QA: abstract a 3x duplicate closure to a function (#76)

* QA: abstract a 3x duplicate closure to a function

By the time the same code is used three times, it really shouldn't be a closure anymore, but a proper function.

* Turn stand-alone function into a closure

Author: jrfnl

language-command.php

@@ -10,28 +10,22 @@
 	require_once $wpcli_language_autoloader;
 }
 
+$wpcli_language_check_requirements = function() {
+	if ( \WP_CLI\Utils\wp_version_compare( '4.0', '<' ) ) {
+		WP_CLI::error( 'Requires WordPress 4.0 or greater.' );
+	}
+};
+
 WP_CLI::add_command( 'language core', 'Core_Language_Command', array(
-	'before_invoke' => function() {
-		if ( \WP_CLI\Utils\wp_version_compare( '4.0', '<' ) ) {
-			WP_CLI::error( 'Requires WordPress 4.0 or greater.' );
-		}
-	})
+	'before_invoke' => $wpcli_language_check_requirements )
 );
 
 WP_CLI::add_command( 'language plugin', 'Plugin_Language_Command', array(
-		'before_invoke' => function() {
-			if ( \WP_CLI\Utils\wp_version_compare( '4.0', '<' ) ) {
-				WP_CLI::error( 'Requires WordPress 4.0 or greater.' );
-			}
-		})
+		'before_invoke' => $wpcli_language_check_requirements )
 );
 
 WP_CLI::add_command( 'language theme', 'Theme_Language_Command', array(
-		'before_invoke' => function() {
-			if ( \WP_CLI\Utils\wp_version_compare( '4.0', '<' ) ) {
-				WP_CLI::error( 'Requires WordPress 4.0 or greater.' );
-			}
-		})
+		'before_invoke' => $wpcli_language_check_requirements )
 );
 
 WP_CLI::add_hook( 'after_add_command:site', function () {