wp-bootstrap/wp-bootstrap-gallery

<?php
/**
 * WP Bootstrap Navwalker
 *
 * @package WP-Bootstrap-Navwalker
 */

/**
 * Class Name: wp_bootstrap_gallery
 * Plugin Name: WP Bootstrap Navwalker
 * Plugin URI: https://github.com/wp-bootstrap/wp-bootstrap-gallery
 * Description: A custom Wordpress gallery for dynamic thumbnail layout using Twitter Bootstrap 2 thumbnail layouts.
 * Version: 1.0.1
 * Author: Edward McIntyre - @twittem, Brandon Hubbard
 * GitHub URI: https://github.com/wp-bootstrap/wp-bootstrap-gallery
 * GitHub Plugin URI: https://github.com/wp-bootstrap/wp-bootstrap-gallery
 * GitHub Branch: master
 * License: GPL-3.0+
 * License URI: https://www.gnu.org/licenses/gpl-3.0.txt
 */

/**
 * WP Bootstrap Gallery.
 *
 * @access public
 * @param mixed $content Content.
 * @param mixed $attr Attributes.
 * @return void
 */
function wp_bootstrap_gallery( $content, $attr ) {
    global $instance, $post;
    $instance++;

    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'        => 'figure',
        'icontag'        => 'div',
        'captiontag'    => 'figcaption',
        'columns'        => 3,
        'size'            => 'thumbnail',
        'include'        => '',
        'exclude'        => '',
    ), $attr ) );

    $id = intval( $id );

    if ( 'RAND' === $order ) {
        $orderby = 'none';
    }

    if ( $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 ( $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( min( array( 8, $columns ) ) );
    $float        = (is_rtl()) ? 'right' : 'left';

    $selector    = "gallery-{$instance}";
    $size_class    = sanitize_html_class( $size );
    $output        = "<div class='row' id='$selector'>";

    /**
         * Count number of items in $attachments array, and assign a colum layout to $span_array
         * variable based on the mumber of images in the $attachments array
     */
    $span_array = null;

    switch ( count( $attachments ) ) {
        case 1:
            /* One full width image. */
            $span_array = array( 12 );
            break;
        case 2:
            /* Two half width images. */
            $span_array = array( 6,6 );
            break;
        case 3:
            /* One 3/4 width image with two 1/4 width images to the right. */
            $span_array = array( 8,4,4 );
            break;
        case 4:
            /* One full width image with three 1/3 width images underneath. */
            $span_array = array( 12,4,4,4 );
            break;
        case 5:
            /* Two half width images with fout 1/4 width images underneath. */
            $span_array = array( 6,6,4,4,4 );
            break;
        case 6:
            /* One 2/3 width image with two 1/3 width images to the right, and three 1/3 width images underneath. */
            $span_array = array( 8,4,4,4,4,4 );
            break;
        default:
            /* One full width image with two 1/2 width images underneath. All remaining images 1/3 width underneath. */
            $span_array = array( 12,6,6,4 );
            break;
    }

    $attachment_count = 0;

    foreach ( $attachments as $id => $attachment ) {

        $attachment_image = wp_get_attachment_image( $id, 'full' );
        $attachment_link = wp_get_attachment_link( $id, 'full', ! ( isset( $attr['link'] ) and 'file' === $attr['link'] ) );

        $output .= "<div class='span" . $span_array[ $attachment_count ] . "'>";
        $output .= $attachment_link . "\n";
        $output .= "</div>\n";

        if ( count( $attachments ) >= 7 && 3 === $attachment_count ) {
            $attachment_count = 3;
        } else {
            $attachment_count++;
        }
    }

    $output .= "</div>\n";

    return $output;
}

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