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   1  <?php
   2  /**
   3   * Server-side rendering of the `core/calendar` block.
   4   *
   5   * @package WordPress
   6   */
   7  
   8  /**
   9   * Renders the `core/calendar` block on server.
  10   *
  11   * @param array $attributes The block attributes.
  12   *
  13   * @return string Returns the block content.
  14   */
  15  function render_block_core_calendar( $attributes ) {
  16      global $monthnum, $year;
  17  
  18      // Calendar shouldn't be rendered
  19      // when there are no published posts on the site.
  20      if ( ! block_core_calendar_has_published_posts() ) {
  21          if ( is_user_logged_in() ) {
  22              return '<div>' . __( 'The calendar block is hidden because there are no published posts.' ) . '</div>';
  23          }
  24          return '';
  25      }
  26  
  27      $previous_monthnum = $monthnum;
  28      $previous_year     = $year;
  29  
  30      if ( isset( $attributes['month'] ) && isset( $attributes['year'] ) ) {
  31          $permalink_structure = get_option( 'permalink_structure' );
  32          if (
  33              str_contains( $permalink_structure, '%monthnum%' ) &&
  34              str_contains( $permalink_structure, '%year%' )
  35          ) {
  36              $monthnum = $attributes['month'];
  37              $year     = $attributes['year'];
  38          }
  39      }
  40  
  41      $color_block_styles = array();
  42  
  43      // Text color.
  44      $preset_text_color          = array_key_exists( 'textColor', $attributes ) ? "var:preset|color|{$attributes['textColor']}" : null;
  45      $custom_text_color          = $attributes['style']['color']['text'] ?? null;
  46      $color_block_styles['text'] = $preset_text_color ? $preset_text_color : $custom_text_color;
  47  
  48      // Background Color.
  49      $preset_background_color          = array_key_exists( 'backgroundColor', $attributes ) ? "var:preset|color|{$attributes['backgroundColor']}" : null;
  50      $custom_background_color          = $attributes['style']['color']['background'] ?? null;
  51      $color_block_styles['background'] = $preset_background_color ? $preset_background_color : $custom_background_color;
  52  
  53      // Generate color styles and classes.
  54      $styles        = wp_style_engine_get_styles( array( 'color' => $color_block_styles ), array( 'convert_vars_to_classnames' => true ) );
  55      $inline_styles = empty( $styles['css'] ) ? '' : sprintf( ' style="%s"', esc_attr( $styles['css'] ) );
  56      $classnames    = empty( $styles['classnames'] ) ? '' : ' ' . esc_attr( $styles['classnames'] );
  57      if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
  58          $classnames .= ' has-link-color';
  59      }
  60      // Apply color classes and styles to the calendar.
  61      $calendar = str_replace( '<table', '<table' . $inline_styles, get_calendar( true, false ) );
  62      $calendar = str_replace( 'class="wp-calendar-table', 'class="wp-calendar-table' . $classnames, $calendar );
  63  
  64      $wrapper_attributes = get_block_wrapper_attributes();
  65      $output             = sprintf(
  66          '<div %1$s>%2$s</div>',
  67          $wrapper_attributes,
  68          $calendar
  69      );
  70  
  71      $monthnum = $previous_monthnum;
  72      $year     = $previous_year;
  73  
  74      return $output;
  75  }
  76  
  77  /**
  78   * Registers the `core/calendar` block on server.
  79   */
  80  function register_block_core_calendar() {
  81      register_block_type_from_metadata(
  82          __DIR__ . '/calendar',
  83          array(
  84              'render_callback' => 'render_block_core_calendar',
  85          )
  86      );
  87  }
  88  
  89  add_action( 'init', 'register_block_core_calendar' );
  90  
  91  /**
  92   * Returns whether or not there are any published posts.
  93   *
  94   * Used to hide the calendar block when there are no published posts.
  95   * This compensates for a known Core bug: https://core.trac.wordpress.org/ticket/12016
  96   *
  97   * @return bool Has any published posts or not.
  98   */
  99  function block_core_calendar_has_published_posts() {
 100      // Multisite already has an option that stores the count of the published posts.
 101      // Let's use that for multisites.
 102      if ( is_multisite() ) {
 103          return 0 < (int) get_option( 'post_count' );
 104      }
 105  
 106      // On single sites we try our own cached option first.
 107      $has_published_posts = get_option( 'wp_calendar_block_has_published_posts', null );
 108      if ( null !== $has_published_posts ) {
 109          return (bool) $has_published_posts;
 110      }
 111  
 112      // No cache hit, let's update the cache and return the cached value.
 113      return block_core_calendar_update_has_published_posts();
 114  }
 115  
 116  /**
 117   * Queries the database for any published post and saves
 118   * a flag whether any published post exists or not.
 119   *
 120   * @return bool Has any published posts or not.
 121   */
 122  function block_core_calendar_update_has_published_posts() {
 123      global $wpdb;
 124      $has_published_posts = (bool) $wpdb->get_var( "SELECT 1 as test FROM {$wpdb->posts} WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1" );
 125      update_option( 'wp_calendar_block_has_published_posts', $has_published_posts );
 126      return $has_published_posts;
 127  }
 128  
 129  // We only want to register these functions and actions when
 130  // we are on single sites. On multi sites we use `post_count` option.
 131  if ( ! is_multisite() ) {
 132      /**
 133       * Handler for updating the has published posts flag when a post is deleted.
 134       *
 135       * @param int $post_id Deleted post ID.
 136       */
 137      function block_core_calendar_update_has_published_post_on_delete( $post_id ) {
 138          $post = get_post( $post_id );
 139  
 140          if ( ! $post || 'publish' !== $post->post_status || 'post' !== $post->post_type ) {
 141              return;
 142          }
 143  
 144          block_core_calendar_update_has_published_posts();
 145      }
 146  
 147      /**
 148       * Handler for updating the has published posts flag when a post status changes.
 149       *
 150       * @param string  $new_status The status the post is changing to.
 151       * @param string  $old_status The status the post is changing from.
 152       * @param WP_Post $post       Post object.
 153       */
 154      function block_core_calendar_update_has_published_post_on_transition_post_status( $new_status, $old_status, $post ) {
 155          if ( $new_status === $old_status ) {
 156              return;
 157          }
 158  
 159          if ( 'post' !== get_post_type( $post ) ) {
 160              return;
 161          }
 162  
 163          if ( 'publish' !== $new_status && 'publish' !== $old_status ) {
 164              return;
 165          }
 166  
 167          block_core_calendar_update_has_published_posts();
 168      }
 169  
 170      add_action( 'delete_post', 'block_core_calendar_update_has_published_post_on_delete' );
 171      add_action( 'transition_post_status', 'block_core_calendar_update_has_published_post_on_transition_post_status', 10, 3 );
 172  }