Exit with 0 when checked theme is active parent theme (#327)

Author: danielbachhuber

features/theme.feature

@@ -659,3 +659,17 @@ Feature: Manage WordPress themes
       Error: Parameter errors:
        Invalid value specified for 'status' (Filter the output by theme status.)
       """
+
+  Scenario: Parent theme is active when its child is active
+    Given a WP install
+    And I run `wp theme install p2`
+    And I run `wp theme install moina-blog --activate`
+
+    When I run `wp theme is-active moina-blog`
+    Then the return code should be 0
+
+    When I run `wp theme is-active moina`
+    Then the return code should be 0
+
+    When I try `wp theme is-active p2`
+    Then the return code should be 1

src/Theme_Command.php

@@ -731,7 +731,7 @@ public function is_active( $args, $assoc_args = array() ) {
 			WP_CLI::halt( 1 );
 		}
 
-		$this->is_active_theme( $theme ) ? WP_CLI::halt( 0 ) : WP_CLI::halt( 1 );
+		$this->is_active_theme( $theme ) || $this->is_active_parent_theme( $theme ) ? WP_CLI::halt( 0 ) : WP_CLI::halt( 1 );
 	}
 
 	/**