Bail out if running an autosave, ajax or a cron for use in save_post

bail.php

<?php

/** 
 * Bail out if running an autosave, ajax or a cron
 * or user does not have proper capabilities
 *
 * @return bool|int True if should bail, post ID if lacking cap
 */
function wps_bail( $post_id = '', $cap = 'edit_post' ) {
	/** Bail out if running an autosave */
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
		return true;
	/** Bail out if running an ajax */
	if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
		return true;
	/** Bail out if running a cron */
	if ( defined( 'DOING_CRON' ) && DOING_CRON )
		return true;
	/** Bail out if user does not have permissions */
	if ( '' != $post_id && ! current_user_can( $cap, $post_id ) )
		return $post_id;
	
	return false;
}

save-post.php

<?php

add_action( 'save_post', 'wps_save_worksheet_settings', 10, 2 );
/**
 * Save settings post meta fields added to Sermon metaboxes.
 *
 * @since 1.0.0
 *
 * @param int $post_id The post ID
 * @param object $post Current post object data
 */
function wps_save_worksheet_settings( $post_id, $post ) {

	/** Bail out if running an autosave, ajax or a cron */
	if ( wps_bail( $post_id ) ) return;

	// do stuff
}