themes-wordpress/altofocus/inc/extras.php

<?php
/**
 * Custom functions that act independently of the theme templates.
 *
 * Eventually, some of the functionality here could be replaced by core features.
 *
 * @package AltoFocus
 */

/**
 * Adds custom classes to the array of body classes.
 *
 * @param array $classes Classes for the body element.
 * @return array
 */
function altofocus_body_classes( $classes ) {

	// Add class if no custom header or featured images
	$header_image = get_header_image();

	// Header text display class, determines size of logo
	$header_text_display = get_theme_mod( 'header_textcolor' );

	if ( $header_text_display == 'blank' ) {

		$classes[] = 'hide-site-title-description';
	}

	// Add class if footer image has been added
	$media_override = get_theme_mod( 'altofocus_media_override' );

	if ( $media_override == 'override' && is_singular() ) {

		$classes[] = 'media-override';
	}

	// Adds a class of group-blog to blogs with more than 1 published author.
	if ( is_multi_author() ) {

		$classes[] = 'group-blog';
	}

	// Adds a class of hfeed to non-singular pages.
	if ( ! is_singular() ) {

		$classes[] = 'hfeed';
	}

	// Add a class of no-sidebar when there is no sidebar present
	if ( ! is_active_sidebar( 'sidebar-1' ) ) {

		$classes[] = 'no-sidebar';
	}

	return $classes;
}
add_filter( 'body_class', 'altofocus_body_classes' );

/**
 * Adds custom classes to the array of post classes.
 *
 * @param array $classes Classes for the article element.
 * @return array
 */
function altofocus_post_classes( $classes ) {

	global $post, $content_width;

	// Use 1/2 of the $content_width variable as the threshold for images that are too small
	$image_size_threshhold = $content_width / 2;

	if ( ! is_singular() ) {

		$classes[] = 'grid-item';

		// Get image meta
		$image_meta  = wp_get_attachment_metadata( get_post_thumbnail_id( $post->ID ) );

		// Set orientation and image constraint classes
		if ( isset( $image_meta['width'], $image_meta['height'] ) ) {

			// Use small classes when original image size is too small
			if ( $image_meta['width'] <= $image_size_threshhold || $image_meta['height'] <= $image_size_threshhold ) {

				$classes[] = 'grid-item-small';
			}

			// Use small class to make the grid-item images size conform to post-title size instead of image size
			if ( ( $image_meta['width'] > $image_meta['height'] ) &&
			   ( ( $image_meta['width'] / $image_meta['height'] ) <= 1 ) ) {

				$classes[] = 'grid-item-small';
			}

			// Landscape images
			if ( $image_meta['width'] >= $image_meta['height'] ) {

				$classes[] = 'grid-item-landscape';

			// Portrait images
			} else {

				$classes[] = 'grid-item-portrait';
			}
		}

		// Get featured content settings and options
		$featured_options  = get_option( 'featured-content' );
		$featured_tag_name = isset( $featured_options['tag-name'] ) ? $featured_options['tag-name'] : '';

		if ( ! empty( $featured_tag_name ) && has_tag( $featured_tag_name, $post->ID ) ) {

			$classes[] = 'grid-item-featured';
		}
	}

	return $classes;
}
add_filter( 'post_class', 'altofocus_post_classes' );

/**
 * Add a pingback url auto-discovery header for singularly identifiable articles.
 */
function altofocus_pingback_header() {

	if ( is_singular() && pings_open() ) {
		echo '<link rel="pingback" href="', esc_url( get_bloginfo( 'pingback_url' ) ), '">';
	}
}
add_action( 'wp_head', 'altofocus_pingback_header' );

/**
 * Slideshow Gallery Filter
 *
 * Replaces the default gallery when type=slideshow is used
 * See: componenets/post/content-single.php
 * Source: https://wordpress.stackexchange.com/a/64022
 */
function altofocus_slideshow_gallery_filter( $output, $attr ) {

	global $post;
	
	static $count = 0;
	
	if ( $count > 0 ) {
		return $output; // Ensure the gallery output is replaced once.
	}

	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'    => 'li',
		'icontag'    => null,
		'captiontag' => 'p',
		'columns'    => 3,
		'size'       => 'large',
		'include'    => '',
		'exclude'    => ''
	), $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 '';
	}

	// The gallery output
	$selector = "gallery-{$instance}";
	$size_class = sanitize_html_class( $size );
	$output = "<section id=\"gallery-{$id}\" class=\"entry-gallery\"><div id=\"$selector\" class=\"flexslider slider slider-size-{$size_class}\"><ul class=\"slides\">";
	foreach ( $attachments as $att_id => $attachment ) {

		// Get image, meta & caption
		$image_link = wp_get_attachment_image( $att_id, $size );
		$image_meta  = wp_get_attachment_metadata( $att_id );
		$image_caption = $attachment->post_excerpt;

		// Set orientation
		$orientation = '';
		if ( isset( $image_meta['height'], $image_meta['width'] ) )
			$orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';

		// Image markup
		$output .= "<{$itemtag} class=\"slide {$orientation}\">";
		$output .= $image_link;

		// Add caption if it exists
		if ( ! empty( $image_caption ) )
			$output .= '<span class="image-caption">' . $image_caption . '</span>';

		$output .= "</{$itemtag}>";
	}

	$output .= '</section>';
	
	$count++; // Update counter after successful replacement.
	
	return $output;
}