Close #54 PR: export classy chalk object to create isolated ctx. Fixes …

…#46, Fixes #46

index.js

@@ -5,7 +5,15 @@ var stripAnsi = require('strip-ansi');
 var hasAnsi = require('has-ansi');
 var supportsColor = require('supports-color');
 var defineProps = Object.defineProperties;
-var chalk = module.exports;
+
+function Chalk(options) {
+	// detect mode if not set manually
+	if (!options || options.enabled === undefined) {
+		this.enabled = supportsColor;
+	} else {
+		this.enabled = options.enabled;
+	}
+}
 
 // use bright blue on Windows as the normal blue color is illegible
 if (process.platform === 'win32') {
@@ -17,6 +25,7 @@ function build(_styles) {
 		return applyStyle.apply(builder, arguments);
 	};
 	builder._styles = _styles;
+	builder.enabled = this.enabled;
 	// __proto__ is used because we must return a function, but there is
 	// no way to create a function with a different prototype.
 	builder.__proto__ = proto;
@@ -31,7 +40,7 @@ var styles = (function () {
 
 		ret[key] = {
 			get: function () {
-				return build(this._styles.concat(key));
+				return build.call(this, this._styles.concat(key));
 			}
 		};
 	});
@@ -53,7 +62,7 @@ function applyStyle() {
 		}
 	}
 
-	if (!chalk.enabled || !str) {
+	if (!this.enabled || !str) {
 		return str;
 	}
 
@@ -78,22 +87,18 @@ function init() {
 	Object.keys(styles).forEach(function (name) {
 		ret[name] = {
 			get: function () {
-				return build([name]);
+				return build.call(this, [name]);
 			}
 		};
 	});
 
 	return ret;
 }
 
-defineProps(chalk, init());
+defineProps(Chalk.prototype, init());
 
-chalk.styles = ansiStyles;
-chalk.hasColor = hasAnsi;
-chalk.stripColor = stripAnsi;
-chalk.supportsColor = supportsColor;
-
-// detect mode if not set manually
-if (chalk.enabled === undefined) {
-	chalk.enabled = chalk.supportsColor;
-}
+module.exports = new Chalk();
+module.exports.styles = ansiStyles;
+module.exports.hasColor = hasAnsi;
+module.exports.stripColor = stripAnsi;
+module.exports.supportsColor = supportsColor;

readme.md

@@ -89,7 +89,10 @@ Multiple arguments will be separated by space.
 
 ### chalk.enabled
 
-Color support is automatically detected, but you can override it.
+Color support is automatically detected, but you can override it by setting the
+`enabled` property or by creating a new instance just for your usage. Changing
+the property should only be done from end-user facing applications as it
+affects all consumers of the default chalk instance
 
 ### chalk.supportsColor
 

test.js

@@ -68,6 +68,14 @@ describe('chalk.enabled', function () {
 	});
 });
 
+describe('chalk.constructor', function () {
+	it('should create a isolated context where colors can be disabled', function () {
+		var ctx = new chalk.constructor({enabled: false});
+		assert.equal(ctx.red('foo'), 'foo');
+		assert.equal(chalk.red('foo'), '\u001b[31mfoo\u001b[39m');
+	});
+});
+
 describe('chalk.styles', function () {
 	it('should expose the styles as ANSI escape codes', function () {
 		assert.equal(chalk.styles.red.open, '\u001b[31m');