<?php
/**
* Server-side rendering of the `core/calendar` block.
*
* @package WordPress
*/
/**
* Renders the `core/calendar` block on server.
*
* @param array $attributes The block attributes.
*
* @return string Returns the block content.
*/
function render_block_core_calendar( $attributes ) {
global $monthnum, $year;
// Calendar shouldn't be rendered
// when there are no published posts on the site.
if ( ! block_core_calendar_has_published_posts() ) {
if ( is_user_logged_in() ) {
return '<div>' . __( 'The calendar block is hidden because there are no published posts.' ) . '</div>';
}
return '';
}
$previous_monthnum = $monthnum;
$previous_year = $year;
if ( isset( $attributes['month'] ) && isset( $attributes['year'] ) ) {
$permalink_structure = get_option( 'permalink_structure' );
if (
strpos( $permalink_structure, '%monthnum%' ) !== false &&
strpos( $permalink_structure, '%year%' ) !== false
) {
// phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
$monthnum = $attributes['month'];
// phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
$year = $attributes['year'];
}
}
$wrapper_attributes = get_block_wrapper_attributes();
$output = sprintf(
'<div %1$s>%2$s</div>',
$wrapper_attributes,
get_calendar( true, false )
);
// phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
$monthnum = $previous_monthnum;
// phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
$year = $previous_year;
return $output;
}
/**
* Registers the `core/calendar` block on server.
*/
function register_block_core_calendar() {
register_block_type_from_metadata(
__DIR__ . '/calendar',
array(
'render_callback' => 'render_block_core_calendar',
)
);
}
add_action( 'init', 'register_block_core_calendar' );
/**
* Returns whether or not there are any published posts.
*
* Used to hide the calendar block when there are no published posts.
* This compensates for a known Core bug: https://core.trac.wordpress.org/ticket/12016
*
* @return bool Has any published posts or not.
*/
function block_core_calendar_has_published_posts() {
// Multisite already has an option that stores the count of the published posts.
// Let's use that for multisites.
if ( is_multisite() ) {
return 0 < (int) get_option( 'post_count' );
}
// On single sites we try our own cached option first.
$has_published_posts = get_option( 'wp_calendar_block_has_published_posts', null );
if ( null !== $has_published_posts ) {
return (bool) $has_published_posts;
}
// No cache hit, let's update the cache and return the cached value.
return block_core_calendar_update_has_published_posts();
}
/**
* Queries the database for any published post and saves
* a flag whether any published post exists or not.
*
* @return bool Has any published posts or not.
*/
function block_core_calendar_update_has_published_posts() {
global $wpdb;
$has_published_posts = (bool) $wpdb->get_var( "SELECT 1 as test FROM {$wpdb->posts} WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1" );
update_option( 'wp_calendar_block_has_published_posts', $has_published_posts );
return $has_published_posts;
}
// We only want to register these functions and actions when
// we are on single sites. On multi sites we use `post_count` option.
if ( ! is_multisite() ) {
/**
* Handler for updating the has published posts flag when a post is deleted.
*
* @param int $post_id Deleted post ID.
*/
function block_core_calendar_update_has_published_post_on_delete( $post_id ) {
$post = get_post( $post_id );
if ( ! $post || 'publish' !== $post->post_status || 'post' !== $post->post_type ) {
return;
}
block_core_calendar_update_has_published_posts();
}
/**
* Handler for updating the has published posts flag when a post status changes.
*
* @param string $new_status The status the post is changing to.
* @param string $old_status The status the post is changing from.
* @param WP_Post $post Post object.
*/
function block_core_calendar_update_has_published_post_on_transition_post_status( $new_status, $old_status, $post ) {
if ( $new_status === $old_status ) {
return;
}
if ( 'post' !== get_post_type( $post ) ) {
return;
}
if ( 'publish' !== $new_status && 'publish' !== $old_status ) {
return;
}
block_core_calendar_update_has_published_posts();
}
add_action( 'delete_post', 'block_core_calendar_update_has_published_post_on_delete' );
add_action( 'transition_post_status', 'block_core_calendar_update_has_published_post_on_transition_post_status', 10, 3 );
}