<?php

/**

 * Author Template functions for use in themes.

 *

 * These functions must be used within the WordPress Loop.

 *

 * @link http://codex.wordpress.org/Author_Templates

 *

 * @package WordPress

 * @subpackage Template

 */

/**

 * Retrieve the author of the current post.

 *

 * @since 1.5

 * @uses $authordata The current author's DB object.

 * @uses apply_filters() Calls 'the_author' hook on the author display name.

 *

 * @param string $deprecated Deprecated.

 * @return string The author's display name.

 */

function get_the_author($deprecated = '') {

	global $authordata;

	if ( !empty( $deprecated ) )

		_deprecated_argument( __FUNCTION__, '2.1' );

	return apply_filters('the_author', is_object($authordata) ? $authordata->display_name : null);

}

/**

 * Display the name of the author of the current post.

 *

 * The behavior of this function is based off of old functionality predating

 * get_the_author(). This function is not deprecated, but is designed to echo

 * the value from get_the_author() and as an result of any old theme that might

 * still use the old behavior will also pass the value from get_the_author().

 *

 * The normal, expected behavior of this function is to echo the author and not

 * return it. However, backwards compatibility has to be maintained.

 *

 * @since 0.71

 * @see get_the_author()

 * @link http://codex.wordpress.org/Template_Tags/the_author

 *

 * @param string $deprecated Deprecated.

 * @param string $deprecated_echo Deprecated. Use get_the_author(). Echo the string or return it.

 * @return string The author's display name, from get_the_author().

 */

function the_author( $deprecated = '', $deprecated_echo = true ) {

	if ( !empty( $deprecated ) )

		_deprecated_argument( __FUNCTION__, '2.1' );

	if ( $deprecated_echo !== true )

		_deprecated_argument( __FUNCTION__, '1.5', __('Use <code>get_the_author()</code> instead if you do not want the value echoed.') );

	if ( $deprecated_echo )

		echo get_the_author();

	return get_the_author();

}

/**

 * Retrieve the author who last edited the current post.

 *

 * @since 2.8

 * @uses $post The current post's DB object.

 * @uses get_post_meta() Retrieves the ID of the author who last edited the current post.

 * @uses get_userdata() Retrieves the author's DB object.

 * @uses apply_filters() Calls 'the_modified_author' hook on the author display name.

 * @return string The author's display name.

 */

function get_the_modified_author() {

	global $post;

	if ( $last_id = get_post_meta($post->ID, '_edit_last', true) ) {

		$last_user = get_userdata($last_id);

		return apply_filters('the_modified_author', $last_user->display_name);

	}

}

/**

 * Display the name of the author who last edited the current post.

 *

 * @since 2.8

 * @see get_the_author()

 * @return string The author's display name, from get_the_modified_author().

 */

function the_modified_author() {

	echo get_the_modified_author();

}

/**

 * Retrieve the requested data of the author of the current post.

 * @link http://codex.wordpress.org/Template_Tags/the_author_meta

 * @since 2.8.0

 * @uses $authordata The current author's DB object (if $user_id not specified).

 * @param string $field selects the field of the users record.

 * @param int $user_id Optional. User ID.

 * @return string The author's field from the current author's DB object.

 */

function get_the_author_meta( $field = '', $user_id = false ) {

	if ( ! $user_id ) {

		global $authordata;

		$user_id = isset( $authordata->ID ) ? $authordata->ID : 0;

	} else {

		$authordata = get_userdata( $user_id );

	}

	if ( in_array( $field, array( 'login', 'pass', 'nicename', 'email', 'url', 'registered', 'activation_key', 'status' ) ) )

		$field = 'user_' . $field;

	$value = isset( $authordata->$field ) ? $authordata->$field : '';

	return apply_filters( 'get_the_author_' . $field, $value, $user_id );

}

/**

 * Retrieve the requested data of the author of the current post.

 * @link http://codex.wordpress.org/Template_Tags/the_author_meta

 * @since 2.8.0

 * @param string $field selects the field of the users record.

 * @param int $user_id Optional. User ID.

 * @echo string The author's field from the current author's DB object.

 */

function the_author_meta($field = '', $user_id = false) {

	echo apply_filters('the_author_' . $field, get_the_author_meta($field, $user_id), $user_id);

}

/**

 * Retrieve either author's link or author's name.

 *

 * If the author has a home page set, return an HTML link, otherwise just return the

 * author's name.

 *

 * @uses get_the_author_meta()

 * @uses get_the_author()

 */

function get_the_author_link() {

	if ( get_the_author_meta('url') ) {

		return '<a href="' . get_the_author_meta('url') . '" title="' . esc_attr( sprintf(__("Visit %s&#8217;s website"), get_the_author()) ) . '" rel="author external">' . get_the_author() . '</a>';

	} else {

		return get_the_author();

	}

}

/**

 * Display either author's link or author's name.

 *

 * If the author has a home page set, echo an HTML link, otherwise just echo the

 * author's name.

 *

 * @link http://codex.wordpress.org/Template_Tags/the_author_link

 * @since 2.1

 * @uses get_the_author_link()

 */

function the_author_link() {

	echo get_the_author_link();

}

/**

 * Retrieve the number of posts by the author of the current post.

 *

 * @since 1.5

 * @uses $post The current post in the Loop's DB object.

 * @uses count_user_posts()

 * @return int The number of posts by the author.

 */

function get_the_author_posts() {

	global $post;

	return count_user_posts($post->post_author);

}

/**

 * Display the number of posts by the author of the current post.

 *

 * @link http://codex.wordpress.org/Template_Tags/the_author_posts

 * @since 0.71

 * @uses get_the_author_posts() Echoes returned value from function.

 */

function the_author_posts() {

	echo get_the_author_posts();

}

/**

 * Display an HTML link to the author page of the author of the current post.

 *

 * Does just echo get_author_posts_url() function, like the others do. The

 * reason for this, is that another function is used to help in printing the

 * link to the author's posts.

 *

 * @link http://codex.wordpress.org/Template_Tags/the_author_posts_link

 * @since 1.2.0

 * @uses $authordata The current author's DB object.

 * @uses get_author_posts_url()

 * @uses get_the_author()

 * @param string $deprecated Deprecated.

 */

function the_author_posts_link($deprecated = '') {

	if ( !empty( $deprecated ) )

		_deprecated_argument( __FUNCTION__, '2.1' );

	global $authordata;

	if ( !is_object( $authordata ) )

		return false;

	$link = sprintf(

		'<a href="%1$s" title="%2$s" rel="author">%3$s</a>',

		get_author_posts_url( $authordata->ID, $authordata->user_nicename ),

		esc_attr( sprintf( __( 'Posts by %s' ), get_the_author() ) ),

		get_the_author()

	);

	echo apply_filters( 'the_author_posts_link', $link );

}

/**

 * Retrieve the URL to the author page for the user with the ID provided.

 *

 * @since 2.1.0

 * @uses $wp_rewrite WP_Rewrite

 * @return string The URL to the author's page.

 */

function get_author_posts_url($author_id, $author_nicename = '') {

	global $wp_rewrite;

	$auth_ID = (int) $author_id;

	$link = $wp_rewrite->get_author_permastruct();

	if ( empty($link) ) {

		$file = home_url( '/' );

		$link = $file . '?author=' . $auth_ID;

	} else {

		if ( '' == $author_nicename ) {

			$user = get_userdata($author_id);

			if ( !empty($user->user_nicename) )

				$author_nicename = $user->user_nicename;

		}

		$link = str_replace('%author%', $author_nicename, $link);

		$link = home_url( user_trailingslashit( $link ) );

	}

	$link = apply_filters('author_link', $link, $author_id, $author_nicename);

	return $link;

}

/**

 * List all the authors of the blog, with several options available.

 *

 * <ul>

 * <li>optioncount (boolean) (false): Show the count in parenthesis next to the

 * author's name.</li>

 * <li>exclude_admin (boolean) (true): Exclude the 'admin' user that is

 * installed bydefault.</li>

 * <li>show_fullname (boolean) (false): Show their full names.</li>

 * <li>hide_empty (boolean) (true): Don't show authors without any posts.</li>

 * <li>feed (string) (''): If isn't empty, show links to author's feeds.</li>

 * <li>feed_image (string) (''): If isn't empty, use this image to link to

 * feeds.</li>

 * <li>echo (boolean) (true): Set to false to return the output, instead of

 * echoing.</li>

 * <li>style (string) ('list'): Whether to display list of authors in list form

 * or as a string.</li>

 * <li>html (bool) (true): Whether to list the items in html form or plaintext.

 * </li>

 * </ul>

 *

 * @link http://codex.wordpress.org/Template_Tags/wp_list_authors

 * @since 1.2.0

 * @param array $args The argument array.

 * @return null|string The output, if echo is set to false.

 */

function wp_list_authors($args = '') {

	global $wpdb;

	$defaults = array(

		'orderby' => 'name', 'order' => 'ASC', 'number' => '',

		'optioncount' => false, 'exclude_admin' => true,

		'show_fullname' => false, 'hide_empty' => true,

		'feed' => '', 'feed_image' => '', 'feed_type' => '', 'echo' => true,

		'style' => 'list', 'html' => true

	);

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

	extract( $args, EXTR_SKIP );

	$return = '';

	$query_args = wp_array_slice_assoc( $args, array( 'orderby', 'order', 'number' ) );

	$query_args['fields'] = 'ids';

	$authors = get_users( $query_args );

	$author_count = array();

	foreach ( (array) $wpdb->get_results("SELECT DISTINCT post_author, COUNT(ID) AS count FROM $wpdb->posts WHERE post_type = 'post' AND " . get_private_posts_cap_sql( 'post' ) . " GROUP BY post_author") as $row )

		$author_count[$row->post_author] = $row->count;

	foreach ( $authors as $author_id ) {

		$author = get_userdata( $author_id );

		if ( $exclude_admin && 'admin' == $author->display_name )

			continue;

		$posts = isset( $author_count[$author->ID] ) ? $author_count[$author->ID] : 0;

		if ( !$posts && $hide_empty )

			continue;

		$link = '';

		if ( $show_fullname && $author->first_name && $author->last_name )

			$name = "$author->first_name $author->last_name";

		else

			$name = $author->display_name;

		if ( !$html ) {

			$return .= $name . ', ';

			continue; // No need to go further to process HTML.

		}

		if ( 'list' == $style ) {

			$return .= '<li>';

		}

		$link = '<a href="' . get_author_posts_url( $author->ID, $author->user_nicename ) . '" title="' . esc_attr( sprintf(__("Posts by %s"), $author->display_name) ) . '">' . $name . '</a>';

		if ( !empty( $feed_image ) || !empty( $feed ) ) {

			$link .= ' ';

			if ( empty( $feed_image ) ) {

				$link .= '(';

			}

			$link .= '<a href="' . get_author_feed_link( $author->ID ) . '"';

			$alt = $title = '';

			if ( !empty( $feed ) ) {

				$title = ' title="' . esc_attr( $feed ) . '"';

				$alt = ' alt="' . esc_attr( $feed ) . '"';

				$name = $feed;

				$link .= $title;

			}

			$link .= '>';

			if ( !empty( $feed_image ) )

				$link .= '<img src="' . esc_url( $feed_image ) . '" style="border: none;"' . $alt . $title . ' />';

			else

				$link .= $name;

			$link .= '</a>';

			if ( empty( $feed_image ) )

				$link .= ')';

		}

		if ( $optioncount )

			$link .= ' ('. $posts . ')';

		$return .= $link;

		$return .= ( 'list' == $style ) ? '</li>' : ', ';

	}

	$return = rtrim($return, ', ');

	if ( !$echo )

		return $return;

	echo $return;

}

/**

 * Does this site have more than one author

 *

 * Checks to see if more than one author has published posts.

 *

 * @since 3.2.0

 * @return bool Whether or not we have more than one author

 */

function is_multi_author() {

	global $wpdb;

	if ( false === ( $is_multi_author = wp_cache_get('is_multi_author', 'posts') ) ) {

		$rows = (array) $wpdb->get_col("SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 2");

		$is_multi_author = 1 < count( $rows ) ? 1 : 0;

		wp_cache_set('is_multi_author', $is_multi_author, 'posts');

	}

	return apply_filters( 'is_multi_author', (bool) $is_multi_author );

}

/**

 * Helper function to clear the cache for number of authors.

 *

 * @private

 */

function __clear_multi_author_cache() {

	wp_cache_delete('is_multi_author', 'posts');

}

add_action('transition_post_status', '__clear_multi_author_cache');