From 7f8efa896767ebf51cf317e0af00d4b735454899 Mon Sep 17 00:00:00 2001
From: Anthony Talarico <talarico@gaslightmedia.com>
Date: Fri, 4 Aug 2017 11:02:23 -0400
Subject: [PATCH] adding filter for advanced custom fields

adding page ancestor filter to custom fields plugin
---
 functions.php | 116 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 115 insertions(+), 1 deletion(-)

diff --git a/functions.php b/functions.php
index 7195fed..47a0bea 100644
--- a/functions.php
+++ b/functions.php
@@ -30,4 +30,118 @@ define("ECONOMIC_BLOCKS", 4327);
 
 define("DEFAULT_BLOCKS", 24);
 define("DEFAULT_SLIDER", 21);
-?>
\ No newline at end of file
+?>
+<?php
+/**
+ * Core Functionality Plugin
+ * 
+ * @package    CoreFunctionality
+ * @since      1.0.0
+ * @copyright  Copyright (c) 2014, Bill Erickson & Jared Atchison
+ * @license    GPL-2.0+
+ */
+/**
+ * ACF Rule Type: Page Ancestor
+ *
+ * @author Bill Erickson
+ * @see http://www.billerickson.net/acf-custom-location-rules
+ *
+ * @param array $choices, all of the available rule types
+ * @return array
+ */
+function ea_acf_rule_type_page_ancestor( $choices ) {
+	$choices['Page']['page_ancestor'] = 'Page Ancestor';
+	return $choices;
+}
+add_filter( 'acf/location/rule_types', 'ea_acf_rule_type_page_ancestor' );
+/**
+ * ACF Rule Values: Page Ancestor
+ *
+ * @author Bill Erickson
+ * @see http://www.billerickson.net/acf-custom-location-rules
+ *
+ * @param array $choices, available rule values for this type
+ * @return array
+ */
+function ea_acf_rule_values_page_ancestor( $choices ) {
+	// Copied from acf/core/controllers/field_group.php
+	// @see https://github.com/elliotcondon/acf/blob/8ffdf88889c8c81e7f628e8e1ef95c6de17eb02d/core/controllers/field_group.php#L580
+	
+	$post_type = 'page';
+	$posts = get_posts(array(
+		'posts_per_page'			=>	-1,
+		'post_type'					=> $post_type,
+		'orderby'					=> 'menu_order title',
+		'order'						=> 'ASC',
+		'post_status'				=> 'any',
+		'suppress_filters'			=> false,
+		'update_post_meta_cache'	=> false,
+	));
+	
+	if( $posts )
+	{
+		// sort into hierachial order!
+		if( is_post_type_hierarchical( $post_type ) )
+		{
+			$posts = get_page_children( 0, $posts );
+		}
+		
+		foreach( $posts as $page )
+		{
+			$title = '';
+			$ancestors = get_ancestors($page->ID, 'page');
+			if($ancestors)
+			{
+				foreach($ancestors as $a)
+				{
+					$title .= '- ';
+				}
+			}
+			
+			$title .= apply_filters( 'the_title', $page->post_title, $page->ID );
+			
+			
+			// status
+			if($page->post_status != "publish")
+			{
+				$title .= " ($page->post_status)";
+			}
+			
+			$choices[ $page->ID ] = $title;
+			
+		}
+	
+	}
+	
+	return $choices;
+}
+add_filter( 'acf/location/rule_values/page_ancestor', 'ea_acf_rule_values_page_ancestor' );
+/**
+ * ACF Rule Match: Page Ancestor
+ *
+ * @author Bill Erickson
+ * @see http://www.billerickson.net/acf-custom-location-rules
+ *
+ * @param boolean $match, whether the rule matches (true/false)
+ * @param array $rule, the current rule you're matching. Includes 'param', 'operator' and 'value' parameters
+ * @param array $options, data about the current edit screen (post_id, page_template...)
+ * @return boolean $match
+ */
+function ea_acf_rule_match_page_ancestor( $match, $rule, $options ) {
+	
+	if ( ! $options['post_id'] || 'page' !== get_post_type( $options['post_id'] ) )
+		return false;
+		
+	$ancestors = get_ancestors( $options['post_id'], 'page' );
+	$is_ancestor = in_array( $rule['value'], $ancestors );
+	
+	if ( '==' == $rule['operator'] ) { 
+		$match = $is_ancestor;
+	
+	} elseif ( '!=' == $rule['operator'] ) {
+		$match = ! $is_ancestor;
+	}
+	
+	return $match;
+}
+add_filter( 'acf/location/rule_match/page_ancestor', 'ea_acf_rule_match_page_ancestor', 10, 3 );
\ No newline at end of file
-- 
2.17.1