From fa754724e11867a5d45da846840b3c68bf330dc1 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Fri, 29 Sep 2017 10:18:11 +0000
Subject: [PATCH] Posts, Post Types: Introduce `pre_trash_post` and
 `pre_untrash_post` filters to allow for short-circuiting `wp_trash_post()`
 and `wp_untrash_post()`.

This brings parity with `pre_delete_post` filter in `wp_delete_post()`, introduced in [34082].

Props bor0.
Fixes #42030.

git-svn-id: https://develop.svn.wordpress.org/trunk@41638 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/post.php | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/wp-includes/post.php b/src/wp-includes/post.php
index 3ea40d59fc..5e6efb4cb1 100644
--- a/src/wp-includes/post.php
+++ b/src/wp-includes/post.php
@@ -2595,6 +2595,19 @@ function wp_trash_post( $post_id = 0 ) {
 	if ( $post['post_status'] == 'trash' )
 		return false;
 
+	/**
+	 * Filters whether a post trashing should take place.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param bool    $trash Whether to go forward with trashing.
+	 * @param WP_Post $post  Post object.
+	 */
+	$check = apply_filters( 'pre_trash_post', null, $post );
+	if ( null !== $check ) {
+		return $check;
+	}
+
 	/**
 	 * Fires before a post is sent to the trash.
 	 *
@@ -2639,6 +2652,19 @@ function wp_untrash_post( $post_id = 0 ) {
 	if ( $post['post_status'] != 'trash' )
 		return false;
 
+	/**
+	 * Filters whether a post untrashing should take place.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param bool    $untrash Whether to go forward with untrashing.
+	 * @param WP_Post $post    Post object.
+	 */
+	$check = apply_filters( 'pre_untrash_post', null, $post );
+	if ( null !== $check ) {
+		return $check;
+	}
+
 	/**
 	 * Fires before a post is restored from the trash.
 	 *