<?php

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/**

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* Common theme functions

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*

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* @package WordPress

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* @subpackage Twenty_Nineteen

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* @since Twenty Nineteen 1.5

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*/

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/**

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* Determines if post thumbnail can be displayed.

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*/

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function twentynineteen_can_show_post_thumbnail() {

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return apply_filters( 'twentynineteen_can_show_post_thumbnail', ! post_password_required() && ! is_attachment() && has_post_thumbnail() );

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}

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/**

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* Returns true if image filters are enabled on the theme options.

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*/

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function twentynineteen_image_filters_enabled() {

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return 0 !== get_theme_mod( 'image_filter', 1 );

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}

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/**

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* Returns the size for avatars used in the theme.

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*/

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function twentynineteen_get_avatar_size() {

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return 60;

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}

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/**

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* Returns true if comment is by author of the post.

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*

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* @see get_comment_class()

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*/

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function twentynineteen_is_comment_by_post_author( $comment = null ) {

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if ( is_object( $comment ) && $comment->user_id > 0 ) {

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$user = get_userdata( $comment->user_id );

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$post = get_post( $comment->comment_post_ID );

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if ( ! empty( $user ) && ! empty( $post ) ) {

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return $comment->user_id === $post->post_author;

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}

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}

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return false;

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}

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/**

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* Returns information about the current post's discussion, with cache support.

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*/

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function twentynineteen_get_discussion_data() {

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static $discussion, $post_id;

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$current_post_id = get_the_ID();

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if ( $current_post_id === $post_id ) {

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return $discussion; /* If we have discussion information for post ID, return cached object */

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} else {

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$post_id = $current_post_id;

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}

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$comments = get_comments(

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array(

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'post_id' => $current_post_id,

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'orderby' => 'comment_date_gmt',

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'order' => get_option( 'comment_order', 'asc' ), /* Respect comment order from Settings » Discussion. */

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'status' => 'approve',

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'number' => 20, /* Only retrieve the last 20 comments, as the end goal is just 6 unique authors */

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)

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);

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$authors = array();

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foreach ( $comments as $comment ) {

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$authors[] = ( (int) $comment->user_id > 0 ) ? (int) $comment->user_id : $comment->comment_author_email;

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}

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$authors = array_unique( $authors );

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$discussion = (object) array(

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'authors' => array_slice( $authors, 0, 6 ), /* Six unique authors commenting on the post. */

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'responses' => get_comments_number( $current_post_id ), /* Number of responses. */

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);

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return $discussion;

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}

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/**

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* Converts HSL to HEX colors.

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*/

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function twentynineteen_hsl_hex( $h, $s, $l, $to_hex = true ) {

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$h /= 360;

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$s /= 100;

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$l /= 100;

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$r = $l;

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$g = $l;

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$b = $l;

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$v = ( $l <= 0.5 ) ? ( $l * ( 1.0 + $s ) ) : ( $l + $s - $l * $s );

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if ( $v > 0 ) {

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$m = $l + $l - $v;

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$sv = ( $v - $m ) / $v;

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$h *= 6.0;

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$sextant = floor( $h );

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$fract = $h - $sextant;

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$vsf = $v * $sv * $fract;

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$mid1 = $m + $vsf;

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$mid2 = $v - $vsf;

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switch ( $sextant ) {

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case 0:

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$r = $v;

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$g = $mid1;

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$b = $m;

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break;

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case 1:

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$r = $mid2;

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$g = $v;

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$b = $m;

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break;

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case 2:

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$r = $m;

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$g = $v;

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$b = $mid1;

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break;

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case 3:

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$r = $m;

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$g = $mid2;

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$b = $v;

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break;

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case 4:

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$r = $mid1;

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$g = $m;

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$b = $v;

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break;

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case 5:

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$r = $v;

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$g = $m;

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$b = $mid2;

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break;

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}

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}

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$r = round( $r * 255, 0 );

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$g = round( $g * 255, 0 );

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$b = round( $b * 255, 0 );

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if ( $to_hex ) {

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$r = ( $r < 15 ) ? '0' . dechex( $r ) : dechex( $r );

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$g = ( $g < 15 ) ? '0' . dechex( $g ) : dechex( $g );

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$b = ( $b < 15 ) ? '0' . dechex( $b ) : dechex( $b );

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return "#$r$g$b";

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}

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return "rgb($r, $g, $b)";

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}

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