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

/**
 * Get our wp_nav_menu() fallback, wp_page_menu(), to show a home link.
 */
function panaroma_page_menu_args( $args ) {
	$args['show_home'] = true;
	return $args;
}
add_filter( 'wp_page_menu_args', 'panaroma_page_menu_args' );

/**
 * Adds custom classes to the array of body classes.
 */
function panaroma_body_classes( $classes ) {
	// Adds a class of group-blog to blogs with more than 1 published author
	if ( is_multi_author() ) {
		$classes[] = 'group-blog';
	}

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

/**
 * Filter in a link to a content ID attribute for the next/previous image links on image attachment pages
 */
function panaroma_enhanced_image_navigation( $url, $id ) {
	if ( ! is_attachment() && ! wp_attachment_is_image( $id ) )
		return $url;

	$image = get_post( $id );
	if ( ! empty( $image->post_parent ) && $image->post_parent != $id )
		$url .= '#main';

	return $url;
}
add_filter( 'attachment_link', 'panaroma_enhanced_image_navigation', 10, 2 );

/**
 * Filters wp_title to print a neat <title> tag based on what is being viewed.
 */


/**
 * Sets the authordata global when viewing an author archive.
 *
 * This provides backwards compatibility with
 * http://core.trac.wordpress.org/changeset/25574
 *
 * It removes the need to call the_post() and rewind_posts() in an author
 * template to print information about the author.
 *
 * @global WP_Query $wp_query WordPress Query object.
 * @return void
 */
function panaroma_setup_author() {
	global $wp_query;

	if ( $wp_query->is_author() && isset( $wp_query->post ) ) {
		$GLOBALS['authordata'] = get_userdata( $wp_query->post->post_author );
	}
}
add_action( 'wp', 'panaroma_setup_author' );