Add feature : exclude the selected category

Hi,

Your plugin is very good because it is light and very simple. I propose to add the reverse mode : You can display a specific category, why not displaying all except this specific category ?

Here is the modified code.

Regards

function form( $instance ) {

	$defaults  = array( 'title' => '', 'category' => '', 'number' => 5, 'show_date' => '', 'exclude' => '' );
	$instance  = wp_parse_args( ( array ) $instance, $defaults );
	$title     = $instance['title'];
	$category  = $instance['category'];
	$number    = $instance['number'];
	$show_date = $instance['show_date'];
	$exclude   = $instance['exclude'];
	
	?>
	
	<p>
		<label for="rpjc_widget_cat_recent_posts_title"><?php _e( 'Title' ); ?>:</label>
		<input type="text" class="widefat" id="rpjc_widget_cat_recent_posts_title" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo esc_attr( $title ); ?>" />
	</p>
	
	<p>
		<label for="rpjc_widget_cat_recent_posts_category"><?php _e( 'Category' ); ?>:</label>				
		
		<?php

		wp_dropdown_categories( array(

			'orderby'    => 'title',
			'hide_empty' => false,
			'name'       => $this->get_field_name( 'category' ),
			'id'         => 'rpjc_widget_cat_recent_posts_category',
			'class'      => 'widefat',
			'selected'   => $category

		) );

		?>

	</p>
	
	<p>
		<input type="checkbox" id="rpjc_widget_cat_recent_posts_exclude" class="checkbox" name="<?php echo $this->get_field_name( 'exclude' ); ?>" <?php checked( $exclude, 1 ); ?> />
		<label for="rpjc_widget_cat_recent_posts_exclude"><?php _e( 'Exclude selected category (reverse mode) ?' ); ?></label>
	</p>

	<p>
		<label for="rpjc_widget_cat_recent_posts_number"><?php _e( 'Number of posts to show' ); ?>: </label>
		<input type="text" id="rpjc_widget_cat_recent_posts_number" name="<?php echo $this->get_field_name( 'number' ); ?>" value="<?php echo esc_attr( $number ); ?>" size="3" />
	</p>

	<p>
		<input type="checkbox" id="rpjc_widget_cat_recent_posts_show_date" class="checkbox" name="<?php echo $this->get_field_name( 'show_date' ); ?>" <?php checked( $show_date, 1 ); ?> />
		<label for="rpjc_widget_cat_recent_posts_show_date"><?php _e( 'Display post date?' ); ?></label>
	</p>
	
	<?php

}

// Save widget settings

function update( $new_instance, $old_instance ) {

	$instance              = $old_instance;
	$instance['title']     = wp_strip_all_tags( $new_instance['title'] );
	$instance['category']  = wp_strip_all_tags( $new_instance['category'] );
	$instance['number']    = is_numeric( $new_instance['number'] ) ? intval( $new_instance['number'] ) : 5;
	$instance['show_date'] = isset( $new_instance['show_date'] ) ? 1 : 0;
	$instance['exclude']   = isset( $new_instance['exclude'] ) ? 1 : 0;

	return $instance;

}

// Display widget

function widget( $args, $instance ) {

	extract( $args );

	echo $before_widget;

	$title     = apply_filters( 'widget_title', $instance['title'], $instance, $this->id_base );
	$category  = $instance['category'];
	$number    = $instance['number'];
	$show_date = ( $instance['show_date'] === 1 ) ? true : false;
	$exclude   = ( $instance['exclude'] === 1 ) ? true : false;

	if ( !empty( $title ) ) echo $before_title . $title . $after_title;

	$query = array( 
		'post_type'      => 'post',
		'posts_per_page' => $number
		);
	if(!$exclude) $query['cat'] = $category;
	else $query['category__not_in'] = $category;
	
	$cat_recent_posts = new WP_Query($query);