Only use command hooks for the versions that support them.

Author: schlessera

scaffold-package-command.php

@@ -4,8 +4,7 @@
 	return;
 }
 
-WP_CLI::add_hook( 'after_add_command:scaffold', function () {
-
+$registration = function () {
 	$autoload = dirname( __FILE__ ) . '/vendor/autoload.php';
 	if ( file_exists( $autoload ) ) {
 		require_once $autoload;
@@ -14,5 +13,11 @@
 	WP_CLI::add_command( 'scaffold package', array( 'WP_CLI\ScaffoldPackageCommand', 'package' ) );
 	WP_CLI::add_command( 'scaffold package-readme', array( 'WP_CLI\ScaffoldPackageCommand', 'package_readme' ) );
 	WP_CLI::add_command( 'scaffold package-tests', array( 'WP_CLI\ScaffoldPackageCommand', 'package_tests' ) );
+};
 
-} );
+// Only use command hooks in versions that support them.
+if ( version_compare( WP_CLI_VERSION, '1.2.0-alpha', '>' ) ) {
+	WP_CLI::add_hook( 'after_add_command:scaffold', $registration );
+} else {
+	$registration();
+}