<?php
/**
 * Plugin Name: Display Posts
 * Plugin URI: https://displayposts.com
 * Description: Display a listing of posts using the [display-posts] shortcode
 * Version: 3.0.1
 * Author: Bill Erickson
 * Author URI: https://www.billerickson.net
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License version 2, as published by the Free Software Foundation.  You may NOT assume
 * that you can use any other version of the GPL.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * @package Display Posts
 * @version 3.0.1
 * @author Bill Erickson <bill@billerickson.net>
 * @copyright Copyright (c) 2011, Bill Erickson
 * @link http://www.billerickson.net/shortcode-to-display-posts/
 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */


/**
 * To Customize, use the following filters:
 * @link https://displayposts.com/docs/filters/
 */

// Create the shortcode
add_shortcode( 'display-posts', 'be_display_posts_shortcode' );
function be_display_posts_shortcode( $atts ) {

	// Original Attributes, for filters
	$original_atts = $atts;

	// Pull in shortcode attributes and set defaults
	$atts = shortcode_atts( array(
		'author'               => '',
		'author_id'            => '',
		'category'             => '',
		'category_display'     => '',
		'category_id'          => false,
		'category_label'       => 'Posted in: ',
		'content_class'        => 'content',
		'date_format'          => '(n/j/Y)',
		'date'                 => '',
		'date_column'          => 'post_date',
		'date_compare'         => '=',
		'date_query_before'    => '',
		'date_query_after'     => '',
		'date_query_column'    => '',
		'date_query_compare'   => '',
		'display_posts_off'    => false,
		'excerpt_length'       => false,
		'excerpt_more'         => false,
		'excerpt_more_link'    => false,
		'exclude'              => false,
		'exclude_current'      => false,
		'has_password'         => null,
		'id'                   => false,
		'ignore_sticky_posts'  => false,
		'image_size'           => false,
		'include_author'       => false,
		'include_content'      => false,
		'include_date'         => false,
		'include_date_modified'=> false,
		'include_excerpt'      => false,
		'include_excerpt_dash' => true,
		'include_link'         => true,
		'include_title'        => true,
		'meta_key'             => '',
		'meta_value'           => '',
		'no_posts_message'     => '',
		'offset'               => 0,
		'order'                => 'DESC',
		'orderby'              => 'date',
		'post_parent'          => false,
		'post_parent__in'      => false,
		'post_parent__not_in'  => false,
		'post_status'          => 'publish',
		'post_type'            => 'post',
		'posts_per_page'       => '10',
		's'                    => false,
		'tag'                  => '',
		'tax_operator'         => 'IN',
		'tax_include_children' => true,
		'tax_term'             => false,
		'taxonomy'             => false,
		'time'                 => '',
		'title'                => '',
		'wrapper'              => 'ul',
		'wrapper_class'        => 'display-posts-listing',
		'wrapper_id'           => false,
	), $atts, 'display-posts' );

	// End early if shortcode should be turned off
	if( $atts['display_posts_off'] )
		return;

	$author               = sanitize_text_field( $atts['author'] );
	$author_id            = intval( $atts['author_id'] );
	$category             = sanitize_text_field( $atts['category'] );
	$category_display     = 'true' == $atts['category_display'] ? 'category' : sanitize_text_field( $atts['category_display'] );
	$category_id          = intval( $atts['category_id'] );
	$category_label       = sanitize_text_field( $atts['category_label'] );
	$content_class        = array_map( 'sanitize_html_class', ( explode( ' ', $atts['content_class'] ) ) );
	$date_format          = sanitize_text_field( $atts['date_format'] );
	$date                 = sanitize_text_field( $atts['date'] );
	$date_column          = sanitize_text_field( $atts['date_column'] );
	$date_compare         = sanitize_text_field( $atts['date_compare'] );
	$date_query_before    = sanitize_text_field( $atts['date_query_before'] );
	$date_query_after     = sanitize_text_field( $atts['date_query_after'] );
	$date_query_column    = sanitize_text_field( $atts['date_query_column'] );
	$date_query_compare   = sanitize_text_field( $atts['date_query_compare'] );
	$excerpt_length       = intval( $atts['excerpt_length'] );
	$excerpt_more         = sanitize_text_field( $atts['excerpt_more'] );
	$excerpt_more_link    = filter_var( $atts['excerpt_more_link'], FILTER_VALIDATE_BOOLEAN );
	$exclude              = $atts['exclude']; // Sanitized later as an array of integers
	$exclude_current      = filter_var( $atts['exclude_current'], FILTER_VALIDATE_BOOLEAN );
	$has_password         = null !== $atts['has_password'] ? filter_var( $atts['has_password'], FILTER_VALIDATE_BOOLEAN ) : null;
	$id                   = $atts['id']; // Sanitized later as an array of integers
	$ignore_sticky_posts  = filter_var( $atts['ignore_sticky_posts'], FILTER_VALIDATE_BOOLEAN );
	$image_size           = sanitize_key( $atts['image_size'] );
	$include_title        = filter_var( $atts['include_title'], FILTER_VALIDATE_BOOLEAN );
	$include_author       = filter_var( $atts['include_author'], FILTER_VALIDATE_BOOLEAN );
	$include_content      = filter_var( $atts['include_content'], FILTER_VALIDATE_BOOLEAN );
	$include_date         = filter_var( $atts['include_date'], FILTER_VALIDATE_BOOLEAN );
	$include_date_modified= filter_var( $atts['include_date_modified'], FILTER_VALIDATE_BOOLEAN );
	$include_excerpt      = filter_var( $atts['include_excerpt'], FILTER_VALIDATE_BOOLEAN );
	$include_excerpt_dash = filter_var( $atts['include_excerpt_dash'], FILTER_VALIDATE_BOOLEAN );
	$include_link         = filter_var( $atts['include_link'], FILTER_VALIDATE_BOOLEAN );
	$meta_key             = sanitize_text_field( $atts['meta_key'] );
	$meta_value           = sanitize_text_field( $atts['meta_value'] );
	$no_posts_message     = sanitize_text_field( $atts['no_posts_message'] );
	$offset               = intval( $atts['offset'] );
	$order                = sanitize_key( $atts['order'] );
	$orderby              = sanitize_key( $atts['orderby'] );
	$post_parent          = $atts['post_parent']; // Validated later, after check for 'current'
	$post_parent__in      = $atts['post_parent__in'];
	$post_parent__not_in  = $atts['post_parent__not_in'];
	$post_status          = $atts['post_status']; // Validated later as one of a few values
	$post_type            = sanitize_text_field( $atts['post_type'] );
	$posts_per_page       = intval( $atts['posts_per_page'] );
	$s                    = sanitize_text_field( $atts['s'] );
	$tag                  = sanitize_text_field( $atts['tag'] );
	$tax_operator         = $atts['tax_operator']; // Validated later as one of a few values
	$tax_include_children = filter_var( $atts['tax_include_children'], FILTER_VALIDATE_BOOLEAN );
	$tax_term             = sanitize_text_field( $atts['tax_term'] );
	$taxonomy             = sanitize_key( $atts['taxonomy'] );
	$time                 = sanitize_text_field( $atts['time'] );
	$shortcode_title      = sanitize_text_field( $atts['title'] );
	$wrapper              = sanitize_text_field( $atts['wrapper'] );
	$wrapper_class        = array_map( 'sanitize_html_class', ( explode( ' ', $atts['wrapper_class'] ) ) );

	if( !empty( $wrapper_class ) )
		$wrapper_class = ' class="' . implode( ' ', $wrapper_class ) . '"';
	$wrapper_id = sanitize_html_class( $atts['wrapper_id'] );
	if( !empty( $wrapper_id ) )
		$wrapper_id = ' id="' . $wrapper_id . '"';

	// Set up initial query for post
	$args = array(
		'perm' => 'readable'
	);

	// Add args if they aren't empty
	if( !empty( $category_id ) )
		$args['cat'] = $category_id;
	if( !empty( $category ) )
		$args['category_name'] = $category;
	if( !empty( $order ) )
		$args['order'] = $order;
	if( !empty( $orderby ) )
		$args['orderby'] = $orderby;
	if( !empty( $post_type ) )
		$args['post_type'] = be_dps_explode( $post_type );
	if( !empty( $posts_per_page ) )
		$args['posts_per_page'] = $posts_per_page;
	if( !empty( $s ) )
		$args['s'] = $s;
	if( !empty( $tag ) )
		$args['tag'] = $tag;

	// Date query.
	if ( ! empty( $date ) || ! empty( $time ) || ! empty( $date_query_after ) || ! empty( $date_query_before ) ) {
		$initial_date_query = $date_query_top_lvl = array();

		$valid_date_columns = array(
			'post_date', 'post_date_gmt', 'post_modified', 'post_modified_gmt',
			'comment_date', 'comment_date_gmt'
		);

		$valid_compare_ops = array( '=', '!=', '>', '>=', '<', '<=', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' );

		// Sanitize and add date segments.
		$dates = be_sanitize_date_time( $date );
		if ( ! empty( $dates ) ) {
			if ( is_string( $dates ) ) {
				$timestamp = strtotime( $dates );
				$dates = array(
					'year'   => date( 'Y', $timestamp ),
					'month'  => date( 'm', $timestamp ),
					'day'    => date( 'd', $timestamp ),
				);
			}
			foreach ( $dates as $arg => $segment ) {
				$initial_date_query[ $arg ] = $segment;
			}
		}

		// Sanitize and add time segments.
		$times = be_sanitize_date_time( $time, 'time' );
		if ( ! empty( $times ) ) {
			foreach ( $times as $arg => $segment ) {
				$initial_date_query[ $arg ] = $segment;
			}
		}

		// Date query 'before' argument.
		$before = be_sanitize_date_time( $date_query_before, 'date', true );
		if ( ! empty( $before ) ) {
			$initial_date_query['before'] = $before;
		}

		// Date query 'after' argument.
		$after = be_sanitize_date_time( $date_query_after, 'date', true );
		if ( ! empty( $after ) ) {
			$initial_date_query['after'] = $after;
		}

		// Date query 'column' argument.
		if ( ! empty( $date_query_column ) && in_array( $date_query_column, $valid_date_columns ) ) {
			$initial_date_query['column'] = $date_query_column;
		}

		// Date query 'compare' argument.
		if ( ! empty( $date_query_compare ) && in_array( $date_query_compare, $valid_compare_ops ) ) {
			$initial_date_query['compare'] = $date_query_compare;
		}

		//
		// Top-level date_query arguments. Only valid arguments will be added.
		//

		// 'column' argument.
		if ( ! empty( $date_column ) && in_array( $date_column, $valid_date_columns ) ) {
			$date_query_top_lvl['column'] = $date_column;
		}

		// 'compare' argument.
		if ( ! empty( $date_compare ) && in_array( $date_compare, $valid_compare_ops ) ) {
			$date_query_top_lvl['compare'] = $date_compare;
		}

		// Bring in the initial date query.
		if ( ! empty( $initial_date_query ) ) {
			$date_query_top_lvl[] = $initial_date_query;
		}

		// Date queries.
		$args['date_query'] = $date_query_top_lvl;
	}

	// Ignore Sticky Posts
	if( $ignore_sticky_posts )
		$args['ignore_sticky_posts'] = true;

	// Password protected content
	if( null !== $has_password )
		$args['has_password'] = $has_password;

	// Meta key (for ordering)
	if( !empty( $meta_key ) )
		$args['meta_key'] = $meta_key;

	// Meta value (for simple meta queries)
	if( !empty( $meta_value ) )
		$args['meta_value'] = $meta_value;

	// If Post IDs
	if( $id ) {
		$posts_in = array_map( 'intval', be_dps_explode( $id ) );
		$args['post__in'] = $posts_in;
	}

	// If Exclude
	$post__not_in = array();
	if( !empty( $exclude ) ) {
		$post__not_in = array_map( 'intval', be_dps_explode( $exclude ) );
	}
	if( is_singular() && $exclude_current ) {
		$post__not_in[] = get_the_ID();
	}
	if( !empty( $post__not_in ) ) {
		$args['post__not_in'] = $post__not_in;
	}

	// Post Author
	if( !empty( $author ) ) {
		if( 'current' == $author && is_user_logged_in() )
			$args['author_name'] = wp_get_current_user()->user_login;
		elseif( 'current' == $author )
			$args['meta_key'] = 'dps_no_results';
		else
			$args['author_name'] = $author;
	} elseif( !empty( $author_id ) ) {
		$args['author'] = $author_id;
	}

	// Offset
	if( !empty( $offset ) )
		$args['offset'] = $offset;

	// Post Status
	$post_status = be_dps_explode( $post_status );
	$validated = array();
	$available = array( 'publish', 'pending', 'draft', 'auto-draft', 'future', 'private', 'inherit', 'trash', 'any' );
	foreach ( $post_status as $unvalidated )
		if ( in_array( $unvalidated, $available ) )
			$validated[] = $unvalidated;
	if( !empty( $validated ) )
		$args['post_status'] = $validated;


	// If taxonomy attributes, create a taxonomy query
	if ( !empty( $taxonomy ) && !empty( $tax_term ) ) {

		if( 'current' == $tax_term ) {
			global $post;
			$terms = wp_get_post_terms(get_the_ID(), $taxonomy);
			$tax_term = array();
			foreach ($terms as $term) {
				$tax_term[] = $term->slug;
			}
		}else{
			// Term string to array
			$tax_term = be_dps_explode( $tax_term );
		}

		// Validate operator
		if( !in_array( $tax_operator, array( 'IN', 'NOT IN', 'AND' ) ) )
			$tax_operator = 'IN';

		$tax_args = array(
			'tax_query' => array(
				array(
					'taxonomy'         => $taxonomy,
					'field'            => 'slug',
					'terms'            => $tax_term,
					'operator'         => $tax_operator,
					'include_children' => $tax_include_children,
				)
			)
		);

		// Check for multiple taxonomy queries
		$count = 2;
		$more_tax_queries = false;
		while(
			isset( $original_atts['taxonomy_' . $count] ) && !empty( $original_atts['taxonomy_' . $count] ) &&
			isset( $original_atts['tax_' . $count . '_term'] ) && !empty( $original_atts['tax_' . $count . '_term'] )
		):

			// Sanitize values
			$more_tax_queries = true;
			$taxonomy = sanitize_key( $original_atts['taxonomy_' . $count] );
	 		$terms = be_dps_explode( sanitize_text_field( $original_atts['tax_' . $count . '_term'] ) );
	 		$tax_operator = isset( $original_atts['tax_' . $count . '_operator'] ) ? $original_atts['tax_' . $count . '_operator'] : 'IN';
	 		$tax_operator = in_array( $tax_operator, array( 'IN', 'NOT IN', 'AND' ) ) ? $tax_operator : 'IN';
	 		$tax_include_children = isset( $original_atts['tax_' . $count . '_include_children'] ) ? filter_var( $atts['tax_' . $count . '_include_children'], FILTER_VALIDATE_BOOLEAN ) : true;

	 		$tax_args['tax_query'][] = array(
	 			'taxonomy'         => $taxonomy,
	 			'field'            => 'slug',
	 			'terms'            => $terms,
	 			'operator'         => $tax_operator,
	 			'include_children' => $tax_include_children,
	 		);

			$count++;

		endwhile;

		if( $more_tax_queries ):
			$tax_relation = 'AND';
			if( isset( $original_atts['tax_relation'] ) && in_array( $original_atts['tax_relation'], array( 'AND', 'OR' ) ) )
				$tax_relation = $original_atts['tax_relation'];
			$args['tax_query']['relation'] = $tax_relation;
		endif;

		$args = array_merge_recursive( $args, $tax_args );
	}

	// If post parent attribute, set up parent
	if( $post_parent !== false ) {
		if( 'current' == $post_parent ) {
			global $post;
			$post_parent = get_the_ID();
		}
		$args['post_parent'] = intval( $post_parent );
	}

	if( $post_parent__in !== false )
		$args['post_parent__in'] = array_map( 'intval', be_dps_explode( $atts['post_parent__in'] ) );
	if( $post_parent__not_in !== false )
		$args['post_parent__not_in'] = array_map( 'intval', be_dps_explode( $atts['post_parent__in'] ) );

	// Set up html elements used to wrap the posts.
	// Default is ul/li, but can also be ol/li and div/div
	$wrapper_options = array( 'ul', 'ol', 'div' );
	if( ! in_array( $wrapper, $wrapper_options ) )
		$wrapper = 'ul';
	$inner_wrapper = 'div' == $wrapper ? 'div' : 'li';

	/**
	 * Filter the arguments passed to WP_Query.
	 *
	 * @since 1.7
	 *
	 * @param array $args          Parsed arguments to pass to WP_Query.
	 * @param array $original_atts Original attributes passed to the shortcode.
	 */
	global $dps_listing;
	$dps_listing = new WP_Query( apply_filters( 'display_posts_shortcode_args', $args, $original_atts ) );
	if ( ! $dps_listing->have_posts() ) {
		/**
		 * Filter content to display if no posts match the current query.
		 *
		 * @since 1.8
		 *
		 * @param string $no_posts_message Content to display, returned via {@see wpautop()}.
		 */
		return apply_filters( 'display_posts_shortcode_no_results', wpautop( $no_posts_message ) );
	}

	$inner = '';
	while ( $dps_listing->have_posts() ): $dps_listing->the_post(); global $post;

		$image = $date = $author = $excerpt = $content = '';

		if ( $include_title && $include_link ) {
			/** This filter is documented in wp-includes/link-template.php */
			$title = '<a class="title" href="' . apply_filters( 'the_permalink', get_permalink() ) . '">' . get_the_title() . '</a>';

		} elseif( $include_title ) {
			$title = '<span class="title">' . get_the_title() . '</span>';

		} else {
			$title = '';
		}

		if ( $image_size && has_post_thumbnail() && $include_link ) {
			$image = '<a class="image" href="' . get_permalink() . '">' . get_the_post_thumbnail( get_the_ID(), $image_size ) . '</a> ';

		} elseif( $image_size && has_post_thumbnail() ) {
			$image = '<span class="image">' . get_the_post_thumbnail( get_the_ID(), $image_size ) . '</span> ';

		}

		if ( $include_date ) {
			$date = 'relative' == $date_format ? be_dps_relative_date( get_the_date( 'U' ) ) : get_the_date( $date_format );
		} elseif ( $include_date_modified ) {
			$date = 'relative' == $date_format ? be_dps_relative_date( get_the_modified_time( 'U' ) ) : get_the_modified_date( $date_format );
		}
		if( !empty( $date ) ) {
			$date = ' <span class="date">' . $date . '</span>';
		}

		if( $include_author )
			/**
			 * Filter the HTML markup to display author information for the current post.
			 *
			 * @since Unknown
			 *
			 * @param string $author_output HTML markup to display author information.
			 */
			$author = apply_filters( 'display_posts_shortcode_author', ' <span class="author">by ' . get_the_author() . '</span>', $original_atts );

		if ( $include_excerpt ) {

			// Custom build excerpt based on shortcode parameters
			if( $excerpt_length || $excerpt_more || $excerpt_more_link ) {

				$length = $excerpt_length ? $excerpt_length : apply_filters( 'excerpt_length', 55 );
				$more   = $excerpt_more ? $excerpt_more : apply_filters( 'excerpt_more', '' );
				$more   = $excerpt_more_link ? ' <a class="excerpt-more" href="' . get_permalink() . '">' . $more . '</a>' : ' <span class="excerpt-more">' . $more . '</span>';

				if( has_excerpt() && apply_filters( 'display_posts_shortcode_full_manual_excerpt', false ) ) {
					$excerpt = $post->post_excerpt . $more;
				} elseif( has_excerpt() ) {
					$excerpt = wp_trim_words( strip_shortcodes( $post->post_excerpt ), $length ) . $more;
				} else {
					$excerpt = wp_trim_words( strip_shortcodes( $post->post_content ), $length ) . $more;
				}


			// Use default, can customize with WP filters
			} else {
				$excerpt = get_the_excerpt();
			}

			$excerpt = '<span class="excerpt">' . $excerpt . '</span>';
			if( $include_excerpt_dash ) {
				$excerpt = '<span class="excerpt-dash">-</span> ' . $excerpt;
			}

		}

		if( $include_content ) {
			add_filter( 'shortcode_atts_display-posts', 'be_display_posts_off', 10, 3 );
			/** This filter is documented in wp-includes/post-template.php */
			$content = '<div class="' . implode( ' ', $content_class ) . '">' . apply_filters( 'the_content', get_the_content() ) . '</div>';
			remove_filter( 'shortcode_atts_display-posts', 'be_display_posts_off', 10, 3 );
		}

		// Display categories the post is in
		$category_display_text = '';
		if( $category_display && is_object_in_taxonomy( get_post_type(), $category_display ) ) {
			$terms = get_the_terms( get_the_ID(), $category_display );
			$term_output = array();
			foreach( $terms as $term )
				$term_output[] = '<a href="' . get_term_link( $term, $category_display ) . '">' . $term->name . '</a>';
			$category_display_text = ' <span class="category-display"><span class="category-display-label">' . $category_label . '</span> ' . implode( ', ', $term_output ) . '</span>';

			/**
			 * Filter the list of categories attached to the current post.
			 *
			 * @since 2.4.2
			 *
			 * @param string   $category_display Current Category Display text
			 */
			$category_display_text = apply_filters( 'display_posts_shortcode_category_display', $category_display_text, $terms, $category_display, $original_atts );

		}

		$class = array( 'listing-item' );

		/**
		 * Filter the post classes for the inner wrapper element of the current post.
		 *
		 * @since 2.2
		 *
		 * @param array    $class         Post classes.
		 * @param WP_Post  $post          Post object.
		 * @param WP_Query $dps_listing       WP_Query object for the posts listing.
		 * @param array    $original_atts Original attributes passed to the shortcode.
		 */
		$class = array_map( 'sanitize_html_class', apply_filters( 'display_posts_shortcode_post_class', $class, $post, $dps_listing, $original_atts ) );
		$output = '<' . $inner_wrapper . ' class="' . implode( ' ', $class ) . '">' . $image . $title . $date . $author . $category_display_text . $excerpt . $content . '</' . $inner_wrapper . '>';

		/**
		 * Filter the HTML markup for output via the shortcode.
		 *
		 * @since 0.1.5
		 *
		 * @param string $output        The shortcode's HTML output.
		 * @param array  $original_atts Original attributes passed to the shortcode.
		 * @param string $image         HTML markup for the post's featured image element.
		 * @param string $title         HTML markup for the post's title element.
		 * @param string $date          HTML markup for the post's date element.
		 * @param string $excerpt       HTML markup for the post's excerpt element.
		 * @param string $inner_wrapper Type of container to use for the post's inner wrapper element.
		 * @param string $content       The post's content.
		 * @param string $class         Space-separated list of post classes to supply to the $inner_wrapper element.
		 * @param string $author 		HTML markup for the post's author.
		 * @param string $category_display_text
		 */
		$inner .= apply_filters( 'display_posts_shortcode_output', $output, $original_atts, $image, $title, $date, $excerpt, $inner_wrapper, $content, $class, $author, $category_display_text );

	endwhile; wp_reset_postdata();

	/**
	 * Filter the shortcode output's opening outer wrapper element.
	 *
	 * @since 1.7
	 *
	 * @param string $wrapper_open  HTML markup for the opening outer wrapper element.
	 * @param array  $original_atts Original attributes passed to the shortcode.
	 * @param object $dps_listing, WP Query object
	 */
	$open = apply_filters( 'display_posts_shortcode_wrapper_open', '<' . $wrapper . $wrapper_class . $wrapper_id . '>', $original_atts, $dps_listing );

	/**
	 * Filter the shortcode output's closing outer wrapper element.
	 *
	 * @since 1.7
	 *
	 * @param string $wrapper_close HTML markup for the closing outer wrapper element.
	 * @param array  $original_atts Original attributes passed to the shortcode.
	 * @param object $dps_listing, WP Query object
	 */
	$close = apply_filters( 'display_posts_shortcode_wrapper_close', '</' . $wrapper . '>', $original_atts, $dps_listing );

	$return = '';

	if( $shortcode_title ) {

		/**
		 * Filter the shortcode output title tag element.
		 *
		 * @since 2.3
		 *
		 * @param string $tag           Type of element to use for the output title tag. Default 'h2'.
		 * @param array  $original_atts Original attributes passed to the shortcode.
		 */
		$title_tag = apply_filters( 'display_posts_shortcode_title_tag', 'h2', $original_atts );

		$return .= '<' . $title_tag . ' class="display-posts-title">' . $shortcode_title . '</' . $title_tag . '>' . "\n";
	}

	$return .= $open . $inner . $close;

	return $return;
}

/**
 * Sanitize the segments of a given date or time for a date query.
 *
 * Accepts times entered in the 'HH:MM:SS' or 'HH:MM' formats, and dates
 * entered in the 'YYYY-MM-DD' format.
 *
 * @param string $date_time      Date or time string to sanitize the parts of.
 * @param string $type           Optional. Type of value to sanitize. Accepts
 *                               'date' or 'time'. Default 'date'.
 * @param bool   $accepts_string Optional. Whether the return value accepts a string.
 *                               Default false.
 * @return array|string Array of valid date or time segments, a timestamp, otherwise
 *                      an empty array.
 */
function be_sanitize_date_time( $date_time, $type = 'date', $accepts_string = false ) {
	if ( empty( $date_time ) || ! in_array( $type, array( 'date', 'time' ) ) ) {
		return array();
	}

	$segments = array();

	/*
	 * If $date_time is not a strictly-formatted date or time, attempt to salvage it with
	 * as strototime()-ready string. This is supported by the 'date', 'date_query_before',
	 * and 'date_query_after' attributes.
	 */
	if (
		true === $accepts_string
		&& ( false !== strpos( $date_time, ' ' ) || false === strpos( $date_time, '-' ) )
	) {
		if ( false !== $timestamp = strtotime( $date_time ) ) {
			return $date_time;
		}
	}

	$parts = array_map( 'absint', explode( 'date' == $type ? '-' : ':', $date_time ) );

	// Date.
	if ( 'date' == $type ) {
		// Defaults to 2001 for years, January for months, and 1 for days.
		$year = $month = $day = 1;

		if ( count( $parts ) >= 3 ) {
			list( $year, $month, $day ) = $parts;

			$year  = ( $year  >= 1 && $year  <= 9999 ) ? $year  : 1;
			$month = ( $month >= 1 && $month <= 12   ) ? $month : 1;
			$day   = ( $day   >= 1 && $day   <= 31   ) ? $day   : 1;
		}

		$segments = array(
			'year'  => $year,
			'month' => $month,
			'day'   => $day
		);

	// Time.
	} elseif ( 'time' == $type ) {
		// Defaults to 0 for all segments.
		$hour = $minute = $second = 0;

		switch( count( $parts ) ) {
			case 3 :
				list( $hour, $minute, $second ) = $parts;
				$hour   = ( $hour   >= 0 && $hour   <= 23 ) ? $hour   : 0;
				$minute = ( $minute >= 0 && $minute <= 60 ) ? $minute : 0;
				$second = ( $second >= 0 && $second <= 60 ) ? $second : 0;
				break;
			case 2 :
				list( $hour, $minute ) = $parts;
				$hour   = ( $hour   >= 0 && $hour   <= 23 ) ? $hour   : 0;
				$minute = ( $minute >= 0 && $minute <= 60 ) ? $minute : 0;
				break;
			default : break;
		}

		$segments = array(
			'hour'   => $hour,
			'minute' => $minute,
			'second' => $second
		);
	}

	/**
	 * Filter the sanitized segments for the given date or time string.
	 *
	 * @since 2.5
	 *
	 * @param array  $segments  Array of sanitized date or time segments, e.g. hour, minute, second,
	 *                          or year, month, day, depending on the value of the $type parameter.
	 * @param string $date_time Date or time string. Dates are formatted 'YYYY-MM-DD', and times are
	 *                          formatted 'HH:MM:SS' or 'HH:MM'.
	 * @param string $type      Type of string to sanitize. Can be either 'date' or 'time'.
	 */
	return apply_filters( 'display_posts_shortcode_sanitized_segments', $segments, $date_time, $type );
}

/**
 * Turn off display posts shortcode
 * If display full post content, any uses of [display-posts] are disabled
 *
 * @param array $out, returned shortcode values
 * @param array $pairs, list of supported attributes and their defaults
 * @param array $atts, original shortcode attributes
 * @return array $out
 */
function be_display_posts_off( $out, $pairs, $atts ) {
	/**
	 * Filter whether to disable the display-posts shortcode.
	 *
	 * The function and filter were added for backward-compatibility with
	 * 2.3 behavior in certain circumstances.
	 *
	 * @since 2.4
	 *
	 * @param bool $disable Whether to disable the display-posts shortcode. Default true.
	 */
	$out['display_posts_off'] = apply_filters( 'display_posts_shortcode_inception_override', true );
	return $out;
}

/**
 * Explode list using "," and ", "
 *
 */
function be_dps_explode( $string = '' ) {

	$string = str_replace( ', ', ',', $string );
	return explode( ',', $string );
}

/**
 * Relative date
 *
 */
function be_dps_relative_date( $date ) {
	return human_time_diff( $date ) . ' ' . __( 'ago', 'display-posts' );
}

/**
 * Survey admin notice
 *
 */
function be_dps_survey_admin_notice() {

	if( ! is_super_admin() )
		return;


	$survey = get_option( 'display_posts_survey' );
	$time   = time();
	$load   = false;
	if ( ! $survey ) {
		$survey = array(
			'time'      => $time,
			'dismissed' => false,
		);
		update_option( 'display_posts_survey', $survey );
	} else {
		// Check if it has been dismissed or not.
		if ( ( isset( $survey['dismissed'] ) && ! $survey['dismissed'] ) ) {
			$load = true;
		}
	}
	// If we cannot load, return early.
	if ( ! $load ) {
		return;
	}


	?>
		<div class="notice notice-info is-dismissible display-posts-survey-notice">
			<p><?php esc_html_e( 'Thank you so much for using Display Posts! Could you please do me a BIG favor and answer four quick questions on how I can improve the plugin for you?', 'display-posts' ); ?></p>
			<p><?php esc_html_e( 'In 2019 I\'ll be working on new features, including the possibility of a premium version. As a valued Display Posts user, your feedback is important and appreciated!', 'display-posts' ); ?></p>
			<p><strong><?php echo wp_kses( __( '~ Bill Erickson<br>Developer of Display Posts', 'display-posts' ), array( 'br' => array() ) ); ?></strong></p>
			<p>
				<a href="https://displayposts.com/user-survey?utm_source=displaypostsplugin&utm_medium=link&utm_campaign=survey_notice" class="display-posts-dismiss-survey-notice display-posts-survey-out" target="_blank" rel="noopener"><?php esc_html_e( 'Yes, I will!', 'display-posts' ); ?></a><br>
				<a href="#" class="display-posts-dismiss-survey-notice" target="_blank" rel="noopener noreferrer"><?php esc_html_e( 'Nope, maybe later', 'display-posts' ); ?></a><br>
				<a href="#" class="display-posts-dismiss-survey-notice" target="_blank" rel="noopener noreferrer"><?php esc_html_e( 'I already did', 'display-posts' ); ?></a>
			</p>
		</div>
		<script type="text/javascript">
			jQuery( document ).ready( function ( $ ) {
				$( document ).on( 'click', '.display-posts-dismiss-survey-notice, .display-posts-survey-notice button', function ( event ) {
					if ( ! $( this ).hasClass( 'display-posts-survey-out' ) ) {
						event.preventDefault();
					}
					$.post( ajaxurl, {
						action: 'display_posts_survey_dismiss'
					} );
					$( '.display-posts-survey-notice' ).remove();
				} );
			} );
		</script>
	<?php
}
add_action( 'admin_notices', 'be_dps_survey_admin_notice' );

/**
 * Dismiss the admin notice
 *
 */
function be_dps_survey_dismiss() {

	$survey              = get_option( 'display_posts_survey', array() );
	$survey['time']      = time();
	$survey['dismissed'] = true;
	update_option( 'display_posts_survey', $survey );
}
add_action( 'wp_ajax_display_posts_survey_dismiss', 'be_dps_survey_dismiss' );