wp-bootstrap-gallery.php

<?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 );