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/wp-content/themes/twentythirteen/ -> functions.php (source)

   1  <?php
   2  /**
   3   * Twenty Thirteen functions and definitions
   4   *
   5   * Sets up the theme and provides some helper functions, which are used in the
   6   * theme as custom template tags. Others are attached to action and filter
   7   * hooks in WordPress to change core functionality.
   8   *
   9   * When using a child theme (see http://codex.wordpress.org/Theme_Development
  10   * and http://codex.wordpress.org/Child_Themes), you can override certain
  11   * functions (those wrapped in a function_exists() call) by defining them first
  12   * in your child theme's functions.php file. The child theme's functions.php
  13   * file is included before the parent theme's file, so the child theme
  14   * functions would be used.
  15   *
  16   * Functions that are not pluggable (not wrapped in function_exists()) are
  17   * instead attached to a filter or action hook.
  18   *
  19   * For more information on hooks, actions, and filters, @link http://codex.wordpress.org/Plugin_API
  20   *
  21   * @package WordPress
  22   * @subpackage Twenty_Thirteen
  23   * @since Twenty Thirteen 1.0
  24   */
  25  
  26  /*
  27   * Set up the content width value based on the theme's design.
  28   *
  29   * @see twentythirteen_content_width() for template-specific adjustments.
  30   */
  31  if ( ! isset( $content_width ) )
  32      $content_width = 604;
  33  
  34  /**
  35   * Add support for a custom header image.
  36   */
  37  require get_template_directory() . '/inc/custom-header.php';
  38  
  39  /**
  40   * Twenty Thirteen only works in WordPress 3.6 or later.
  41   */
  42  if ( version_compare( $GLOBALS['wp_version'], '3.6-alpha', '<' ) )
  43      require get_template_directory() . '/inc/back-compat.php';
  44  
  45  /**
  46   * Twenty Thirteen setup.
  47   *
  48   * Sets up theme defaults and registers the various WordPress features that
  49   * Twenty Thirteen supports.
  50   *
  51   * @uses load_theme_textdomain() For translation/localization support.
  52   * @uses add_editor_style() To add Visual Editor stylesheets.
  53   * @uses add_theme_support() To add support for automatic feed links, post
  54   * formats, and post thumbnails.
  55   * @uses register_nav_menu() To add support for a navigation menu.
  56   * @uses set_post_thumbnail_size() To set a custom post thumbnail size.
  57   *
  58   * @since Twenty Thirteen 1.0
  59   *
  60   * @return void
  61   */
  62  function twentythirteen_setup() {
  63      /*
  64       * Makes Twenty Thirteen available for translation.
  65       *
  66       * Translations can be added to the /languages/ directory.
  67       * If you're building a theme based on Twenty Thirteen, use a find and
  68       * replace to change 'twentythirteen' to the name of your theme in all
  69       * template files.
  70       */
  71      load_theme_textdomain( 'twentythirteen', get_template_directory() . '/languages' );
  72  
  73      /*
  74       * This theme styles the visual editor to resemble the theme style,
  75       * specifically font, colors, icons, and column width.
  76       */
  77      add_editor_style( array( 'css/editor-style.css', 'fonts/genericons.css', twentythirteen_fonts_url() ) );
  78  
  79      // Adds RSS feed links to <head> for posts and comments.
  80      add_theme_support( 'automatic-feed-links' );
  81  
  82      /*
  83       * Switches default core markup for search form, comment form,
  84       * and comments to output valid HTML5.
  85       */
  86      add_theme_support( 'html5', array( 'search-form', 'comment-form', 'comment-list' ) );
  87  
  88      /*
  89       * This theme supports all available post formats by default.
  90       * See http://codex.wordpress.org/Post_Formats
  91       */
  92      add_theme_support( 'post-formats', array(
  93          'aside', 'audio', 'chat', 'gallery', 'image', 'link', 'quote', 'status', 'video'
  94      ) );
  95  
  96      // This theme uses wp_nav_menu() in one location.
  97      register_nav_menu( 'primary', __( 'Navigation Menu', 'twentythirteen' ) );
  98  
  99      /*
 100       * This theme uses a custom image size for featured images, displayed on
 101       * "standard" posts and pages.
 102       */
 103      add_theme_support( 'post-thumbnails' );
 104      set_post_thumbnail_size( 604, 270, true );
 105  
 106      // This theme uses its own gallery styles.
 107      add_filter( 'use_default_gallery_style', '__return_false' );
 108  }
 109  add_action( 'after_setup_theme', 'twentythirteen_setup' );
 110  
 111  /**
 112   * Return the Google font stylesheet URL, if available.
 113   *
 114   * The use of Source Sans Pro and Bitter by default is localized. For languages
 115   * that use characters not supported by the font, the font can be disabled.
 116   *
 117   * @since Twenty Thirteen 1.0
 118   *
 119   * @return string Font stylesheet or empty string if disabled.
 120   */
 121  function twentythirteen_fonts_url() {
 122      $fonts_url = '';
 123  
 124      /* Translators: If there are characters in your language that are not
 125       * supported by Source Sans Pro, translate this to 'off'. Do not translate
 126       * into your own language.
 127       */
 128      $source_sans_pro = _x( 'on', 'Source Sans Pro font: on or off', 'twentythirteen' );
 129  
 130      /* Translators: If there are characters in your language that are not
 131       * supported by Bitter, translate this to 'off'. Do not translate into your
 132       * own language.
 133       */
 134      $bitter = _x( 'on', 'Bitter font: on or off', 'twentythirteen' );
 135  
 136      if ( 'off' !== $source_sans_pro || 'off' !== $bitter ) {
 137          $font_families = array();
 138  
 139          if ( 'off' !== $source_sans_pro )
 140              $font_families[] = 'Source Sans Pro:300,400,700,300italic,400italic,700italic';
 141  
 142          if ( 'off' !== $bitter )
 143              $font_families[] = 'Bitter:400,700';
 144  
 145          $query_args = array(
 146              'family' => urlencode( implode( '|', $font_families ) ),
 147              'subset' => urlencode( 'latin,latin-ext' ),
 148          );
 149          $fonts_url = add_query_arg( $query_args, "//fonts.googleapis.com/css" );
 150      }
 151  
 152      return $fonts_url;
 153  }
 154  
 155  /**
 156   * Enqueue scripts and styles for the front end.
 157   *
 158   * @since Twenty Thirteen 1.0
 159   *
 160   * @return void
 161   */
 162  function twentythirteen_scripts_styles() {
 163      /*
 164       * Adds JavaScript to pages with the comment form to support
 165       * sites with threaded comments (when in use).
 166       */
 167      if ( is_singular() && comments_open() && get_option( 'thread_comments' ) )
 168          wp_enqueue_script( 'comment-reply' );
 169  
 170      // Adds Masonry to handle vertical alignment of footer widgets.
 171      if ( is_active_sidebar( 'sidebar-1' ) )
 172          wp_enqueue_script( 'jquery-masonry' );
 173  
 174      // Loads JavaScript file with functionality specific to Twenty Thirteen.
 175      wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '2013-07-18', true );
 176  
 177      // Add Source Sans Pro and Bitter fonts, used in the main stylesheet.
 178      wp_enqueue_style( 'twentythirteen-fonts', twentythirteen_fonts_url(), array(), null );
 179  
 180      // Add Genericons font, used in the main stylesheet.
 181      wp_enqueue_style( 'genericons', get_template_directory_uri() . '/fonts/genericons.css', array(), '2.09' );
 182  
 183      // Loads our main stylesheet.
 184      wp_enqueue_style( 'twentythirteen-style', get_stylesheet_uri(), array(), '2013-07-18' );
 185  
 186      // Loads the Internet Explorer specific stylesheet.
 187      wp_enqueue_style( 'twentythirteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentythirteen-style' ), '2013-07-18' );
 188      wp_style_add_data( 'twentythirteen-ie', 'conditional', 'lt IE 9' );
 189  }
 190  add_action( 'wp_enqueue_scripts', 'twentythirteen_scripts_styles' );
 191  
 192  /**
 193   * Filter the page title.
 194   *
 195   * Creates a nicely formatted and more specific title element text for output
 196   * in head of document, based on current view.
 197   *
 198   * @since Twenty Thirteen 1.0
 199   *
 200   * @param string $title Default title text for current view.
 201   * @param string $sep   Optional separator.
 202   * @return string The filtered title.
 203   */
 204  function twentythirteen_wp_title( $title, $sep ) {
 205      global $paged, $page;
 206  
 207      if ( is_feed() )
 208          return $title;
 209  
 210      // Add the site name.
 211      $title .= get_bloginfo( 'name' );
 212  
 213      // Add the site description for the home/front page.
 214      $site_description = get_bloginfo( 'description', 'display' );
 215      if ( $site_description && ( is_home() || is_front_page() ) )
 216          $title = "$title $sep $site_description";
 217  
 218      // Add a page number if necessary.
 219      if ( $paged >= 2 || $page >= 2 )
 220          $title = "$title $sep " . sprintf( __( 'Page %s', 'twentythirteen' ), max( $paged, $page ) );
 221  
 222      return $title;
 223  }
 224  add_filter( 'wp_title', 'twentythirteen_wp_title', 10, 2 );
 225  
 226  /**
 227   * Register two widget areas.
 228   *
 229   * @since Twenty Thirteen 1.0
 230   *
 231   * @return void
 232   */
 233  function twentythirteen_widgets_init() {
 234      register_sidebar( array(
 235          'name'          => __( 'Main Widget Area', 'twentythirteen' ),
 236          'id'            => 'sidebar-1',
 237          'description'   => __( 'Appears in the footer section of the site.', 'twentythirteen' ),
 238          'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 239          'after_widget'  => '</aside>',
 240          'before_title'  => '<h3 class="widget-title">',
 241          'after_title'   => '</h3>',
 242      ) );
 243  
 244      register_sidebar( array(
 245          'name'          => __( 'Secondary Widget Area', 'twentythirteen' ),
 246          'id'            => 'sidebar-2',
 247          'description'   => __( 'Appears on posts and pages in the sidebar.', 'twentythirteen' ),
 248          'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 249          'after_widget'  => '</aside>',
 250          'before_title'  => '<h3 class="widget-title">',
 251          'after_title'   => '</h3>',
 252      ) );
 253  }
 254  add_action( 'widgets_init', 'twentythirteen_widgets_init' );
 255  
 256  if ( ! function_exists( 'twentythirteen_paging_nav' ) ) :
 257  /**
 258   * Display navigation to next/previous set of posts when applicable.
 259   *
 260   * @since Twenty Thirteen 1.0
 261   *
 262   * @return void
 263   */
 264  function twentythirteen_paging_nav() {
 265      global $wp_query;
 266  
 267      // Don't print empty markup if there's only one page.
 268      if ( $wp_query->max_num_pages < 2 )
 269          return;
 270      ?>
 271      <nav class="navigation paging-navigation" role="navigation">
 272          <h1 class="screen-reader-text"><?php _e( 'Posts navigation', 'twentythirteen' ); ?></h1>
 273          <div class="nav-links">
 274  
 275              <?php if ( get_next_posts_link() ) : ?>
 276              <div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts', 'twentythirteen' ) ); ?></div>
 277              <?php endif; ?>
 278  
 279              <?php if ( get_previous_posts_link() ) : ?>
 280              <div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>', 'twentythirteen' ) ); ?></div>
 281              <?php endif; ?>
 282  
 283          </div><!-- .nav-links -->
 284      </nav><!-- .navigation -->
 285      <?php
 286  }
 287  endif;
 288  
 289  if ( ! function_exists( 'twentythirteen_post_nav' ) ) :
 290  /**
 291   * Display navigation to next/previous post when applicable.
 292  *
 293  * @since Twenty Thirteen 1.0
 294  *
 295  * @return void
 296  */
 297  function twentythirteen_post_nav() {
 298      global $post;
 299  
 300      // Don't print empty markup if there's nowhere to navigate.
 301      $previous = ( is_attachment() ) ? get_post( $post->post_parent ) : get_adjacent_post( false, '', true );
 302      $next     = get_adjacent_post( false, '', false );
 303  
 304      if ( ! $next && ! $previous )
 305          return;
 306      ?>
 307      <nav class="navigation post-navigation" role="navigation">
 308          <h1 class="screen-reader-text"><?php _e( 'Post navigation', 'twentythirteen' ); ?></h1>
 309          <div class="nav-links">
 310  
 311              <?php previous_post_link( '%link', _x( '<span class="meta-nav">&larr;</span> %title', 'Previous post link', 'twentythirteen' ) ); ?>
 312              <?php next_post_link( '%link', _x( '%title <span class="meta-nav">&rarr;</span>', 'Next post link', 'twentythirteen' ) ); ?>
 313  
 314          </div><!-- .nav-links -->
 315      </nav><!-- .navigation -->
 316      <?php
 317  }
 318  endif;
 319  
 320  if ( ! function_exists( 'twentythirteen_entry_meta' ) ) :
 321  /**
 322   * Print HTML with meta information for current post: categories, tags, permalink, author, and date.
 323   *
 324   * Create your own twentythirteen_entry_meta() to override in a child theme.
 325   *
 326   * @since Twenty Thirteen 1.0
 327   *
 328   * @return void
 329   */
 330  function twentythirteen_entry_meta() {
 331      if ( is_sticky() && is_home() && ! is_paged() )
 332          echo '<span class="featured-post">' . __( 'Sticky', 'twentythirteen' ) . '</span>';
 333  
 334      if ( ! has_post_format( 'link' ) && 'post' == get_post_type() )
 335          twentythirteen_entry_date();
 336  
 337      // Translators: used between list items, there is a space after the comma.
 338      $categories_list = get_the_category_list( __( ', ', 'twentythirteen' ) );
 339      if ( $categories_list ) {
 340          echo '<span class="categories-links">' . $categories_list . '</span>';
 341      }
 342  
 343      // Translators: used between list items, there is a space after the comma.
 344      $tag_list = get_the_tag_list( '', __( ', ', 'twentythirteen' ) );
 345      if ( $tag_list ) {
 346          echo '<span class="tags-links">' . $tag_list . '</span>';
 347      }
 348  
 349      // Post author
 350      if ( 'post' == get_post_type() ) {
 351          printf( '<span class="author vcard"><a class="url fn n" href="%1$s" title="%2$s" rel="author">%3$s</a></span>',
 352              esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
 353              esc_attr( sprintf( __( 'View all posts by %s', 'twentythirteen' ), get_the_author() ) ),
 354              get_the_author()
 355          );
 356      }
 357  }
 358  endif;
 359  
 360  if ( ! function_exists( 'twentythirteen_entry_date' ) ) :
 361  /**
 362   * Print HTML with date information for current post.
 363   *
 364   * Create your own twentythirteen_entry_date() to override in a child theme.
 365   *
 366   * @since Twenty Thirteen 1.0
 367   *
 368   * @param boolean $echo (optional) Whether to echo the date. Default true.
 369   * @return string The HTML-formatted post date.
 370   */
 371  function twentythirteen_entry_date( $echo = true ) {
 372      if ( has_post_format( array( 'chat', 'status' ) ) )
 373          $format_prefix = _x( '%1$s on %2$s', '1: post format name. 2: date', 'twentythirteen' );
 374      else
 375          $format_prefix = '%2$s';
 376  
 377      $date = sprintf( '<span class="date"><a href="%1$s" title="%2$s" rel="bookmark"><time class="entry-date" datetime="%3$s">%4$s</time></a></span>',
 378          esc_url( get_permalink() ),
 379          esc_attr( sprintf( __( 'Permalink to %s', 'twentythirteen' ), the_title_attribute( 'echo=0' ) ) ),
 380          esc_attr( get_the_date( 'c' ) ),
 381          esc_html( sprintf( $format_prefix, get_post_format_string( get_post_format() ), get_the_date() ) )
 382      );
 383  
 384      if ( $echo )
 385          echo $date;
 386  
 387      return $date;
 388  }
 389  endif;
 390  
 391  if ( ! function_exists( 'twentythirteen_the_attached_image' ) ) :
 392  /**
 393   * Print the attached image with a link to the next attached image.
 394   *
 395   * @since Twenty Thirteen 1.0
 396   *
 397   * @return void
 398   */
 399  function twentythirteen_the_attached_image() {
 400      /**
 401       * Filter the image attachment size to use.
 402       *
 403       * @since Twenty thirteen 1.0
 404       *
 405       * @param array $size {
 406       *     @type int The attachment height in pixels.
 407       *     @type int The attachment width in pixels.
 408       * }
 409       */
 410      $attachment_size     = apply_filters( 'twentythirteen_attachment_size', array( 724, 724 ) );
 411      $next_attachment_url = wp_get_attachment_url();
 412      $post                = get_post();
 413  
 414      /*
 415       * Grab the IDs of all the image attachments in a gallery so we can get the URL
 416       * of the next adjacent image in a gallery, or the first image (if we're
 417       * looking at the last image in a gallery), or, in a gallery of one, just the
 418       * link to that image file.
 419       */
 420      $attachment_ids = get_posts( array(
 421          'post_parent'    => $post->post_parent,
 422          'fields'         => 'ids',
 423          'numberposts'    => -1,
 424          'post_status'    => 'inherit',
 425          'post_type'      => 'attachment',
 426          'post_mime_type' => 'image',
 427          'order'          => 'ASC',
 428          'orderby'        => 'menu_order ID'
 429      ) );
 430  
 431      // If there is more than 1 attachment in a gallery...
 432      if ( count( $attachment_ids ) > 1 ) {
 433          foreach ( $attachment_ids as $attachment_id ) {
 434              if ( $attachment_id == $post->ID ) {
 435                  $next_id = current( $attachment_ids );
 436                  break;
 437              }
 438          }
 439  
 440          // get the URL of the next image attachment...
 441          if ( $next_id )
 442              $next_attachment_url = get_attachment_link( $next_id );
 443  
 444          // or get the URL of the first image attachment.
 445          else
 446              $next_attachment_url = get_attachment_link( array_shift( $attachment_ids ) );
 447      }
 448  
 449      printf( '<a href="%1$s" title="%2$s" rel="attachment">%3$s</a>',
 450          esc_url( $next_attachment_url ),
 451          the_title_attribute( array( 'echo' => false ) ),
 452          wp_get_attachment_image( $post->ID, $attachment_size )
 453      );
 454  }
 455  endif;
 456  
 457  /**
 458   * Return the post URL.
 459   *
 460   * @uses get_url_in_content() to get the URL in the post meta (if it exists) or
 461   * the first link found in the post content.
 462   *
 463   * Falls back to the post permalink if no URL is found in the post.
 464   *
 465   * @since Twenty Thirteen 1.0
 466   *
 467   * @return string The Link format URL.
 468   */
 469  function twentythirteen_get_link_url() {
 470      $content = get_the_content();
 471      $has_url = get_url_in_content( $content );
 472  
 473      return ( $has_url ) ? $has_url : apply_filters( 'the_permalink', get_permalink() );
 474  }
 475  
 476  /**
 477   * Extend the default WordPress body classes.
 478   *
 479   * Adds body classes to denote:
 480   * 1. Single or multiple authors.
 481   * 2. Active widgets in the sidebar to change the layout and spacing.
 482   * 3. When avatars are disabled in discussion settings.
 483   *
 484   * @since Twenty Thirteen 1.0
 485   *
 486   * @param array $classes A list of existing body class values.
 487   * @return array The filtered body class list.
 488   */
 489  function twentythirteen_body_class( $classes ) {
 490      if ( ! is_multi_author() )
 491          $classes[] = 'single-author';
 492  
 493      if ( is_active_sidebar( 'sidebar-2' ) && ! is_attachment() && ! is_404() )
 494          $classes[] = 'sidebar';
 495  
 496      if ( ! get_option( 'show_avatars' ) )
 497          $classes[] = 'no-avatars';
 498  
 499      return $classes;
 500  }
 501  add_filter( 'body_class', 'twentythirteen_body_class' );
 502  
 503  /**
 504   * Adjust content_width value for video post formats and attachment templates.
 505   *
 506   * @since Twenty Thirteen 1.0
 507   *
 508   * @return void
 509   */
 510  function twentythirteen_content_width() {
 511      global $content_width;
 512  
 513      if ( is_attachment() )
 514          $content_width = 724;
 515      elseif ( has_post_format( 'audio' ) )
 516          $content_width = 484;
 517  }
 518  add_action( 'template_redirect', 'twentythirteen_content_width' );
 519  
 520  /**
 521   * Add postMessage support for site title and description for the Customizer.
 522   *
 523   * @since Twenty Thirteen 1.0
 524   *
 525   * @param WP_Customize_Manager $wp_customize Customizer object.
 526   * @return void
 527   */
 528  function twentythirteen_customize_register( $wp_customize ) {
 529      $wp_customize->get_setting( 'blogname' )->transport         = 'postMessage';
 530      $wp_customize->get_setting( 'blogdescription' )->transport  = 'postMessage';
 531      $wp_customize->get_setting( 'header_textcolor' )->transport = 'postMessage';
 532  }
 533  add_action( 'customize_register', 'twentythirteen_customize_register' );
 534  
 535  /**
 536   * Enqueue Javascript postMessage handlers for the Customizer.
 537   *
 538   * Binds JavaScript handlers to make the Customizer preview
 539   * reload changes asynchronously.
 540   *
 541   * @since Twenty Thirteen 1.0
 542   *
 543   * @return void
 544   */
 545  function twentythirteen_customize_preview_js() {
 546      wp_enqueue_script( 'twentythirteen-customizer', get_template_directory_uri() . '/js/theme-customizer.js', array( 'customize-preview' ), '20130226', true );
 547  }
 548  add_action( 'customize_preview_init', 'twentythirteen_customize_preview_js' );


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