p2-resolved-posts.php

<?php
/* Plugin Name: P2 Resolved Posts
 * Description: Allows you to mark P2 posts for resolution.
 * Author: Andrew Nacin
 * Author URI: http://andrewnacin.com/
 */

/* WARNING about studying and copying this code:
 * 
 * P2 is not currently an ideal platform for developing extensions. Some of this
 * plugin is hacky and may make kittens and core developers cry. It is not
 * guaranteed to work as-is in a future version of P2. While I'll keep it updated
 * to work, please do your best to avoid these techniques. Do as I say, not as I do.
 *
 * -- Nacin
 */

/**
 * @package P2_Resolved_Posts
 */
class P2_Resolved_Posts {

	static $instance;

	/**
	 * Constructor. Saves instance and sets up initial hook.
	 */
	function __construct() {
		self::$instance = $this;
		add_action( 'after_setup_theme', array( $this, 'after_setup_theme' ) );
		register_activation_hook( __FILE__, array( $this, 'activate' ) );
	}

	/**
	 * Sets up initial hooks, if the P2 theme is in play.
	 */
	function after_setup_theme() {
		if ( ! class_exists( 'P2' ) )
			return;
		add_action( 'wp_head', array( $this, 'wp_head' ) );
		add_action( 'wp_footer', array( $this, 'wp_footer' ) );
		add_action( 'p2_action_links', array( $this, 'p2_action_links' ) );
		add_filter( 'post_class', array( $this, 'post_class' ), 10, 3 );
		add_action( 'admin_post_p2_resolve', array( $this, 'admin_post_p2_resolve' ) );
		add_action( 'widgets_init', array( $this, 'widgets_init' ) );
		add_filter( 'request', array( $this, 'request' ) );
		$this->register_taxonomy();
	}

	function register_taxonomy() {
			register_taxonomy( 'p2_resolved', 'post', array(
			'public' => true,
			'query_var' => 'resolved',
			'rewrite' => false,
			'show_ui' => false,
		) );
	}

	function activate() {
		$this->register_taxonomy();
		if ( ! term_exists( 'unresolved', 'p2_resolved' ) )
			wp_insert_term( 'unresolved', 'p2_resolved' );
	}

	function request( $qvs ) {
		if ( ! isset( $qvs['resolved'] ) )
			return $qvs;

		if ( ! in_array( $qvs['resolved'], array( 'resolved', 'unresolved' ) ) ) {
			unset( $qvs['resolved'] );
			return $qvs;
		}

		add_action( 'parse_query', array( $this, 'parse_query' ) );
		add_filter( 'template_include', array( $this, 'force_home_template' ) );

		if ( 'resolved' == $qvs['resolved'] )
			return $qvs;

		unset( $qvs['resolved'] );

		if ( ! isset( $qvs['tax_query'] ) )
			$qvs['tax_query'] = array();

		$qvs['tax_query'][] = array(
			'taxonomy' => 'p2_resolved',
			'terms' => array( 'resolved' ),
			'field' => 'slug',
			'operator' => 'NOT IN',
		);

		return $qvs;
	}

	function parse_query( $query ) {
		$query->is_home = true; // Force home detection.
	}

	function force_home_template() {
		return get_home_template();
	}

	function widgets_init() {
		register_widget( 'P2_Resolved_Posts_Widget' );
	}

	/**
	 * Adds 'Private Post' near the action links.
	 */
	function p2_action_links() {
		if ( ! current_user_can( 'manage_options' ) )
			return;

		$go = add_query_arg( array(
				'action' => 'p2_resolve',
				'post' => get_the_ID(),
				'_wp_http_referer' => urlencode( stripslashes( $_SERVER['REQUEST_URI'] ) )
			), admin_url( 'admin-post.php' ) );

		$go = wp_nonce_url( $go, 'p2_resolve-' . get_the_ID() );

		if ( has_term( 'resolved', 'p2_resolved', get_the_ID() ) ) {
			$go = add_query_arg( 'unresolve', '1', $go );
			echo ' | <strong class="p2-resolve"><span class="label">' . __( 'Resolved', 'p2-resolved-posts' ) . '</span> <a class="unresolve" href="' . esc_attr( $go ) . '">' . __( 'Undo', 'p2-resolved-posts' ) . '</a></strong>';
		} else {
			echo ' | <strong class="p2-resolve"><span class="label"></span> <a class="resolve" href="' . esc_attr( $go ) . '">' . __( 'Mark as Resolved', 'p2-resolved-posts' ) . '</a></strong>';
		}
	}

	function post_class( $classes, $class, $post_id ) {
		if ( ! is_single() && has_term( 'resolved', 'p2_resolved', $post_id ) )
			$classes[] = 'status-resolved';
		return $classes;
	}

	function admin_post_p2_resolve() {
		$post_id = absint( $_GET['post'] );

		if ( ! current_user_can( 'manage_options' ) )
			wp_die( __( "You can't do that.", 'p2-resolved-posts' ) );

		if ( ! wp_verify_nonce( $_GET['_wpnonce'], 'p2_resolve-' . $post_id ) )
			wp_die( __( 'Did you intend to do this?', 'p2-resolved-posts' ) );

		if ( ! empty( $_GET['unresolve'] ) )
			wp_set_object_terms( $post_id, array(), 'p2_resolved' );
		else
			wp_set_object_terms( $post_id, array( 'resolved' ), 'p2_resolved' );

		wp_safe_redirect( wp_get_referer() );
		die();
	}

	/**
	 * Drop in some CSS.
	 */
	function wp_head() {
		echo "<style> span.actions { padding-right: 3px; }
li.status-resolved { opacity: .5; }
strong.p2-resolve { color: #000; } </style>\n";
	}

	/**
	 * Drop in some JS.
	 */
	function wp_footer() {
?>
<script>
(function($){
	$(document).ready( function() {
		$('.p2-resolve a').click( function(e) {
			e.preventDefault();
			$.ajax({
				url : $(this).attr('href'),
				context : $(this),
				success : function() {
					if ( $(this).hasClass('resolve') ) {
						$(this).removeClass('resolve').addClass('unresolve');
						$(this).attr('href', $(this).attr('href') + '&unresolve=1');
						$(this).closest('li').addClass('status-resolved');
						$(this).prev().text('<?php echo esc_js( __( 'Resolved', 'p2-resolved-posts' ) ); ?>');
						$(this).text('<?php echo esc_js( __( 'Undo', 'p2-resolved-posts' ) ); ?>');
					} else {
						$(this).removeClass('unresolve').addClass('resolve');
						$(this).attr('href', $(this).attr('href').replace('&unresolve=1', '') );						$(this).closest('li').removeClass('status-resolved');
						$(this).prev().text('');
						$(this).text('<?php echo esc_js( __( 'Mark as Resolved', 'p2-resolved-posts' ) ); ?>');
					}
				}
			});
		});
	});
})(jQuery);
</script>
<?php
	}

}
new P2_Resolved_Posts;


/**
 * Search widget class
 *
 * @since 2.8.0
 */
class P2_Resolved_Posts_Widget extends WP_Widget {

	function __construct() {
		$widget_ops = array(
			'classname' => 'p2-resolved-posts',
			'description' => __( 'Allows querying of resolved and unresolved posts', 'p2-resolved-posts' )
		);
		parent::__construct( 'p2_resolved_posts', __( 'P2 Resolved Posts' ), $widget_ops);
	}

	function widget( $args, $instance ) {
		extract( $args );
		$title = apply_filters( 'widget_title', $instance['title'], $instance, $this->id_base );

		echo $before_widget;
		if ( $title )
			echo $before_title . $title . $after_title;

?>
<ul>
<?php if ( is_home() && isset( $_GET['resolved'] ) && $_GET['resolved'] == 'unresolved' ) : ?>
	<li><strong>&bull; <?php _e( 'Show <strong>unresolved</strong> threads', 'p2-resolved-posts' ); ?></strong></li>
<?php else : ?>
	<li><a href="<?php echo esc_url( add_query_arg( 'resolved', 'unresolved', home_url() ) ); ?>"><?php _e( 'Show <strong>unresolved</strong> threads', 'p2-resolved-posts' ); ?></a></li>
<?php endif; ?>

<?php if ( is_tax( 'p2_resolved', 'resolved' ) ) : ?>
	<li><strong>&bull; <?php _e( 'Show resolved threads', 'p2-resolved-posts' ); ?></strong></li>
<?php else : ?>
	<li><a href="<?php echo esc_url( add_query_arg( 'resolved', 'resolved', home_url() ) ); ?>"><?php _e( 'Show resolved threads', 'p2-resolved-posts' ); ?></a></li>
<?php endif; ?>

<?php if ( is_home() && ! isset( $_GET['resolved'] ) ) : ?>
	<li><strong>&bull; <?php _e( 'Show all threads', 'p2-resolved-posts' ); ?></strong></li>
<?php else : ?>
	<li><a href="<?php echo esc_url( home_url() ); ?>"><?php _e( 'Show all threads', 'p2-resolved-posts' ); ?></a></li>
<?php endif; ?>
</ul>

<?php
	
		echo $after_widget;
	}

	function form( $instance ) {
		$instance = wp_parse_args( (array) $instance, array( 'title' => '') );
		$title = $instance['title'];
?>
		<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($title); ?>" /></label></p>
<?php
	}

	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$new_instance = wp_parse_args((array) $new_instance, array( 'title' => ''));
		$instance['title'] = strip_tags($new_instance['title']);
		return $instance;
	}

}