Ticket #12799: gallery shortcode replacement.txt

<?php
/*
Plugin Name: Alternate Gallery Shortcode
Plugin URI: http://davidtorbert.com
Description: Allows the gallery to be limited to a certain number of items.  This allows you to have a parent gallery page, which will link to the child galleries.  Note that this function is just a block copy of the gallery_shortcode() function from Wordpress with the addition of the maximum option to the [gallery] shortcode.  If/when Wordpress updates this function, we will need to update our's.
Version: 1.0
Author: David Torbert
Author URI: http://davidtorbert.com
*/


/**
 * The Gallery shortcode.
 *
 * This implements the functionality of the Gallery Shortcode for displaying
 * WordPress images on a post.
 *
 * @since 2.5.0
 *
 * @param array $attr Attributes attributed to the shortcode.
 * @return string HTML content to display gallery.
 */
function alt_gallery_shortcode($null, $attr = array()) {
        global $post, $wp_locale;

        static $instance = 0;
        $instance++;

        // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
        if ( isset( $attr['orderby'] ) ) {
                $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
                if ( !$attr['orderby'] )
                        unset( $attr['orderby'] );
        }

        extract(shortcode_atts(array(
                'order'      => 'ASC',
                'orderby'    => 'menu_order ID',
                'id'         => $post->ID,
                'itemtag'    => 'dl',
                'icontag'    => 'dt',
                'captiontag' => 'dd',
                'columns'    => 3,
                'size'       => 'thumbnail',
                'include'    => '',
                'exclude'    => '',
                'maximum'    => 0
        ), $attr));

        $id = intval($id);
        if ( 'RAND' == $order )
                $orderby = 'none';

        if ( !empty($include) ) {
                $include = preg_replace( '/[^0-9,]+/', '', $include );
                $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

                $attachments = array();
                foreach ( $_attachments as $key => $val ) {
                        $attachments[$val->ID] = $_attachments[$key];
                }
        } elseif ( !empty($exclude) ) {
                $exclude = preg_replace( '/[^0-9,]+/', '', $exclude );
                $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
        } else {
                $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
        }

        if ( empty($attachments) )
                return '';

        if ( is_feed() ) {
                $output = "\n";
                foreach ( $attachments as $att_id => $attachment )
                        $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
                return $output;
        }

        $itemtag = tag_escape($itemtag);
        $captiontag = tag_escape($captiontag);
        $columns = intval($columns);
        $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
        $float = $wp_locale->text_direction == 'rtl' ? 'right' : 'left'; 
        
        $selector = "gallery-{$instance}";

        $output = apply_filters('gallery_style', "
                <style type='text/css'>
                        #{$selector} {
                                margin: auto;
                        }
                        #{$selector} .gallery-item {
                                float: {$float};
                                margin-top: 10px;
                                text-align: center;
                                width: {$itemwidth}%;                   }
                        #{$selector} img {
                                border: 2px solid #cfcfcf;
                        }
                        #{$selector} .gallery-caption {
                                margin-left: 0;
                        }
                </style>
                <!-- see gallery_shortcode() in wp-includes/media.php -->
                <div id='$selector' class='gallery galleryid-{$id}'>");

        $i = 0;
        foreach ( $attachments as $id => $attachment ) {
                $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);

                $output .= "<{$itemtag} class='gallery-item'>";
                $output .= "
                        <{$icontag} class='gallery-icon'>
                                $link
                        </{$icontag}>";
                if ( $captiontag && trim($attachment->post_excerpt) ) {
                        $output .= "
                                <{$captiontag} class='gallery-caption'>
                                " . wptexturize($attachment->post_excerpt) . "
                                </{$captiontag}>";
                }
                $output .= "</{$itemtag}>";
                if ( $columns > 0 && ++$i % $columns == 0 )
                        $output .= '<br style="clear: both" />';
    if (($maximum != 0 && ($i >= $maximum))
    {
        break;
    }
        }

        $output .= "
                        <br style='clear: both;' />
                </div>\n";

        return $output;
}

add_filter('post_gallery', 'alt_gallery_shortcode', 10, 2);

?>