series-display.php

<?php 
function series_get_thumbnail_img($the_post){
    if (has_post_thumbnail($the_post->ID)) {
        $attr = array(
            'alt' => esc_attr(wptexturize($the_post->post_title)),
            'title' => false
        );
        $img = get_the_post_thumbnail($the_post->ID, 'thumbnail', $attr);
        return $img;
    }
    //$img = '<img src="'. esc_attr(series_get_default_thumbnail_url($the_post->ID)) . '" alt="' . esc_attr(wptexturize($the_post->post_title)) . '" />';
    //return $img;
}

function series_get_adjacent_post_nav($format, $link, $post, $previous = true){
    if ( !$post )
        return;

    $title = get_the_title( $post->ID );
    $text = $previous ? __('Previous Post') : __('Next Post');
    
    $rel = $previous ? 'prev' : 'next';
    $string = '<a href="'.get_permalink( $post->ID, false ).'" rel="'.$rel.'" title="'.$title.'">';
    $link = str_replace('%title', $title, $link);
    $link = str_replace('%rel', $text, $link);
    
    $link = $string . $link . '</a>';
    $format = str_replace('%link', $link, $format);
    
    return $format;
}

function series_get_the_excerpt( $the_post ){

    return $the_post->post_excerpt;
}
/**
 * $series_arg = array(
         //come from settings option
        'title_format'   => __('This entry is part %current of %count in the series: %link', SERIES_BASE),
        'class_prefix'   => 'post-series',
        'series_wrap'    => 'section',
        'title_wrap'     => 'h3',
        'show_future'    => true,
        'auto_display'   => 0,
        'custom_styles'  => false, //not used here
        'show_thumbnail' => false,
        'show_excerpt'   => false,
        'show_nav'       => false,
        'loop_display'   => false,
        
        //come from widget or shortcode
        "slug" => '',
        "id" => '',
        "title" => '', //should have!
        "limit" => -1,
        'auto_hide'=> true,//original "show_all" used by loop display, now also in content
        "show_future" => true, // ovrrides
        "class_prefix" => $class_prefix, //must have! ovrrides
        "show_nav" => false, // ovrrides
        "title_format" => '' // ovrrides
    );
*/
function series_display($series_arg){
    global $post;
    
    extract($series_arg);
    
    $current_post_id = $post->ID;
    if(isset($id) && $id) {
        // Use the "id" attribute if it exists
        $tax_query = array(array('taxonomy' => SERIES, 'field' => 'id', 'terms' => $id));
        $tax_link = get_term_link((int)$id, SERIES);
        $term = get_term((int)$id, SERIES);
        
    } else if (isset($slug) && $slug) {
        // Use the "slug" attribute if "id" does not exist
        $tax_query = array(array('taxonomy' => SERIES, 'field' => 'slug', 'terms' => $slug));
        $tax_link = get_term_link($slug, SERIES);
        $term = get_term_by('slug', $slug, SERIES);
        
    } else {
        // Use post's own Series tax if neither "id" nor "slug" exist
        $terms = get_the_terms($current_post_id,SERIES);
        if ($terms && !is_wp_error($terms)) {
            $term = array_shift($terms);
            $tax_query = array(array('taxonomy' => SERIES, 'field' => 'slug', 'terms' => $term->slug));
            $tax_link = get_term_link($term->slug, SERIES);
        } else {
          return;
        }
    }
    if($show_future) {
        // Include the future posts if the "future" attribute is set to "on"
        $post_status = 'any'; //array('publish','future','draft');
    } else {
        // Exclude the future posts if the "future" attribute is set to "off"
        $post_status = 'publish';
    }
    
    $args = array(
        'tax_query' => $tax_query,
        'posts_per_page' => $limit,
        'orderby' => 'menu_order', //date
        'order' => 'ASC',
        'post_type'=> series_posttype_support(),
        'post_status' => $post_status
    );
    $the_posts = get_posts($args);
    /* if there's more than one post with the specified "series" taxonomy, display the list */
    if(($count = count($the_posts)) >= 1) {
        //display section
        $section_output = '<'.$series_wrap.' class="'.$class_prefix.'">';
        // create the list tag - notice the "post-series-list" class
        $output = '<ul class="'.$class_prefix.'-list"' . (isset($autohide) && $autohide ? ' style="display:none;">' : '>' );
        // the loop to list the posts
        $iterator=1;
        $prev_post = $next_post = null;
        foreach($the_posts as $the_post) {
            setup_postdata($the_post);
            if($the_post->post_status == 'publish') {
                if($the_post->ID == $current_post_id){
                    $output .= '<li class="'.$class_prefix.'-item-current '.$class_prefix.'-item">'
                    .'<span class="'.$class_prefix.'-item-title">'.get_the_title($the_post->ID).'</span>';
                    $current = $iterator;
                    $prev_post = (isset($tmp_post)?$tmp_post:null);
                } else{
                    $output .= '<li class="'.$class_prefix.'-item"><span class="'.$class_prefix.'-item-title">'
                    .'<a href="'. get_permalink($the_post->ID) .'">'.get_the_title($the_post->ID).'</a></span>';
                    $tmp_post = $the_post;//for prev post
                    if(isset($current)&&($iterator - $current == 1)){
                        $next_post = $tmp_post;
                    }
                }
            } else {
                /* we can't link the post if the post is not published yet! */
                $output .= '<li class="'.$class_prefix.'-item-future '.$class_prefix.'-item"><span class="'.$class_prefix.'-item-title">'
                .__('Future post',SERIES_BASE).': '.get_the_title($the_post->ID).'</span>';
            }
            $iterator++;
            
            $output .= ($show_thumbnail?'<p class="'.$class_prefix.'-item-thumbnail">'.series_get_thumbnail_img($the_post).'</p>':'');
            $output .= ($show_excerpt?'<p class="'.$class_prefix.'-item-excerpt">'.series_get_the_excerpt($the_post).'</p>':'');
            
            $output .= '</li>';
        }
        wp_reset_query();
        // close the list tag...
        $output .= '</ul>';
        if($show_nav){
            $output .= '<nav class="'.$class_prefix.'-nav">';
            if($prev_post){
                $output .= '<span class="'.$class_prefix.'-nav-prev">'. series_get_adjacent_post_nav('&laquo; %link', '%rel', $prev_post). '</span>';
            }
            
            if($next_post){
                $output .= '<span class="'.$class_prefix.'-nav-next">'. series_get_adjacent_post_nav('%link &raquo;', '%rel', $next_post, false). '</span>';
            }
            $output .= '</nav>';
        }
        //close section tag...
        $output .= '</'.$series_wrap.'>';
        //Create the title if the "title" attribute exists
        $link = sprintf('<a href="%1$s">%2$s</a>', $tax_link, isset($title)?$title:$term->name);
        //for widget display
        $title_output = '';
        if($title_wrap != ''){ 
            if($current && isset($title_format)){     
                $title_format = __( $title_format, SERIES_BASE );
                $title_format = str_replace( '%current', $current, $title_format );
                $title_format = str_replace( '%count', $count, $title_format );
                $title_format = str_replace( '%link', $link, $title_format );
                if( isset($auto_hide) && $auto_hide ){
                    //$title_format .= '<a href="JavaScript:void(0);" class="show-all">'.__('Show All', SERIES_BASE).'</a>';
                    $title_format = '<a href="JavaScript:void(0);" style="text-decoration:none;" class="autohide"><span class="icon-plus-square-o"></span></a> ' . $title_format;
                }

                $title_output = '<'.$title_wrap.' class="'.$class_prefix.'-title">'.$title_format.'</'.$title_wrap.'>';
            }else{
                $title_output = '<'.$title_wrap.' class="'.$class_prefix.'-title">'.$link.'</'.$title_wrap.'>';
            }
        }
        
        // display the title first
        $output = $section_output.$title_output.$output;
        // ...and return the whole output!
        return $output;
    }
}

//https://developer.wordpress.org/reference/functions/wp_list_categories/
function series_list_display($list_arg){
    $cat_args = array(
        'orderby'      => 'name',
        'show_count'   => $list_arg['count'],
        'hierarchical' => $list_arg['hierarchical'],
        'title_li' => '',
        'echo' => false,
        'taxonomy' => SERIES
    );

    $output = wp_list_categories($cat_args);
    return "<ul>" .$output ."</ul>";
}

?>