<?php
/**
 * Functions which enhance the theme by hooking into WordPress
 *
 * @package lively
 */

/**
 * Adds custom classes to the array of body classes.
 *
 * @param array $classes Classes for the body element.
 * @return array
 */
function lively_body_classes( $classes ) {
	// Adds a class of hfeed to non-singular pages.
	if ( ! is_singular() ) {
		$classes[] = 'hfeed';
	}

	// Adds 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', 'lively_body_classes' );

/**
 * Grid classes for the content column.
 *
 * The left panel is offset out of the way in either case; the content column
 * gives up three of its nine columns when the sidebar has something to show.
 *
 * @return string Space-separated grid classes.
 */
function lively_main_column_class() {
	$classes = is_active_sidebar( 'sidebar-1' ) ? 'col-lg-6 offset-lg-3' : 'col-lg-9 offset-lg-3';

	return apply_filters( 'lively_main_column_class', $classes );
}

/**
 * Add a pingback url auto-discovery header for single posts, pages, or attachments.
 */
function lively_pingback_header() {
	if ( is_singular() && pings_open() ) {
		printf( '<link rel="pingback" href="%s">', esc_url( get_bloginfo( 'pingback_url' ) ) );
	}
}
add_action( 'wp_head', 'lively_pingback_header' );
