Gallery Shortcode

gistfile1.php

/**
 * Agility's Gallery shortcode, implemented by filter
 */
add_filter( 'post_gallery', 'agility_gallery_shortcode', 10, 2 );

function agility_gallery_shortcode( $output, $attr ) {
	global $post;

	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'    => 'div',
		'icontag'    => 'div',
		'captiontag' => 'span',
		'columns'    => 3,
		'size'       => 'large',
		'include'    => '',
		'exclude'    => '',
		'lightbox'	 =>	'on',
		'caption'	 => 'off',
	), $attr) );

	$gallery_id = intval($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' => $gallery_id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
	} else {
		$attachments = get_children( array('post_parent' => $gallery_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 = is_rtl() ? 'right' : 'left';

	$selector = "gallery-{$instance}";

	$gallery_style = $gallery_div = '';
	
	$size_class = sanitize_html_class( $size );
	$gallery_div = "<div id='$selector' class='gallery galleryid-{$gallery_id} gallery-columns-{$columns} gallery-size-{$size_class} clearfix'>";
	$output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );

	$i = 0;
	$cols = agility_one_over( $columns );
	
	$output.= '<div class="row">';

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

		if( $lightbox == 'on' ){
			$id = intval( $id );
			$_post = & get_post( $id );

			if ( empty( $_post ) || ( 'attachment' != $_post->post_type ) || ! $url = wp_get_attachment_url( $_post->ID ) ){
				$link = __( 'Missing Attachment', 'agility' );
			}
			else{
				
				$post_title = esc_attr( $_post->post_title );

				if ( $size && 'none' != $size )
					$link_text =  wp_get_attachment_image( $id, $size, false, array( 'alt' => $post_title, 'class' => "attachment-$size scale-with-grid" ) );
				else
					$link_text = '';

				if ( trim( $link_text ) == '' )
					$link_text = $_post->post_title;

				$link = '<a href="'.$url.'" data-rel="prettyPhoto[gallery-'.$gallery_id.']" title="'.strip_tags( $attachment->post_excerpt ).'">'.$link_text.'</a>';
			}
		}	
		else{
			$link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);
		}

		$class = "one-$cols column";
		if( $i % $columns == 0 ) $class.= ' alpha';
		else if( ( $i + 1) % $columns == 0 ) $class.= ' omega';

		$output .= "<{$itemtag} class='gallery-item $class'>";
		$output .= 
			"<{$icontag} class='gallery-icon'>$link</{$icontag}>";
		if ( $caption == 'on' && $captiontag && trim($attachment->post_excerpt) ) {
			$output .= 
				"<{$captiontag} class='wp-caption-text gallery-caption'>" . 
				wptexturize($attachment->post_excerpt) . 
				"</{$captiontag}>";
		}
		$output .= "</{$itemtag}>";
		if ( $columns > 0 && ++$i % $columns == 0 )
			$output .= '</div><div class="row">';
	}

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

	return $output;

}