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   1  <?php
   2  /**
   3   * Common theme functions
   4   *
   5   * @package WordPress
   6   * @subpackage Twenty_Nineteen
   7   * @since Twenty Nineteen 1.5
   8   */
   9  
  10  /**
  11   * Determines if post thumbnail can be displayed.
  12   */
  13  function twentynineteen_can_show_post_thumbnail() {
  14      return apply_filters( 'twentynineteen_can_show_post_thumbnail', ! post_password_required() && ! is_attachment() && has_post_thumbnail() );
  15  }
  16  
  17  /**
  18   * Returns true if image filters are enabled on the theme options.
  19   */
  20  function twentynineteen_image_filters_enabled() {
  21      return 0 !== get_theme_mod( 'image_filter', 1 );
  22  }
  23  
  24  /**
  25   * Returns the size for avatars used in the theme.
  26   */
  27  function twentynineteen_get_avatar_size() {
  28      return 60;
  29  }
  30  
  31  /**
  32   * Returns true if comment is by author of the post.
  33   *
  34   * @see get_comment_class()
  35   */
  36  function twentynineteen_is_comment_by_post_author( $comment = null ) {
  37      if ( is_object( $comment ) && $comment->user_id > 0 ) {
  38          $user = get_userdata( $comment->user_id );
  39          $post = get_post( $comment->comment_post_ID );
  40          if ( ! empty( $user ) && ! empty( $post ) ) {
  41              return $comment->user_id === $post->post_author;
  42          }
  43      }
  44      return false;
  45  }
  46  
  47  /**
  48   * Returns information about the current post's discussion, with cache support.
  49   */
  50  function twentynineteen_get_discussion_data() {
  51      static $discussion, $post_id;
  52  
  53      $current_post_id = get_the_ID();
  54      if ( $current_post_id === $post_id ) {
  55          return $discussion; /* If we have discussion information for post ID, return cached object */
  56      } else {
  57          $post_id = $current_post_id;
  58      }
  59  
  60      $comments = get_comments(
  61          array(
  62              'post_id' => $current_post_id,
  63              'orderby' => 'comment_date_gmt',
  64              'order'   => get_option( 'comment_order', 'asc' ), /* Respect comment order from Settings » Discussion. */
  65              'status'  => 'approve',
  66              'number'  => 20, /* Only retrieve the last 20 comments, as the end goal is just 6 unique authors */
  67          )
  68      );
  69  
  70      $authors = array();
  71      foreach ( $comments as $comment ) {
  72          $authors[] = ( (int) $comment->user_id > 0 ) ? (int) $comment->user_id : $comment->comment_author_email;
  73      }
  74  
  75      $authors    = array_unique( $authors );
  76      $discussion = (object) array(
  77          'authors'   => array_slice( $authors, 0, 6 ),           /* Six unique authors commenting on the post. */
  78          'responses' => get_comments_number( $current_post_id ), /* Number of responses. */
  79      );
  80  
  81      return $discussion;
  82  }
  83  
  84  /**
  85   * Converts HSL to HEX colors.
  86   */
  87  function twentynineteen_hsl_hex( $h, $s, $l, $to_hex = true ) {
  88  
  89      $h /= 360;
  90      $s /= 100;
  91      $l /= 100;
  92  
  93      $r = $l;
  94      $g = $l;
  95      $b = $l;
  96      $v = ( $l <= 0.5 ) ? ( $l * ( 1.0 + $s ) ) : ( $l + $s - $l * $s );
  97  
  98      if ( $v > 0 ) {
  99          $m       = $l + $l - $v;
 100          $sv      = ( $v - $m ) / $v;
 101          $h      *= 6.0;
 102          $sextant = floor( $h );
 103          $fract   = $h - $sextant;
 104          $vsf     = $v * $sv * $fract;
 105          $mid1    = $m + $vsf;
 106          $mid2    = $v - $vsf;
 107  
 108          switch ( $sextant ) {
 109              case 0:
 110                  $r = $v;
 111                  $g = $mid1;
 112                  $b = $m;
 113                  break;
 114              case 1:
 115                  $r = $mid2;
 116                  $g = $v;
 117                  $b = $m;
 118                  break;
 119              case 2:
 120                  $r = $m;
 121                  $g = $v;
 122                  $b = $mid1;
 123                  break;
 124              case 3:
 125                  $r = $m;
 126                  $g = $mid2;
 127                  $b = $v;
 128                  break;
 129              case 4:
 130                  $r = $mid1;
 131                  $g = $m;
 132                  $b = $v;
 133                  break;
 134              case 5:
 135                  $r = $v;
 136                  $g = $m;
 137                  $b = $mid2;
 138                  break;
 139          }
 140      }
 141  
 142      $r = round( $r * 255, 0 );
 143      $g = round( $g * 255, 0 );
 144      $b = round( $b * 255, 0 );
 145  
 146      if ( $to_hex ) {
 147  
 148          $r = ( $r < 15 ) ? '0' . dechex( $r ) : dechex( $r );
 149          $g = ( $g < 15 ) ? '0' . dechex( $g ) : dechex( $g );
 150          $b = ( $b < 15 ) ? '0' . dechex( $b ) : dechex( $b );
 151  
 152          return "#$r$g$b";
 153  
 154      }
 155  
 156      return "rgb($r, $g, $b)";
 157  }