[FEATURE] Log CLI version when using --verbose option

bin/ui5.js

@@ -48,7 +48,9 @@ setTimeout(() => {
 	// Explicitly set CLI version as the yargs default might
 	// be wrong in case a local CLI installation is used
 	// Also add CLI location
-	cli.version(`${pkg.version} (from ${__filename})`);
+	const version = `${pkg.version} (from ${__filename})`;
+	require("../lib/cli/version").set(version);
+	cli.version(version);
 
 	// Explicitly set script name to prevent windows from displaying "ui5.js"
 	cli.scriptName("ui5");

lib/cli/middlewares/logger.js

@@ -13,6 +13,8 @@ function init(argv) {
 	}
 	if (argv.verbose) {
 		logger.setLevel("verbose");
+		const version = require("../version").get();
+		logger.getLogger("cli:middlewares:base").verbose(`using @ui5/cli version ${version}`);
 		logger.getLogger("cli:middlewares:base").verbose(`using node version ${process.version}`);
 	}
 	return logger;

lib/cli/version.js

@@ -0,0 +1,11 @@
+let version;
+
+// This module holds the CLI's version information (set via ui5.js) for later retrieval (e.g. from middlewares/logger)
+module.exports = {
+	set: function(v) {
+		version = v;
+	},
+	get: function() {
+		return version;
+	}
+};

test/lib/cli/middlewares/logger.js

@@ -19,3 +19,17 @@ test.serial("retrieves logger middleware if verbose or loglevel are set", (t) =>
 	const loggerInstance = loggerMiddleware.init({verbose: true});
 	t.deepEqual(Object.keys(loggerInstance), Object.keys(logger), "Logger is used as middleware");
 });
+
+const path = require("path");
+const execa = require("execa");
+const pkg = require("../../../../package.json");
+const ui5Cli = path.join(__dirname, "..", "..", "..", "..", "bin", "ui5.js");
+const ui5 = (args, options = {}) => execa(ui5Cli, args, options);
+
+test("ui5 --verbose", async (t) => {
+	// Using "versions" as a command, as the --verbose flag can't be used standalone
+	const {stderr} = await ui5(["versions", "--verbose"]);
+	t.is(stderr,
+		`verb cli:middlewares:base using @ui5/cli version ${pkg.version} (from ${ui5Cli})\n`+
+		`verb cli:middlewares:base using node version ${process.version}`);
+});