From 7d238e2ebb769996de7d7f273cc3d71afa4476ff Mon Sep 17 00:00:00 2001
From: Toon Baeyens <toon.baeyens@gmail.com>
Date: Mon, 30 Mar 2020 12:33:28 +0200
Subject: [PATCH] template literals with a style tag, fixes #341

---
 source/index.js          | 5 +++++
 test/template-literal.js | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/source/index.js b/source/index.js
index 53fcc16..73135fe 100644
--- a/source/index.js
+++ b/source/index.js
@@ -134,6 +134,11 @@ const createStyler = (open, close, parent) => {
 
 const createBuilder = (self, _styler, _isEmpty) => {
 	const builder = (...arguments_) => {
+		if (Array.isArray(arguments_[0])) {
+			// Called as a template litteral, e.g. chalk.red`2 + 3 = {bold ${2+3}}`
+			return applyStyle(builder, chalkTag(builder, ...arguments_));
+		}
+
 		// Single argument is hot path, implicit coercion is faster than anything
 		// eslint-disable-next-line no-implicit-coercion
 		return applyStyle(builder, (arguments_.length === 1) ? ('' + arguments_[0]) : arguments_.join(' '));
diff --git a/test/template-literal.js b/test/template-literal.js
index ece1428..dc4b67b 100644
--- a/test/template-literal.js
+++ b/test/template-literal.js
@@ -30,6 +30,14 @@ test('correctly perform template substitutions', t => {
 		instance.bold('Hello,', instance.cyan.inverse(name + '!'), 'This is a') + ' test. ' + instance.green(exclamation + '!'));
 });
 
+test('correctly perform nested template substitutions', t => {
+	const instance = new chalk.Instance({level: 0});
+	const name = 'Sindre';
+	const exclamation = 'Neat';
+	t.is(instance.bold`Hello, {cyan.inverse ${name}!} This is a` + ' test. ' + instance.green`${exclamation}!`,
+		instance.bold('Hello,', instance.cyan.inverse(name + '!'), 'This is a') + ' test. ' + instance.green(exclamation + '!'));
+});
+
 test('correctly parse and evaluate color-convert functions', t => {
 	const instance = new chalk.Instance({level: 3});
 	t.is(instance`{bold.rgb(144,10,178).inverse Hello, {~inverse there!}}`,