<?php

/**

 * TwentyTen functions and definitions

 *

 * Sets up the theme and provides some helper functions. Some helper functions

 * are used in the theme as custom template tags. Others are attached to action and

 * filter hooks in WordPress to change core functionality.

 *

 * The first function, twentyten_setup(), sets up the theme by registering support

 * for various features in WordPress, such as post thumbnails, navigation menus, and the like.

 *

 * 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. The hook can be removed by using remove_action() or

 * remove_filter() and you can attach your own function to the hook.

 *

 * We can remove the parent theme's hook only after it is attached, which means we need to

 * wait until setting up the child theme:

 *

 * <code>

 * add_action( 'after_setup_theme', 'my_child_theme_setup' );

 * function my_child_theme_setup() {

 *     // We are providing our own filter for excerpt_length (or using the unfiltered value)

 *     remove_filter( 'excerpt_length', 'twentyten_excerpt_length' );

 *     ...

 * }

 * </code>

 *

 * For more information on hooks, actions, and filters, see http://codex.wordpress.org/Plugin_API.

 *

 * @package WordPress

 * @subpackage Twenty_Ten

 * @since Twenty Ten 1.0

 */

/**

 * Set the content width based on the theme's design and stylesheet.

 *

 * Used to set the width of images and content. Should be equal to the width the theme

 * is designed for, generally via the style.css stylesheet.

 */

if ( ! isset( $content_width ) )

	$content_width = 640;

/** Tell WordPress to run twentyten_setup() when the 'after_setup_theme' hook is run. */

add_action( 'after_setup_theme', 'twentyten_setup' );

if ( ! function_exists( 'twentyten_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.

 *

 * To override twentyten_setup() in a child theme, add your own twentyten_setup to your child theme's

 * functions.php file.

 *

 * @uses add_theme_support() To add support for post thumbnails, custom headers and backgrounds, and automatic feed links.

 * @uses register_nav_menus() To add support for navigation menus.

 * @uses add_editor_style() To style the visual editor.

 * @uses load_theme_textdomain() For translation/localization support.

 * @uses register_default_headers() To register the default custom header images provided with the theme.

 * @uses set_post_thumbnail_size() To set a custom post thumbnail size.

 *

 * @since Twenty Ten 1.0

 */

function twentyten_setup() {

	// This theme styles the visual editor with editor-style.css to match the theme style.

	add_editor_style();

	// Post Format support. You can also use the legacy "gallery" or "asides" (note the plural) categories.

	add_theme_support( 'post-formats', array( 'aside', 'gallery' ) );

	// This theme uses post thumbnails

	add_theme_support( 'post-thumbnails' );

	// Add default posts and comments RSS feed links to head

	add_theme_support( 'automatic-feed-links' );

	// Make theme available for translation

	// Translations can be filed in the /languages/ directory

	load_theme_textdomain( 'twentyten', get_template_directory() . '/languages' );

	// This theme uses wp_nav_menu() in one location.

	register_nav_menus( array(

		'primary' => __( 'Primary Navigation', 'twentyten' ),

	) );

	// This theme allows users to set a custom background.

	add_theme_support( 'custom-background', array(

		// Let WordPress know what our default background color is.

		'default-color' => 'f1f1f1',

	) );

	// The custom header business starts here.

	$custom_header_support = array(

		// The default image to use.

		// The %s is a placeholder for the theme template directory URI.

		'default-image' => '%s/images/headers/path.jpg',

		// The height and width of our custom header.

		'width' => apply_filters( 'twentyten_header_image_width', 940 ),

		'height' => apply_filters( 'twentyten_header_image_height', 198 ),

		// Support flexible heights.

		'flex-height' => true,

		// Don't support text inside the header image.

		'header-text' => false,

		// Callback for styling the header preview in the admin.

		'admin-head-callback' => 'twentyten_admin_header_style',

	);

	add_theme_support( 'custom-header', $custom_header_support );

	if ( ! function_exists( 'get_custom_header' ) ) {

		// This is all for compatibility with versions of WordPress prior to 3.4.

		define( 'HEADER_TEXTCOLOR', '' );

		define( 'NO_HEADER_TEXT', true );

		define( 'HEADER_IMAGE', $custom_header_support['default-image'] );

		define( 'HEADER_IMAGE_WIDTH', $custom_header_support['width'] );

		define( 'HEADER_IMAGE_HEIGHT', $custom_header_support['height'] );

		add_custom_image_header( '', $custom_header_support['admin-head-callback'] );

		add_custom_background();

	}

	// We'll be using post thumbnails for custom header images on posts and pages.

	// We want them to be 940 pixels wide by 198 pixels tall.

	// Larger images will be auto-cropped to fit, smaller ones will be ignored. See header.php.

	set_post_thumbnail_size( $custom_header_support['width'], $custom_header_support['height'], true );

	// ... and thus ends the custom header business.

	// Default custom headers packaged with the theme. %s is a placeholder for the theme template directory URI.

	register_default_headers( array(

		'berries' => array(

			'url' => '%s/images/headers/berries.jpg',

			'thumbnail_url' => '%s/images/headers/berries-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Berries', 'twentyten' )

		),

		'cherryblossom' => array(

			'url' => '%s/images/headers/cherryblossoms.jpg',

			'thumbnail_url' => '%s/images/headers/cherryblossoms-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Cherry Blossoms', 'twentyten' )

		),

		'concave' => array(

			'url' => '%s/images/headers/concave.jpg',

			'thumbnail_url' => '%s/images/headers/concave-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Concave', 'twentyten' )

		),

		'fern' => array(

			'url' => '%s/images/headers/fern.jpg',

			'thumbnail_url' => '%s/images/headers/fern-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Fern', 'twentyten' )

		),

		'forestfloor' => array(

			'url' => '%s/images/headers/forestfloor.jpg',

			'thumbnail_url' => '%s/images/headers/forestfloor-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Forest Floor', 'twentyten' )

		),

		'inkwell' => array(

			'url' => '%s/images/headers/inkwell.jpg',

			'thumbnail_url' => '%s/images/headers/inkwell-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Inkwell', 'twentyten' )

		),

		'path' => array(

			'url' => '%s/images/headers/path.jpg',

			'thumbnail_url' => '%s/images/headers/path-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Path', 'twentyten' )

		),

		'sunset' => array(

			'url' => '%s/images/headers/sunset.jpg',

			'thumbnail_url' => '%s/images/headers/sunset-thumbnail.jpg',

			/* translators: header image description */

			'description' => __( 'Sunset', 'twentyten' )

		)

	) );

}

endif;

if ( ! function_exists( 'twentyten_admin_header_style' ) ) :

/**

 * Styles the header image displayed on the Appearance > Header admin panel.

 *

 * Referenced via add_custom_image_header() in twentyten_setup().

 *

 * @since Twenty Ten 1.0

 */

function twentyten_admin_header_style() {

?>

<style type="text/css">

/* Shows the same border as on front end */

#headimg {

	border-bottom: 1px solid #000;

	border-top: 4px solid #000;

}

/* If header-text was supported, you would style the text with these selectors:

	#headimg #name { }

	#headimg #desc { }

*/

</style>

<?php

}

endif;

/**

 * Get our wp_nav_menu() fallback, wp_page_menu(), to show a home link.

 *

 * To override this in a child theme, remove the filter and optionally add

 * your own function tied to the wp_page_menu_args filter hook.

 *

 * @since Twenty Ten 1.0

 */

function twentyten_page_menu_args( $args ) {

	return $args;

}

add_filter( 'wp_page_menu_args', 'twentyten_page_menu_args' );

/**

 * Sets the post excerpt length to 40 characters.

 *

 * To override this length in a child theme, remove the filter and add your own

 * function tied to the excerpt_length filter hook.

 *

 * @since Twenty Ten 1.0

 * @return int

 */

function twentyten_excerpt_length( $length ) {

	return 40;

}

add_filter( 'excerpt_length', 'twentyten_excerpt_length' );

/**

 * Returns a "Continue Reading" link for excerpts

 *

 * @since Twenty Ten 1.0

 * @return string "Continue Reading" link

 */

function twentyten_continue_reading_link() {

	return ' <a href="'. get_permalink() . '">' . __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'twentyten' ) . '</a>';

}

/**

 * Replaces "[...]" (appended to automatically generated excerpts) with an ellipsis and twentyten_continue_reading_link().

 *

 * To override this in a child theme, remove the filter and add your own

 * function tied to the excerpt_more filter hook.

 *

 * @since Twenty Ten 1.0

 * @return string An ellipsis

 */

function twentyten_auto_excerpt_more( $more ) {

	return ' …' . twentyten_continue_reading_link();

}

add_filter( 'excerpt_more', 'twentyten_auto_excerpt_more' );

/**

 * Adds a pretty "Continue Reading" link to custom post excerpts.

 *

 * To override this link in a child theme, remove the filter and add your own

 * function tied to the get_the_excerpt filter hook.

 *

 * @since Twenty Ten 1.0

 * @return string Excerpt with a pretty "Continue Reading" link

 */

function twentyten_custom_excerpt_more( $output ) {

	if ( has_excerpt() && ! is_attachment() ) {

		$output .= twentyten_continue_reading_link();

	}

	return $output;

}

add_filter( 'get_the_excerpt', 'twentyten_custom_excerpt_more' );

/**

 * Remove inline styles printed when the gallery shortcode is used.

 *

 * Galleries are styled by the theme in Twenty Ten's style.css. This is just

 * a simple filter call that tells WordPress to not use the default styles.

 *

 * @since Twenty Ten 1.2

 */

add_filter( 'use_default_gallery_style', '__return_false' );

/**

 * Deprecated way to remove inline styles printed when the gallery shortcode is used.

 *

 * This function is no longer needed or used. Use the use_default_gallery_style

 * filter instead, as seen above.

 *

 * @since Twenty Ten 1.0

 * @deprecated Deprecated in Twenty Ten 1.2 for WordPress 3.1

 *

 * @return string The gallery style filter, with the styles themselves removed.

 */

function twentyten_remove_gallery_css( $css ) {

	return preg_replace( "#<style type='text/css'>(.*?)</style>#s", '', $css );

}

// Backwards compatibility with WordPress 3.0.

if ( version_compare( $GLOBALS['wp_version'], '3.1', '<' ) )

	add_filter( 'gallery_style', 'twentyten_remove_gallery_css' );

if ( ! function_exists( 'twentyten_comment' ) ) :

/**

 * Template for comments and pingbacks.

 *

 * To override this walker in a child theme without modifying the comments template

 * simply create your own twentyten_comment(), and that function will be used instead.

 *

 * Used as a callback by wp_list_comments() for displaying the comments.

 *

 * @since Twenty Ten 1.0

 */

function twentyten_comment( $comment, $args, $depth ) {

	$GLOBALS['comment'] = $comment;

	switch ( $comment->comment_type ) :

		case '' :

	?>

	<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">

		<div id="comment-<?php comment_ID(); ?>">

	<?php

			break;

		case 'pingback'  :

		case 'trackback' :

	?>

	<li class="post pingback">

		<p><?php _e( 'Pingback:', 'twentyten' ); ?> <?php comment_author_link(); ?><?php edit_comment_link( __( '(Edit)', 'twentyten' ), ' ' ); ?></p>

	<?php

			break;

	endswitch;

}

endif;

/**

 * Register widgetized areas, including two sidebars and four widget-ready columns in the footer.

 *

 * To override twentyten_widgets_init() in a child theme, remove the action hook and add your own

 * function tied to the init hook.

 *

 * @since Twenty Ten 1.0

 * @uses register_sidebar

 */

function twentyten_widgets_init() {

	// Area 1, located at the top of the sidebar.

	register_sidebar( array(

		'name' => __( 'Primary Widget Area', 'twentyten' ),

		'id' => 'primary-widget-area',

		'description' => __( 'The primary widget area', 'twentyten' ),

		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',

		'after_widget' => '</li>',

		'before_title' => '<h3 class="widget-title">',

		'after_title' => '</h3>',

	) );

	// Area 2, located below the Primary Widget Area in the sidebar. Empty by default.

	register_sidebar( array(

		'name' => __( 'Secondary Widget Area', 'twentyten' ),

		'id' => 'secondary-widget-area',

		'description' => __( 'The secondary widget area', 'twentyten' ),

		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',

		'after_widget' => '</li>',

		'before_title' => '<h3 class="widget-title">',

		'after_title' => '</h3>',

	) );

	// Area 3, located in the footer. Empty by default.

	register_sidebar( array(

		'name' => __( 'First Footer Widget Area', 'twentyten' ),

		'id' => 'first-footer-widget-area',

		'description' => __( 'The first footer widget area', 'twentyten' ),

		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',

		'after_widget' => '</li>',

		'before_title' => '<h3 class="widget-title">',

		'after_title' => '</h3>',

	) );

	// Area 4, located in the footer. Empty by default.

	register_sidebar( array(

		'name' => __( 'Second Footer Widget Area', 'twentyten' ),

		'id' => 'second-footer-widget-area',

		'description' => __( 'The second footer widget area', 'twentyten' ),

		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',

		'after_widget' => '</li>',

		'before_title' => '<h3 class="widget-title">',

		'after_title' => '</h3>',

	) );

	// Area 5, located in the footer. Empty by default.

	register_sidebar( array(

		'name' => __( 'Third Footer Widget Area', 'twentyten' ),

		'id' => 'third-footer-widget-area',

		'description' => __( 'The third footer widget area', 'twentyten' ),

		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',

		'after_widget' => '</li>',

		'before_title' => '<h3 class="widget-title">',

		'after_title' => '</h3>',

	) );

	// Area 6, located in the footer. Empty by default.

	register_sidebar( array(

		'name' => __( 'Fourth Footer Widget Area', 'twentyten' ),

		'id' => 'fourth-footer-widget-area',

		'description' => __( 'The fourth footer widget area', 'twentyten' ),

		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',

		'after_widget' => '</li>',