Bug #18, work-in-progress filter plugin; [iet:7791015][iet:7800747]

* Plus, Guide-case study flag, in `Simple_Menu` plugin

simple_menu.php

@@ -103,13 +103,16 @@ protected function display_content( $sub_menu, $menu_id, $classes, $show_comment
       <?php echo apply_filters('the_content', get_post_field( 'post_content', $it->object_id )) ?>
       <?php self::display_comments( $it->object_id, $show_comments ) ?>
     </div>
+
+    <?php if ( defined( 'TTTT_GUIDE_CASE_STUDY' ) ): ?>
     <div class="col-md-3 case-study">
         <!-- Tricky topics guide -->
         <p><img src="/wp-content/themes/tttt-guide/images/default-case-study.png" alt="" /></p>
         <h4 class="cs-title"> Case study </h4>
         <?php echo apply_filters( 'lorem_small', null ) ?>
         <a href="#view-more" role="button" data-toggle="tooltip" title="View the case study.">View more</a>
     </div>
+    <?php endif; ?>
 
     <?php if ( $with_top_link ): ?>
         <div class="col-md-12"><a href="#site-main" class="col-md-9 tttt-to-top">Return to top of page</a></div>

work-in-progress-filter.php

@@ -0,0 +1,38 @@
+<?php namespace IET_OU\WP_Generic_Plugins;
+
+/**
+ * Plugin Name: Work-in-progress
+ * Plugin URI:
+ * Description: ...
+ * Author:      Nick Freear
+ * Author URI:  https://github.com/nfreear
+ * Version:     1.0-alpha
+ *
+ * @copyright   © 2017 The Open University (UK).
+ * @author      Nick Freear, 19 January 2017.
+ * @link        https://en-gb.wordpress.org/plugins/lorem-shortcode/
+ */
+
+class Work_In_Progress_Filter_Plugin {
+
+	public function __construct() {
+		add_filter( 'the_content', [ &$this, 'filter_the_content' ]);
+	}
+
+
+	public function filter_the_content( $content ) {
+
+		if ( ! $content ) {
+
+            $page_slug = defined( 'WORK_IN_PROGRESS_SLUG' ) ? WORK_IN_PROGRESS_SLUG : 'work-in-progress';
+
+            $wp_post = get_page_by_path( $page_slug );
+
+			return '<div class="'. $page_slug .'">' . $wp_post->post_content . '</div>';
+		}
+
+		return $content;
+	}
+
+}
+$plugin = new Work_In_Progress_Filter_Plugin();