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<?php

function get_coauthors( $post_id = 0, $args = array() ) {
global $post, $post_ID, $coauthors_plus, $wpdb;

$coauthors = array();
$post_id = (int)$post_id;
if ( !$post_id && $post_ID )
$post_id = $post_ID;
if ( !$post_id && $post )
$post_id = $post->ID;

$defaults = array('orderby'=>'term_order', 'order'=>'ASC');
$args = wp_parse_args( $args, $defaults );

if ( $post_id ) {
$coauthor_terms = wp_get_post_terms( $post_id, $coauthors_plus->coauthor_taxonomy, $args );

if ( is_array( $coauthor_terms ) && !empty( $coauthor_terms ) ) {
foreach( $coauthor_terms as $coauthor ) {
$post_author = get_user_by( 'login', $coauthor->name );
// In case the user has been deleted while plugin was deactivated
if ( !empty( $post_author ) )
$coauthors[] = $post_author;
}
} else {
if ( $post ) {
$post_author = get_userdata( $post->post_author );
} else {
$post_author = get_userdata( $wpdb->get_var( $wpdb->prepare("SELECT post_author FROM $wpdb->posts WHERE ID = %d", $post_id ) ) );
}
if ( !empty( $post_author ) )
$coauthors[] = $post_author;
}
}
return $coauthors;
}

/**
* Checks to see if the the specified user is author of the current global post or post (if specified)
* @param object|int $user
* @param int $post_id
*/
function is_coauthor_for_post( $user, $post_id = 0 ) {
global $post;

if( ! $post_id && $post )
$post_id = $post->ID;
if( ! $post_id )
return false;

$coauthors = get_coauthors( $post_id );
if ( is_numeric( $user ) ) {
$user = get_userdata( $user );
$user = $user->user_login;
}

foreach( $coauthors as $coauthor ) {
if ( $user == $coauthor->user_login )
return true;
}
return false;
}

class CoAuthorsIterator {
var $position = -1;
var $original_authordata;
var $current_author;
var $authordata_array;
var $count;

function CoAuthorsIterator( $postID = 0 ){
global $post, $authordata, $wpdb;
$postID = (int)$postID;
if( !$postID && $post )
$postID = (int)$post->ID;
if( !$postID )
trigger_error(__('No post ID provided for CoAuthorsIterator constructor. Are you not in a loop or is $post not set?', 'co-authors-plus')); //return null;

$this->original_authordata = $this->current_author = $authordata;
$this->authordata_array = get_coauthors( $postID );

$this->count = count($this->authordata_array);
}

function iterate(){
global $authordata;
$this->position++;

//At the end of the loop
if( $this->position > $this->count-1 ){
$authordata = $this->current_author = $this->original_authordata;
$this->position = -1;
return false;
}

//At the beginning of the loop
if( $this->position == 0 && !empty( $authordata ) )
$this->original_authordata = $authordata;

$authordata = $this->current_author = $this->authordata_array[$this->position];

return true;
}

function get_position(){
if ( $this->position === -1 )
return false;
return $this->position;
}
function is_last(){
return $this->position === $this->count-1;
}
function is_first(){
return $this->position === 0;
}
function count(){
return $this->count;
}
function get_all(){
return $this->authordata_array;
}
}

//Helper function for the following new template tags
function coauthors__echo( $tag, $type = 'tag', $separators = array(), $tag_args = null, $echo = true ) {

// Define the standard output separator. Constant support is for backwards compat.
// @see https://github.com/danielbachhuber/Co-Authors-Plus/issues/12
$default_before = ( defined( 'COAUTHORS_DEFAULT_BEFORE' ) ) ? COAUTHORS_DEFAULT_BEFORE : '';
$default_between = ( defined( 'COAUTHORS_DEFAULT_BETWEEN' ) ) ? COAUTHORS_DEFAULT_BETWEEN : ', ';
$default_between_last = ( defined( 'COAUTHORS_DEFAULT_BETWEEN_LAST' ) ) ? COAUTHORS_DEFAULT_BETWEEN_LAST : __( ' and ', 'co-authors-plus' );
$default_after = ( defined( 'COAUTHORS_DEFAULT_AFTER' ) ) ? COAUTHORS_DEFAULT_AFTER : '';

if( ! isset( $separators['before'] ) || $separators['before'] === NULL )
$separators['before'] = apply_filters( 'coauthors_default_before', $default_before );
if( ! isset( $separators['between'] ) || $separators['between'] === NULL )
$separators['between'] = apply_filters( 'coauthors_default_between', $default_between );
if( ! isset( $separators['betweenLast'] ) || $separators['betweenLast'] === NULL )
$separators['betweenLast'] = apply_filters( 'coauthors_default_between_last', $default_between_last );
if( ! isset( $separators['after'] ) || $separators['after'] === NULL )
$separators['after'] = apply_filters( 'coauthors_default_after', $default_after );

$output = '';

$i = new CoAuthorsIterator();
$output .= $separators['before'];
$i->iterate();
do {
$author_text = '';

if( $type == 'tag' )
$author_text = $tag( $tag_args );
elseif( $type == 'field' && isset( $i->current_author->$tag ) )
$author_text = $i->current_author->$tag;
elseif( $type == 'callback' && is_callable( $tag ) )
$author_text = call_user_func( $tag, $i->current_author );

// Fallback to user_login if we get something empty
if( empty( $author_text ) )
$author_text = $i->current_author->user_login;

// Append separators
if ( ! $i->is_first() && $i->count() > 2 )
$output .= $separators['between'];

if ( $i->is_last() && $i->count() > 1 ) {
$output = rtrim( $output, ' ' );
$output .= ' ' . $separators['betweenLast'];
}

$output .= $author_text;
} while( $i->iterate() );

$output .= $separators['after'];

if( $echo )
echo $output;

return $output;
}

//Provide co-author equivalents to the existing author template tags
function coauthors( $between = null, $betweenLast = null, $before = null, $after = null, $echo = true ){
return coauthors__echo('display_name', 'field', array(
'between' => $between,
'betweenLast' => $betweenLast,
'before' => $before,
'after' => $after
), null, $echo );
}
function coauthors_posts_links( $between = null, $betweenLast = null, $before = null, $after = null, $echo = true ){
return coauthors__echo('coauthors_posts_links_single', 'callback', array(
'between' => $between,
'betweenLast' => $betweenLast,
'before' => $before,
'after' => $after
), null, $echo );
}
function coauthors_posts_links_single( $author ) {
return sprintf(
'<a href="%1$s" title="%2$s">%3$s</a>',
get_author_posts_url( $author->ID, $author->user_nicename ),
esc_attr( sprintf( __( 'Posts by %s', 'co-authors-plus' ), get_the_author() ) ),
get_the_author()
);
}

function coauthors_firstnames($between = null, $betweenLast = null, $before = null, $after = null, $echo = true ){
return coauthors__echo('get_the_author_meta', 'tag', array(
'between' => $between,
'betweenLast' => $betweenLast,
'before' => $before,
'after' => $after
), 'first_name', $echo );
}
function coauthors_lastnames($between = null, $betweenLast = null, $before = null, $after = null, $echo = true ) {
return coauthors__echo('get_the_author_meta', 'tag', array(
'between' => $between,
'betweenLast' => $betweenLast,
'before' => $before,
'after' => $after
), 'last_name', $echo );
}
function coauthors_nicknames($between = null, $betweenLast = null, $before = null, $after = null, $echo = true ) {
return coauthors__echo('get_the_author_meta', 'tag', array(
'between' => $between,
'betweenLast' => $betweenLast,
'before' => $before,
'after' => $after
), 'nickname', $echo );
}
function coauthors_links($between = null, $betweenLast = null, $before = null, $after = null, $echo = true ) {
return coauthors__echo('coauthors_links_single', 'callback', array(
'between' => $between,
'betweenLast' => $betweenLast,
'before' => $before,
'after' => $after
), null, $echo );
}
function coauthors_links_single( $author ) {
if ( get_the_author_meta('url') ) {
return sprintf( '<a href="%s" title="%s" rel="external">%s</a>',
get_the_author_meta('url'),
esc_attr( sprintf(__("Visit %s&#8217;s website"), get_the_author()) ),
get_the_author()
);
} else {
return get_the_author();
}
}
function coauthors_IDs($between = null, $betweenLast = null, $before = null, $after = null, $echo = true ) {
return coauthors__echo('ID', 'field', array(
'between' => $between,
'betweenLast' => $betweenLast,
'before' => $before,
'after' => $after
), null, $echo );
}

function get_the_coauthor_meta( $field ) {
global $wp_query, $post;

$coauthors = get_coauthors();
$meta = array();

foreach( $coauthors as $coauthor ) {
$user_id = $coauthor->ID;
$meta[$user_id] = get_the_author_meta( $field, $user_id );
}
return $meta;
}

function the_coauthor_meta( $field, $user_id = 0 ) {
// TODO: need before after options
echo get_the_coauthor_meta($field, $user_id);
}

/**
* List all the *co-authors* of the blog, with several options available.
* optioncount (boolean) (false): Show the count in parenthesis next to the author's name.
* exclude_admin (boolean) (true): Exclude the 'admin' user that is installed by default.
* show_fullname (boolean) (false): Show their full names.
* hide_empty (boolean) (true): Don't show authors without any posts.
* feed (string) (''): If isn't empty, show links to author's feeds.
* feed_image (string) (''): If isn't empty, use this image to link to feeds.
* echo (boolean) (true): Set to false to return the output, instead of echoing.
* @param array $args The argument array.
* @return null|string The output, if echo is set to false.
*
* NOTE: This is not perfect and probably won't work that well.
*
*/

function coauthors_wp_list_authors($args = '') {
global $wpdb, $coauthors_plus;

$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 = '';

$authors = $coauthors_plus->search_authors();
$author_terms = get_terms( 'author' );

foreach ( (array) $author_terms as $author_term ) {
$author_count[$author_term->slug] = $author_term->count;
}

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

$link = '';

$author = get_userdata( $author->ID );
$posts = (isset($author_count[$author->user_login])) ? $author_count[$author->user_login] : 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", 'co-authors-plus'), $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;
}
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