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Merge pull request #172 from 10up/try/25-modify-parenting
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Introduce feature allowing modifying parent/child relationships.
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@peterwilsoncc
peterwilsoncc authored Jan 22, 2024
2 parents 3430bb1 + 2f857b3 commit 175ea98
Showing 1 changed file with 265 additions and 0 deletions.
265 changes: 265 additions & 0 deletions class-simple-page-ordering.php
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@

use stdClass;
use WP_Error;
use WP_Post;
use WP_REST_Response;
use WP_Query;

Expand Down Expand Up @@ -50,6 +51,180 @@ public static function add_actions() {
add_action( 'wp_ajax_reset_simple_page_ordering', array( __CLASS__, 'ajax_reset_simple_page_ordering' ) );
add_action( 'plugins_loaded', array( __CLASS__, 'load_textdomain' ) );
add_action( 'rest_api_init', array( __CLASS__, 'rest_api_init' ) );

// Custom edit page actions.
add_action( 'post_action_spo-move-under-grandparent', array( __CLASS__, 'handle_move_under_grandparent' ) );
add_action( 'post_action_spo-move-under-sibling', array( __CLASS__, 'handle_move_under_sibling' ) );
}

/**
* Move a post in/up the post parent tree.
*
* This is a custom action on the edit page to modify the post parent
* to be the child it's current grandparent post. If no grandparent
* exists, the post becomes a top level page.
*
* @param int $post_id The post ID.
*/
public static function handle_move_under_grandparent( $post_id ) {
$post = get_post( $post_id );
if ( ! $post ) {
self::redirect_to_referer();
}

check_admin_referer( "simple-page-ordering-nonce-move-{$post->ID}", 'spo_nonce' );

if ( ! current_user_can( 'edit_post', $post->ID ) ) {
wp_die( esc_html__( 'You are not allowed to edit this item.', 'simple-page-ordering' ) );
}

if ( 0 === $post->post_parent ) {
// Top level. Politely continue without doing anything.
self::redirect_to_referer();
}

$ancestors = get_post_ancestors( $post );

// If only one ancestor, set to top level page.
if ( 1 === count( $ancestors ) ) {
$parent_id = 0;
} else {
$parent_id = $ancestors[1];
}

// Update the post.
wp_update_post(
array(
'ID' => $post->ID,
'post_parent' => $parent_id,
)
);

self::redirect_to_referer();
}

/**
* Move a post out/down the post parent tree.
*
* This is a custom action on the edit page to modify the post parent
* to be the child of it's previous sibling post on the current post
* tree.
*
* @param int $post_id The post ID.
*/
public static function handle_move_under_sibling( $post_id ) {
$post = get_post( $post_id );
if ( ! $post ) {
self::redirect_to_referer();
}

check_admin_referer( "simple-page-ordering-nonce-move-{$post->ID}", 'spo_nonce' );

if ( ! current_user_can( 'edit_post', $post->ID ) ) {
wp_die( esc_html__( 'You are not allowed to edit this item.', 'simple-page-ordering' ) );
}

list( 'top_level_pages' => $top_level_pages, 'children_pages' => $children_pages ) = self::get_walked_pages();

// Get the relevant siblings.
if ( 0 === $post->post_parent ) {
$siblings = $top_level_pages;
} else {
$siblings = $children_pages[ $post->post_parent ];
}

// Check if the post being moved is a top level page.
$filtered_siblings = wp_list_filter( $siblings, array( 'ID' => $post->ID ) );
if ( empty( $filtered_siblings ) ) {
// Something went wrong. Do nothing.
self::redirect_to_referer();
}

// Find the previous page in the sibling tree
$key = array_key_first( $filtered_siblings );
if ( 0 === $key ) {
// It's the first page. Do nothing.
self::redirect_to_referer();
}

$previous_page = $siblings[ $key - 1 ];
$previous_page_id = $previous_page->ID;

// Update the post with the previous page as the parent.
wp_update_post(
array(
'ID' => $post->ID,
'post_parent' => $previous_page_id,
)
);

self::redirect_to_referer();
}

/**
* Redirect the user after modifying the post parent.
*/
public static function redirect_to_referer() {
global $post_type;

$send_back = wp_get_referer();
if ( ! $send_back ||
str_contains( $send_back, 'post.php' ) ||
str_contains( $send_back, 'post-new.php' ) ) {
if ( 'attachment' === $post_type ) {
$send_back = admin_url( 'upload.php' );
} else {
$send_back = admin_url( 'edit.php' );
if ( ! empty( $post_type ) ) {
$send_back = add_query_arg( 'post_type', $post_type, $send_back );
}
}
} else {
$send_back = remove_query_arg( array( 'trashed', 'untrashed', 'deleted', 'ids' ), $send_back );
}

wp_safe_redirect( $send_back );
exit;
}

/**
* Walk the pages and return top level and children pages.
*
* @return array {
* @type WP_Post[] $top_level_pages Top level pages.
* @type WP_Post[] $children_pages Children pages.
* }
*/
public static function get_walked_pages() {
global $wpdb;
$pages = get_pages( array( 'sort_column' => 'menu_order title' ) );

$top_level_pages = array();
$children_pages = array();
$bad_parents = array();

foreach ( $pages as $page ) {
// Catch and repair bad pages.
if ( $page->post_parent === $page->ID ) {
$page->post_parent = 0;
$wpdb->update( $wpdb->posts, array( 'post_parent' => 0 ), array( 'ID' => $page->ID ) );
clean_post_cache( $page );
$bad_parents[] = $page->ID;
}

if ( $page->post_parent > 0 ) {
$children_pages[ $page->post_parent ][] = $page;
} else {
$top_level_pages[] = $page;
}
}
// Reprime post cache for bad parents.
_prime_post_caches( $bad_parents, false, false );

return array(
'top_level_pages' => $top_level_pages,
'children_pages' => $children_pages,
);
}

/**
Expand Down Expand Up @@ -109,6 +284,7 @@ public static function load_edit_screen() {
add_action( 'pre_get_posts', array( __CLASS__, 'filter_query' ) );
add_action( 'wp', array( __CLASS__, 'wp' ) );
add_action( 'admin_head', array( __CLASS__, 'admin_head' ) );
add_action( 'page_row_actions', array( __CLASS__, 'page_row_actions' ), 10, 2 );
}

/**
Expand Down Expand Up @@ -199,6 +375,95 @@ public static function admin_head() {
);
}

/**
* Modify the row actions for hierarchical post types.
*
* This adds the actions to change the parent/child relationships.
*
* @param array $actions An array of row action links.
* @param WP_Post $post The post object.
*/
public static function page_row_actions( $actions, $post ) {
$post = get_post( $post );
if ( ! $post ) {
return $actions;
}

if ( ! current_user_can( 'edit_post', $post->ID ) ) {
return $actions;
}

list( 'top_level_pages' => $top_level_pages, 'children_pages' => $children_pages ) = self::get_walked_pages();

$edit_link = get_edit_post_link( $post->ID, 'raw' );
$move_under_grandparent_link = add_query_arg(
array(
'action' => 'spo-move-under-grandparent',
'spo_nonce' => wp_create_nonce( "simple-page-ordering-nonce-move-{$post->ID}" ),
'post_type' => $post->post_type,
),
$edit_link
);
$move_under_sibling_link = add_query_arg(
array(
'action' => 'spo-move-under-sibling',
'spo_nonce' => wp_create_nonce( "simple-page-ordering-nonce-move-{$post->ID}" ),
'post_type' => $post->post_type,
),
$edit_link
);

$parent_id = $post->post_parent;
if ( $parent_id ) {
$actions['spo-move-under-grandparent'] = sprintf(
'<a href="%s">%s</a>',
esc_url( $move_under_grandparent_link ),
sprintf(
/* translators: %s: parent page/post title */
__( 'Move out from under %s' ),
get_the_title( $parent_id )
)
);
}

// Get the relevant siblings.
if ( 0 === $post->post_parent ) {
$siblings = $top_level_pages;
} else {
$siblings = $children_pages[ $post->post_parent ];
}

// Assume no sibling.
$sibling = 0;
// Check if the post being moved is a top level page.
$filtered_siblings = wp_list_filter( $siblings, array( 'ID' => $post->ID ) );
if ( ! empty( $filtered_siblings ) ) {
// Find the previous page in the sibling tree
$key = array_key_first( $filtered_siblings );
if ( 0 === $key ) {
// It's the first page, can't do anything.
$sibling = 0;
} else {
$previous_page = $siblings[ $key - 1 ];
$sibling = $previous_page->ID;
}
}

if ( $sibling ) {
$actions['spo-move-under-sibling'] = sprintf(
'<a href="%s">%s</a>',
esc_url( $move_under_sibling_link ),
sprintf(
/* translators: %s: sibling page/post title */
__( 'Move under %s' ),
get_the_title( $sibling )
)
);
}

return $actions;
}

/**
* Page ordering ajax callback
*
Expand Down

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