Add support for description.

Author: alexstine

features/plugin.feature

@@ -683,9 +683,15 @@ Feature: Manage WordPress plugins
       """
       <?php
       // Plugin Name: Test mu-plugin
+      // Description: Test mu-plugin description
       """
 
     When I run `wp plugin list --fields=name,title`
     Then STDOUT should be a table containing rows:
       | name              | title                   |
       | test-mu           | Test mu-plugin       |
+
+    When I run `wp plugin list --fields=name,title,description`
+    Then STDOUT should be a table containing rows:
+      | name    | title             | description                                    |
+      | test    | Test mu-plugin    | Test mu-plugin description                     |

src/Plugin_Command.php

@@ -239,6 +239,11 @@ protected function get_all_items() {
 				$mu_title = $mu_plugin['Title'];
 			}
 
+			$mu_description = '';
+			if ( ! empty( $mu_plugin['Description'] ) ) {
+				$mu_description = $mu_plugin['Description'];
+			}
+
 			$items[ $file ] = array(
 				'name'           => Utils\get_plugin_name( $file ),
 				'status'         => 'must-use',
@@ -248,7 +253,7 @@ protected function get_all_items() {
 				'version'        => $mu_version,
 				'update_id'      => '',
 				'title'          => $mu_title,
-				'description'    => '',
+				'description'    => $mu_description,
 				'file'           => $file,
 			);
 		}