<?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;

	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 compatiability 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 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 ( $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;

	else

		$authordata = get_userdata( $user_id );

	$field = strtolower($field);

	$user_field = "user_$field";

	if ( 'id' == $field )

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

	elseif ( isset($authordata->$user_field) )

		$value = $authordata->$user_field;

	else

		$value = isset($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);

}

/**

 * 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_meta()

 * @uses the_author()

 */

function the_author_link() {

	if ( get_the_author_meta('url') ) {

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

	} else {

		the_author();

	}

}

/**

 * 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 get_usernumposts()

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

 */

function get_the_author_posts() {

	global $post;

	return get_usernumposts($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() Echos 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 = '') {

	global $authordata;

	$link = sprintf(

		'<a href="%1$s" title="%2$s">%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 of the author of the current post.

 *

 * @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 = get_option('home') . '/';

		$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);

		$link = get_option('home') . trailingslashit($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 for 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(

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

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

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

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

	);

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

	extract($r, EXTR_SKIP);

	$return = '';

	/** @todo Move select to get_authors(). */

	$authors = $wpdb->get_results("SELECT ID, user_nicename from $wpdb->users " . ($exclude_admin ? "WHERE user_login <> 'admin' " : '') . "ORDER BY display_name");

	$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 ( (array) $authors as $author ) {

		$link = '';

		$author = get_userdata( $author->ID );

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

		$name = $author->display_name;

		if ( $show_fullname && ($author->first_name != '' && $author->last_name != '') )

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

		if( !$html ) {

			if ( $posts == 0 ) {

				if ( ! $hide_empty )

					$return .= $name . ', ';

			} else

				$return .= $name . ', ';

			// No need to go further to process HTML.

			continue;

		}

		if ( !($posts == 0 && $hide_empty) && 'list' == $style )

			$return .= '<li>';

		if ( $posts == 0 ) {

			if ( ! $hide_empty )

				$link = $name;

		} else {

			$link = '<a href="' . get_author_posts_url($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) . '"';

				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 . ')';

		}

		if ( !($posts == 0 && $hide_empty) && 'list' == $style )

			$return .= $link . '</li>';

		else if ( ! $hide_empty )

			$return .= $link . ', ';

	}

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

	if ( ! $echo )

		return $return;

	echo $return;

}

?>