Improve messaging when shuffling salts (#177)

* Fix message in shuffle salts

* Update feature test for shuffle salts

* Fix output conditionals

* Fix feature test in PHP less than 7.0

features/config-shuffle-salts.feature

@@ -111,7 +111,7 @@ Feature: Refresh the salts in the wp-config.php file
     When I run `wp config shuffle-salts AUTH_KEY NONCE_KEY`
     Then STDOUT should contain:
     """
-    Shuffled the salt keys.
+    Shuffled 2 of 2 salts.
     """
     And the wp-config.php file should not contain:
     """
@@ -199,7 +199,7 @@ Feature: Refresh the salts in the wp-config.php file
     When I try `wp config shuffle-salts AUTH_KEY NEW_KEY`
     Then STDOUT should contain:
     """
-    Shuffled the salt keys.
+    Shuffled 1 of 2 salts (1 skipped).
     """
     And STDERR should contain:
     """
@@ -224,7 +224,7 @@ Feature: Refresh the salts in the wp-config.php file
     When I run `wp config shuffle-salts AUTH_KEY NEW_KEY --force`
     Then STDOUT should contain:
     """
-    Shuffled the salt keys.
+    Shuffled 2 of 2 salts.
     """
     And the wp-config.php file should not contain:
     """
@@ -247,7 +247,7 @@ Feature: Refresh the salts in the wp-config.php file
     When I run `wp config shuffle-salts AUTH_KEY NEW_KEY --force`
     Then STDOUT should contain:
     """
-    Shuffled the salt keys.
+    Shuffled 2 of 2 salts.
     """
     And the wp-config.php file should not contain:
     """
@@ -295,7 +295,7 @@ Feature: Refresh the salts in the wp-config.php file
     When I try `wp config shuffle-salts AUTH_KEY NEW_KEY`
     Then STDOUT should contain:
     """
-    Shuffled the salt keys.
+    Shuffled 1 of 2 salts (1 skipped).
     """
     And STDERR should contain:
     """
@@ -320,7 +320,7 @@ Feature: Refresh the salts in the wp-config.php file
     When I try `wp config shuffle-salts AUTH_KEY NEW_KEY --force`
     Then STDOUT should contain:
     """
-    Shuffled the salt keys.
+    Shuffled 1 of 2 salts (1 skipped).
     """
     And STDERR should contain:
     """

src/Config_Command.php

@@ -877,20 +877,26 @@ public function has( $args, $assoc_args ) {
 	 * @when before_wp_load
 	 */
 	public function shuffle_salts( $args, $assoc_args ) {
-
 		$keys  = $args;
 		$force = Utils\get_flag_value( $assoc_args, 'force', false );
 
+		$has_keys = ( ! empty( $keys ) ) ? true : false;
+
 		if ( empty( $keys ) ) {
 			$keys = self::DEFAULT_SALT_CONSTANTS;
 		}
 
+		$successes = 0;
+		$errors    = 0;
+		$skipped   = 0;
+
 		$secret_keys = [];
 
 		try {
 			foreach ( $keys as $key ) {
 				if ( ! $force && ! in_array( $key, self::DEFAULT_SALT_CONSTANTS, true ) ) {
 					WP_CLI::warning( "Could not shuffle the unknown key '{$key}'." );
+					++$skipped;
 					continue;
 				}
 				$secret_keys[ $key ] = trim( self::unique_key() );
@@ -903,6 +909,7 @@ public function shuffle_salts( $args, $assoc_args ) {
 					} else {
 						WP_CLI::warning( "Could not shuffle the unknown key '{$key}'." );
 					}
+					++$skipped;
 				}
 			}
 
@@ -923,14 +930,23 @@ public function shuffle_salts( $args, $assoc_args ) {
 		try {
 			$config_transformer = new WPConfigTransformer( $path );
 			foreach ( $secret_keys as $key => $value ) {
-				$config_transformer->update( 'constant', $key, (string) $value );
+				$is_updated = $config_transformer->update( 'constant', $key, (string) $value );
+				if ( $is_updated ) {
+					++$successes;
+				} else {
+					++$errors;
+				}
 			}
 		} catch ( Exception $exception ) {
 			$wp_config_file_name = basename( $path );
 			WP_CLI::error( "Could not process the '{$wp_config_file_name}' transformation.\nReason: {$exception->getMessage()}" );
 		}
 
-		WP_CLI::success( 'Shuffled the salt keys.' );
+		if ( $has_keys ) {
+			Utils\report_batch_operation_results( 'salt', 'shuffle', count( $keys ), $successes, $errors, $skipped );
+		} else {
+			WP_CLI::success( 'Shuffled the salt keys.' );
+		}
 	}
 
 	/**