WordPress/wp-includes/post-template.php

<?php
/**
 * WordPress Post Template Functions.
 *
 * Gets content for the current post in the loop.
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * Display the ID of the current item in the WordPress Loop.
 *
 * @since 0.71
 */
function the_ID() {
	echo get_the_ID();
}

/**
 * Retrieve the ID of the current item in the WordPress Loop.
 *
 * @since 2.1.0
 * @uses $post
 *
 * @return int
 */
function get_the_ID() {
	return get_post()->ID;
}

/**
 * Display or retrieve the current post title with optional content.
 *
 * @since 0.71
 *
 * @param string $before Optional. Content to prepend to the title.
 * @param string $after Optional. Content to append to the title.
 * @param bool $echo Optional, default to true.Whether to display or return.
 * @return null|string Null on no title. String if $echo parameter is false.
 */
function the_title($before = '', $after = '', $echo = true) {
	$title = get_the_title();

	if ( strlen($title) == 0 )
		return;

	$title = $before . $title . $after;

	if ( $echo )
		echo $title;
	else
		return $title;
}

/**
 * Sanitize the current title when retrieving or displaying.
 *
 * Works like {@link the_title()}, except the parameters can be in a string or
 * an array. See the function for what can be override in the $args parameter.
 *
 * The title before it is displayed will have the tags stripped and {@link
 * esc_attr()} before it is passed to the user or displayed. The default
 * as with {@link the_title()}, is to display the title.
 *
 * @since 2.3.0
 *
 * @param string|array $args Optional. Override the defaults.
 * @return string|null Null on failure or display. String when echo is false.
 */
function the_title_attribute( $args = '' ) {
	$defaults = array('before' => '', 'after' =>  '', 'echo' => true, 'post' => get_post() );
	$r = wp_parse_args($args, $defaults);
	extract( $r, EXTR_SKIP );

	$title = get_the_title( $post );

	if ( strlen($title) == 0 )
		return;

	$title = $before . $title . $after;
	$title = esc_attr(strip_tags($title));

	if ( $echo )
		echo $title;
	else
		return $title;
}

/**
 * Retrieve post title.
 *
 * If the post is protected and the visitor is not an admin, then "Protected"
 * will be displayed before the post title. If the post is private, then
 * "Private" will be located before the post title.
 *
 * @since 0.71
 *
 * @param int|WP_Post $post Optional. Post ID or post object.
 * @return string
 */
function get_the_title( $post = 0 ) {
	$post = get_post( $post );

	$title = isset( $post->post_title ) ? $post->post_title : '';
	$id = isset( $post->ID ) ? $post->ID : 0;

	if ( ! is_admin() ) {
		if ( ! empty( $post->post_password ) ) {

			/**
			 * Filter the text prepended to the post title for protected posts.
			 *
			 * The filter is only applied on the front end.
			 *
			 * @since 2.8.0
			 *
			 * @param string $prepend Text displayed before the post title.
			 *                        Default 'Protected: %s'.
			 */
			$protected_title_format = apply_filters( 'protected_title_format', __( 'Protected: %s' ) );
			$title = sprintf( $protected_title_format, $title );
		} else if ( isset( $post->post_status ) && 'private' == $post->post_status ) {

			/**
			 * Filter the text prepended to the post title of private posts.
			 *
			 * The filter is only applied on the front end.
			 *
			 * @since 2.8.0
			 *
			 * @param string $prepend Text displayed before the post title.
			 *                        Default 'Private: %s'.
			 */
			$private_title_format = apply_filters( 'private_title_format', __( 'Private: %s' ) );
			$title = sprintf( $private_title_format, $title );
		}
	}

	/**
	 * Filter the post title.
	 *
	 * @since 0.71
	 *
	 * @param string $title The post title.
	 * @param int    $id    The post ID.
	 */
	return apply_filters( 'the_title', $title, $id );
}

/**
 * Display the Post Global Unique Identifier (guid).
 *
 * The guid will appear to be a link, but should not be used as an link to the
 * post. The reason you should not use it as a link, is because of moving the
 * blog across domains.
 *
 * Url is escaped to make it xml safe
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $id Optional. Post ID or post object.
 */
function the_guid( $id = 0 ) {
	echo esc_url( get_the_guid( $id ) );
}

/**
 * Retrieve the Post Global Unique Identifier (guid).
 *
 * The guid will appear to be a link, but should not be used as an link to the
 * post. The reason you should not use it as a link, is because of moving the
 * blog across domains.
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $id Optional. Post ID or post object.
 * @return string
 */
function get_the_guid( $id = 0 ) {
	$post = get_post($id);

	/**
	 * Filter the Global Unique Identifier (guid) of the post.
	 *
	 * @since 1.5.0
	 *
	 * @param string $post_guid Global Unique Identifier (guid) of the post.
	 */
	return apply_filters( 'get_the_guid', $post->guid );
}

/**
 * Display the post content.
 *
 * @since 0.71
 *
 * @param string $more_link_text Optional. Content for when there is more text.
 * @param bool $strip_teaser Optional. Strip teaser content before the more text. Default is false.
 */
function the_content( $more_link_text = null, $strip_teaser = false) {
	$content = get_the_content( $more_link_text, $strip_teaser );

	/**
	 * Filter the post content.
	 *
	 * @since 0.71
	 *
	 * @param string $content Content of the current post.
	 */
	$content = apply_filters( 'the_content', $content );
	$content = str_replace( ']]>', ']]&gt;', $content );
	echo $content;
}

/**
 * Retrieve the post content.
 *
 * @since 0.71
 *
 * @param string $more_link_text Optional. Content for when there is more text.
 * @param bool $stripteaser Optional. Strip teaser content before the more text. Default is false.
 * @return string
 */
function get_the_content( $more_link_text = null, $strip_teaser = false ) {
	global $page, $more, $preview, $pages, $multipage;

	$post = get_post();

	if ( null === $more_link_text )
		$more_link_text = __( '(more&hellip;)' );

	$output = '';
	$has_teaser = false;

	// If post password required and it doesn't match the cookie.
	if ( post_password_required( $post ) )
		return get_the_password_form( $post );

	if ( $page > count( $pages ) ) // if the requested page doesn't exist
		$page = count( $pages ); // give them the highest numbered page that DOES exist

	$content = $pages[$page - 1];
	if ( preg_match( '/<!--more(.*?)?-->/', $content, $matches ) ) {
		$content = explode( $matches[0], $content, 2 );
		if ( ! empty( $matches[1] ) && ! empty( $more_link_text ) )
			$more_link_text = strip_tags( wp_kses_no_null( trim( $matches[1] ) ) );

		$has_teaser = true;
	} else {
		$content = array( $content );
	}

	if ( false !== strpos( $post->post_content, '<!--noteaser-->' ) && ( ! $multipage || $page == 1 ) )
		$strip_teaser = true;

	$teaser = $content[0];

	if ( $more && $strip_teaser && $has_teaser )
		$teaser = '';

	$output .= $teaser;

	if ( count( $content ) > 1 ) {
		if ( $more ) {
			$output .= '<span id="more-' . $post->ID . '"></span>' . $content[1];
		} else {
			if ( ! empty( $more_link_text ) )

				/**
				 * Filter the Read More link text.
				 *
				 * @since 2.8.0
				 *
				 * @param string $more_link_element Read More link element.
				 * @param string $more_link_text    Read More text.
				 */
				$output .= apply_filters( 'the_content_more_link', ' <a href="' . get_permalink() . "#more-{$post->ID}\" class=\"more-link\">$more_link_text</a>", $more_link_text );
			$output = force_balance_tags( $output );
		}
	}

	if ( $preview ) // preview fix for javascript bug with foreign languages
		$output =	preg_replace_callback( '/\%u([0-9A-F]{4})/', '_convert_urlencoded_to_entities', $output );

	return $output;
}

/**
 * Preview fix for javascript bug with foreign languages
 *
 * @since 3.1.0
 * @access private
 * @param array $match Match array from preg_replace_callback
 * @return string
 */
function _convert_urlencoded_to_entities( $match ) {
	return '&#' . base_convert( $match[1], 16, 10 ) . ';';
}

/**
 * Display the post excerpt.
 *
 * @since 0.71
 */
function the_excerpt() {

	/**
	 * Filter the displayed post excerpt.
	 *
	 * @since 0.71
	 *
	 * @see get_the_excerpt()
	 *
	 * @param string $post_excerpt The post excerpt.
	 */
	echo apply_filters( 'the_excerpt', get_the_excerpt() );
}

/**
 * Retrieve the post excerpt.
 *
 * @since 0.71
 *
 * @param mixed $deprecated Not used.
 * @return string
 */
function get_the_excerpt( $deprecated = '' ) {
	if ( !empty( $deprecated ) )
		_deprecated_argument( __FUNCTION__, '2.3' );

	$post = get_post();

	if ( post_password_required() ) {
		return __( 'There is no excerpt because this is a protected post.' );
	}

	/**
	 * Filter the retrieved post excerpt.
	 *
	 * @since 1.2.0
	 *
	 * @param string $post_excerpt The post excerpt.
	 */
	return apply_filters( 'get_the_excerpt', $post->post_excerpt );
}

/**
 * Whether post has excerpt.
 *
 * @since 2.3.0
 *
 * @param int|WP_Post $id Optional. Post ID or post object.
 * @return bool
 */
function has_excerpt( $id = 0 ) {
	$post = get_post( $id );
	return ( !empty( $post->post_excerpt ) );
}

/**
 * Display the classes for the post div.
 *
 * @since 2.7.0
 *
 * @param string|array $class One or more classes to add to the class list.
 * @param int|WP_Post $post_id Optional. Post ID or post object.
 */
function post_class( $class = '', $post_id = null ) {
	// Separates classes with a single space, collates classes for post DIV
	echo 'class="' . join( ' ', get_post_class( $class, $post_id ) ) . '"';
}

/**
 * Retrieve the classes for the post div as an array.
 *
 * The class names are many. If the post is a sticky, then the 'sticky'
 * class name. The class 'hentry' is always added to each post. If the post has a
 * post thumbnail, 'has-post-thumbnail' is added as a class. For each
 * category, the class will be added with 'category-' with category slug is
 * added. The tags are the same way as the categories with 'tag-' before the tag
 * slug. All classes are passed through the filter, 'post_class' with the list
 * of classes, followed by $class parameter value, with the post ID as the last
 * parameter.
 *
 * @since 2.7.0
 *
 * @param string|array $class One or more classes to add to the class list.
 * @param int|WP_Post $post_id Optional. Post ID or post object.
 * @return array Array of classes.
 */
function get_post_class( $class = '', $post_id = null ) {
	$post = get_post($post_id);

	$classes = array();

	if ( empty($post) )
		return $classes;

	$classes[] = 'post-' . $post->ID;
	if ( ! is_admin() )
		$classes[] = $post->post_type;
	$classes[] = 'type-' . $post->post_type;
	$classes[] = 'status-' . $post->post_status;

	// Post Format
	if ( post_type_supports( $post->post_type, 'post-formats' ) ) {
		$post_format = get_post_format( $post->ID );

		if ( $post_format && !is_wp_error($post_format) )
			$classes[] = 'format-' . sanitize_html_class( $post_format );
		else
			$classes[] = 'format-standard';
	}

	// Post requires password
	if ( post_password_required( $post->ID ) ) {
		$classes[] = 'post-password-required';
	// Post thumbnails
	} elseif ( ! is_attachment( $post ) && current_theme_supports( 'post-thumbnails' ) && has_post_thumbnail( $post->ID ) ) {
		$classes[] = 'has-post-thumbnail';
	}

	// sticky for Sticky Posts
	if ( is_sticky($post->ID) && is_home() && !is_paged() )
		$classes[] = 'sticky';

	// hentry for hAtom compliance
	$classes[] = 'hentry';

	// Categories
	if ( is_object_in_taxonomy( $post->post_type, 'category' ) ) {
		foreach ( (array) get_the_category($post->ID) as $cat ) {
			if ( empty($cat->slug ) )
				continue;
			$classes[] = 'category-' . sanitize_html_class($cat->slug, $cat->term_id);
		}
	}

	// Tags
	if ( is_object_in_taxonomy( $post->post_type, 'post_tag' ) ) {
		foreach ( (array) get_the_tags($post->ID) as $tag ) {
			if ( empty($tag->slug ) )
				continue;
			$classes[] = 'tag-' . sanitize_html_class($tag->slug, $tag->term_id);
		}
	}

	if ( !empty($class) ) {
		if ( !is_array( $class ) )
			$class = preg_split('#\s+#', $class);
		$classes = array_merge($classes, $class);
	}

	$classes = array_map('esc_attr', $classes);

	/**
	 * Filter the list of CSS classes for the current post.
	 *
	 * @since 2.7.0
	 *
	 * @param array  $classes An array of post classes.
	 * @param string $class   A comma-separated list of additional classes added to the post.
	 * @param int    $post_id The post ID.
	 */
	return apply_filters( 'post_class', $classes, $class, $post->ID );
}

/**
 * Display the classes for the body element.
 *
 * @since 2.8.0
 *
 * @param string|array $class One or more classes to add to the class list.
 */
function body_class( $class = '' ) {
	// Separates classes with a single space, collates classes for body element
	echo 'class="' . join( ' ', get_body_class( $class ) ) . '"';
}

/**
 * Retrieve the classes for the body element as an array.
 *
 * @since 2.8.0
 *
 * @param string|array $class One or more classes to add to the class list.
 * @return array Array of classes.
 */
function get_body_class( $class = '' ) {
	global $wp_query, $wpdb;

	$classes = array();

	if ( is_rtl() )
		$classes[] = 'rtl';

	if ( is_front_page() )
		$classes[] = 'home';
	if ( is_home() )
		$classes[] = 'blog';
	if ( is_archive() )
		$classes[] = 'archive';
	if ( is_date() )
		$classes[] = 'date';
	if ( is_search() ) {
		$classes[] = 'search';
		$classes[] = $wp_query->posts ? 'search-results' : 'search-no-results';
	}
	if ( is_paged() )
		$classes[] = 'paged';
	if ( is_attachment() )
		$classes[] = 'attachment';
	if ( is_404() )
		$classes[] = 'error404';

	if ( is_single() ) {
		$post_id = $wp_query->get_queried_object_id();
		$post = $wp_query->get_queried_object();

		$classes[] = 'single';
		if ( isset( $post->post_type ) ) {
			$classes[] = 'single-' . sanitize_html_class($post->post_type, $post_id);
			$classes[] = 'postid-' . $post_id;

			// Post Format
			if ( post_type_supports( $post->post_type, 'post-formats' ) ) {
				$post_format = get_post_format( $post->ID );

				if ( $post_format && !is_wp_error($post_format) )
					$classes[] = 'single-format-' . sanitize_html_class( $post_format );
				else
					$classes[] = 'single-format-standard';
			}
		}

		if ( is_attachment() ) {
			$mime_type = get_post_mime_type($post_id);
			$mime_prefix = array( 'application/', 'image/', 'text/', 'audio/', 'video/', 'music/' );
			$classes[] = 'attachmentid-' . $post_id;
			$classes[] = 'attachment-' . str_replace( $mime_prefix, '', $mime_type );
		}
	} elseif ( is_archive() ) {
		if ( is_post_type_archive() ) {
			$classes[] = 'post-type-archive';
			$post_type = get_query_var( 'post_type' );
			if ( is_array( $post_type ) )
				$post_type = reset( $post_type );
			$classes[] = 'post-type-archive-' . sanitize_html_class( $post_type );
		} else if ( is_author() ) {
			$author = $wp_query->get_queried_object();
			$classes[] = 'author';
			if ( isset( $author->user_nicename ) ) {
				$classes[] = 'author-' . sanitize_html_class( $author->user_nicename, $author->ID );
				$classes[] = 'author-' . $author->ID;
			}
		} elseif ( is_category() ) {
			$cat = $wp_query->get_queried_object();
			$classes[] = 'category';
			if ( isset( $cat->term_id ) ) {
				$classes[] = 'category-' . sanitize_html_class( $cat->slug, $cat->term_id );
				$classes[] = 'category-' . $cat->term_id;
			}
		} elseif ( is_tag() ) {
			$tags = $wp_query->get_queried_object();
			$classes[] = 'tag';
			if ( isset( $tags->term_id ) ) {
				$classes[] = 'tag-' . sanitize_html_class( $tags->slug, $tags->term_id );
				$classes[] = 'tag-' . $tags->term_id;
			}
		} elseif ( is_tax() ) {
			$term = $wp_query->get_queried_object();
			if ( isset( $term->term_id ) ) {
				$classes[] = 'tax-' . sanitize_html_class( $term->taxonomy );
				$classes[] = 'term-' . sanitize_html_class( $term->slug, $term->term_id );
				$classes[] = 'term-' . $term->term_id;
			}
		}
	} elseif ( is_page() ) {
		$classes[] = 'page';

		$page_id = $wp_query->get_queried_object_id();

		$post = get_post($page_id);

		$classes[] = 'page-id-' . $page_id;

		if ( $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'page' AND post_status = 'publish' LIMIT 1", $page_id) ) )
			$classes[] = 'page-parent';

		if ( $post->post_parent ) {
			$classes[] = 'page-child';
			$classes[] = 'parent-pageid-' . $post->post_parent;
		}
		if ( is_page_template() ) {
			$classes[] = 'page-template';
			$classes[] = 'page-template-' . sanitize_html_class( str_replace( '.', '-', get_page_template_slug( $page_id ) ) );
		} else {
			$classes[] = 'page-template-default';
		}
	}

	if ( is_user_logged_in() )
		$classes[] = 'logged-in';

	if ( is_admin_bar_showing() ) {
		$classes[] = 'admin-bar';
		$classes[] = 'no-customize-support';
	}

	if ( get_theme_mod( 'background_color' ) || get_background_image() )
		$classes[] = 'custom-background';

	$page = $wp_query->get( 'page' );

	if ( ! $page || $page < 2 )
		$page = $wp_query->get( 'paged' );

	if ( $page && $page > 1 && ! is_404() ) {
		$classes[] = 'paged-' . $page;

		if ( is_single() )
			$classes[] = 'single-paged-' . $page;
		elseif ( is_page() )
			$classes[] = 'page-paged-' . $page;
		elseif ( is_category() )
			$classes[] = 'category-paged-' . $page;
		elseif ( is_tag() )
			$classes[] = 'tag-paged-' . $page;
		elseif ( is_date() )
			$classes[] = 'date-paged-' . $page;
		elseif ( is_author() )
			$classes[] = 'author-paged-' . $page;
		elseif ( is_search() )
			$classes[] = 'search-paged-' . $page;
		elseif ( is_post_type_archive() )
			$classes[] = 'post-type-paged-' . $page;
	}

	if ( ! empty( $class ) ) {
		if ( !is_array( $class ) )
			$class = preg_split( '#\s+#', $class );
		$classes = array_merge( $classes, $class );
	} else {
		// Ensure that we always coerce class to being an array.
		$class = array();
	}

	$classes = array_map( 'esc_attr', $classes );

	/**
	 * Filter the list of CSS body classes for the current post or page.
	 *
	 * @since 2.8.0
	 *
	 * @param array  $classes An array of body classes.
	 * @param string $class   A comma-separated list of additional classes added to the body.
	 */
	return apply_filters( 'body_class', $classes, $class );
}

/**
 * Whether post requires password and correct password has been provided.
 *
 * @since 2.7.0
 *
 * @param int|WP_Post $post An optional post. Global $post used if not provided.
 * @return bool false if a password is not required or the correct password cookie is present, true otherwise.
 */
function post_password_required( $post = null ) {
	$post = get_post($post);

	if ( empty( $post->post_password ) )
		return false;

	if ( ! isset( $_COOKIE['wp-postpass_' . COOKIEHASH] ) )
		return true;

	require_once ABSPATH . 'wp-includes/class-phpass.php';
	$hasher = new PasswordHash( 8, true );

	$hash = wp_unslash( $_COOKIE[ 'wp-postpass_' . COOKIEHASH ] );
	if ( 0 !== strpos( $hash, '$P$B' ) )
		return true;

	return ! $hasher->CheckPassword( $post->post_password, $hash );
}

//
// Page Template Functions for usage in Themes
//

/**
 * The formatted output of a list of pages.
 *
 * Displays page links for paginated posts (i.e. includes the <!--nextpage-->.
 * Quicktag one or more times). This tag must be within The Loop.
 *
 * The defaults for overwriting are:
 * 'before' - Default is '<p> Pages:' (string). The html or text to prepend to
 *      each bookmarks.
 * 'after' - Default is '</p>' (string). The html or text to append to each
 *      bookmarks.
 * 'link_before' - Default is '' (string). The html or text to prepend to each
 *      Pages link inside the <a> tag. Also prepended to the current item, which
 *      is not linked.
 * 'link_after' - Default is '' (string). The html or text to append to each
 *      Pages link inside the <a> tag. Also appended to the current item, which
 *      is not linked.
 * 'next_or_number' - Default is 'number' (string). Indicates whether page
 *      numbers should be used. Valid values are number and next.
 * 'separator' - Default is ' ' (string). Text used between pagination links.
 * 'nextpagelink' - Default is 'Next Page' (string). Text for link to next page.
 *      of the bookmark.
 * 'previouspagelink' - Default is 'Previous Page' (string). Text for link to
 *      previous page, if available.
 * 'pagelink' - Default is '%' (String).Format string for page numbers. The % in
 *      the parameter string will be replaced with the page number, so Page %
 *      generates "Page 1", "Page 2", etc. Defaults to %, just the page number.
 * 'echo' - Default is 1 (integer). When not 0, this triggers the HTML to be
 *      echoed and then returned.
 *
 * @since 1.2.0
 *
 * @param string|array $args Optional. Overwrite the defaults.
 * @return string Formatted output in HTML.
 */
function wp_link_pages( $args = '' ) {
	$defaults = array(
		'before'           => '<p>' . __( 'Pages:' ),
		'after'            => '</p>',
		'link_before'      => '',
		'link_after'       => '',
		'next_or_number'   => 'number',
		'separator'        => ' ',
		'nextpagelink'     => __( 'Next page' ),
		'previouspagelink' => __( 'Previous page' ),
		'pagelink'         => '%',
		'echo'             => 1
	);

	$r = wp_parse_args( $args, $defaults );

	/**
	 * Filter the arguments used in retrieving page links for paginated posts.
	 *
	 * @since 3.0.0
	 *
	 * @param array $r An array of arguments for page links for paginated posts.
	 */
	$r = apply_filters( 'wp_link_pages_args', $r );
	extract( $r, EXTR_SKIP );

	global $page, $numpages, $multipage, $more;

	$output = '';
	if ( $multipage ) {
		if ( 'number' == $next_or_number ) {
			$output .= $before;
			for ( $i = 1; $i <= $numpages; $i++ ) {
				$link = $link_before . str_replace( '%', $i, $pagelink ) . $link_after;
				if ( $i != $page || ! $more && 1 == $page )
					$link = _wp_link_page( $i ) . $link . '</a>';

				/**
				 * Filter the HTML output of individual page number links.
				 *
				 * @since 3.6.0
				 *
				 * @param string $link The page number HTML output.
				 * @param int    $i    Page number for paginated posts' page links.
				 */
				$link = apply_filters( 'wp_link_pages_link', $link, $i );
				$output .= $separator . $link;
			}
			$output .= $after;
		} elseif ( $more ) {
			$output .= $before;
			$i = $page - 1;
			if ( $i ) {
				$link = _wp_link_page( $i ) . $link_before . $previouspagelink . $link_after . '</a>';

				/** This filter is documented in wp-includes/post-template.php */
				$link = apply_filters( 'wp_link_pages_link', $link, $i );
				$output .= $separator . $link;
			}
			$i = $page + 1;
			if ( $i <= $numpages ) {
				$link = _wp_link_page( $i ) . $link_before . $nextpagelink . $link_after . '</a>';

				/** This filter is documented in wp-includes/post-template.php */
				$link = apply_filters( 'wp_link_pages_link', $link, $i );
				$output .= $separator . $link;
			}
			$output .= $after;
		}
	}

	/**
	 * Filter the HTML output of page links for paginated posts.
	 *
	 * @since 3.6.0
	 *
	 * @param string $output HTML output of paginated posts' page links.
	 * @param array  $args   An array of arguments.
	 */
	$output = apply_filters( 'wp_link_pages', $output, $args );

	if ( $echo )
		echo $output;

	return $output;
}

/**
 * Helper function for wp_link_pages().
 *
 * @since 3.1.0
 * @access private
 *
 * @param int $i Page number.
 * @return string Link.
 */
function _wp_link_page( $i ) {
	global $wp_rewrite;
	$post = get_post();

	if ( 1 == $i ) {
		$url = get_permalink();
	} else {
		if ( '' == get_option('permalink_structure') || in_array($post->post_status, array('draft', 'pending')) )
			$url = add_query_arg( 'page', $i, get_permalink() );
		elseif ( 'page' == get_option('show_on_front') && get_option('page_on_front') == $post->ID )
			$url = trailingslashit(get_permalink()) . user_trailingslashit("$wp_rewrite->pagination_base/" . $i, 'single_paged');
		else
			$url = trailingslashit(get_permalink()) . user_trailingslashit($i, 'single_paged');
	}

	if ( is_preview() ) {
		$url = add_query_arg( array(
			'preview' => 'true'
		), $url );

		if ( ( 'draft' !== $post->post_status ) && isset( $_GET['preview_id'], $_GET['preview_nonce'] ) ) {
			$url = add_query_arg( array(
				'preview_id'    => wp_unslash( $_GET['preview_id'] ),
				'preview_nonce' => wp_unslash( $_GET['preview_nonce'] )
			), $url );
		}
	}

	return '<a href="' . esc_url( $url ) . '">';
}

//
// Post-meta: Custom per-post fields.
//

/**
 * Retrieve post custom meta data field.
 *
 * @since 1.5.0
 *
 * @param string $key Meta data key name.
 * @return bool|string|array Array of values or single value, if only one element exists. False will be returned if key does not exist.
 */
function post_custom( $key = '' ) {
	$custom = get_post_custom();

	if ( !isset( $custom[$key] ) )
		return false;
	elseif ( 1 == count($custom[$key]) )
		return $custom[$key][0];
	else
		return $custom[$key];
}

/**
 * Display list of post custom fields.
 *
 * @internal This will probably change at some point...
 * @since 1.2.0
 * @uses apply_filters() Calls 'the_meta_key' on list item HTML content, with key and value as separate parameters.
 */
function the_meta() {
	if ( $keys = get_post_custom_keys() ) {
		echo "<ul class='post-meta'>\n";
		foreach ( (array) $keys as $key ) {
			$keyt = trim($key);
			if ( is_protected_meta( $keyt, 'post' ) )
				continue;
			$values = array_map('trim', get_post_custom_values($key));
			$value = implode($values,', ');

			/**
			 * Filter the HTML output of the li element in the post custom fields list.
			 *
			 * @since 2.2.0
			 *
			 * @param string $html  The HTML output for the li element.
			 * @param string $key   Meta key.
			 * @param string $value Meta value.
			 */
			echo apply_filters( 'the_meta_key', "<li><span class='post-meta-key'>$key:</span> $value</li>\n", $key, $value );
		}
		echo "</ul>\n";
	}
}

//
// Pages
//

/**
 * Retrieve or display list of pages as a dropdown (select list).
 *
 * @since 2.1.0
 *
 * @param array|string $args Optional. Override default arguments.
 * @return string HTML content, if not displaying.
 */
function wp_dropdown_pages($args = '') {
	$defaults = array(
		'depth' => 0, 'child_of' => 0,
		'selected' => 0, 'echo' => 1,
		'name' => 'page_id', 'id' => '',
		'show_option_none' => '', 'show_option_no_change' => '',
		'option_none_value' => ''
	);

	$r = wp_parse_args( $args, $defaults );
	extract( $r, EXTR_SKIP );

	$pages = get_pages($r);
	$output = '';
	// Back-compat with old system where both id and name were based on $name argument
	if ( empty($id) )
		$id = $name;

	if ( ! empty($pages) ) {
		$output = "<select name='" . esc_attr( $name ) . "' id='" . esc_attr( $id ) . "'>\n";
		if ( $show_option_no_change )
			$output .= "\t<option value=\"-1\">$show_option_no_change</option>";
		if ( $show_option_none )
			$output .= "\t<option value=\"" . esc_attr($option_none_value) . "\">$show_option_none</option>\n";
		$output .= walk_page_dropdown_tree($pages, $depth, $r);
		$output .= "</select>\n";
	}

	/**
	 * Filter the HTML output of a list of pages as a drop down.
	 *
	 * @since 2.1.0
	 *
	 * @param string $output HTML output for drop down list of pages.
	 */
	$output = apply_filters( 'wp_dropdown_pages', $output );

	if ( $echo )
		echo $output;

	return $output;
}

/**
 * Retrieve or display list of pages in list (li) format.
 *
 * @since 1.5.0
 *
 * @see get_pages()
 *
 * @param array|string $args {
 *     Array or string of arguments. Optional.
 *
 *     @type int    $child_of     Display only the sub-pages of a single page by ID. Default 0 (all pages).
 *     @type string $authors      Comma-separated list of author IDs. Default empty (all authors).
 *     @type string $date_format  PHP date format to use for the listed pages. Relies on the 'show_date' parameter.
 *                                Default is the value of 'date_format' option.
 *     @type int    $depth        Number of levels in the hierarchy of pages to include in the generated list.
 *                                Accepts -1 (any depth), 0 (all pages), 1 (top-level pages only), and n (pages to
 *                                the given n depth). Default 0.
 *     @type bool   $echo         Whether or not to echo the list of pages. Default true.
 *     @type string $exclude      Comma-separated list of page IDs to exclude. Default empty.
 *     @type array  $include      Comma-separated list of page IDs to include. Default empty.
 *     @type string $link_after   Text or HTML to follow the page link label. Default null.
 *     @type string $link_before  Text or HTML to precede the page link label. Default null.
 *     @type string $post_type    Post type to query for. Default 'page'.
 *     @type string $post_status  Comma-separated list of post statuses to include. Default 'publish'.
 *     @type string $show_date	  Whether to display the page publish or modified date for each page. Accepts
 *                                'modified' or any other value. An empty value hides the date. Default empty.
 *     @type string $sort_column  Comma-separated list of column names to sort the pages by. Accepts 'post_author',
 *                                'post_date', 'post_title', 'post_name', 'post_modified', 'post_modified_gmt',
 *                                'menu_order', 'post_parent', 'ID', 'rand', or 'comment_count'. Default 'post_title'.
 *     @type string $title_li     List heading. Passing a null or empty value will result in no heading, and the list
 *                                will not be wrapped with unordered list `<ul>` tags. Default 'Pages'.
 *     @type Walker $walker       Walker instance to use for listing pages. Default empty (Walker_Page).
 * }
 * @return string HTML list of pages.
 */
function wp_list_pages( $args = '' ) {
	$defaults = array(
		'depth' => 0, 'show_date' => '',
		'date_format' => get_option('date_format'),
		'child_of' => 0, 'exclude' => '',
		'title_li' => __('Pages'), 'echo' => 1,
		'authors' => '', 'sort_column' => 'menu_order, post_title',
		'link_before' => '', 'link_after' => '', 'walker' => '',
	);

	$r = wp_parse_args( $args, $defaults );
	extract( $r, EXTR_SKIP );

	$output = '';
	$current_page = 0;

	// sanitize, mostly to keep spaces out
	$r['exclude'] = preg_replace('/[^0-9,]/', '', $r['exclude']);

	// Allow plugins to filter an array of excluded pages (but don't put a nullstring into the array)
	$exclude_array = ( $r['exclude'] ) ? explode(',', $r['exclude']) : array();

	/**
	 * Filter the array of pages to exclude from the pages list.
	 *
	 * @since 2.1.0
	 *
	 * @param array $exclude_array An array of page IDs to exclude.
	 */
	$r['exclude'] = implode( ',', apply_filters( 'wp_list_pages_excludes', $exclude_array ) );

	// Query pages.
	$r['hierarchical'] = 0;
	$pages = get_pages($r);

	if ( !empty($pages) ) {
		if ( $r['title_li'] )
			$output .= '<li class="pagenav">' . $r['title_li'] . '<ul>';

		global $wp_query;
		if ( is_page() || is_attachment() || $wp_query->is_posts_page ) {
			$current_page = get_queried_object_id();
		} elseif ( is_singular() ) {
			$queried_object = get_queried_object();
			if ( is_post_type_hierarchical( $queried_object->post_type ) ) {
				$current_page = $queried_object->ID;
			}
		}

		$output .= walk_page_tree($pages, $r['depth'], $current_page, $r);

		if ( $r['title_li'] )
			$output .= '</ul></li>';
	}

	/**
	 * Filter the HTML output of the pages to list.
	 *
	 * @since 1.5.1
	 *
	 * @see wp_list_pages()
	 *
	 * @param string $output HTML output of the pages list.
	 * @param array  $r      An array of page-listing arguments.
	 */
	$output = apply_filters( 'wp_list_pages', $output, $r );

	if ( $r['echo'] )
		echo $output;
	else
		return $output;
}

/**
 * Display or retrieve list of pages with optional home link.
 *
 * The arguments are listed below and part of the arguments are for {@link
 * wp_list_pages()} function. Check that function for more info on those
 * arguments.
 *
 * <ul>
 * <li><strong>sort_column</strong> - How to sort the list of pages. Defaults
 * to 'menu_order, post_title'. Use column for posts table.</li>
 * <li><strong>menu_class</strong> - Class to use for the div ID which contains
 * the page list. Defaults to 'menu'.</li>
 * <li><strong>echo</strong> - Whether to echo list or return it. Defaults to
 * echo.</li>
 * <li><strong>link_before</strong> - Text before show_home argument text.</li>
 * <li><strong>link_after</strong> - Text after show_home argument text.</li>
 * <li><strong>show_home</strong> - If you set this argument, then it will
 * display the link to the home page. The show_home argument really just needs
 * to be set to the value of the text of the link.</li>
 * </ul>
 *
 * @since 2.7.0
 *
 * @param array|string $args
 * @return string html menu
 */
function wp_page_menu( $args = array() ) {
	$defaults = array('sort_column' => 'menu_order, post_title', 'menu_class' => 'menu', 'echo' => true, 'link_before' => '', 'link_after' => '');
	$args = wp_parse_args( $args, $defaults );

	/**
	 * Filter the arguments used to generate a page-based menu.
	 *
	 * @since 2.7.0
	 *
	 * @see wp_page_menu()
	 *
	 * @param array $args An array of page menu arguments.
	 */
	$args = apply_filters( 'wp_page_menu_args', $args );

	$menu = '';

	$list_args = $args;

	// Show Home in the menu
	if ( ! empty($args['show_home']) ) {
		if ( true === $args['show_home'] || '1' === $args['show_home'] || 1 === $args['show_home'] )
			$text = __('Home');
		else
			$text = $args['show_home'];
		$class = '';
		if ( is_front_page() && !is_paged() )
			$class = 'class="current_page_item"';
		$menu .= '<li ' . $class . '><a href="' . home_url( '/' ) . '">' . $args['link_before'] . $text . $args['link_after'] . '</a></li>';
		// If the front page is a page, add it to the exclude list
		if (get_option('show_on_front') == 'page') {
			if ( !empty( $list_args['exclude'] ) ) {
				$list_args['exclude'] .= ',';
			} else {
				$list_args['exclude'] = '';
			}
			$list_args['exclude'] .= get_option('page_on_front');
		}
	}

	$list_args['echo'] = false;
	$list_args['title_li'] = '';
	$menu .= str_replace( array( "\r", "\n", "\t" ), '', wp_list_pages($list_args) );

	if ( $menu )
		$menu = '<ul>' . $menu . '</ul>';

	$menu = '<div class="' . esc_attr($args['menu_class']) . '">' . $menu . "</div>\n";

	/**
	 * Filter the HTML output of a page-based menu.
	 *
	 * @since 2.7.0
	 *
	 * @see wp_page_menu()
	 *
	 * @param string $menu The HTML output.
	 * @param array  $args An array of arguments.
	 */
	$menu = apply_filters( 'wp_page_menu', $menu, $args );
	if ( $args['echo'] )
		echo $menu;
	else
		return $menu;
}

//
// Page helpers
//

/**
 * Retrieve HTML list content for page list.
 *
 * @uses Walker_Page to create HTML list content.
 * @since 2.1.0
 * @see Walker_Page::walk() for parameters and return description.
 */
function walk_page_tree($pages, $depth, $current_page, $r) {
	if ( empty($r['walker']) )
		$walker = new Walker_Page;
	else
		$walker = $r['walker'];

	foreach ( (array) $pages as $page ) {
		if ( $page->post_parent )
			$r['pages_with_children'][ $page->post_parent ] = true;
	}

	$args = array($pages, $depth, $r, $current_page);
	return call_user_func_array(array($walker, 'walk'), $args);
}

/**
 * Retrieve HTML dropdown (select) content for page list.
 *
 * @uses Walker_PageDropdown to create HTML dropdown content.
 * @since 2.1.0
 * @see Walker_PageDropdown::walk() for parameters and return description.
 */
function walk_page_dropdown_tree() {
	$args = func_get_args();
	if ( empty($args[2]['walker']) ) // the user's options are the third parameter
		$walker = new Walker_PageDropdown;
	else
		$walker = $args[2]['walker'];

	return call_user_func_array(array($walker, 'walk'), $args);
}

/**
 * Create HTML list of pages.
 *
 * @since 2.1.0
 * @uses Walker
 */
class Walker_Page extends Walker {
	/**
	 * @see Walker::$tree_type
	 * @since 2.1.0
	 * @var string
	 */
	var $tree_type = 'page';

	/**
	 * @see Walker::$db_fields
	 * @since 2.1.0
	 * @todo Decouple this.
	 * @var array
	 */
	var $db_fields = array ('parent' => 'post_parent', 'id' => 'ID');

	/**
	 * @see Walker::start_lvl()
	 * @since 2.1.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int $depth Depth of page. Used for padding.
	 * @param array $args
	 */
	function start_lvl( &$output, $depth = 0, $args = array() ) {
		$indent = str_repeat("\t", $depth);
		$output .= "\n$indent<ul class='children'>\n";
	}

	/**
	 * @see Walker::end_lvl()
	 * @since 2.1.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int $depth Depth of page. Used for padding.
	 * @param array $args
	 */
	function end_lvl( &$output, $depth = 0, $args = array() ) {
		$indent = str_repeat("\t", $depth);
		$output .= "$indent</ul>\n";
	}

	/**
	 * @see Walker::start_el()
	 * @since 2.1.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $page Page data object.
	 * @param int $depth Depth of page. Used for padding.
	 * @param int $current_page Page ID.
	 * @param array $args
	 */
	function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
		if ( $depth )
			$indent = str_repeat("\t", $depth);
		else
			$indent = '';

		extract($args, EXTR_SKIP);
		$css_class = array('page_item', 'page-item-'.$page->ID);

		if( isset( $args['pages_with_children'][ $page->ID ] ) )
			$css_class[] = 'page_item_has_children';

		if ( !empty($current_page) ) {
			$_current_page = get_post( $current_page );
			if ( in_array( $page->ID, $_current_page->ancestors ) )
				$css_class[] = 'current_page_ancestor';
			if ( $page->ID == $current_page )
				$css_class[] = 'current_page_item';
			elseif ( $_current_page && $page->ID == $_current_page->post_parent )
				$css_class[] = 'current_page_parent';
		} elseif ( $page->ID == get_option('page_for_posts') ) {
			$css_class[] = 'current_page_parent';
		}

		/**
		 * Filter the list of CSS classes to include with each page item in the list.
		 *
		 * @since 2.8.0
		 *
		 * @see wp_list_pages()
		 *
		 * @param array   $css_class    An array of CSS classes to be applied
		 *                             to each list item.
		 * @param WP_Post $page         Page data object.
		 * @param int     $depth        Depth of page, used for padding.
		 * @param array   $args         An array of arguments.
		 * @param int     $current_page ID of the current page.
		 */
		$css_class = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) );

		if ( '' === $page->post_title )
			$page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );

		/** This filter is documented in wp-includes/post-template.php */
		$output .= $indent . '<li class="' . $css_class . '"><a href="' . get_permalink($page->ID) . '">' . $link_before . apply_filters( 'the_title', $page->post_title, $page->ID ) . $link_after . '</a>';

		if ( !empty($show_date) ) {
			if ( 'modified' == $show_date )
				$time = $page->post_modified;
			else
				$time = $page->post_date;

			$output .= " " . mysql2date($date_format, $time);
		}
	}

	/**
	 * @see Walker::end_el()
	 * @since 2.1.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $page Page data object. Not used.
	 * @param int $depth Depth of page. Not Used.
	 * @param array $args
	 */
	function end_el( &$output, $page, $depth = 0, $args = array() ) {
		$output .= "</li>\n";
	}

}

/**
 * Create HTML dropdown list of pages.
 *
 * @since 2.1.0
 * @uses Walker
 */
class Walker_PageDropdown extends Walker {
	/**
	 * @see Walker::$tree_type
	 * @since 2.1.0
	 * @var string
	 */
	var $tree_type = 'page';

	/**
	 * @see Walker::$db_fields
	 * @since 2.1.0
	 * @todo Decouple this
	 * @var array
	 */
	var $db_fields = array ('parent' => 'post_parent', 'id' => 'ID');

	/**
	 * @see Walker::start_el()
	 * @since 2.1.0
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param object $page Page data object.
	 * @param int $depth Depth of page in reference to parent pages. Used for padding.
	 * @param array $args Uses 'selected' argument for selected page to set selected HTML attribute for option element.
	 * @param int $id
	 */
	function start_el( &$output, $page, $depth = 0, $args = array(), $id = 0 ) {
		$pad = str_repeat('&nbsp;', $depth * 3);

		$output .= "\t<option class=\"level-$depth\" value=\"$page->ID\"";
		if ( $page->ID == $args['selected'] )
			$output .= ' selected="selected"';
		$output .= '>';

		$title = $page->post_title;
		if ( '' === $title ) {
			$title = sprintf( __( '#%d (no title)' ), $page->ID );
		}

		/**
		 * Filter the page title when creating an HTML drop-down list of pages.
		 *
		 * @since 3.1.0
		 *
		 * @param string $title Page title.
		 * @param object $page  Page data object.
		 */
		$title = apply_filters( 'list_pages', $title, $page );
		$output .= $pad . esc_html( $title );
		$output .= "</option>\n";
	}
}

//
// Attachments
//

/**
 * Display an attachment page link using an image or icon.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $id Optional. Post ID or post object.
 * @param bool $fullsize Optional, default is false. Whether to use full size.
 * @param bool $deprecated Deprecated. Not used.
 * @param bool $permalink Optional, default is false. Whether to include permalink.
 */
function the_attachment_link( $id = 0, $fullsize = false, $deprecated = false, $permalink = false ) {
	if ( !empty( $deprecated ) )
		_deprecated_argument( __FUNCTION__, '2.5' );

	if ( $fullsize )
		echo wp_get_attachment_link($id, 'full', $permalink);
	else
		echo wp_get_attachment_link($id, 'thumbnail', $permalink);
}

/**
 * Retrieve an attachment page link using an image or icon, if possible.
 *
 * @since 2.5.0
 * @uses apply_filters() Calls 'wp_get_attachment_link' filter on HTML content with same parameters as function.
 *
 * @param int|WP_Post $id Optional. Post ID or post object.
 * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string.
 * @param bool $permalink Optional, default is false. Whether to add permalink to image.
 * @param bool $icon Optional, default is false. Whether to include icon.
 * @param string|bool $text Optional, default is false. If string, then will be link text.
 * @return string HTML content.
 */
function wp_get_attachment_link( $id = 0, $size = 'thumbnail', $permalink = false, $icon = false, $text = false ) {
	$id = intval( $id );
	$_post = get_post( $id );

	if ( empty( $_post ) || ( 'attachment' != $_post->post_type ) || ! $url = wp_get_attachment_url( $_post->ID ) )
		return __( 'Missing Attachment' );

	if ( $permalink )
		$url = get_attachment_link( $_post->ID );

	if ( $text )
		$link_text = $text;
	elseif ( $size && 'none' != $size )
		$link_text = wp_get_attachment_image( $id, $size, $icon );
	else
		$link_text = '';

	if ( trim( $link_text ) == '' )
		$link_text = $_post->post_title;

	/**
	 * Filter a retrieved attachment page link.
	 *
	 * @since 2.7.0
	 *
	 * @param string      $link_html The page link HTML output.
	 * @param int         $id        Post ID.
	 * @param string      $size      Image size. Default 'thumbnail'.
	 * @param bool        $permalink Whether to add permalink to image. Default false.
	 * @param bool        $icon      Whether to include an icon. Default false.
	 * @param string|bool $text      If string, will be link text. Default false.
	 */
	return apply_filters( 'wp_get_attachment_link', "<a href='$url'>$link_text</a>", $id, $size, $permalink, $icon, $text );
}

/**
 * Wrap attachment in <<p>> element before content.
 *
 * @since 2.0.0
 *
 * @param string $content
 * @return string
 */
function prepend_attachment($content) {
	$post = get_post();

	if ( empty($post->post_type) || $post->post_type != 'attachment' )
		return $content;

	if ( 0 === strpos( $post->post_mime_type, 'video' ) ) {
		$meta = wp_get_attachment_metadata( get_the_ID() );
		$atts = array( 'src' => wp_get_attachment_url() );
		if ( ! empty( $meta['width'] ) && ! empty( $meta['height'] ) ) {
			$atts['width'] = (int) $meta['width'];
			$atts['height'] = (int) $meta['height'];
		}
		$p = wp_video_shortcode( $atts );
	} elseif ( 0 === strpos( $post->post_mime_type, 'audio' ) ) {
		$p = wp_audio_shortcode( array( 'src' => wp_get_attachment_url() ) );
	} else {
		$p = '<p class="attachment">';
		// show the medium sized image representation of the attachment if available, and link to the raw file
		$p .= wp_get_attachment_link(0, 'medium', false);
		$p .= '</p>';
	}

	/**
	 * Filter the attachment markup to be prepended to the post content.
	 *
	 * @since 2.0.0
	 *
	 * @see prepend_attachment()
	 *
	 * @param string $p The attachment HTML output.
	 */
	$p = apply_filters( 'prepend_attachment', $p );

	return "$p\n$content";
}

//
// Misc
//

/**
 * Retrieve protected post password form content.
 *
 * @since 1.0.0
 * @uses apply_filters() Calls 'the_password_form' filter on output.
 * @param int|WP_Post $post Optional. A post ID or post object.
 * @return string HTML content for password form for password protected post.
 */
function get_the_password_form( $post = 0 ) {
	$post = get_post( $post );
	$label = 'pwbox-' . ( empty($post->ID) ? rand() : $post->ID );
	$output = '<form action="' . esc_url( site_url( 'wp-login.php?action=postpass', 'login_post' ) ) . '" class="post-password-form" method="post">
	<p>' . __( 'This content is password protected. To view it please enter your password below:' ) . '</p>
	<p><label for="' . $label . '">' . __( 'Password:' ) . ' <input name="post_password" id="' . $label . '" type="password" size="20" /></label> <input type="submit" name="Submit" value="' . esc_attr__( 'Submit' ) . '" /></p></form>
	';

	/**
	 * Filter the HTML output for the protected post password form.
	 *
	 * If modifying the password field, please note that the core database schema
	 * limits the password field to 20 characters regardless of the value of the
	 * size attribute in the form input.
	 *
	 * @since 2.7.0
	 *
	 * @param string $output The password form HTML output.
	 */
	return apply_filters( 'the_password_form', $output );
}

/**
 * Whether currently in a page template.
 *
 * This template tag allows you to determine if you are in a page template.
 * You can optionally provide a template name and then the check will be
 * specific to that template.
 *
 * @since 2.5.0
 * @uses $wp_query
 *
 * @param string $template The specific template name if specific matching is required.
 * @return bool True on success, false on failure.
 */
function is_page_template( $template = '' ) {
	if ( ! is_page() )
		return false;

	$page_template = get_page_template_slug( get_queried_object_id() );

	if ( empty( $template ) )
		return (bool) $page_template;

	if ( $template == $page_template )
		return true;

	if ( 'default' == $template && ! $page_template )
		return true;

	return false;
}

/**
 * Get the specific template name for a page.
 *
 * @since 3.4.0
 *
 * @param int $post_id Optional. The page ID to check. Defaults to the current post, when used in the loop.
 * @return string|bool Page template filename. Returns an empty string when the default page template
 * 	is in use. Returns false if the post is not a page.
 */
function get_page_template_slug( $post_id = null ) {
	$post = get_post( $post_id );
	if ( ! $post || 'page' != $post->post_type )
		return false;
	$template = get_post_meta( $post->ID, '_wp_page_template', true );
	if ( ! $template || 'default' == $template )
		return '';
	return $template;
}

/**
 * Retrieve formatted date timestamp of a revision (linked to that revisions's page).
 *
 * @since 2.6.0
 *
 * @uses date_i18n()
 *
 * @param int|object $revision Revision ID or revision object.
 * @param bool $link Optional, default is true. Link to revisions's page?
 * @return string i18n formatted datetimestamp or localized 'Current Revision'.
 */
function wp_post_revision_title( $revision, $link = true ) {
	if ( !$revision = get_post( $revision ) )
		return $revision;

	if ( !in_array( $revision->post_type, array( 'post', 'page', 'revision' ) ) )
		return false;

	/* translators: revision date format, see http://php.net/date */
	$datef = _x( 'j F, Y @ G:i', 'revision date format');
	/* translators: 1: date */
	$autosavef = _x( '%1$s [Autosave]', 'post revision title extra' );
	/* translators: 1: date */
	$currentf  = _x( '%1$s [Current Revision]', 'post revision title extra' );

	$date = date_i18n( $datef, strtotime( $revision->post_modified ) );
	if ( $link && current_user_can( 'edit_post', $revision->ID ) && $link = get_edit_post_link( $revision->ID ) )
		$date = "<a href='$link'>$date</a>";

	if ( !wp_is_post_revision( $revision ) )
		$date = sprintf( $currentf, $date );
	elseif ( wp_is_post_autosave( $revision ) )
		$date = sprintf( $autosavef, $date );

	return $date;
}

/**
 * Retrieve formatted date timestamp of a revision (linked to that revisions's page).
 *
 * @since 3.6.0
 *
 * @uses date_i18n()
 *
 * @param int|object $revision Revision ID or revision object.
 * @param bool $link Optional, default is true. Link to revisions's page?
 * @return string gravatar, user, i18n formatted datetimestamp or localized 'Current Revision'.
 */
function wp_post_revision_title_expanded( $revision, $link = true ) {
	if ( !$revision = get_post( $revision ) )
		return $revision;

	if ( !in_array( $revision->post_type, array( 'post', 'page', 'revision' ) ) )
		return false;

	$author = get_the_author_meta( 'display_name', $revision->post_author );
	/* translators: revision date format, see http://php.net/date */
	$datef = _x( 'j F, Y @ G:i:s', 'revision date format');

	$gravatar = get_avatar( $revision->post_author, 24 );

	$date = date_i18n( $datef, strtotime( $revision->post_modified ) );
	if ( $link && current_user_can( 'edit_post', $revision->ID ) && $link = get_edit_post_link( $revision->ID ) )
		$date = "<a href='$link'>$date</a>";

	$revision_date_author = sprintf(
		/* translators: post revision title: 1: author avatar, 2: author name, 3: time ago, 4: date */
		_x( '%1$s %2$s, %3$s ago (%4$s)', 'post revision title' ),
		$gravatar,
		$author,
		human_time_diff( strtotime( $revision->post_modified ), current_time( 'timestamp' ) ),
		$date
	);

	$autosavef = __( '%1$s [Autosave]' );
	$currentf  = __( '%1$s [Current Revision]' );

	if ( !wp_is_post_revision( $revision ) )
		$revision_date_author = sprintf( $currentf, $revision_date_author );
	elseif ( wp_is_post_autosave( $revision ) )
		$revision_date_author = sprintf( $autosavef, $revision_date_author );

	return $revision_date_author;
}

/**
 * Display list of a post's revisions.
 *
 * Can output either a UL with edit links or a TABLE with diff interface, and
 * restore action links.
 *
 * @since 2.6.0
 *
 * @uses wp_get_post_revisions()
 * @uses wp_post_revision_title_expanded()
 * @uses get_edit_post_link()
 * @uses get_the_author_meta()
 *
 * @param int|WP_Post $post_id Optional. Post ID or post object.
 * @param string $type 'all' (default), 'revision' or 'autosave'
 * @return null
 */
function wp_list_post_revisions( $post_id = 0, $type = 'all' ) {
	if ( ! $post = get_post( $post_id ) )
		return;

	// $args array with (parent, format, right, left, type) deprecated since 3.6
	if ( is_array( $type ) ) {
		$type = ! empty( $type['type'] ) ? $type['type']  : $type;
		_deprecated_argument( __FUNCTION__, '3.6' );
	}

	if ( ! $revisions = wp_get_post_revisions( $post->ID ) )
		return;

	$rows = '';
	foreach ( $revisions as $revision ) {
		if ( ! current_user_can( 'read_post', $revision->ID ) )
			continue;

		$is_autosave = wp_is_post_autosave( $revision );
		if ( ( 'revision' === $type && $is_autosave ) || ( 'autosave' === $type && ! $is_autosave ) )
			continue;

		$rows .= "\t<li>" . wp_post_revision_title_expanded( $revision ) . "</li>\n";
	}

	echo "<div class='hide-if-js'><p>" . __( 'JavaScript must be enabled to use this feature.' ) . "</p></div>\n";

	echo "<ul class='post-revisions hide-if-no-js'>\n";
	echo $rows;
	echo "</ul>";
}