add .hasColor() method - fixes #23

index.js

@@ -2,6 +2,7 @@
 var escapeStringRegexp = require('escape-string-regexp');
 var ansiStyles = require('ansi-styles');
 var stripAnsi = require('strip-ansi');
+var hasAnsi = require('has-ansi');
 var supportsColor = require('supports-color');
 var defineProps = Object.defineProperties;
 var chalk = module.exports;
@@ -61,6 +62,7 @@ function init() {
 defineProps(chalk, init());
 
 chalk.styles = ansiStyles;
+chalk.hasColor = hasAnsi;
 chalk.stripColor = stripAnsi;
 chalk.supportsColor = supportsColor;
 

package.json

@@ -42,7 +42,8 @@
   "dependencies": {
     "ansi-styles": "^1.1.0",
     "escape-string-regexp": "^1.0.0",
-    "strip-ansi": "^0.2.0",
+    "has-ansi": "^0.1.0",
+    "strip-ansi": "^0.2.2",
     "supports-color": "^0.2.0"
   },
   "devDependencies": {

readme.md

@@ -109,6 +109,10 @@ console.log(chalk.styles.red);
 console.log(chalk.styles.red.open + 'Hello' + chalk.styles.red.close);
 ```
 
+### chalk.hasColor(string)
+
+Check whether a string [has color](https://github.com/sindresorhus/has-ansi).
+
 ### chalk.stripColor(string)
 
 [Strip color](https://github.com/sindresorhus/strip-ansi) from a string.

test.js

@@ -63,6 +63,13 @@ describe('chalk.styles', function () {
 	});
 });
 
+describe('chalk.hasColor()', function () {
+	it('should detect whether a string has color', function () {
+		assert(chalk.hasColor(chalk.blue('foo')));
+		assert(!chalk.hasColor(chalk.stripColor(chalk.blue('foo'))));
+	});
+});
+
 describe('chalk.stripColor()', function () {
 	it('should strip color from string', function () {
 		assert.equal(chalk.stripColor(chalk.underline.red.bgGreen('foo')), 'foo');