Improve `get_post_permalink` compatibility with non standard post status

This adds a new filter named `get_post_status` to the function named `get_post_status` which can be used to make additional post types behave like unpublished post status in `get_post_permalink`.

Props misterbisson, antpb, iamfriendly
Fixes #23458


Built from https://develop.svn.wordpress.org/trunk@35233


git-svn-id: http://core.svn.wordpress.org/trunk@35199 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/link-template.php

@@ -259,7 +259,7 @@ function get_post_permalink( $id = 0, $leavename = false, $sample = false ) {
 
 	$slug = $post->post_name;
 
-	$draft_or_pending = isset( $post->post_status ) && in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft', 'future' ) );
+	$draft_or_pending = get_post_status( $id ) && in_array( get_post_status( $id ), array( 'draft', 'pending', 'auto-draft', 'future' ) );
 
 	$post_type = get_post_type_object($post->post_type);
 

wp-includes/post-functions.php

@@ -573,7 +573,14 @@ function get_post_status( $ID = '' ) {
 
 	}
 
-	return $post->post_status;
+	/**
+	 * Filters the post status.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string  $post->post_status The status of the post.
+	 */
+	return apply_filters( 'get_post_status', $post->post_status, $post );
 }
 
 /**

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-35232';
+$wp_version = '4.4-alpha-35233';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.