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<?php
/**
* Functions which enhance the theme by hooking into WordPress
*
* @package WordPress
* @subpackage Twenty_Nineteen
* @since 1.0.0
*/
/**
* Adds custom classes to the array of body classes.
*
* @param array $classes Classes for the body element.
* @return array
*/
function twentynineteen_body_classes( $classes ) {
if ( is_singular() ) {
// Adds `singular` to singular pages.
$classes[] = 'singular';
} else {
// Adds `hfeed` to non singular pages.
$classes[] = 'hfeed';
}
// Adds a class if image filters are enabled.
if ( twentynineteen_image_filters_enabled() ) {
$classes[] = 'image-filters-enabled';
}
return $classes;
}
add_filter( 'body_class', 'twentynineteen_body_classes' );
/**
* Adds custom class to the array of posts classes.
*/
function twentynineteen_post_classes( $classes, $class, $post_id ) {
$classes[] = 'entry';
return $classes;
}
add_filter( 'post_class', 'twentynineteen_post_classes', 10, 3 );
/**
* Add a pingback url auto-discovery header for single posts, pages, or attachments.
*/
function twentynineteen_pingback_header() {
if ( is_singular() && pings_open() ) {
echo '<link rel="pingback" href="', esc_url( get_bloginfo( 'pingback_url' ) ), '">';
}
}
add_action( 'wp_head', 'twentynineteen_pingback_header' );
/**
* Changes comment form default fields.
*/
function twentynineteen_comment_form_defaults( $defaults ) {
$comment_field = $defaults['comment_field'];
// Adjust height of comment form.
$defaults['comment_field'] = preg_replace( '/rows="\d+"/', 'rows="5"', $comment_field );
return $defaults;
}
add_filter( 'comment_form_defaults', 'twentynineteen_comment_form_defaults' );
/**
* Filters the default archive titles.
*/
function twentynineteen_get_the_archive_title() {
if ( is_category() ) {
$title = __( 'Category Archives: ', 'twentynineteen' ) . '<span class="page-description">' . single_term_title( '', false ) . '</span>';
} elseif ( is_tag() ) {
$title = __( 'Tag Archives: ', 'twentynineteen' ) . '<span class="page-description">' . single_term_title( '', false ) . '</span>';
} elseif ( is_author() ) {
$title = __( 'Author Archives: ', 'twentynineteen' ) . '<span class="page-description">' . get_the_author_meta( 'display_name' ) . '</span>';
} elseif ( is_year() ) {
$title = __( 'Yearly Archives: ', 'twentynineteen' ) . '<span class="page-description">' . get_the_date( _x( 'Y', 'yearly archives date format', 'twentynineteen' ) ) . '</span>';
} elseif ( is_month() ) {
$title = __( 'Monthly Archives: ', 'twentynineteen' ) . '<span class="page-description">' . get_the_date( _x( 'F Y', 'monthly archives date format', 'twentynineteen' ) ) . '</span>';
} elseif ( is_day() ) {
$title = __( 'Daily Archives: ', 'twentynineteen' ) . '<span class="page-description">' . get_the_date() . '</span>';
} elseif ( is_post_type_archive() ) {
$title = __( 'Post Type Archives: ', 'twentynineteen' ) . '<span class="page-description">' . post_type_archive_title( '', false ) . '</span>';
} elseif ( is_tax() ) {
$tax = get_taxonomy( get_queried_object()->taxonomy );
/* translators: %s: Taxonomy singular name. */
$title = sprintf( esc_html__( '%s Archives:', 'twentynineteen' ), $tax->labels->singular_name );
} else {
$title = __( 'Archives:', 'twentynineteen' );
}
return $title;
}
add_filter( 'get_the_archive_title', 'twentynineteen_get_the_archive_title' );
/**
* Determines if post thumbnail can be displayed.
*/
function twentynineteen_can_show_post_thumbnail() {
return apply_filters( 'twentynineteen_can_show_post_thumbnail', ! post_password_required() && ! is_attachment() && has_post_thumbnail() );
}
/**
* Returns true if image filters are enabled on the theme options.
*/
function twentynineteen_image_filters_enabled() {
return 0 !== get_theme_mod( 'image_filter', 1 );
}
/**
* Add custom sizes attribute to responsive image functionality for post thumbnails.
*
* @origin Twenty Nineteen 1.0
*
* @param array $attr Attributes for the image markup.
* @return string Value for use in post thumbnail 'sizes' attribute.
*/
function twentynineteen_post_thumbnail_sizes_attr( $attr ) {
if ( is_admin() ) {
return $attr;
}
if ( ! is_singular() ) {
$attr['sizes'] = '(max-width: 34.9rem) calc(100vw - 2rem), (max-width: 53rem) calc(8 * (100vw / 12)), (min-width: 53rem) calc(6 * (100vw / 12)), 100vw';
}
return $attr;
}
add_filter( 'wp_get_attachment_image_attributes', 'twentynineteen_post_thumbnail_sizes_attr', 10, 1 );
/**
* Returns the size for avatars used in the theme.
*/
function twentynineteen_get_avatar_size() {
return 60;
}
/**
* Returns true if comment is by author of the post.
*
* @see get_comment_class()
*/
function twentynineteen_is_comment_by_post_author( $comment = null ) {
if ( is_object( $comment ) && $comment->user_id > 0 ) {
$user = get_userdata( $comment->user_id );
$post = get_post( $comment->comment_post_ID );
if ( ! empty( $user ) && ! empty( $post ) ) {
return $comment->user_id === $post->post_author;
}
}
return false;
}
/**
* Returns information about the current post's discussion, with cache support.
*/
function twentynineteen_get_discussion_data() {
static $discussion, $post_id;
$current_post_id = get_the_ID();
if ( $current_post_id === $post_id ) {
return $discussion; /* If we have discussion information for post ID, return cached object */
} else {
$post_id = $current_post_id;
}
$comments = get_comments(
array(
'post_id' => $current_post_id,
'orderby' => 'comment_date_gmt',
'order' => get_option( 'comment_order', 'asc' ), /* Respect comment order from Settings » Discussion. */
'status' => 'approve',
'number' => 20, /* Only retrieve the last 20 comments, as the end goal is just 6 unique authors */
)
);
$authors = array();
foreach ( $comments as $comment ) {
$authors[] = ( (int) $comment->user_id > 0 ) ? (int) $comment->user_id : $comment->comment_author_email;
}
$authors = array_unique( $authors );
$discussion = (object) array(
'authors' => array_slice( $authors, 0, 6 ), /* Six unique authors commenting on the post. */
'responses' => get_comments_number( $current_post_id ), /* Number of responses. */
);
return $discussion;
}
/**
* Add an extra menu to our nav for our priority+ navigation to use
*
* @param object $nav_menu Nav menu.
* @param object $args Nav menu args.
* @return string More link for hidden menu items.
*/
function twentynineteen_add_ellipses_to_nav( $nav_menu, $args ) {
if ( 'menu-1' === $args->theme_location ) :
$nav_menu .= '
<div class="main-menu-more">
<ul class="main-menu">
<li class="menu-item menu-item-has-children">
<button class="submenu-expand main-menu-more-toggle is-empty" tabindex="-1"
aria-label="' . esc_attr__( 'More', 'twentynineteen' ) . '" aria-haspopup="true" aria-expanded="false">' .
twentynineteen_get_icon_svg( 'arrow_drop_down_ellipsis' ) . '
</button>
<ul class="sub-menu hidden-links">
<li class="mobile-parent-nav-menu-item">
<button class="menu-item-link-return">' .
twentynineteen_get_icon_svg( 'chevron_left' ) .
esc_html__( 'Back', 'twentynineteen' ) . '
</button>
</li>
</ul>
</li>
</ul>
</div>';
endif;
return $nav_menu;
}
add_filter( 'wp_nav_menu', 'twentynineteen_add_ellipses_to_nav', 10, 2 );
/**
* WCAG 2.0 Attributes for Dropdown Menus
*
* Adjustments to menu attributes tot support WCAG 2.0 recommendations
* for flyout and dropdown menus.
*
* @ref https://www.w3.org/WAI/tutorials/menus/flyout/
*/
function twentynineteen_nav_menu_link_attributes( $atts, $item, $args, $depth ) {
// Add [aria-haspopup] and [aria-expanded] to menu items that have children
$item_has_children = in_array( 'menu-item-has-children', $item->classes );
if ( $item_has_children ) {
$atts['aria-haspopup'] = 'true';
$atts['aria-expanded'] = 'false';
}
return $atts;
}
add_filter( 'nav_menu_link_attributes', 'twentynineteen_nav_menu_link_attributes', 10, 4 );
/**
* Add a dropdown icon to top-level menu items.
*
* @param string $output Nav menu item start element.
* @param object $item Nav menu item.
* @param int $depth Depth.
* @param object $args Nav menu args.
* @return string Nav menu item start element.
* Add a dropdown icon to top-level menu items
*/
function twentynineteen_add_dropdown_icons( $output, $item, $depth, $args ) {
// Only add class to 'top level' items on the 'primary' menu.
if ( ! isset( $args->theme_location ) || 'menu-1' !== $args->theme_location ) {
return $output;
}
if ( in_array( 'mobile-parent-nav-menu-item', $item->classes, true ) && isset( $item->original_id ) ) {
// Inject the keyboard_arrow_left SVG inside the parent nav menu item, and let the item link to the parent item.
// @todo Only do this for nested submenus? If on a first-level submenu, then really the link could be "#" since the desire is to remove the target entirely.
$link = sprintf(
'<button class="menu-item-link-return" tabindex="-1">%s',
twentynineteen_get_icon_svg( 'chevron_left', 24 )
);
// replace opening <a> with <button>
$output = preg_replace(
'/<a\s.*?>/',
$link,
$output,
1 // Limit.
);
// replace closing </a> with </button>
$output = preg_replace(
'#</a>#i',
'</button>',
$output,
1 // Limit.
);
} elseif ( in_array( 'menu-item-has-children', $item->classes, true ) ) {
// Add SVG icon to parent items.
$icon = twentynineteen_get_icon_svg( 'keyboard_arrow_down', 24 );
$output .= sprintf(
'<button class="submenu-expand" tabindex="-1">%s</button>',
$icon
);
}
return $output;
}
add_filter( 'walker_nav_menu_start_el', 'twentynineteen_add_dropdown_icons', 10, 4 );
/**
* Create a nav menu item to be displayed on mobile to navigate from submenu back to the parent.
*
* This duplicates each parent nav menu item and makes it the first child of itself.
*
* @param array $sorted_menu_items Sorted nav menu items.
* @param object $args Nav menu args.
* @return array Amended nav menu items.
*/
function twentynineteen_add_mobile_parent_nav_menu_items( $sorted_menu_items, $args ) {
static $pseudo_id = 0;
if ( ! isset( $args->theme_location ) || 'menu-1' !== $args->theme_location ) {
return $sorted_menu_items;
}
$amended_menu_items = array();
foreach ( $sorted_menu_items as $nav_menu_item ) {
$amended_menu_items[] = $nav_menu_item;
if ( in_array( 'menu-item-has-children', $nav_menu_item->classes, true ) ) {
$parent_menu_item = clone $nav_menu_item;
$parent_menu_item->original_id = $nav_menu_item->ID;
$parent_menu_item->ID = --$pseudo_id;
$parent_menu_item->db_id = $parent_menu_item->ID;
$parent_menu_item->object_id = $parent_menu_item->ID;
$parent_menu_item->classes = array( 'mobile-parent-nav-menu-item' );
$parent_menu_item->menu_item_parent = $nav_menu_item->ID;
$amended_menu_items[] = $parent_menu_item;
}
}
return $amended_menu_items;
}
add_filter( 'wp_nav_menu_objects', 'twentynineteen_add_mobile_parent_nav_menu_items', 10, 2 );
/**
* Convert HSL to HEX colors
*/
function twentynineteen_hsl_hex( $h, $s, $l, $to_hex = true ) {
$h /= 360;
$s /= 100;
$l /= 100;
$r = $l;
$g = $l;
$b = $l;
$v = ( $l <= 0.5 ) ? ( $l * ( 1.0 + $s ) ) : ( $l + $s - $l * $s );
if ( $v > 0 ) {
$m;
$sv;
$sextant;
$fract;
$vsf;
$mid1;
$mid2;
$m = $l + $l - $v;
$sv = ( $v - $m ) / $v;
$h *= 6.0;
$sextant = floor( $h );
$fract = $h - $sextant;
$vsf = $v * $sv * $fract;
$mid1 = $m + $vsf;
$mid2 = $v - $vsf;
switch ( $sextant ) {
case 0:
$r = $v;
$g = $mid1;
$b = $m;
break;
case 1:
$r = $mid2;
$g = $v;
$b = $m;
break;
case 2:
$r = $m;
$g = $v;
$b = $mid1;
break;
case 3:
$r = $m;
$g = $mid2;
$b = $v;
break;
case 4:
$r = $mid1;
$g = $m;
$b = $v;
break;
case 5:
$r = $v;
$g = $m;
$b = $mid2;
break;
}
}
$r = round( $r * 255, 0 );
$g = round( $g * 255, 0 );
$b = round( $b * 255, 0 );
if ( $to_hex ) {
$r = ( $r < 15 ) ? '0' . dechex( $r ) : dechex( $r );
$g = ( $g < 15 ) ? '0' . dechex( $g ) : dechex( $g );
$b = ( $b < 15 ) ? '0' . dechex( $b ) : dechex( $b );
return "#$r$g$b";
}
return "rgb($r, $g, $b)";
}
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