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File name : post-details.php
Content :
<?php
/**
 * Theme Tools: functions for Post Details.
 *
 * @package automattic/jetpack-classic-theme-helper
 */

if ( ! function_exists( 'jetpack_post_details_enqueue_scripts' ) ) {

	/**
	 * The function to include Post Details in a theme's stylesheet.
	 */
	function jetpack_post_details_enqueue_scripts() {
		// Make sure we can proceed.
		list( $should_run, $options, $definied, $post_details ) = jetpack_post_details_should_run();

		if ( ! $should_run ) {
			return;
		}

		list( $date_option, $categories_option, $tags_option, $author_option, $comment_option ) = $options;
		list( $date, $categories, $tags, $author, $comment )                                    = $definied;

		$elements = array();

		// If date option is unticked, add it to the list of classes.
		if ( 1 !== (int) $date_option && ! empty( $date ) ) {
			$elements[] = $date;
		}

		// If categories option is unticked, add it to the list of classes.
		if ( 1 !== (int) $categories_option && ! empty( $categories ) ) {
			$elements[] = $categories;
		}

		// If tags option is unticked, add it to the list of classes.
		if ( 1 !== (int) $tags_option && ! empty( $tags ) ) {
			$elements[] = $tags;
		}

		// If author option is unticked, add it to the list of classes.
		if ( 1 !== (int) $author_option && ! empty( $author ) ) {
			$elements[] = $author;
		}

		// If comment option is unticked, add it to the list of classes.
		if ( 1 !== (int) $comment_option && ! empty( $comment ) ) {
			$elements[] = $comment;
		}

		// If the Elements array is empty, return without setting custom CSS.
		if ( empty( $elements ) ) {
			return;
		}

		// Get the list of classes.
		$elements = implode( ', ', $elements );

		// Hide the classes with CSS.
		$css = $elements . ' { clip: rect(1px, 1px, 1px, 1px); height: 1px; position: absolute; overflow: hidden; width: 1px; }';

		// Add the CSS to the stylesheet.

		if ( is_array( $post_details ) && isset( $post_details['stylesheet'] ) ) {
			wp_add_inline_style( $post_details['stylesheet'], $css );
		}
	}
	add_action( 'wp_enqueue_scripts', 'jetpack_post_details_enqueue_scripts' );

}

if ( ! function_exists( 'jetpack_post_details_body_classes' ) ) {

	/**
	 * Adds custom classes to the array of body classes.
	 *
	 * @param array $classes Classes for the body element.
	 */
	function jetpack_post_details_body_classes( $classes ) {
		// Make sure we can proceed.
		list( $should_run, $options, $definied ) = jetpack_post_details_should_run();

		if ( ! $should_run ) {
			return $classes;
		}

		list( $date_option, $categories_option, $tags_option, $author_option, $comment_option ) = $options;
		list( $date, $categories, $tags, $author, $comment )                                    = $definied;

		// If date option is unticked, add a class of 'date-hidden' to the body.
		if ( 1 !== (int) $date_option && ! empty( $date ) ) {
			$classes[] = 'date-hidden';
		}

		// If categories option is unticked, add a class of 'categories-hidden' to the body.
		if ( 1 !== (int) $categories_option && ! empty( $categories ) ) {
			$classes[] = 'categories-hidden';
		}

		// If tags option is unticked, add a class of 'tags-hidden' to the body.
		if ( 1 !== (int) $tags_option && ! empty( $tags ) ) {
			$classes[] = 'tags-hidden';
		}

		// If author option is unticked, add a class of 'author-hidden' to the body.
		if ( 1 !== (int) $author_option && ! empty( $author ) ) {
			$classes[] = 'author-hidden';
		}

		// If comment option is unticked, add a class of 'comment-hidden' to the body.
		if ( 1 !== (int) $comment_option && ! empty( $comment ) ) {
			$classes[] = 'comment-hidden';
		}

		return $classes;
	}
	add_filter( 'body_class', 'jetpack_post_details_body_classes' );

}

if ( ! function_exists( 'jetpack_post_details_should_run' ) ) {

	/**
	 * Determines if Post Details should run.
	 */
	function jetpack_post_details_should_run() {
		// Empty value representing falsy return value.
		$void = array( false, null, null, null );

		// If the theme doesn't support 'jetpack-content-options', don't continue.
		if ( ! current_theme_supports( 'jetpack-content-options' ) ) {
			return $void;
		}

		$options      = get_theme_support( 'jetpack-content-options' );
		$post_details = ( ! empty( $options[0]['post-details'] ) ) ? $options[0]['post-details'] : null;

		// If the theme doesn't support 'jetpack-content-options[ 'post-details' ]', don't continue.
		if ( empty( $post_details ) ) {
			return $void;
		}

		$date       = ( ! empty( $post_details['date'] ) ) ? $post_details['date'] : null;
		$categories = ( ! empty( $post_details['categories'] ) ) ? $post_details['categories'] : null;
		$tags       = ( ! empty( $post_details['tags'] ) ) ? $post_details['tags'] : null;
		$author     = ( ! empty( $post_details['author'] ) ) ? $post_details['author'] : null;
		$comment    = ( ! empty( $post_details['comment'] ) ) ? $post_details['comment'] : null;

		// If there is no stylesheet and there are no date, categories, tags, author or comment declared, don't continue.
		if (
			empty( $post_details['stylesheet'] )
			&& ( empty( $date )
				|| empty( $categories )
				|| empty( $tags )
				|| empty( $author )
				|| empty( $comment ) )
		) {
			return $void;
		}

		if ( class_exists( 'Jetpack_Options' ) ) {

			$date_option       = Jetpack_Options::get_option_and_ensure_autoload( 'jetpack_content_post_details_date', 1 ); // @phan-suppress-current-line PhanUndeclaredClassMethod -- We're only running this code if the class exists.
			$categories_option = Jetpack_Options::get_option_and_ensure_autoload( 'jetpack_content_post_details_categories', 1 ); // @phan-suppress-current-line PhanUndeclaredClassMethod -- We're only running this code if the class exists.
			$tags_option       = Jetpack_Options::get_option_and_ensure_autoload( 'jetpack_content_post_details_tags', 1 ); // @phan-suppress-current-line PhanUndeclaredClassMethod -- We're only running this code if the class exists.
			$author_option     = Jetpack_Options::get_option_and_ensure_autoload( 'jetpack_content_post_details_author', 1 ); // @phan-suppress-current-line PhanUndeclaredClassMethod -- We're only running this code if the class exists.
			$comment_option    = Jetpack_Options::get_option_and_ensure_autoload( 'jetpack_content_post_details_comment', 1 ); // @phan-suppress-current-line PhanUndeclaredClassMethod -- We're only running this code if the class exists.

			$options  = array( $date_option, $categories_option, $tags_option, $author_option, $comment_option );
			$definied = array( $date, $categories, $tags, $author, $comment );

			// If all the options are ticked, don't continue.
			if ( array( 1, 1, 1, 1, 1 ) === $options ) {
				return $void;
			}

			return array( true, $options, $definied, $post_details );

		}
	}

}
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