gistfile1.php

<?php
   /*
   Plugin Name: Bezdelniki.org ajax filter
   Plugin URI: http://vk.com/nimdraug
   Description: a plugin to get posts through ajax request
   Version: 0.1
   Author: Aleksei Shaikhaleev
   Author URI: http://vk.com/nimdraug
   License: GPL2
   */

	add_action("wp_ajax_get_events", "bezdelniki_ajax_filter_get_events");
	add_action("wp_ajax_nopriv_get_events", "bezdelniki_ajax_filter_get_events");

	add_action( 'init', 'bezdelniki_ajax_filter_script_enqueuer' );

	function bezdelniki_ajax_filter_script_enqueuer() {
		wp_register_script( "bezdelniki-filter", WP_PLUGIN_URL.'/bezdelniki-ajax-filter/js/bezdelniki-filter.js', array('jquery') );
		wp_register_script( "date_js", WP_PLUGIN_URL.'/bezdelniki-ajax-filter/js/date.js' );
		wp_register_script( "waypoints.min", WP_PLUGIN_URL.'/bezdelniki-ajax-filter/js/waypoints.min.js' );
		wp_register_script( "waypoints-sticky.min", WP_PLUGIN_URL.'/bezdelniki-ajax-filter/js/waypoints-sticky.min.js' );
		wp_register_script( "jquery.simplemodal", WP_PLUGIN_URL.'/bezdelniki-ajax-filter/js/jquery.simplemodal.js' );
		wp_localize_script( 'bezdelniki-filter', 'nonce', wp_create_nonce("get_events_nonce") );        

		wp_enqueue_script( 'jquery' );
		wp_enqueue_script( 'date_js' );
		wp_enqueue_script( 'waypoints.min' );
		wp_enqueue_script( 'waypoints-sticky.min' );
		wp_enqueue_script( 'jquery.simplemodal' );
		wp_enqueue_script( 'bezdelniki-filter' );
	}

	function filter_where_for_week( $where = '' ) {
		$where .= " AND post_date > '" . date('Y-m-d', strtotime('-0 day')) . "' AND post_date < '" . date('Y-m-d', strtotime('+7 day')) . "'";
		return $where;
	}

	function filter_where_for_future( $where = '' ) {
		$where .= " AND post_date > '" . date('Y-m-d', strtotime('-0 day')) . "'";
		return $where;
	}

	function filter_where_for_days( $where = '' ) {
		global $days;
		$where .= " AND date_format(post_date, '%Y-%m-%d') in ($days)"; 
		// $where .= " AND post_date > '" . date('Y-m-d', strtotime('-0 day')) . "' AND post_date < '" . date('Y-m-d', strtotime('+7 day')) . "'";
		return $where;
	}

	// function filter_where_for_days( $where = '' ) {
	// 	global $days;
	// 	$where .= " AND date_format(post_date, '%Y-%m-%d') in ($days)"; 
	// 	echo $where;
	// }


	function bezdelniki_ajax_filter_get_events() {
		if ( !wp_verify_nonce( $_REQUEST['nonce'], "get_events_nonce")) {
			exit("No naughty business please");
		}

		$tomorrow = mktime(0, 0, 0, date("m"), date("d")+1, date("y"));

		switch ($_REQUEST['time']) {
		 	case 'today':
		 		$args = array(
					'year'     	=> date('Y'),
					'monthnum' 	=> date('m'),
					'day' 		 	=> date('j'),
					'post_type' => 'post',
					'order'    	=> 'ASC'
				);
				$custom_query = new WP_Query( $args );
		 		break;
		 	case 'tomorrow':
			 	$args = array(
					'year'     	=> date('Y', $tomorrow),
					'monthnum' 	=> date('m', $tomorrow),
					'day' 		 	=> date('j', $tomorrow),
					'post_type' => 'post',
					'order'    	=> 'ASC'
				);
				$custom_query = new WP_Query( $args );
		 		break;
		 	case 'week':
			 	add_filter('posts_where', 'filter_where_for_week');  
			 	$args = array(
					'post_type' => 'post',
					'order'    	=> 'ASC'
				);
				$custom_query = new WP_Query( $args );
		 		remove_filter('posts_where', 'filter_where_for_week');  
		 		break;
		 	case 'future':
			 	add_filter('posts_where', 'filter_where_for_future');  
			 	$args = array(
					'post_type' => 'post',
					'order'    	=> 'ASC'
				);
				$custom_query = new WP_Query( $args );
				remove_filter('posts_where', 'filter_where_for_future');
		 		break;
		 	default:
		 		$days = $_REQUEST['time'];
		 		$days_array = split(',', $days);
		 		for ($i = 0; $i < count($days_array); $i++) {
					$days_array[$i] = "'" . $days_array[$i] . "'";	 			
		 		}
				global $days;
		 		$days = implode(',', $days_array);

		 		add_filter('posts_where', 'filter_where_for_days');  
		 		$args = array(
					'post_type' => 'post',
					'order'    	=> 'ASC'
				);
				$custom_query = new WP_Query( $args );
				remove_filter('posts_where', 'filter_where_for_days');
		 		break;
		 } 
				
		while ( $custom_query->have_posts() ) {
			$custom_query->the_post();
			$result[] = load_template_part( 'content', get_post_format() ); 
		}

		if (count($result) == 0) {
			$result[] = "<h2>Ни одного события не найдено, может, выбрать другую дату?</h2>";
		}

		echo json_encode($result);
		wp_reset_query();
		die();
	}

	function load_template_part($template_name, $part_name=null) {
    ob_start();
    get_template_part($template_name, $part_name);
    $var = ob_get_contents();
    ob_end_clean();
    return $var;
	}

class AnticaffeeEventsWidget extends WP_Widget
{
  function AnticaffeeEventsWidget()
  {
    $widget_ops = array('classname' => 'AnticaffeeEventsWidget', 'description' => 'Показывает ближайшие события анти-кафе' );
    $this->WP_Widget('AnticaffeeEventsWidget', 'События анти-кафе', $widget_ops);
  }
 
  function form($instance)
  {
    $instance = wp_parse_args( (array) $instance, array( 'title' => '' ) );
    $title = $instance['title'];
?>
  <p><label for="<?php echo $this->get_field_id('title'); ?>">Title: <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo attribute_escape($title); ?>" /></label></p>
<?php
  }
 
  function update($new_instance, $old_instance)
  {
    $instance = $old_instance;
    $instance['title'] = $new_instance['title'];
    return $instance;
  }
 
  function widget($args, $instance)
  {
    extract($args, EXTR_SKIP);
 
    echo $before_widget;
    $title = empty($instance['title']) ? ' ' : apply_filters('widget_title', $instance['title']);
 
    if (!empty($title))
      echo $before_title . $title . $after_title;;
 
		echo "<div class='anticaffee_widget_container sticky'><img src='/images/anticaffee_title.png'>";


		function filter_where( $where = '' ) {
			$where .= " AND post_date > '" . date('Y-m-d') . "'";
			return $where;
		}
					
		add_filter('posts_where', 'filter_where');  

		$args = array(
			'posts_per_page' => 20,
			'tag' => 'антикафе',
			'order'    => 'ASC'
		);

		$custom_query = new WP_Query( $args );
		if ( $custom_query->have_posts() ):
			while ( $custom_query->have_posts() ) :
			$custom_query->the_post();
			$magic_days[get_the_time('Y-m-d')][] = "<a href='".get_permalink()."'>".get_the_time('G:i')." ".get_the_title()."</a>";
			endwhile;
		endif;
		wp_reset_query();
		remove_filter('posts_where', 'filter_where');  

		$magic_days;

		$month_names_owned = array(	0 => 'января',
															 	1 => 'февраля',
															 	2 => 'марта',
															 	3 => 'апреля',
															 	4 => 'мая',
															 	5 => 'июня',
															 	6 => 'июля',
															 	7 => 'августа',
															 	8 => 'сентября',
															 	9 => 'октября',
															 	10 =>'ноября',
															 	11 =>'декабря' );

		foreach ($magic_days as $day => $events) {
			$day_splitted = split('-',$day);
			echo "<p>";
			echo intval($day_splitted[2]);
			echo " ";
			echo $month_names_owned[intval($day_splitted[1])-1];
			echo "</p>";
			foreach ($events as $html) {
				echo "<p>$html</p>";
			}
		}
		echo "</div>";

	  echo $after_widget;
  }
 
}
add_action( 'widgets_init', create_function('', 'return register_widget("AnticaffeeEventsWidget");') );

?>