Now that we have a method to launch new WP-CLI processes, use it to f…

…lush rewrite rules after setting the structure.

Fixes #814

features/rewrite.feature

@@ -5,7 +5,6 @@ Feature: Manage WordPress rewrites
 
   Scenario: Change site permastructs
     When I run `wp rewrite structure /blog/%year%/%monthnum%/%day%/%postname%/ --category-base=section --tag-base=topic`
-    And I run `wp rewrite flush`
 
    When I run `wp option get permalink_structure`
    Then STDOUT should contain:

php/commands/rewrite.php

@@ -85,7 +85,14 @@ public function structure( $args, $assoc_args ) {
 
 		// make sure we detect mod_rewrite if configured in apache_modules in config
 		self::apache_modules();
-		flush_rewrite_rules( isset( $assoc_args['hard'] ) );
+
+		// Launch a new process to flush rewrites because core expects flush
+		// to happen after rewrites are set
+		$new_assoc_args = array();
+		if ( isset( $assoc_args['hard'] ) )
+			$new_assoc_args['hard'] = true;
+		\WP_CLI::launch_wpcli( 'rewrite flush', array(), $new_assoc_args );
+
 		WP_CLI::success( "Rewrite structure set." );
 	}