manager $wp_customize Customizer object.
* @return void
*/
function twentythirteen_customize_register( $wp_customize ) {
$wp_customize->get_setting( 'blogname' )->transport = 'postMessage';
$wp_customize->get_setting( 'blogdescription' )->transport = 'postMessage';
$wp_customize->get_setting( 'header_textcolor' )->transport = 'postMessage';
}
add_action( 'customize_register', 'twentythirteen_customize_register' );
/**
* Binds JavaScript handlers to make Customizer preview reload changes
* asynchronously.
*
* @since Twenty Thirteen 1.0
*/
function twentythirteen_customize_preview_js() {
wp_enqueue_script( 'twentythirteen-customizer', get_template_directory_uri() . '/js/theme-customizer.js', array( 'customize-preview' ), '20130226', true );
}
add_action( 'customize_preview_init', 'twentythirteen_customize_preview_js' );
/**
* Adds support for a custom header image.
*/
require( get_template_directory() . '/inc/custom-header.php' );
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